{"id":101379,"date":"2026-09-06T18:09:12","date_gmt":"2026-09-06T10:09:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/101379.html"},"modified":"2026-09-06T18:09:12","modified_gmt":"2026-09-06T10:09:12","slug":"mysql-%e4%ba%8b%e5%8a%a1%e5%8e%9f%e7%90%86%e5%8f%8a%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/101379.html","title":{"rendered":"MYSQL \u4e8b\u52a1\u539f\u7406\u53ca\u4f7f\u7528"},"content":{"rendered":"<\/p>\n<h4>MYSQL \u4e8b\u52a1\u539f\u7406\u53ca\u4f7f\u7528<\/h4>\n<ul>\n<li>MySQL \u4e8b\u52a1\u4e0e\u9694\u79bb\u6027\u7b14\u8bb0<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u4e8b\u52a1\u57fa\u7840<\/li>\n<li>\n<ul>\n<li>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u4e8b\u52a1<\/li>\n<li>2. \u4ec0\u4e48\u662f\u4e8b\u52a1<\/li>\n<li>3. \u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u4e8b\u52a1<\/li>\n<li>4. \u4e8b\u52a1\u7684\u7248\u672c\u652f\u6301<\/li>\n<li>5. \u4e8b\u52a1\u63d0\u4ea4\u65b9\u5f0f<\/li>\n<li>6. \u6b63\u5e38\u6f14\u793a &#8211; \u8bc1\u660e\u4e8b\u52a1\u7684\u5f00\u59cb\u4e0e\u56de\u6eda<\/li>\n<li>7. \u975e\u6b63\u5e38\u6f14\u793a1 &#8211; \u8bc1\u660e\u672a commit \u5ba2\u6237\u7aef\u5d29\u6e83 MySQL \u81ea\u52a8\u56de\u6eda<\/li>\n<li>8. \u5355\u6761 SQL \u4e0e\u4e8b\u52a1\u7684\u5173\u7cfb<\/li>\n<li>9. \u7ed3\u8bba<\/li>\n<li>10. \u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u4e8b\u52a1\u7684\u9694\u79bb\u6027<\/li>\n<li>\n<ul>\n<li>1. \u9694\u79bb\u6027\u901a\u4fd7\u7406\u89e3<\/li>\n<li>2. \u5982\u4f55\u7406\u89e3\u9694\u79bb\u6027<\/li>\n<li>3. \u56db\u79cd\u9694\u79bb\u7ea7\u522b<\/li>\n<li>4. \u67e5\u770b\u4e0e\u8bbe\u7f6e\u9694\u79bb\u6027<\/li>\n<li>5. \u8bfb\u672a\u63d0\u4ea4&#xff08;Read Uncommitted&#xff09;\u5b9e\u9a8c<\/li>\n<li>6. \u8bfb\u63d0\u4ea4&#xff08;Read Committed&#xff09;\u5b9e\u9a8c<\/li>\n<li>7. \u53ef\u91cd\u590d\u8bfb&#xff08;Repeatable Read&#xff09;\u5b9e\u9a8c<\/li>\n<li>8. \u4e32\u884c\u5316&#xff08;Serializable&#xff09;\u5b9e\u9a8c<\/li>\n<li>9. \u9694\u79bb\u7ea7\u522b\u603b\u7ed3<\/li>\n<li>10. \u4e00\u81f4\u6027&#xff08;Consistency&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u9694\u79bb\u6027\u7684\u5177\u4f53\u5b9e\u73b0&#xff08;MVCC&#xff09;<\/li>\n<li>\n<ul>\n<li>1. \u5982\u4f55\u7406\u89e3\u9694\u79bb\u60272<\/li>\n<li>2. \u8bfb-\u5199\u4e0e MVCC<\/li>\n<li>3. \u5171\u8bc6<\/li>\n<li>4. \u7406\u89e3 MVCC \u9700\u8981\u77e5\u9053\u4e09\u4e2a\u524d\u63d0\u77e5\u8bc6<\/li>\n<li>5. \u4e09\u4e2a\u8bb0\u5f55\u9690\u85cf\u5217\u5b57\u6bb5<\/li>\n<li>6. undo \u65e5\u5fd7<\/li>\n<li>7. \u6a21\u62df MVCC<\/li>\n<li>8. \u4e00\u4e9b\u601d\u8003<\/li>\n<li>9. Read View<\/li>\n<li>10. \u6574\u4f53\u6d41\u7a0b\u793a\u4f8b<\/li>\n<li>11. RR \u4e0e RC \u7684\u672c\u8d28\u533a\u522b<\/li>\n<li>\n<ul>\n<li>\u5f53\u524d\u8bfb\u548c\u5feb\u7167\u8bfb\u5728 RR \u7ea7\u522b\u4e0b\u7684\u533a\u522b<\/li>\n<li>RR \u4e0e RC \u7684\u672c\u8d28\u533a\u522b&#xff08;\u6b63\u5f0f&#xff09;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>MySQL \u4e8b\u52a1\u4e0e\u9694\u79bb\u6027\u7b14\u8bb0<\/h2>\n<hr \/>\n<h3>\u4e00\u3001\u4e8b\u52a1\u57fa\u7840<\/h3>\n<h4>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u4e8b\u52a1<\/h4>\n<p>\u56e0\u4e3a MySQL \u5b58\u50a8\u6570\u636e\u6ce8\u5b9a\u4e86\u672a\u6765\u80af\u5b9a\u4e0d\u53ea\u4e00\u4e2a\u8fdb\u7a0b\u6765\u5411 MySQL \u8981\u6570\u636e&#xff0c;\u8fd9\u5c31\u51b3\u5b9a\u4e86 mysqld \u670d\u52a1\u4f1a\u6709\u9ad8\u5e76\u53d1\u7684\u573a\u666f&#xff0c;\u800c\u4e8b\u52a1\u7684\u5f15\u51fa\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u79cd\u95ee\u9898\u7684\u3002<\/p>\n<p>\u573a\u666f\u4e3e\u4f8b&#xff1a; \u5047\u8bbe\u6709\u4e00\u4e2a\u4e70\u7968\u7cfb\u7edf&#xff0c;\u73b0\u5728\u8fd8\u6709\u591a\u5c11\u5f20\u7968\u8fd9\u4e2a\u6570\u636e\u662f\u5b58\u653e\u5728\u6570\u636e\u5e93\u91cc\u9762\u7684\u4e00\u5f20\u8868\u91cc\u9762\u7684&#xff0c;\u73b0\u5728\u53ea\u6709\u4e00\u5f20\u7968\u4e86\u3002\u73b0\u5728\u6709\u4e00\u4e2a\u8fdb\u7a0b\u6765\u8bbf\u95ee\u4e70\u7968&#xff0c;\u90a3\u4e48\u5148\u5224\u65ad\u662f\u5426\u6709\u7968\u4e5f\u5c31\u662f\u4e00\u4e2a if \u5224\u65ad&#xff0c;\u4f46\u662f\u5728\u8fd9\u4e2a\u65f6\u5019\u53ef\u80fd\u662f\u65f6\u95f4\u7247\u5207\u6362\u6216\u8005\u8bbf\u95ee\u786c\u4ef6\u5bfc\u81f4\u8fd9\u4e2a\u8fdb\u7a0b\u88ab\u6302\u8d77\u4e86&#xff0c;\u5bfc\u81f4\u6ca1\u6709\u8fdb\u884c\u5bf9\u7968\u7684\u51cf\u64cd\u4f5c\u3002\u5c31\u5728\u540c\u4e00\u65f6\u523b\u53c8\u6709\u4e00\u4e2a\u8fdb\u7a0b\u6765\u4e70\u7968&#xff0c;\u8fdb\u884c\u5224\u65ad\u53d1\u73b0\u8fd8\u6709\u7968&#xff08;\u56e0\u4e3a\u4e0a\u4e00\u4e2a\u8fdb\u7a0b\u8fd8\u6ca1\u6709\u6765\u5f97\u53ca\u51cf&#xff09;&#xff0c;\u8fd9\u4e2a\u8fdb\u7a0b\u5c31\u8fdb\u4e86 if \u6761\u4ef6\u8ba9\u7968\u51cf\u5c11\u4e86\u3002\u5f53\u4e4b\u524d\u90a3\u4e2a\u8fdb\u7a0b\u88ab\u91cd\u65b0\u5524\u8d77\u7684\u65f6\u5019\u4e5f\u4f1a\u5bf9\u7968\u8fdb\u884c\u51cf\u64cd\u4f5c&#xff0c;\u5bfc\u81f4\u4e00\u5f20\u7968\u88ab\u5356\u4e86\u4e24\u6b21\u3002<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898&#xff0c;CURD \u9700\u8981\u6ee1\u8db3\u4ec0\u4e48\u5c5e\u6027&#xff1f;<\/p>\n<li>\u4e70\u7968\u7684\u8fc7\u7a0b\u5f97\u662f\u539f\u5b50\u7684\u5427<\/li>\n<li>\u4e70\u7968\u4e92\u76f8\u5e94\u8be5\u4e0d\u80fd\u5f71\u54cd\u5427<\/li>\n<li>\u4e70\u5b8c\u7968\u5e94\u8be5\u8981\u6c38\u4e45\u6709\u6548\u5427<\/li>\n<li>\u4e70\u524d\u548c\u4e70\u540e\u90fd\u8981\u662f\u786e\u5b9a\u7684\u72b6\u6001\u5427<\/li>\n<h4>2. \u4ec0\u4e48\u662f\u4e8b\u52a1<\/h4>\n<p>\u4e8b\u52a1\u5c31\u662f\u4e00\u7ec4 DML \u8bed\u53e5\u7ec4\u6210&#xff0c;\u8fd9\u4e9b\u8bed\u53e5\u5728\u903b\u8f91\u4e0a\u5b58\u5728\u76f8\u5173\u6027&#xff0c;\u8fd9\u4e00\u7ec4 DML \u8bed\u53e5\u8981\u4e48\u5168\u90e8\u6210\u529f&#xff0c;\u8981\u4e48\u5168\u90e8\u5931\u8d25&#xff0c;\u662f\u4e00\u4e2a\u6574\u4f53\u3002MySQL \u63d0\u4f9b\u4e00\u79cd\u673a\u5236&#xff0c;\u4fdd\u8bc1\u6211\u4eec\u8fbe\u5230\u8fd9\u6837\u7684\u6548\u679c\u3002\u4e8b\u52a1\u8fd8\u89c4\u5b9a\u4e0d\u540c\u7684\u5ba2\u6237\u7aef\u770b\u5230\u7684\u6570\u636e\u662f\u4e0d\u76f8\u540c\u7684\u3002<\/p>\n<p>\u4e8b\u52a1\u5c31\u662f\u8981\u505a\u7684\u6216\u6240\u505a\u7684\u4e8b\u60c5&#xff0c;\u4e3b\u8981\u7528\u4e8e\u5904\u7406\u64cd\u4f5c\u91cf\u5927\u3001\u590d\u6742\u5ea6\u9ad8\u7684\u6570\u636e\u3002\u5047\u8bbe\u4e00\u79cd\u573a\u666f&#xff1a;\u4f60\u6bd5\u4e1a\u4e86&#xff0c;\u5b66\u6821\u7684\u6559\u52a1\u7cfb\u7edf\u540e\u53f0 MySQL \u4e2d\u4e0d\u518d\u9700\u8981\u4f60\u7684\u6570\u636e&#xff0c;\u8981\u5220\u9664\u4f60\u7684\u6240\u6709\u4fe1\u606f&#xff08;\u4e00\u822c\u4e0d\u4f1a:)&#xff09;&#xff0c;\u90a3\u4e48\u8981\u5220\u9664\u4f60\u7684\u57fa\u672c\u4fe1\u606f&#xff08;\u59d3\u540d\u3001\u7535\u8bdd\u3001\u7c4d\u8d2f\u7b49&#xff09;\u7684\u540c\u65f6&#xff0c;\u4e5f\u5220\u9664\u548c\u4f60\u6709\u5173\u7684\u5176\u4ed6\u4fe1\u606f&#xff0c;\u6bd4\u5982\u4f60\u7684\u5404\u79d1\u6210\u7ee9\u3001\u4f60\u5728\u6821\u8868\u73b0\u3001\u751a\u81f3\u4f60\u5728\u8bba\u575b\u53d1\u8fc7\u7684\u6587\u7ae0\u7b49\u3002\u8fd9\u6837\u5c31\u9700\u8981\u591a\u6761 MySQL \u8bed\u53e5\u6784\u6210&#xff0c;\u6240\u6709\u8fd9\u4e9b\u64cd\u4f5c\u5408\u8d77\u6765\u5c31\u6784\u6210\u4e86\u4e00\u4e2a\u4e8b\u52a1\u3002<\/p>\n<p>\u5c31\u662f\u7ad9\u5728 MySQL \u7684\u4e0a\u5c42\u53bb\u770b\u5f85 SQL \u8bed\u53e5&#xff0c;\u7ad9\u5728\u7528\u6237\u7684\u89d2\u5ea6&#xff0c;\u6211\u8981\u5b8c\u6210\u5e94\u7528\u5c42\u7684\u67d0\u4e00\u4e2a\u4e1a\u52a1\u9700\u8981\u4f7f\u7528\u591a\u4e2a SQL \u8bed\u53e5&#xff0c;\u8fd9\u4e2a\u591a\u4e2a SQL \u53eb\u505a\u4e8b\u52a1\u3002<\/p>\n<p>\u6b63\u5982\u4e0a\u9762\u6240\u8bf4&#xff0c;\u4e00\u4e2a MySQL \u6570\u636e\u5e93\u53ef\u4e0d\u6b62\u4f60\u4e00\u4e2a\u4e8b\u52a1\u5728\u8fd0\u884c&#xff0c;\u540c\u4e00\u65f6\u523b\u751a\u81f3\u6709\u5927\u91cf\u7684\u8bf7\u6c42\u88ab\u5305\u88c5\u6210\u4e8b\u52a1&#xff0c;\u5728\u5411 MySQL \u670d\u52a1\u5668\u53d1\u8d77\u4e8b\u52a1\u5904\u7406\u8bf7\u6c42\u3002\u800c\u6bcf\u6761\u4e8b\u52a1\u81f3\u5c11\u4e00\u6761 SQL&#xff0c;\u6700\u591a\u5f88\u591a SQL&#xff0c;\u8fd9\u6837\u5982\u679c\u5927\u5bb6\u90fd\u8bbf\u95ee\u540c\u6837\u7684\u8868\u6570\u636e&#xff0c;\u5728\u4e0d\u52a0\u4fdd\u62a4\u7684\u60c5\u51b5\u5c31\u7edd\u5bf9\u4f1a\u51fa\u73b0\u95ee\u9898\u3002\u751a\u81f3\u56e0\u4e3a\u4e8b\u52a1\u7531\u591a\u6761 SQL \u6784\u6210&#xff0c;\u4e5f\u4f1a\u5b58\u5728\u6267\u884c\u5230\u4e00\u534a\u51fa\u9519\u6216\u8005\u4e0d\u60f3\u518d\u6267\u884c\u7684\u60c5\u51b5&#xff0c;\u90a3\u4e48\u5df2\u7ecf\u6267\u884c\u7684\u600e\u4e48\u529e\u5462&#xff1f;\u6240\u4ee5\u4e00\u4e2a\u5b8c\u6574\u7684\u4e8b\u52a1\u7edd\u5bf9\u4e0d\u662f\u7b80\u5355\u7684 SQL \u96c6\u5408&#xff0c;\u8fd8\u9700\u8981\u6ee1\u8db3\u5982\u4e0b\u56db\u4e2a\u5c5e\u6027&#xff1a;<\/p>\n<ul>\n<li>\u539f\u5b50\u6027&#xff08;Atomicity&#xff09;&#xff1a;\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u64cd\u4f5c&#xff0c;\u8981\u4e48\u5168\u90e8\u5b8c\u6210&#xff0c;\u8981\u4e48\u5168\u90e8\u4e0d\u5b8c\u6210&#xff0c;\u4e0d\u4f1a\u7ed3\u675f\u5728\u4e2d\u95f4\u67d0\u4e2a\u73af\u8282\u3002\u4e8b\u52a1\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u9519\u8bef&#xff0c;\u4f1a\u88ab\u56de\u6eda&#xff08;Rollback&#xff09;\u5230\u4e8b\u52a1\u5f00\u59cb\u524d\u7684\u72b6\u6001&#xff0c;\u5c31\u50cf\u8fd9\u4e2a\u4e8b\u52a1\u4ece\u6765\u6ca1\u6709\u6267\u884c\u8fc7\u4e00\u6837\u3002<\/li>\n<li>\u4e00\u81f4\u6027&#xff08;Consistency&#xff09;&#xff1a;\u5728\u4e8b\u52a1\u5f00\u59cb\u4e4b\u524d\u548c\u4e8b\u52a1\u7ed3\u675f\u4ee5\u540e&#xff0c;\u6570\u636e\u5e93\u7684\u5b8c\u6574\u6027\u6ca1\u6709\u88ab\u7834\u574f\u3002\u8fd9\u8868\u793a\u5199\u5165\u7684\u8d44\u6599\u5fc5\u987b\u5b8c\u5168\u7b26\u5408\u6240\u6709\u7684\u9884\u8bbe\u89c4\u5219&#xff0c;\u5305\u542b\u8d44\u6599\u7684\u7cbe\u786e\u5ea6\u3001\u4e32\u8054\u6027\u4ee5\u53ca\u540e\u7eed\u6570\u636e\u5e93\u53ef\u4ee5\u81ea\u53d1\u6027\u5730\u5b8c\u6210\u9884\u5b9a\u7684\u5de5\u4f5c\u3002\u5c31\u662f\u6211\u4eec\u4ece\u4e00\u79cd\u72b6\u6001\u53d8\u6210\u53e6\u4e00\u79cd\u72b6\u6001&#xff0c;\u5b83\u7684\u7ed3\u679c\u662f\u53ef\u9884\u671f\u7684&#xff0c;\u53ef\u9884\u671f\u5c31\u662f\u548c\u6211\u4eec\u9884\u5148\u7684\u7ed3\u679c\u4e00\u6837\u3002\u6570\u636e\u5e93\u4e2d\u5e76\u6ca1\u6709\u5355\u72ec\u4e3a\u4e00\u81f4\u6027\u505a\u64cd\u4f5c&#xff0c;\u800c\u662f\u4f7f\u7528\u5176\u4ed6\u4e09\u79cd\u5c5e\u6027\u7684\u6ee1\u8db3\u6765\u5b9e\u73b0\u4e00\u81f4\u6027\u3002<\/li>\n<li>\u9694\u79bb\u6027&#xff08;Isolation&#xff09;&#xff1a;\u6570\u636e\u5e93\u5141\u8bb8\u591a\u4e2a\u5e76\u53d1\u4e8b\u52a1\u540c\u65f6\u5bf9\u5176\u6570\u636e\u8fdb\u884c\u8bfb\u5199\u548c\u4fee\u6539\u7684\u80fd\u529b&#xff0c;\u9694\u79bb\u6027\u53ef\u4ee5\u9632\u6b62\u591a\u4e2a\u4e8b\u52a1\u5e76\u53d1\u6267\u884c\u65f6\u7531\u4e8e\u4ea4\u53c9\u6267\u884c\u800c\u5bfc\u81f4\u6570\u636e\u7684\u4e0d\u4e00\u81f4\u3002\u4e8b\u52a1\u9694\u79bb\u5206\u4e3a\u4e0d\u540c\u7ea7\u522b&#xff0c;\u5305\u62ec\u8bfb\u672a\u63d0\u4ea4&#xff08;Read Uncommitted&#xff09;\u3001\u8bfb\u63d0\u4ea4&#xff08;Read Committed&#xff09;\u3001\u53ef\u91cd\u590d\u8bfb&#xff08;Repeatable Read&#xff09;\u548c\u4e32\u884c\u5316&#xff08;Serializable&#xff09;\u3002<\/li>\n<li>\u6301\u4e45\u6027&#xff08;Durability&#xff09;&#xff1a;\u4e8b\u52a1\u5904\u7406\u7ed3\u675f\u540e&#xff0c;\u5bf9\u6570\u636e\u7684\u4fee\u6539\u5c31\u662f\u6c38\u4e45\u7684&#xff0c;\u5373\u4fbf\u7cfb\u7edf\u6545\u969c\u4e5f\u4e0d\u4f1a\u4e22\u5931\u3002<\/li>\n<\/ul>\n<p>\u603b\u800c\u8a00\u4e4b&#xff0c;\u4e8b\u52a1\u5c31\u662f\u4e3a\u4e86\u5b8c\u6210\u67d0\u79cd\u4e1a\u52a1\u5c01\u88c5\u7684\u4e00\u4e32 SQL \u8bed\u53e5\u7ec4\u6210\u7684\u5bf9\u8c61\u3002<\/p>\n<h4>3. \u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u4e8b\u52a1<\/h4>\n<p>\u4e8b\u52a1\u88ab MySQL \u7f16\u5199\u8005\u8bbe\u8ba1\u51fa\u6765&#xff0c;\u672c\u8d28\u662f\u4e3a\u4e86\u5f53\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u65f6\u5019&#xff0c;\u4e8b\u52a1\u80fd\u591f\u7b80\u5316\u6211\u4eec\u7684\u7f16\u7a0b\u6a21\u578b&#xff0c;\u4e0d\u9700\u8981\u6211\u4eec\u53bb\u8003\u8651\u5404\u79cd\u5404\u6837\u7684\u6f5c\u5728\u9519\u8bef\u548c\u5e76\u53d1\u95ee\u9898\u3002\u53ef\u4ee5\u60f3\u4e00\u4e0b\u5f53\u6211\u4eec\u4f7f\u7528\u4e8b\u52a1\u65f6&#xff0c;\u8981\u4e48\u63d0\u4ea4\u8981\u4e48\u56de\u6eda&#xff0c;\u6211\u4eec\u4e0d\u4f1a\u53bb\u8003\u8651\u7f51\u7edc\u5f02\u5e38\u4e86\u3001\u670d\u52a1\u5668\u5b95\u673a\u4e86\u3001\u540c\u65f6\u66f4\u6539\u4e00\u4e2a\u6570\u636e\u600e\u4e48\u529e\u5bf9\u5427&#xff1f;\u56e0\u6b64\u4e8b\u52a1\u672c\u8d28\u4e0a\u662f\u4e3a\u4e86\u5e94\u7528\u5c42\u670d\u52a1\u7684&#xff0c;\u800c\u4e0d\u662f\u4f34\u968f\u7740\u6570\u636e\u5e93\u7cfb\u7edf\u5929\u751f\u5c31\u6709\u7684\u3002<\/p>\n<p>\u5907\u6ce8&#xff1a;\u540e\u9762\u628a MySQL \u4e2d\u7684\u4e00\u884c\u4fe1\u606f\u79f0\u4e3a\u4e00\u884c\u8bb0\u5f55\u3002<\/p>\n<h4>4. \u4e8b\u52a1\u7684\u7248\u672c\u652f\u6301<\/h4>\n<p>\u5728 MySQL \u4e2d\u53ea\u6709\u4f7f\u7528\u4e86 InnoDB \u6570\u636e\u5e93\u5f15\u64ce\u7684\u6570\u636e\u5e93\u6216\u8868\u624d\u652f\u6301\u4e8b\u52a1&#xff0c;MyISAM \u4e0d\u652f\u6301\u3002<\/p>\n<p>\u67e5\u770b\u6570\u636e\u5e93\u5f15\u64ce&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> engines<span class=\"token punctuation\">;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> engines \\\\G<\/p>\n<p>*************************** 1. row ***************************<br \/>\nEngine: InnoDB    &#8212; \u5f15\u64ce\u540d\u79f0<br \/>\nSupport: DEFAULT   &#8212; \u9ed8\u8ba4\u5f15\u64ce<br \/>\nComment: Supports transactions, row-level locking, and foreign keys &#8212; \u63cf\u8ff0<br \/>\nTransactions: YES  &#8212; \u652f\u6301\u4e8b\u52a1<br \/>\nXA: YES<br \/>\nSavepoints: YES    &#8212; \u652f\u6301\u4e8b\u52a1\u4fdd\u5b58\u70b9<\/p>\n<p>*************************** 5. row ***************************<br \/>\nEngine: MyISAM<br \/>\nSupport: YES<br \/>\nComment: MyISAM storage engine<br \/>\nTransactions: NO   &#8212; MyISAM\u4e0d\u652f\u6301\u4e8b\u52a1<br \/>\nXA: NO<br \/>\nSavepoints: NO<\/p>\n<h4>5. \u4e8b\u52a1\u63d0\u4ea4\u65b9\u5f0f<\/h4>\n<p>\u4e8b\u52a1\u7684\u63d0\u4ea4\u65b9\u5f0f\u5e38\u89c1\u7684\u6709\u4e24\u79cd&#xff1a;\u81ea\u52a8\u63d0\u4ea4\u3001\u624b\u52a8\u63d0\u4ea4\u3002<\/p>\n<p>\u67e5\u770b\u4e8b\u52a1\u63d0\u4ea4\u65b9\u5f0f&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.41<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7528 SET \u6765\u6539\u53d8 MySQL \u7684\u81ea\u52a8\u63d0\u4ea4\u6a21\u5f0f&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SET<\/span> AUTOCOMMIT<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">&#8212; \u7981\u6b62\u81ea\u52a8\u63d0\u4ea4<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">OFF<\/span>   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SET<\/span> AUTOCOMMIT<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">&#8212; \u5f00\u542f\u81ea\u52a8\u63d0\u4ea4<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.01<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e3a\u4e86\u4fbf\u4e8e\u6f14\u793a&#xff0c;\u5c06 MySQL \u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u8bbe\u7f6e\u6210\u8bfb\u672a\u63d0\u4ea4\u3002\u5177\u4f53\u64cd\u4f5c\u540e\u9762\u4e13\u95e8\u4f1a\u8bb2&#xff0c;\u73b0\u5728\u4ee5\u4f7f\u7528\u4e3a\u4e3b\u3002<\/p>\n<p> mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">READ<\/span> <span class=\"token keyword\">UNCOMMITTED<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> quit<br \/>\nBye<br \/>\n<span class=\"token comment\">&#8212; \u9700\u8981\u91cd\u542f\u7ec8\u7aef&#xff0c;\u8fdb\u884c\u67e5\u770b<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span>   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">READ<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">UNCOMMITTED<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u60f3\u8981\u4eba\u4e3a\u5730\u521b\u9020\u8fd9\u79cd\u9ad8\u5e76\u53d1\u573a\u666f\u5e76\u4e14\u6709\u73b0\u8c61&#xff0c;\u5982\u679c\u9694\u79bb\u7ea7\u522b\u592a\u9ad8\u5c31\u770b\u4e0d\u5230\u73b0\u8c61\u4e86\u3002<\/p>\n<p>\u521b\u5efa\u6d4b\u8bd5\u8868&#xff1a;<\/p>\n<p><span class=\"token keyword\">create<\/span> <span class=\"token keyword\">table<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token operator\">not<\/span> <span class=\"token keyword\">exists<\/span> account<span class=\"token punctuation\">(<\/span><br \/>\n    id <span class=\"token keyword\">int<\/span> <span class=\"token keyword\">primary<\/span> <span class=\"token keyword\">key<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    name <span class=\"token keyword\">varchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token string\">&#039;&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    blance <span class=\"token keyword\">decimal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token number\">0.0<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">ENGINE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">InnoDB<\/span> <span class=\"token keyword\">DEFAULT<\/span> <span class=\"token keyword\">CHARSET<\/span><span class=\"token operator\">&#061;<\/span>UTF8<span class=\"token punctuation\">;<\/span><\/p>\n<h4>6. \u6b63\u5e38\u6f14\u793a &#8211; \u8bc1\u660e\u4e8b\u52a1\u7684\u5f00\u59cb\u4e0e\u56de\u6eda<\/h4>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u67e5\u770b\u4e8b\u52a1\u662f\u5426\u81ea\u52a8\u63d0\u4ea4\u3002\u6545\u610f\u8bbe\u7f6e\u6210\u81ea\u52a8\u63d0\u4ea4&#xff0c;\u770b\u770b\u8be5\u9009\u9879\u662f\u5426\u5f71\u54cdbegin<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">start<\/span> <span class=\"token keyword\">transaction<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u59cb\u4e00\u4e2a\u4e8b\u52a1&#xff0c;begin\u4e5f\u53ef\u4ee5&#xff0c;\u63a8\u8350begin<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5f53\u6211\u4eec\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\u540e&#xff0c;\u5f80\u540e\u7684\u6240\u6709 SQL \u8bed\u53e5\u90fd\u662f\u540c\u4e00\u4e2a\u4e8b\u52a1\u7684\u3002<\/p>\n<p>\u73b0\u5728\u540c\u65f6\u4f7f\u7528\u4e24\u4e2a\u8fde\u63a5\u540c\u4e00\u4e2a MySQL \u5f97\u5230\u4e24\u4e2a MySQL \u8fdb\u7a0b&#xff0c;\u5e76\u4e14\u4f7f\u7528\u540c\u4e00\u4e2a\u6570\u636e\u5e93&#xff0c;\u4ee5\u4e0b\u7b80\u79f0\u4e24\u4e2a MySQL \u4e3a m1 \u548c m2&#xff0c;\u8ba9\u4e24\u4e2a MySQL \u540c\u65f6\u5f00\u542f\u4e8b\u52a1\u3002<\/p>\n<p>m1 \u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">savepoint<\/span> save1<span class=\"token punctuation\">;<\/span>                          <span class=\"token comment\">&#8212; \u521b\u5efa\u4e00\u4e2a\u4fdd\u5b58\u70b9save1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5f20\u4e09&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">&#8212; \u63d2\u5165\u4e00\u6761\u8bb0\u5f55<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.05<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">savepoint<\/span> save2<span class=\"token punctuation\">;<\/span>                          <span class=\"token comment\">&#8212; \u521b\u5efa\u4e00\u4e2a\u4fdd\u5b58\u70b9save2<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.01<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u674e\u56db&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">&#8212; \u518d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>m2 \u6267\u884c&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53d1\u73b0\u4e24\u6761\u90fd\u63d2\u5165\u4e86&#xff08;\u56e0\u4e3a\u9694\u79bb\u7ea7\u522b\u662f\u8bfb\u672a\u63d0\u4ea4&#xff09;\u3002<\/p>\n<p>\u73b0\u5728\u4e0d\u60f3\u63d2\u5165\u7b2c\u4e8c\u6761\u4e86&#xff0c;\u90a3\u4e48\u53ef\u4ee5\u5728 m1 \u4e2d\u4f7f\u7528&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">rollback<\/span> <span class=\"token keyword\">to<\/span> save2<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">&#8212; \u56de\u6eda\u5230\u4fdd\u5b58\u70b9save2<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.03<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u518d\u5728 m2 \u4e2d\u6267\u884c&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span> <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53d1\u73b0\u7b2c\u4e8c\u6761\u6ca1\u6709\u4e86\u3002\u6240\u4ee5\u8fd9\u4e2a savepoint \u5c31\u7c7b\u4f3c\u4e8e\u5b58\u6863\u70b9\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u90a3\u4e48\u662f\u4e0d\u662f\u5fc5\u987b\u52a0\u4e86 savepoint \u624d\u652f\u6301\u56de\u6eda\u5462&#xff1f;\u7136\u540e\u76f4\u63a5\u63d2\u5165\u4e09\u6761\u6570\u636e\u5e76\u4e14\u4e0d\u6253 savepoint&#xff0c;\u7136\u540e\u76f4\u63a5\u6267\u884c&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">rollback<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u76f4\u63a5rollback&#xff0c;\u56de\u6eda\u5230\u6700\u5f00\u59cb<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\nEmpty <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53d1\u73b0\u4ec0\u4e48\u6570\u636e\u90fd\u6ca1\u6709\u4e86\u3002\u6240\u4ee5\u6211\u4eec\u5728\u5199 SQL \u7684\u65f6\u5019&#xff0c;\u5728\u5173\u952e\u7684\u5730\u65b9\u53ef\u4ee5\u4f7f\u7528 savepoint \u6765\u56de\u6eda&#xff0c;\u4e5f\u53ef\u4ee5\u4f7f\u7528 rollback \u76f4\u63a5\u56de\u5230\u5f00\u59cb\u4e8b\u52a1\u7684\u65f6\u5019\u7684\u72b6\u6001\u3002<\/p>\n<p>\u5f53\u524d\u4e8b\u52a1\u5b8c\u6210\u540e\u53ef\u4ee5\u4f7f\u7528 commit; \u6765\u7ed3\u675f\u5f53\u524d\u4e8b\u52a1\u3002\u6240\u4ee5\u5728\u4e8b\u52a1\u7ed3\u675f\u540e\u518d\u4f7f\u7528 rollback \u5c31\u4e0d\u884c\u4e86&#xff0c;\u5305\u62ec rollback to \u4e5f\u4e0d\u884c\u4e86&#xff0c;\u4e5f\u5c31\u662f\u8bf4\u8fdb\u884c\u63d0\u4ea4\u540e\u6570\u636e\u5c31\u6301\u4e45\u5316\u4fdd\u5b58\u5230\u78c1\u76d8\u4e2d\u4e86\u3002<\/p>\n<p>\u6240\u4ee5\u56de\u6eda\u64cd\u4f5c\u53ea\u80fd\u5728\u4e8b\u52a1\u671f\u95f4\u8fdb\u884c\u56de\u6eda&#xff0c;\u8fd9\u662f\u6b63\u5e38\u60c5\u51b5\u3002<\/p>\n<h4>7. \u975e\u6b63\u5e38\u6f14\u793a1 &#8211; \u8bc1\u660e\u672a commit \u5ba2\u6237\u7aef\u5d29\u6e83 MySQL \u81ea\u52a8\u56de\u6eda<\/h4>\n<p>&#xff08;\u9694\u79bb\u7ea7\u522b\u8bbe\u7f6e\u4e3a\u8bfb\u672a\u63d0\u4ea4&#xff09;<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\nEmpty <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">&#8212; \u5f53\u524d\u8868\u5185\u65e0\u6570\u636e<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4f9d\u65e7\u81ea\u52a8\u63d0\u4ea4<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>                             <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5f20\u4e09&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d2\u5165\u8bb0\u5f55<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">&#8212; \u6570\u636e\u5df2\u7ecf\u5b58\u5728&#xff0c;\u4f46\u6ca1\u6709commit<\/span><\/p>\n<p>\u6b64\u65f6\u540c\u65f6\u67e5\u770b\u7ec8\u7aef m2&#xff1a;<\/p>\n<p>&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<br \/>\n| id | name   | blance |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<br \/>\n|  1 | \u5f20\u4e09   | 100.00 |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> Aborted  <span class=\"token comment\">&#8212; \u5bf9m1\u6267\u884c ctrl &#043; \\\\ \u5f02\u5e38\u7ec8\u6b62MySQL<\/span><\/p>\n<p>m1 \u5d29\u6e83\u524d m2 \u770b\u5230&#xff1a;<\/p>\n<p>&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<br \/>\n| id | name   | blance |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<br \/>\n|  1 | \u5f20\u4e09   | 100.00 |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<br \/>\n1 row in set (0.00 sec)<\/p>\n<p>m1 \u5d29\u6e83\u540e m2 \u67e5\u770b&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u6570\u636e\u81ea\u52a8\u56de\u6eda\u4e86<\/span><br \/>\nEmpty <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f46\u662f\u5982\u679c\u5728\u6267\u884c ctrl &#043; \\\\ \u5f02\u5e38\u7ec8\u6b62 MySQL \u4e4b\u524d commit \u63d0\u4ea4\u4e86\u4e8b\u52a1&#xff0c;\u5373\u4f7f\u5d29\u6e83\u4e5f\u4e0d\u4f1a\u56de\u6eda&#xff0c;\u56e0\u4e3a\u53ea\u8981\u63d0\u4ea4\u4e86\u5c31\u4f1a\u628a\u6570\u636e\u5199\u5230\u78c1\u76d8\u4e2d\u4e86&#xff0c;\u4e5f\u5c31\u6ca1\u6cd5\u56de\u6eda\u4e86\u3002\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709 commit \u4e4b\u524d\u5d29\u6e83\u4f1a\u56de\u6eda&#xff0c;\u8fd9\u6837\u4fdd\u8bc1\u4e86\u539f\u5b50\u6027\u3002\u4f46\u662f\u5982\u679c\u6ca1\u6709\u63d0\u4ea4\u53d1\u751f\u5f02\u5e38\u4e86&#xff0c;\u5373\u4f7f\u6709 savepoint \u4e5f\u4f1a\u56de\u6eda\u5230\u4e8b\u52a1\u5f00\u59cb\u524d\u7684\u6837\u5b50\u3002<\/p>\n<p>\u7ec8\u7aef A&#xff08;\u5148 commit \u518d\u5d29\u6e83&#xff09;&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4f9d\u65e7\u81ea\u52a8\u63d0\u4ea4<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">&#8212; \u5f53\u524d\u8868\u5185\u65e0\u6570\u636e<\/span><br \/>\nEmpty <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>                   <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5f20\u4e09&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d2\u5165\u8bb0\u5f55<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.04<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> Aborted                 <span class=\"token comment\">&#8212; \u5f02\u5e38\u7ec8\u6b62<\/span><\/p>\n<p>\u7ec8\u7aef m2&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span> <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">&#8212; \u6570\u636e\u5b58\u5728\u4e86&#xff0c;\u6240\u4ee5commit\u7684\u4f5c\u7528\u662f\u5c06\u6570\u636e\u6301\u4e45\u5316\u5230MySQL\u4e2d<\/span><\/p>\n<p>\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u4f7f\u7528 show variable like &#039;autocommit&#039; \u53d1\u73b0\u81ea\u52a8\u63d0\u4ea4\u662f\u6253\u5f00\u7684&#xff0c;\u4f46\u662f\u5728\u6211\u4eec\u6ca1\u6709\u4f7f\u7528 commit \u8fdb\u884c\u624b\u52a8\u63d0\u4ea4\u7684\u65f6\u5019\u53d1\u751f\u5d29\u6e83\u4f1a\u5bfc\u81f4\u56de\u6eda\u3002\u80fd\u56de\u6eda\u4ee3\u8868\u8fd9\u4e2a\u6ca1\u6709\u81ea\u52a8\u63d0\u4ea4&#xff0c;\u6211\u4eec\u53ef\u4ee5\u77e5\u9053&#xff1a;\u6211\u4eec\u4f7f\u7528 begin; \u6216\u8005 start transaction; \u624b\u52a8\u5f00\u59cb\u4e8b\u52a1&#xff0c;commit \u624b\u52a8\u63d0\u4ea4\u548c\u81ea\u52a8\u63d0\u4ea4\u662f\u4e24\u7801\u4e8b\u3002<\/p>\n<p>\u4e3a\u4e86\u9a8c\u8bc1 begin \u64cd\u4f5c\u4f1a\u81ea\u52a8\u66f4\u6539\u63d0\u4ea4\u65b9\u5f0f\u3001\u4e0d\u4f1a\u53d7 MySQL \u662f\u5426\u81ea\u52a8\u63d0\u4ea4\u5f71\u54cd&#xff0c;\u628a set autocommit&#061;0; \u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\u7136\u540e\u8fdb\u884c\u4e00\u6837\u7684\u64cd\u4f5c&#xff0c;\u53d1\u73b0\u73b0\u8c61\u8fd8\u662f\u4e00\u6837\u7684&#xff0c;\u5c31\u8bf4\u660e\u4e86\u6211\u4eec\u624b\u52a8\u5f00\u59cb\u4e86\u4e8b\u52a1\u5c31\u8981\u4f7f\u7528 commit \u624b\u52a8\u63d0\u4ea4&#xff0c;\u548c\u662f\u5426\u81ea\u52a8\u63d0\u4ea4\u6ca1\u6709\u4ec0\u4e48\u5173\u7cfb\u3002<\/p>\n<h4>8. \u5355\u6761 SQL \u4e0e\u4e8b\u52a1\u7684\u5173\u7cfb<\/h4>\n<p>\u5b9e\u9a8c\u4e00&#xff08;\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4&#xff09;&#xff1a;<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span> <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> autocommit<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">&#8212; \u5173\u95ed\u81ea\u52a8\u63d0\u4ea4<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u674e\u56db&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d2\u5165\u8bb0\u5f55<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7ec8\u7aef B \u770b\u5230&#xff1a;<\/p>\n<p>&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<br \/>\n| id | name   | blance   |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<br \/>\n|  1 | \u5f20\u4e09   |   100.00 |<br \/>\n|  2 | \u674e\u56db   | 10000.00 |<br \/>\n&#043;&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<br \/>\n2 rows in set (0.00 sec)<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">^<\/span>DBye  <span class=\"token comment\">&#8212; ctrl &#043; \\\\ or ctrl &#043; d&#xff0c;\u7ec8\u6b62\u7ec8\u7aef<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u5d29\u6e83\u524d<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u5d29\u6e83\u540e<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span> <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5b9e\u9a8c\u4e8c&#xff08;\u5f00\u542f\u81ea\u52a8\u63d0\u4ea4&#xff09;&#xff1a;<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">show<\/span> variables <span class=\"token operator\">like<\/span> <span class=\"token string\">&#039;autocommit&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u9ed8\u8ba4\u63d0\u4ea4<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> Variable_name <span class=\"token operator\">|<\/span> <span class=\"token keyword\">Value<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> autocommit    <span class=\"token operator\">|<\/span> <span class=\"token keyword\">ON<\/span>    <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#043;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span> <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u674e\u56db&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.01<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u6570\u636e\u5df2\u7ecf\u63d2\u5165<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> Aborted  <span class=\"token comment\">&#8212; \u5f02\u5e38\u7ec8\u6b62<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u5d29\u6e83\u524d<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u5d29\u6e83\u540e&#xff0c;\u5e76\u4e0d\u5f71\u54cd&#xff0c;\u5df2\u7ecf\u6301\u4e45\u5316&#xff0c;autocommit\u8d77\u4f5c\u7528<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6211\u4eec\u53d1\u73b0\u5f53\u628a\u81ea\u52a8\u63d0\u4ea4\u5173\u95ed\u540e&#xff0c;\u6267\u884c\u7684\u5355\u4e2a SQL \u5728 MySQL \u5d29\u6e83\u540e\u4f1a\u64a4\u56de\u8fd9\u4e2a\u64cd\u4f5c&#xff1b;\u4f46\u662f\u5982\u679c\u628a\u81ea\u52a8\u63d0\u4ea4\u6253\u5f00&#xff0c;\u6211\u4eec\u6267\u884c\u7684\u64cd\u4f5c\u5c31\u4e0d\u4f1a\u64a4\u56de\u3002\u6240\u4ee5\u8fd9\u4e2a\u81ea\u52a8\u63d0\u4ea4\u4f1a\u5f71\u54cd\u5355\u4e2a SQL \u64cd\u4f5c\u3002\u6211\u4eec\u7684\u5355\u4e2a SQL \u64cd\u4f5c\u770b\u4f3c\u6ca1\u6709\u4f7f\u7528\u4e8b\u52a1&#xff0c;\u4f46\u662f\u5b9e\u9645\u4e0a\u5355\u4e2a SQL \u4f1a\u88ab\u5305\u88c5\u6210\u4e8b\u52a1&#xff0c;\u6240\u4ee5\u5bfc\u81f4\u4e86\u5982\u679c\u6211\u4eec\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4&#xff0c;\u90a3\u4e48\u5728\u7cfb\u7edf\u5d29\u6e83\u7684\u65f6\u5019 MySQL \u4f1a\u8ba4\u4e3a\u4f60\u6ca1\u6709\u63d0\u4ea4\u8fd9\u4e2a\u4e8b\u52a1\u5bfc\u81f4\u56de\u6eda&#xff1b;\u4f46\u662f\u5982\u679c\u6211\u4eec\u6253\u5f00\u81ea\u52a8\u63d0\u4ea4&#xff0c;\u90a3\u4e48\u6211\u4eec\u6267\u884c\u7684\u5355\u4e2a SQL \u5c31\u4f1a\u81ea\u52a8\u63d0\u4ea4\u5bfc\u81f4\u4e0d\u4f1a\u56de\u6eda\u4e86\u3002\u4f46\u662f\u5982\u679c\u6211\u4eec\u5728\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\u540e\u518d\u624b\u52a8 commit&#xff0c;\u90a3\u4e48\u5d29\u6e83\u540e\u4e5f\u4e0d\u4f1a\u56de\u6eda\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;\u5f53\u6211\u4eec\u5728 InnoDB \u5f15\u64ce\u4e0b\u9ed8\u8ba4 autocommit \u5f00\u542f\u65f6&#xff0c;\u6bcf\u6761 SQL \u4f1a\u88ab\u5305\u88c5\u4e3a\u72ec\u7acb\u4e8b\u52a1&#xff0c;\u591a\u6761 SQL \u4f9d\u6b21\u6267\u884c\u4e2d\u9014 MySQL \u5d29\u6e83&#xff0c;\u5df2\u6267\u884c\u5b8c\u6210\u5e76\u81ea\u52a8\u63d0\u4ea4\u7684\u6570\u636e\u4fdd\u7559&#xff0c;\u6b63\u5728\u6267\u884c\u7684 SQL \u53d8\u66f4\u56de\u6eda&#xff1b;\u5f53\u6267\u884c SET autocommit&#061;0 \u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\u540e&#xff0c;\u5728\u624b\u52a8 commit \u6216 rollback \u4e4b\u524d\u6267\u884c\u7684\u591a\u6761 DML \u8bed\u53e5\u90fd\u5f52\u5c5e\u4e8e\u540c\u4e00\u4e2a\u4e8b\u52a1&#xff0c;\u82e5\u6b64\u65f6\u53d1\u751f\u6570\u636e\u5e93\u5d29\u6e83&#xff0c;\u4f9d\u9760\u4e8b\u52a1\u539f\u5b50\u6027&#xff0c;\u8fd9\u6279\u672a\u63d0\u4ea4\u7684\u6240\u6709\u4fee\u6539\u4f1a\u6574\u4f53\u5168\u90e8\u64a4\u56de&#xff0c;\u4e0d\u4f1a\u51fa\u73b0\u90e8\u5206\u4fdd\u5b58\u7684\u60c5\u51b5&#xff1b;\u800c\u901a\u8fc7 START TRANSACTION \u6216 BEGIN \u624b\u52a8\u5f00\u542f\u4e8b\u52a1\u6267\u884c\u591a\u6761 SQL \u4e14\u672a\u63d0\u4ea4\u65f6\u5d29\u6e83&#xff0c;\u884c\u4e3a\u548c autocommit \u5173\u95ed\u7684\u573a\u666f\u4e00\u81f4&#xff0c;\u540c\u4e00\u4e8b\u52a1\u5185\u6240\u6709\u53d8\u66f4\u7edf\u4e00\u56de\u6eda\u3002<\/p>\n<h4>9. \u7ed3\u8bba<\/h4>\n<ul>\n<li>\u53ea\u8981\u8f93\u5165 begin \u6216\u8005 start transaction&#xff0c;\u4e8b\u52a1\u4fbf\u5fc5\u987b\u8981\u901a\u8fc7 commit \u63d0\u4ea4\u624d\u4f1a\u6301\u4e45\u5316&#xff0c;\u4e0e\u662f\u5426\u8bbe\u7f6e set autocommit \u65e0\u5173\u3002<\/li>\n<li>\u4e8b\u52a1\u53ef\u4ee5\u624b\u52a8\u56de\u6eda&#xff0c;\u540c\u65f6\u5f53\u64cd\u4f5c\u5f02\u5e38\u65f6 MySQL \u4f1a\u81ea\u52a8\u56de\u6eda\u3002<\/li>\n<li>\u5bf9\u4e8e InnoDB&#xff0c;\u6bcf\u4e00\u6761 SQL \u8bed\u53e5\u90fd\u9ed8\u8ba4\u5c01\u88c5\u6210\u4e8b\u52a1\u81ea\u52a8\u63d0\u4ea4\u3002&#xff08;select \u6709\u7279\u6b8a\u60c5\u51b5&#xff0c;\u56e0\u4e3a MySQL \u6709 MVCC&#xff09;<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u8bbe\u7f6e\u4fdd\u5b58\u70b9&#xff0c;\u4e5f\u53ef\u4ee5\u56de\u6eda&#xff0c;\u53ea\u80fd\u56de\u6eda\u5230\u4e8b\u52a1\u7684\u5f00\u59cb&#xff0c;\u76f4\u63a5\u4f7f\u7528 rollback&#xff08;\u524d\u63d0\u662f\u4e8b\u52a1\u8fd8\u6ca1\u6709\u63d0\u4ea4&#xff09;\u3002<\/li>\n<li>\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u80fd\u770b\u5230\u4e8b\u52a1\u672c\u8eab\u7684\u539f\u5b50\u6027&#xff08;\u56de\u6eda&#xff09;\u3001\u6301\u4e45\u6027&#xff08;commit&#xff09;\u3002<\/li>\n<li>\u90a3\u4e48\u9694\u79bb\u6027&#xff1f;\u4e00\u81f4\u6027&#xff1f;<\/li>\n<\/ul>\n<h4>10. \u603b\u7ed3<\/h4>\n<p>\u4e8b\u52a1\u662f\u6570\u636e\u5e93\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u4e0e\u5b8c\u6574\u6027\u7684\u6838\u5fc3\u673a\u5236&#xff0c;\u5176\u672c\u8d28\u662f\u5c06\u4e00\u7ec4\u64cd\u4f5c\u6346\u7ed1\u4e3a\u4e00\u4e2a\u539f\u5b50\u5355\u5143\u2014\u2014\u8981\u4e48\u5168\u90e8\u6210\u529f\u63d0\u4ea4&#xff0c;\u8981\u4e48\u5168\u90e8\u5931\u8d25\u56de\u6eda&#xff0c;\u7edd\u4e0d\u51fa\u73b0\u90e8\u5206\u751f\u6548\u7684\u60c5\u51b5\u3002\u901a\u8fc7 BEGIN \u6216 START TRANSACTION \u53ef\u4ee5\u663e\u5f0f\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1&#xff0c;\u6b64\u540e\u6267\u884c\u7684\u6240\u6709 DML \u8bed\u53e5&#xff08;\u589e\u5220\u6539&#xff09;\u90fd\u5c5e\u4e8e\u540c\u4e00\u4e2a\u4e8b\u52a1&#xff0c;\u76f4\u5230\u6267\u884c COMMIT \u5c06\u4fee\u6539\u6301\u4e45\u5316\u5230\u78c1\u76d8&#xff0c;\u6216\u6267\u884c ROLLBACK \u64a4\u9500\u81ea\u4e8b\u52a1\u5f00\u59cb\u4ee5\u6765\u7684\u5168\u90e8\u53d8\u66f4\u3002<\/p>\n<p>\u5728\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d&#xff0c;\u53ef\u4ee5\u4f7f\u7528 SAVEPOINT \u521b\u5efa\u5b58\u6863\u70b9&#xff0c;\u5e76\u901a\u8fc7 ROLLBACK TO SAVEPOINT \u56de\u9000\u5230\u6307\u5b9a\u7684\u5b58\u6863\u4f4d\u7f6e&#xff0c;\u5b9e\u73b0\u4e8b\u52a1\u5185\u90e8\u7684\u90e8\u5206\u56de\u6eda&#xff0c;\u800c\u65e0\u9700\u653e\u5f03\u6574\u4e2a\u4e8b\u52a1\u3002\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f&#xff0c;\u4e00\u65e6\u6267\u884c\u4e86 COMMIT&#xff0c;\u6240\u6709\u4fee\u6539\u4fbf\u6c38\u4e45\u751f\u6548&#xff0c;\u6b64\u540e\u65e0\u8bba\u662f ROLLBACK \u8fd8\u662f ROLLBACK TO SAVEPOINT \u90fd\u65e0\u6cd5\u518d\u64a4\u9500\u5df2\u63d0\u4ea4\u7684\u6570\u636e\u3002<\/p>\n<p>MySQL \u4e2d\u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\u662f autocommit \u81ea\u52a8\u63d0\u4ea4\u6a21\u5f0f&#xff0c;\u5b83\u51b3\u5b9a\u4e86 DML \u8bed\u53e5\u5982\u4f55\u88ab\u5305\u88c5\u6210\u4e8b\u52a1\u4ee5\u53ca\u4f55\u65f6\u63d0\u4ea4&#xff1a;<\/p>\n<ul>\n<li>\u5f53 autocommit &#061; ON \u65f6&#xff08;MySQL \u9ed8\u8ba4\u8bbe\u7f6e&#xff09;&#xff0c;\u6bcf\u4e00\u6761 SQL \u8bed\u53e5\u90fd\u4f1a\u88ab\u5305\u88c5\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u9690\u5f0f\u4e8b\u52a1&#xff0c;\u6267\u884c\u6210\u529f\u540e\u7acb\u5373\u81ea\u52a8\u63d0\u4ea4\u5e76\u6301\u4e45\u5316\u5230\u78c1\u76d8&#xff0c;\u65e0\u9700\u624b\u52a8\u5e72\u9884&#xff1b;\u8fd9\u610f\u5473\u7740\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5373\u4f7f\u6ca1\u6709\u663e\u5f0f\u4f7f\u7528 BEGIN \u5f00\u542f\u4e8b\u52a1&#xff0c;\u5355\u6761\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u4e5f\u5904\u4e8e\u4e8b\u52a1\u7684\u4fdd\u62a4\u4e4b\u4e0b\u2014\u2014\u6267\u884c\u6210\u529f\u5219\u6301\u4e45\u4fdd\u5b58&#xff0c;\u6267\u884c\u5931\u8d25\u5219\u81ea\u52a8\u56de\u6eda\u3002<\/li>\n<li>\u5f53 autocommit &#061; OFF \u65f6&#xff0c;\u5173\u95ed\u4e86\u81ea\u52a8\u63d0\u4ea4\u529f\u80fd&#xff0c;\u4ece\u8bbe\u7f6e\u751f\u6548\u7684\u90a3\u4e00\u523b\u8d77&#xff0c;\u540e\u7eed\u6267\u884c\u7684\u6240\u6709 DML \u8bed\u53e5\u90fd\u5c06\u5f52\u5c5e\u4e8e\u540c\u4e00\u4e2a\u9690\u5f0f\u4e8b\u52a1&#xff0c;\u76f4\u5230\u624b\u52a8\u6267\u884c COMMIT \u624d\u4f1a\u5c06\u8fd9\u6279\u4fee\u6539\u7edf\u4e00\u6301\u4e45\u5316\u5230\u78c1\u76d8&#xff0c;\u6216\u6267\u884c ROLLBACK \u7edf\u4e00\u64a4\u9500\u6240\u6709\u4fee\u6539&#xff1b;\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b&#xff0c;\u5982\u679c\u6267\u884c\u4e86\u591a\u6761\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u540e\u8fd8\u672a\u63d0\u4ea4&#xff0c;\u6b64\u65f6\u53d1\u751f\u5ba2\u6237\u7aef\u5d29\u6e83\u6216 MySQL \u670d\u52a1\u5668\u5f02\u5e38\u7ec8\u6b62&#xff0c;\u90a3\u4e48\u6240\u6709\u8fd9\u4e9b\u672a\u63d0\u4ea4\u7684\u4fee\u6539\u4f1a\u5728\u5d29\u6e83\u6062\u590d\u540e\u5168\u90e8\u81ea\u52a8\u56de\u6eda&#xff0c;\u4e0d\u4f1a\u51fa\u73b0\u90e8\u5206\u4fdd\u5b58\u7684\u60c5\u51b5&#xff0c;\u8fd9\u5145\u5206\u4f53\u73b0\u4e86\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e8c\u3001\u4e8b\u52a1\u7684\u9694\u79bb\u6027<\/h3>\n<h4>1. \u9694\u79bb\u6027\u901a\u4fd7\u7406\u89e3<\/h4>\n<p>\u4e8b\u52a1\u9694\u79bb\u6027\u53ef\u4ee5\u8fd9\u6837\u901a\u4fd7\u7406\u89e3&#xff1a;\u5f53\u4e24\u4e2a\u4e8b\u52a1\u540c\u65f6\u64cd\u4f5c\u540c\u4e00\u5f20\u8868&#xff0c;\u4e00\u4e2a\u8d1f\u8d23\u67e5\u627e&#xff0c;\u4e00\u4e2a\u8d1f\u8d23\u63d2\u5165&#xff0c;\u6570\u636e\u5e93\u5e95\u5c42\u4f1a\u6309\u7167\u5b83\u4eec\u5b9e\u9645\u5230\u8fbe\u7684\u65f6\u95f4\u987a\u5e8f\u4f9d\u6b21\u5904\u7406&#xff0c;\u4f46\u6bcf\u4e2a\u4e8b\u52a1\u4ece\u542f\u52a8\u7684\u90a3\u4e00\u523b\u8d77\u5c31\u62e5\u6709\u4e86\u5c5e\u4e8e\u81ea\u5df1\u7684\u72ec\u7acb\u6570\u636e\u5feb\u7167&#xff0c;\u5728\u6574\u4e2a\u4e8b\u52a1\u6267\u884c\u671f\u95f4\u5b83\u59cb\u7ec8\u8bfb\u53d6\u8fd9\u4efd\u5feb\u7167\u4e2d\u7684\u6570\u636e&#xff0c;\u5f7c\u6b64\u4e4b\u95f4\u4e92\u4e0d\u5e72\u6270\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50&#xff1a;\u5982\u679c\u67e5\u627e\u4e8b\u52a1\u5148\u5230\u8fbe\u5e76\u542f\u52a8&#xff0c;\u90a3\u4e48\u5b83\u4f1a\u7acb\u5373\u62cd\u4e0b\u5f53\u524d\u8868\u7684\u4e00\u4efd\u5feb\u7167&#xff0c;\u8fd9\u4efd\u5feb\u7167\u91cc\u8bb0\u5f55\u7684\u662f\u63d2\u5165\u4e8b\u52a1\u5f00\u59cb\u4e4b\u524d\u7684\u6570\u636e\u72b6\u6001\u3002\u968f\u540e\u63d2\u5165\u4e8b\u52a1\u5f00\u59cb\u6267\u884c&#xff0c;\u5411\u8868\u4e2d\u6dfb\u52a0\u65b0\u6570\u636e\u5e76\u6700\u7ec8\u63d0\u4ea4&#xff0c;\u6570\u636e\u867d\u7136\u5df2\u7ecf\u6301\u4e45\u5316\u5230\u78c1\u76d8&#xff0c;\u4f46\u67e5\u627e\u4e8b\u52a1\u7531\u4e8e\u4ecd\u5728\u8fd0\u884c\u4e2d&#xff0c;\u5b83\u5e76\u4e0d\u4f1a\u53bb\u8bfb\u53d6\u78c1\u76d8\u4e0a\u6700\u65b0\u7684\u6570\u636e&#xff0c;\u800c\u662f\u7ee7\u7eed\u8bfb\u53d6\u81ea\u5df1\u542f\u52a8\u65f6\u7684\u90a3\u4efd\u65e7\u5feb\u7167&#xff0c;\u6240\u4ee5\u5b83\u770b\u5230\u7684\u4f9d\u7136\u662f\u63d2\u5165\u4e4b\u524d\u7684\u8868\u72b6\u6001&#xff0c;\u5373\u4f7f\u5b83\u6267\u884c\u4e86\u5f88\u957f\u65f6\u95f4\u751a\u81f3\u63d2\u5165\u4e8b\u52a1\u65e9\u5df2\u5b8c\u6210&#xff0c;\u8fd9\u4e2a\u7ed3\u679c\u4e5f\u4e0d\u4f1a\u6539\u53d8\u3002<\/p>\n<p>\u53cd\u8fc7\u6765&#xff0c;\u5982\u679c\u63d2\u5165\u4e8b\u52a1\u5148\u5230\u8fbe\u4f46\u8fd8\u6ca1\u6709\u63d0\u4ea4&#xff0c;\u67e5\u627e\u4e8b\u52a1\u8fd9\u65f6\u624d\u542f\u52a8&#xff0c;\u90a3\u4e48\u67e5\u627e\u4e8b\u52a1\u62cd\u4e0b\u7684\u5feb\u7167\u4e2d\u4f9d\u7136\u4e0d\u5305\u542b\u90a3\u4e9b\u5c1a\u672a\u63d0\u4ea4\u7684\u6570\u636e&#xff0c;\u6240\u4ee5\u770b\u5230\u7684\u4ecd\u7136\u662f\u63d2\u5165\u524d\u7684\u8868&#xff1b;\u53ea\u6709\u5f53\u63d2\u5165\u4e8b\u52a1\u5148\u5b8c\u6210\u4e86\u63d0\u4ea4&#xff0c;\u67e5\u627e\u4e8b\u52a1\u5728\u63d2\u5165\u63d0\u4ea4\u4e4b\u540e\u624d\u542f\u52a8&#xff0c;\u5b83\u7684\u5feb\u7167\u91cc\u624d\u4f1a\u5305\u542b\u65b0\u63d2\u5165\u7684\u6570\u636e&#xff0c;\u6b64\u65f6\u67e5\u627e\u624d\u80fd\u770b\u5230\u63d2\u5165\u540e\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u7b80\u5355\u6765\u8bf4&#xff1a;\u67e5\u627e\u90a3\u4e00\u523b\u8868\u4e2d\u5df2\u63d0\u4ea4\u7684\u6570\u636e\u662f\u4ec0\u4e48\u6837\u5b50&#xff0c;\u67e5\u627e\u4e8b\u52a1\u770b\u5230\u7684\u5c31\u662f\u4ec0\u4e48\u6837\u5b50&#xff1b;\u672a\u63d0\u4ea4\u7684\u6570\u636e\u65e0\u8bba\u63d2\u5165\u4e8b\u52a1\u6267\u884c\u4e86\u591a\u4e45&#xff0c;\u5bf9\u5176\u4ed6\u4e8b\u52a1\u59cb\u7ec8\u4e0d\u53ef\u89c1\u3002<\/p>\n<h4>2. \u5982\u4f55\u7406\u89e3\u9694\u79bb\u6027<\/h4>\n<p>MySQL \u670d\u52a1\u53ef\u80fd\u4f1a\u540c\u65f6\u88ab\u591a\u4e2a\u5ba2\u6237\u7aef\u8fdb\u7a0b&#xff08;\u7ebf\u7a0b&#xff09;\u8bbf\u95ee&#xff0c;\u8bbf\u95ee\u7684\u65b9\u5f0f\u4ee5\u4e8b\u52a1\u65b9\u5f0f\u8fdb\u884c\u3002\u4e00\u4e2a\u4e8b\u52a1\u53ef\u80fd\u7531\u591a\u6761 SQL \u6784\u6210&#xff0c;\u4e5f\u5c31\u610f\u5473\u7740\u4efb\u4f55\u4e00\u4e2a\u4e8b\u52a1\u90fd\u6709\u6267\u884c\u524d\u3001\u6267\u884c\u4e2d\u3001\u6267\u884c\u540e\u7684\u9636\u6bb5\u3002\u800c\u6240\u8c13\u7684\u539f\u5b50\u6027&#xff0c;\u5176\u5b9e\u5c31\u662f\u8ba9\u7528\u6237\u5c42\u8981\u4e48\u770b\u5230\u6267\u884c\u524d\u8981\u4e48\u770b\u5230\u6267\u884c\u540e&#xff0c;\u6267\u884c\u4e2d\u51fa\u73b0\u95ee\u9898\u53ef\u4ee5\u968f\u65f6\u56de\u6eda\u3002\u6240\u4ee5\u5355\u4e2a\u4e8b\u52a1\u5bf9\u7528\u6237\u8868\u73b0\u51fa\u6765\u7684\u7279\u6027\u5c31\u662f\u539f\u5b50\u6027\u3002<\/p>\n<p>\u4f46\u6bd5\u7adf\u6240\u6709\u4e8b\u52a1\u90fd\u8981\u6709\u4e2a\u6267\u884c\u8fc7\u7a0b&#xff0c;\u90a3\u4e48\u5728\u591a\u4e2a\u4e8b\u52a1\u5404\u81ea\u6267\u884c\u591a\u4e2a SQL \u7684\u65f6\u5019&#xff0c;\u5c31\u8fd8\u662f\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e92\u76f8\u5f71\u54cd\u7684\u60c5\u51b5\u3002\u6bd4\u5982\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u5f20\u8868&#xff0c;\u751a\u81f3\u540c\u4e00\u884c\u6570\u636e\u3002<\/p>\n<p>\u5c31\u5982\u540c\u4f60\u5988\u5988\u7ed9\u4f60\u8bf4&#xff1a;\u4f60\u8981\u4e48\u522b\u5b66&#xff0c;\u8981\u5b66\u5c31\u5b66\u5230\u6700\u597d\u3002\u81f3\u4e8e\u4f60\u600e\u4e48\u5b66\u3001\u4e2d\u95f4\u6709\u4ec0\u4e48\u56f0\u96be&#xff0c;\u4f60\u5988\u5988\u4e0d\u5173\u5fc3\u3002\u90a3\u4e48\u4f60\u7684\u5b66\u4e60\u5bf9\u4f60\u5988\u5988\u6765\u8bb2\u5c31\u662f\u539f\u5b50\u7684\u3002\u90a3\u4e48\u4f60\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u5f88\u5bb9\u6613\u53d7\u522b\u4eba\u5e72\u6270&#xff0c;\u6b64\u65f6\u5c31\u9700\u8981\u5c06\u4f60\u7684\u5b66\u4e60\u9694\u79bb\u5f00&#xff0c;\u4fdd\u8bc1\u4f60\u7684\u5b66\u4e60\u73af\u5883\u662f\u5065\u5eb7\u7684\u3002<\/p>\n<p>\u6570\u636e\u5e93\u4e2d\u4e3a\u4e86\u4fdd\u8bc1\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u5c3d\u91cf\u4e0d\u53d7\u5e72\u6270&#xff0c;\u5c31\u6709\u4e86\u4e00\u4e2a\u91cd\u8981\u7279\u5f81&#xff1a;\u9694\u79bb\u6027\u3002\u6570\u636e\u5e93\u4e2d\u5141\u8bb8\u4e8b\u52a1\u53d7\u4e0d\u540c\u7a0b\u5ea6\u7684\u5e72\u6270&#xff0c;\u5c31\u6709\u4e86\u4e00\u79cd\u91cd\u8981\u7279\u5f81&#xff1a;\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n<h4>3. \u56db\u79cd\u9694\u79bb\u7ea7\u522b<\/h4>\n<table>\n<tr>\u9694\u79bb\u7ea7\u522b\u8bf4\u660e\u95ee\u9898<\/tr>\n<tbody>\n<tr>\n<td>\u8bfb\u672a\u63d0\u4ea4&#xff08;Read Uncommitted&#xff09;<\/td>\n<td>\u6240\u6709\u4e8b\u52a1\u90fd\u53ef\u4ee5\u770b\u5230\u5176\u4ed6\u4e8b\u52a1\u6ca1\u6709\u63d0\u4ea4\u7684\u6267\u884c\u7ed3\u679c\u3002\u76f8\u5f53\u4e8e\u6ca1\u6709\u4efb\u4f55\u9694\u79bb\u6027<\/td>\n<td>\u810f\u8bfb\u3001\u5e7b\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb<\/td>\n<\/tr>\n<tr>\n<td>\u8bfb\u63d0\u4ea4&#xff08;Read Committed&#xff09;<\/td>\n<td>\u5927\u591a\u6570\u6570\u636e\u5e93\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b&#xff08;\u4e0d\u662f MySQL \u9ed8\u8ba4\u7684&#xff09;\u3002\u4e00\u4e2a\u4e8b\u52a1\u53ea\u80fd\u770b\u5230\u5176\u4ed6\u5df2\u7ecf\u63d0\u4ea4\u7684\u4e8b\u52a1\u6240\u505a\u7684\u6539\u53d8<\/td>\n<td>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/td>\n<\/tr>\n<tr>\n<td>\u53ef\u91cd\u590d\u8bfb&#xff08;Repeatable Read&#xff09;<\/td>\n<td>MySQL \u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u3002\u786e\u4fdd\u540c\u4e00\u4e2a\u4e8b\u52a1\u5728\u6267\u884c\u4e2d\u591a\u6b21\u8bfb\u53d6\u64cd\u4f5c\u6570\u636e\u65f6\u4f1a\u770b\u5230\u540c\u6837\u7684\u6570\u636e\u884c<\/td>\n<td>\u5e7b\u8bfb&#xff08;MySQL \u901a\u8fc7 Next-Key \u9501\u89e3\u51b3\u4e86&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e32\u884c\u5316&#xff08;Serializable&#xff09;<\/td>\n<td>\u4e8b\u52a1\u7684\u6700\u9ad8\u9694\u79bb\u7ea7\u522b&#xff0c;\u901a\u8fc7\u5f3a\u5236\u4e8b\u52a1\u6392\u5e8f\u4f7f\u4e4b\u4e0d\u53ef\u80fd\u76f8\u4e92\u51b2\u7a81&#xff0c;\u4ece\u800c\u89e3\u51b3\u5e7b\u8bfb\u3002\u5728\u6bcf\u4e2a\u8bfb\u7684\u6570\u636e\u884c\u4e0a\u9762\u52a0\u4e0a\u5171\u4eab\u9501<\/td>\n<td>\u53ef\u80fd\u5bfc\u81f4\u8d85\u65f6\u548c\u9501\u7ade\u4e89&#xff0c;\u6548\u7387\u6781\u4f4e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u8bfb\u672a\u63d0\u4ea4&#xff1a;\u4e24\u4e2a\u4e8b\u52a1\u5e76\u53d1\u6267\u884c&#xff0c;\u8fd9\u8fb9\u6709\u4ec0\u4e48\u64cd\u4f5c\u53e6\u5916\u4e00\u8fb9\u9a6c\u4e0a\u5c31\u80fd\u770b\u5230&#xff0c;\u5373\u4f7f\u6ca1\u6709 commit\u3002\u5b9e\u9645\u751f\u4ea7\u4e2d\u4e0d\u53ef\u80fd\u4f7f\u7528\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u3002<\/li>\n<li>\u8bfb\u63d0\u4ea4&#xff1a;\u4e24\u4e2a\u4e8b\u52a1\u53ea\u6709\u4e00\u8fb9\u63d0\u4ea4\u4e86\u4e8b\u52a1\u53e6\u5916\u4e00\u8fb9\u624d\u80fd\u770b\u5230\u3002<\/li>\n<li>\u53ef\u91cd\u590d\u8bfb&#xff1a;\u4e00\u8fb9\u63d0\u4ea4\u4e8b\u52a1\u4e86\u4f46\u662f\u53e6\u4e00\u4e2a\u4e8b\u52a1\u770b\u4e0d\u5230&#xff0c;\u53ea\u6709\u5f53\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u63d0\u4ea4\u4e86\u4e8b\u52a1\u624d\u80fd\u770b\u5230\u3002<\/li>\n<li>\u4e32\u884c\u5316&#xff1a;\u4e00\u4e2a\u4e00\u4e2a\u4e8b\u52a1\u5730\u6267\u884c\u3002\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u592a\u6781\u7aef&#xff0c;\u5b9e\u9645\u751f\u4ea7\u57fa\u672c\u4e0d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<p>\u6211\u4eec\u6ce8\u610f\u5230\u6240\u6709\u7684\u7ea7\u522b\u90fd\u662f\u548c\u8bfb\u6709\u5173\u7684\u3002\u5176\u5b9e\u4f1a\u5728\u9ad8\u5e76\u53d1\u51fa\u73b0\u60c5\u51b5\u7684\u53ea\u6709\u8bfb\u5199\u7684\u60c5\u51b5&#xff1a;\u8bfb\u8bfb\u4e24\u4e2a\u90fd\u4e0d\u505a\u4fee\u6539\u81ea\u7136\u600e\u4e48\u6765\u90fd\u884c&#xff1b;\u5199\u5199\u5c31\u4e0d\u80fd\u5e76\u884c\u53ea\u80fd\u4e32\u884c&#xff1b;\u53ea\u6709\u8bfb\u5199\u8fd9\u79cd\u60c5\u51b5\u6700\u5e38\u89c1\u53c8\u9700\u8981\u5e76\u884c\u3002<\/p>\n<h4>4. \u67e5\u770b\u4e0e\u8bbe\u7f6e\u9694\u79bb\u6027<\/h4>\n<p>\u67e5\u770b&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">&#8212; \u67e5\u770b\u5168\u5c40\u9694\u79bb\u7ea7\u522b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span>       <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u67e5\u770b\u4f1a\u8bdd(\u5f53\u524d)\u9694\u79bb\u7ea7\u522b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span>        <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">&#8212; \u9ed8\u8ba4\u540c\u4e0a&#xff0c;\u90fd\u662f\u67e5\u770b\u5f53\u524d\u4f1a\u8bdd\u7684\u9694\u79bb\u7ea7\u522b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span>  <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8bbe\u7f6e&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u8bbe\u7f6e\u5f53\u524d\u4f1a\u8bdd or \u5168\u5c40\u9694\u79bb\u7ea7\u522b\u8bed\u6cd5<\/span><br \/>\n<span class=\"token keyword\">SET<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">SESSION<\/span> <span class=\"token operator\">|<\/span> <span class=\"token keyword\">GLOBAL<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">TRANSACTION<\/span> <span class=\"token keyword\">ISOLATION<\/span> <span class=\"token keyword\">LEVEL<\/span><br \/>\n{<span class=\"token keyword\">READ<\/span> <span class=\"token keyword\">UNCOMMITTED<\/span> <span class=\"token operator\">|<\/span> <span class=\"token keyword\">READ<\/span> <span class=\"token keyword\">COMMITTED<\/span> <span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span> <span class=\"token keyword\">READ<\/span> <span class=\"token operator\">|<\/span> <span class=\"token keyword\">SERIALIZABLE<\/span>}<\/p>\n<p>\u8bbe\u7f6e\u5f53\u524d\u4f1a\u8bdd\u9694\u79bb\u6027&#xff0c;\u53e6\u8d77\u4e00\u4e2a\u4f1a\u8bdd\u770b\u4e0d\u5230&#xff0c;\u53ea\u5f71\u54cd\u5f53\u524d\u4f1a\u8bdd&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">session<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">serializable<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4e32\u884c\u5316<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">&#8212; \u5168\u5c40\u9694\u79bb\u6027\u8fd8\u662fRR<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span>       <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4f1a\u8bdd\u9694\u79bb\u6027\u6210\u4e3a\u4e32\u884c\u5316<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">SERIALIZABLE<\/span>           <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">&#8212; \u540c\u4e0a<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">SERIALIZABLE<\/span>   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><\/p>\n<p>\u8bbe\u7f6e\u5168\u5c40\u9694\u79bb\u6027&#xff0c;\u53e6\u8d77\u4e00\u4e2a\u4f1a\u8bdd\u4f1a\u88ab\u5f71\u54cd&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">READ<\/span> <span class=\"token keyword\">UNCOMMITTED<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;global.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">READ<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">UNCOMMITTED<\/span>      <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;session.tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">READ<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">UNCOMMITTED<\/span>       <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5982\u679c\u6ca1\u6709\u73b0\u8c61&#xff0c;\u5173\u95ed MySQL \u5ba2\u6237\u7aef\u91cd\u65b0\u8fde\u63a5\u3002<\/p>\n<p>MySQL \u7684\u9694\u79bb\u7ea7\u522b\u5206\u4e3a\u5168\u5c40\u548c\u4f1a\u8bdd\u4e24\u4e2a\u5c42\u6b21&#xff0c;\u4e24\u8005\u4e92\u4e0d\u5f71\u54cd&#xff1a;\u4fee\u6539\u5168\u5c40\u53ea\u5bf9\u65b0\u8fde\u63a5\u751f\u6548&#xff0c;\u4e0d\u5f71\u54cd\u5df2\u6709\u4f1a\u8bdd&#xff1b;\u4fee\u6539\u4f1a\u8bdd\u53ea\u5f71\u54cd\u5f53\u524d\u4f1a\u8bdd&#xff0c;\u4e0d\u5f71\u54cd\u5168\u5c40\u8bbe\u7f6e\u3002\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\u9075\u5faa&#034;\u5c31\u8fd1\u539f\u5219&#034;\u2014\u2014\u5982\u679c\u5f53\u524d\u4f1a\u8bdd\u663e\u5f0f\u8bbe\u7f6e\u4e86\u9694\u79bb\u7ea7\u522b&#xff0c;\u5219\u4f18\u5148\u4f7f\u7528\u4f1a\u8bdd\u7ea7\u522b&#xff1b;\u5426\u5219\u4f7f\u7528\u5168\u5c40\u7ea7\u522b\u4f5c\u4e3a\u9ed8\u8ba4\u503c\u3002<\/p>\n<p>\u901a\u8fc7 SET GLOBAL \u4fee\u6539\u5168\u5c40\u9694\u79bb\u7ea7\u522b\u540e\u7acb\u5373\u751f\u6548&#xff0c;\u9000\u51fa\u91cd\u65b0\u767b\u5f55\u521b\u5efa\u7684\u65b0\u8fde\u63a5\u4f1a\u4f7f\u7528\u4fee\u6539\u540e\u7684\u503c&#xff0c;\u56e0\u6b64\u89c2\u5bdf\u5230\u4fee\u6539\u540e\u91cd\u767b\u5f55\u4f9d\u7136\u751f\u6548\u662f\u6b63\u786e\u7684&#xff0c;\u56e0\u4e3a\u8fd9\u4e2a\u503c\u4fdd\u5b58\u5728\u670d\u52a1\u5668\u7684\u8fd0\u884c\u5185\u5b58\u4e2d&#xff0c;\u4e0d\u4f1a\u56e0\u5ba2\u6237\u7aef\u65ad\u5f00\u800c\u4e22\u5931&#xff1b;\u53ea\u6709\u5f53 MySQL \u670d\u52a1\u91cd\u542f\u65f6&#xff0c;\u5185\u5b58\u4e2d\u7684\u503c\u4f1a\u88ab\u6e05\u7a7a&#xff0c;\u91cd\u65b0\u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u8bbe\u7f6e&#xff0c;\u6b64\u65f6\u4fee\u6539\u624d\u4f1a\u5931\u6548\u3002\u5982\u679c\u9700\u8981\u91cd\u542f\u540e\u4f9d\u7136\u4fdd\u7559&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u914d\u7f6e\u6587\u4ef6&#xff08;\u5982 my.cnf \u6216 my.ini&#xff09;\u6c38\u4e45\u751f\u6548&#xff0c;\u6216\u5728 MySQL 8.0 \u4ee5\u4e0a\u4f7f\u7528 SET PERSIST \u6301\u4e45\u5316\u8bbe\u7f6e\u3002<\/p>\n<h4>5. \u8bfb\u672a\u63d0\u4ea4&#xff08;Read Uncommitted&#xff09;\u5b9e\u9a8c<\/h4>\n<p>\u51e0\u4e4e\u6ca1\u6709\u52a0\u9501&#xff0c;\u867d\u7136\u6548\u7387\u9ad8\u4f46\u662f\u95ee\u9898\u592a\u591a&#xff0c;\u4e25\u91cd\u4e0d\u5efa\u8bae\u91c7\u7528\u3002<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">read<\/span> <span class=\"token keyword\">uncommitted<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u91cd\u542f\u5ba2\u6237\u7aef<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span>   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">READ<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">UNCOMMITTED<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">100.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">update<\/span> account <span class=\"token keyword\">set<\/span> blance<span class=\"token operator\">&#061;<\/span><span class=\"token number\">123.0<\/span> <span class=\"token keyword\">where<\/span> id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u66f4\u65b0\u6307\u5b9a\u884c<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.05<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">Rows<\/span> <span class=\"token keyword\">matched<\/span>: <span class=\"token number\">1<\/span> Changed: <span class=\"token number\">1<\/span> <span class=\"token keyword\">Warnings<\/span>: <span class=\"token number\">0<\/span><br \/>\n<span class=\"token comment\">&#8212; \u6ca1\u6709commit\u54e6&#xff01;&#xff01;&#xff01;<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">123.00<\/span> <span class=\"token operator\">|<\/span>  <span class=\"token comment\">&#8212; \u8bfb\u5230\u7ec8\u7aefA\u66f4\u65b0\u4f46\u662f\u672acommit\u7684\u6570\u636e[insert&#xff0c;delete\u540c\u6837]<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e00\u4e2a\u4e8b\u52a1\u5728\u6267\u884c\u4e2d\u8bfb\u5230\u53e6\u4e00\u4e2a\u6267\u884c\u4e2d\u4e8b\u52a1\u7684\u66f4\u65b0&#xff08;\u6216\u5176\u4ed6\u64cd\u4f5c&#xff09;\u4f46\u662f\u672a commit \u7684\u6570\u636e&#xff0c;\u8fd9\u79cd\u73b0\u8c61\u53eb\u505a\u810f\u8bfb&#xff08;dirty read&#xff09;\u3002<\/p>\n<h4>6. \u8bfb\u63d0\u4ea4&#xff08;Read Committed&#xff09;\u5b9e\u9a8c<\/h4>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">read<\/span> <span class=\"token keyword\">committed<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u91cd\u542f\u5ba2\u6237\u7aef<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u67e5\u770b\u5f53\u524d\u6570\u636e<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">123.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u624b\u52a8\u5f00\u542f\u4e8b\u52a1&#xff0c;\u540c\u6b65\u7684\u5f00\u59cb\u7ec8\u7aefB\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">update<\/span> account <span class=\"token keyword\">set<\/span> blance<span class=\"token operator\">&#061;<\/span><span class=\"token number\">321.0<\/span> <span class=\"token keyword\">where<\/span> id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u66f4\u65b0\u5f20\u4e09\u6570\u636e<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">Rows<\/span> <span class=\"token keyword\">matched<\/span>: <span class=\"token number\">1<\/span> Changed: <span class=\"token number\">1<\/span> <span class=\"token keyword\">Warnings<\/span>: <span class=\"token number\">0<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u7ec8\u7aef\u5230\u7ec8\u7aefB&#xff0c;\u67e5\u770b\u6570\u636e<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; commit\u63d0\u4ea4&#xff01;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.01<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u7ec8\u7aef\u5230\u7ec8\u7aefB&#xff0c;\u518d\u6b21\u67e5\u770b\u6570\u636e<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u624b\u52a8\u5f00\u542f\u4e8b\u52a1&#xff0c;\u548c\u7ec8\u7aefA\u4e00\u524d\u4e00\u540e<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA commit\u4e4b\u524d&#xff0c;\u67e5\u770b\u4e0d\u5230<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">123.00<\/span> <span class=\"token operator\">|<\/span>  <span class=\"token comment\">&#8212; \u8001\u7684\u503c<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7ec8\u7aefA commit\u4e4b\u540e&#xff0c;\u770b\u5230\u4e86&#xff01;<\/span><br \/>\n<span class=\"token comment\">&#8212; but&#xff0c;\u6b64\u65f6\u8fd8\u5728\u5f53\u524d\u4e8b\u52a1\u4e2d&#xff0c;\u5e76\u672acommit&#xff0c;\u90a3\u4e48\u5c31\u9020\u6210\u4e86\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u540c\u6837\u7684\u8bfb\u53d6\u5728\u4e0d\u540c\u7684\u65f6\u95f4\u6bb5<\/span><br \/>\n<span class=\"token comment\">&#8212; &#xff08;\u4f9d\u65e7\u8fd8\u5728\u4e8b\u52a1\u64cd\u4f5c\u4e2d&#xff01;&#xff09;\u8bfb\u53d6\u5230\u4e86\u4e0d\u540c\u7684\u503c&#xff0c;\u8fd9\u79cd\u73b0\u8c61\u53eb\u505a\u4e0d\u53ef\u91cd\u590d\u8bfb&#xff08;non-repeatable read&#xff09;&#xff01;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">321.00<\/span> <span class=\"token operator\">|<\/span>  <span class=\"token comment\">&#8212; \u65b0\u7684\u503c<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<h4>7. \u53ef\u91cd\u590d\u8bfb&#xff08;Repeatable Read&#xff09;\u5b9e\u9a8c<\/h4>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">repeatable<\/span> <span class=\"token keyword\">read<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u8bbe\u7f6e\u5168\u5c40\u9694\u79bb\u7ea7\u522bRR<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.01<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5173\u95ed\u7ec8\u7aef\u91cd\u542f<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span>  <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span> <span class=\"token operator\">|<\/span>  <span class=\"token comment\">&#8212; \u9694\u79bb\u7ea7\u522bRR<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u67e5\u770b\u5f53\u524d\u6570\u636e<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1&#xff0c;\u540c\u6b65\u7684\u7ec8\u7aefB\u4e5f\u5f00\u59cb\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">update<\/span> account <span class=\"token keyword\">set<\/span> blance<span class=\"token operator\">&#061;<\/span><span class=\"token number\">4321.0<\/span> <span class=\"token keyword\">where<\/span> id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u66f4\u65b0\u6570\u636e<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">Rows<\/span> <span class=\"token keyword\">matched<\/span>: <span class=\"token number\">1<\/span> Changed: <span class=\"token number\">1<\/span> <span class=\"token keyword\">Warnings<\/span>: <span class=\"token number\">0<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u5230\u7ec8\u7aefB&#xff0c;\u67e5\u770b\u53e6\u4e00\u4e2a\u4e8b\u52a1\u662f\u5426\u80fd\u770b\u5230<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d0\u4ea4\u4e8b\u52a1<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u7ec8\u7aef\u5230\u7ec8\u7aefB&#xff0c;\u67e5\u770b\u6570\u636e<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u4e2d\u4e8b\u52a1commit\u4e4b\u524d&#xff0c;\u67e5\u770b\u5f53\u524d\u8868\u4e2d\u6570\u636e&#xff0c;\u6570\u636e\u672a\u66f4\u65b0<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u4e2d\u4e8b\u52a1commit\u4e4b\u540e&#xff0c;\u67e5\u770b\u5f53\u524d\u8868\u4e2d\u6570\u636e&#xff0c;\u6570\u636e\u672a\u66f4\u65b0<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u53ef\u4ee5\u770b\u5230&#xff0c;\u5728\u7ec8\u7aefB\u4e2d\u4e8b\u52a1\u65e0\u8bba\u4ec0\u4e48\u65f6\u5019\u8fdb\u884c\u67e5\u627e&#xff0c;\u770b\u5230\u7684\u7ed3\u679c\u90fd\u662f\u4e00\u81f4\u7684&#xff0c;\u8fd9\u53eb\u505a\u53ef\u91cd\u590d\u8bfb&#xff01;<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ed3\u675f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u518d\u6b21\u67e5\u770b&#xff0c;\u770b\u5230\u6700\u65b0\u7684\u66f4\u65b0\u6570\u636e<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<p>\u5982\u679c\u5c06\u4e0a\u9762\u7ec8\u7aef A \u4e2d\u7684 update \u64cd\u4f5c\u6539\u6210 insert \u64cd\u4f5c&#xff0c;\u4f1a\u6709\u4ec0\u4e48\u95ee\u9898&#xff1f;<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>   <span class=\"token number\">321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1&#xff0c;\u7ec8\u7aefB\u540c\u6b65\u5f00\u542f<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> account <span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">,<\/span>name<span class=\"token punctuation\">,<\/span>blance<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">values<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u738b\u4e94&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5432.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u5230\u7ec8\u7aefB&#xff0c;\u67e5\u770b\u53e6\u4e00\u4e2a\u4e8b\u52a1\u662f\u5426\u80fd\u770b\u5230<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d0\u4ea4\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5207\u6362\u7ec8\u7aef\u5230\u7ec8\u7aefB&#xff0c;\u67e5\u770b\u6570\u636e<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">3<\/span> <span class=\"token operator\">|<\/span> \u738b\u4e94   <span class=\"token operator\">|<\/span>  <span class=\"token number\">5432.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">3<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA commit\u524d\u67e5\u770b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA commit\u540e\u67e5\u770b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u591a\u6b21\u67e5\u770b<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">2<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53d1\u73b0\u7ec8\u7aef A \u5728\u5bf9\u5e94\u4e8b\u52a1\u4e2d insert \u7684\u6570\u636e&#xff0c;\u5728\u7ec8\u7aef B \u7684\u4e8b\u52a1\u5468\u671f\u4e2d\u4e5f\u6ca1\u6709\u4ec0\u4e48\u5f71\u54cd&#xff0c;\u4e5f\u7b26\u5408\u53ef\u91cd\u590d\u7684\u7279\u70b9\u3002<\/p>\n<p>\u4f46\u662f\u4e00\u822c\u7684\u6570\u636e\u5e93\u5728\u53ef\u91cd\u590d\u8bfb\u60c5\u51b5\u7684\u65f6\u5019&#xff0c;\u65e0\u6cd5\u5c4f\u853d\u5176\u4ed6\u4e8b\u52a1 insert \u7684\u6570\u636e&#xff08;\u4e3a\u4ec0\u4e48&#xff1f;\u56e0\u4e3a\u9694\u79bb\u6027\u5b9e\u73b0\u662f\u5bf9\u6570\u636e\u52a0\u9501\u5b8c\u6210\u7684&#xff0c;\u800c insert \u5f85\u63d2\u5165\u7684\u6570\u636e\u56e0\u4e3a\u5e76\u4e0d\u5b58\u5728&#xff0c;\u90a3\u4e48\u4e00\u822c\u52a0\u9501\u65e0\u6cd5\u5c4f\u853d\u8fd9\u7c7b\u95ee\u9898&#xff09;&#xff0c;\u4f1a\u9020\u6210\u867d\u7136\u5927\u90e8\u5206\u5185\u5bb9\u662f\u53ef\u91cd\u590d\u8bfb\u7684&#xff0c;\u4f46\u662f insert \u7684\u6570\u636e\u5728\u53ef\u91cd\u590d\u8bfb\u60c5\u51b5\u88ab\u8bfb\u53d6\u51fa\u6765&#xff0c;\u5bfc\u81f4\u591a\u6b21\u67e5\u627e\u65f6\u4f1a\u591a\u67e5\u627e\u51fa\u6765\u65b0\u7684\u8bb0\u5f55&#xff0c;\u5c31\u5982\u540c\u4ea7\u751f\u4e86\u5e7b\u89c9\u3002\u8fd9\u79cd\u73b0\u8c61\u53eb\u505a\u5e7b\u8bfb&#xff08;phantom read&#xff09;\u3002<\/p>\n<p>\u5f88\u660e\u663e&#xff0c;MySQL \u5728 RR \u7ea7\u522b\u7684\u65f6\u5019\u662f\u89e3\u51b3\u4e86\u5e7b\u8bfb\u95ee\u9898\u7684&#xff08;\u89e3\u51b3\u7684\u65b9\u5f0f\u662f\u7528 Next-Key \u9501&#xff08;GAP&#043;\u884c\u9501&#xff09;\u89e3\u51b3\u7684&#xff0c;\u8fd9\u5757\u6bd4\u8f83\u96be&#xff0c;\u6709\u5174\u8da3\u540c\u5b66\u4e86\u89e3\u4e00\u4e0b&#xff09;\u3002<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ed3\u675f\u4e8b\u52a1<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u770b\u5230\u66f4\u65b0<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">3<\/span> <span class=\"token operator\">|<\/span> \u738b\u4e94   <span class=\"token operator\">|<\/span>  <span class=\"token number\">5432.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">3<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<h4>8. \u4e32\u884c\u5316&#xff08;Serializable&#xff09;\u5b9e\u9a8c<\/h4>\n<p>\u5bf9\u6240\u6709\u64cd\u4f5c\u5168\u90e8\u52a0\u9501\u8fdb\u884c\u4e32\u884c\u5316&#xff0c;\u4e0d\u4f1a\u6709\u95ee\u9898&#xff0c;\u4f46\u662f\u53ea\u8981\u4e32\u884c\u5316\u6548\u7387\u5f88\u4f4e&#xff0c;\u51e0\u4e4e\u5b8c\u5168\u4e0d\u4f1a\u88ab\u91c7\u7528\u3002\u6ce8\u610f\u662f\u5bf9\u4e8b\u52a1\u7684\u4e32\u884c\u5316\u3002<\/p>\n<p>\u7ec8\u7aef A&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">serializable<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">SERIALIZABLE<\/span>   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u5f00\u542f\u4e8b\u52a1&#xff0c;\u7ec8\u7aefB\u540c\u6b65\u5f00\u542f<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4e24\u4e2a\u8bfb\u53d6\u4e0d\u4f1a\u4e32\u884c\u5316&#xff0c;\u5171\u4eab\u9501<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">3<\/span> <span class=\"token operator\">|<\/span> \u738b\u4e94   <span class=\"token operator\">|<\/span>  <span class=\"token number\">5432.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">3<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">update<\/span> account <span class=\"token keyword\">set<\/span> blance<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1.00<\/span> <span class=\"token keyword\">where<\/span> id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u7ec8\u7aefA\u4e2d\u6709\u66f4\u65b0\u6216\u8005\u5176\u4ed6\u64cd\u4f5c&#xff0c;\u4f1a\u963b\u585e&#xff0c;\u76f4\u5230\u7ec8\u7aefB\u4e8b\u52a1\u63d0\u4ea4<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">18.19<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">Rows<\/span> <span class=\"token keyword\">matched<\/span>: <span class=\"token number\">1<\/span> Changed: <span class=\"token number\">1<\/span> <span class=\"token keyword\">Warnings<\/span>: <span class=\"token number\">0<\/span><\/p>\n<p>\u7ec8\u7aef B&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">begin<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> account<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u4e24\u4e2a\u8bfb\u53d6\u4e0d\u4f1a\u4e32\u884c\u5316<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> id <span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> blance   <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">1<\/span> <span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">4321.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">2<\/span> <span class=\"token operator\">|<\/span> \u674e\u56db   <span class=\"token operator\">|<\/span> <span class=\"token number\">10000.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">|<\/span>  <span class=\"token number\">3<\/span> <span class=\"token operator\">|<\/span> \u738b\u4e94   <span class=\"token operator\">|<\/span>  <span class=\"token number\">5432.00<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;-&#043;&#8212;&#8212;&#8211;&#043;&#8212;&#8212;&#8212;-&#043;<\/span><br \/>\n<span class=\"token number\">3<\/span> <span class=\"token keyword\">rows<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">commit<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">&#8212; \u63d0\u4ea4\u4e4b\u540e&#xff0c;\u7ec8\u7aefA\u4e2d\u7684update\u624d\u4f1a\u63d0\u4ea4<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<h4>9. \u9694\u79bb\u7ea7\u522b\u603b\u7ed3<\/h4>\n<ul>\n<li>\u9694\u79bb\u7ea7\u522b\u8d8a\u4e25\u683c&#xff0c;\u5b89\u5168\u6027\u8d8a\u9ad8&#xff0c;\u4f46\u6570\u636e\u5e93\u7684\u5e76\u53d1\u6027\u80fd\u4e5f\u5c31\u8d8a\u4f4e&#xff0c;\u5f80\u5f80\u9700\u8981\u5728\u4e24\u8005\u4e4b\u95f4\u627e\u4e00\u4e2a\u5e73\u8861\u70b9\u3002<\/li>\n<li>\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u91cd\u70b9\u662f\u4fee\u6539\u548c\u5220\u9664&#xff1a;\u540c\u6837\u7684\u6761\u4ef6&#xff0c;\u4f60\u8bfb\u53d6\u8fc7\u7684\u6570\u636e\u518d\u6b21\u8bfb\u53d6\u51fa\u6765\u53d1\u73b0\u503c\u4e0d\u4e00\u6837\u4e86\u3002<\/li>\n<li>\u5e7b\u8bfb\u7684\u91cd\u70b9\u5728\u4e8e\u65b0\u589e&#xff1a;\u540c\u6837\u7684\u6761\u4ef6&#xff0c;\u7b2c 1 \u6b21\u548c\u7b2c 2 \u6b21\u8bfb\u51fa\u6765\u7684\u8bb0\u5f55\u6570\u4e0d\u4e00\u6837\u3002<\/li>\n<li>MySQL \u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u662f\u53ef\u91cd\u590d\u8bfb&#xff0c;\u4e00\u822c\u60c5\u51b5\u4e0b\u4e0d\u8981\u4fee\u6539\u3002<\/li>\n<li>\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u51fa\u4e8b\u52a1\u4e5f\u6709\u957f\u77ed\u4e8b\u52a1\u8fd9\u6837\u7684\u6982\u5ff5\u3002\u4e8b\u52a1\u95f4\u4e92\u76f8\u5f71\u54cd\u6307\u7684\u662f\u4e8b\u52a1\u5728\u5e76\u884c\u6267\u884c\u7684\u65f6\u5019&#xff0c;\u5373\u90fd\u6ca1\u6709 commit \u7684\u65f6\u5019\u5f71\u54cd\u4f1a\u6bd4\u8f83\u5927\u3002<\/li>\n<\/ul>\n<h4>10. \u4e00\u81f4\u6027&#xff08;Consistency&#xff09;<\/h4>\n<p>\u4e8b\u52a1\u6267\u884c\u7684\u7ed3\u679c\u5fc5\u987b\u4f7f\u6570\u636e\u5e93\u4ece\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u53d8\u5230\u53e6\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u3002\u5f53\u6570\u636e\u5e93\u53ea\u5305\u542b\u4e8b\u52a1\u6210\u529f\u63d0\u4ea4\u7684\u7ed3\u679c\u65f6&#xff0c;\u6570\u636e\u5e93\u5904\u4e8e\u4e00\u81f4\u6027\u72b6\u6001\u3002\u5982\u679c\u7cfb\u7edf\u8fd0\u884c\u53d1\u751f\u4e2d\u65ad&#xff0c;\u67d0\u4e2a\u4e8b\u52a1\u5c1a\u672a\u5b8c\u6210\u800c\u88ab\u8feb\u4e2d\u65ad&#xff0c;\u800c\u8be5\u672a\u5b8c\u6210\u7684\u4e8b\u52a1\u5bf9\u6570\u636e\u5e93\u6240\u505a\u7684\u4fee\u6539\u5df2\u88ab\u5199\u5165\u6570\u636e\u5e93&#xff0c;\u6b64\u65f6\u6570\u636e\u5e93\u5c31\u5904\u4e8e\u4e00\u79cd\u4e0d\u6b63\u786e&#xff08;\u4e0d\u4e00\u81f4&#xff09;\u7684\u72b6\u6001\u3002\u56e0\u6b64\u4e00\u81f4\u6027\u662f\u901a\u8fc7\u539f\u5b50\u6027\u6765\u4fdd\u8bc1\u7684\u3002<\/p>\n<p>\u5176\u5b9e\u4e00\u81f4\u6027\u548c\u7528\u6237\u7684\u4e1a\u52a1\u903b\u8f91\u5f3a\u76f8\u5173&#xff0c;\u4e00\u822c MySQL \u63d0\u4f9b\u6280\u672f\u652f\u6301&#xff0c;\u4f46\u662f\u4e00\u81f4\u6027\u8fd8\u662f\u8981\u7528\u6237\u4e1a\u52a1\u903b\u8f91\u505a\u652f\u6491&#xff0c;\u4e5f\u5c31\u662f\u4e00\u81f4\u6027\u662f\u7531\u7528\u6237\u51b3\u5b9a\u7684\u3002\u800c\u6280\u672f\u4e0a\u901a\u8fc7 AID&#xff08;\u539f\u5b50\u6027\u3001\u9694\u79bb\u6027\u3001\u6301\u4e45\u6027&#xff09;\u4fdd\u8bc1 C&#xff08;\u4e00\u81f4\u6027&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u9694\u79bb\u6027\u7684\u5177\u4f53\u5b9e\u73b0&#xff08;MVCC&#xff09;<\/h3>\n<h4>1. \u5982\u4f55\u7406\u89e3\u9694\u79bb\u60272<\/h4>\n<p>\u6570\u636e\u5e93\u5e76\u53d1\u7684\u573a\u666f\u6709\u4e09\u79cd&#xff1a;<\/p>\n<ul>\n<li>\u8bfb-\u8bfb&#xff1a;\u4e0d\u5b58\u5728\u4efb\u4f55\u95ee\u9898&#xff0c;\u4e5f\u4e0d\u9700\u8981\u5e76\u53d1\u63a7\u5236<\/li>\n<li>\u8bfb-\u5199&#xff1a;\u6709\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898&#xff0c;\u53ef\u80fd\u4f1a\u9020\u6210\u4e8b\u52a1\u9694\u79bb\u6027\u95ee\u9898&#xff0c;\u53ef\u80fd\u9047\u5230\u810f\u8bfb\u3001\u5e7b\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb<\/li>\n<li>\u5199-\u5199&#xff1a;\u6709\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898&#xff0c;\u53ef\u80fd\u4f1a\u5b58\u5728\u66f4\u65b0\u4e22\u5931\u95ee\u9898&#xff0c;\u6bd4\u5982\u7b2c\u4e00\u7c7b\u66f4\u65b0\u4e22\u5931\u3001\u7b2c\u4e8c\u7c7b\u66f4\u65b0\u4e22\u5931&#xff08;\u540e\u9762\u8865\u5145&#xff09;<\/li>\n<\/ul>\n<p>\u6211\u4eec\u4e3b\u8981\u5b66\u4e60\u8bfb\u5199\u7684\u573a\u666f\u3002<\/p>\n<h4>2. \u8bfb-\u5199\u4e0e MVCC<\/h4>\n<p>\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236&#xff08;MVCC&#xff09;\u662f\u4e00\u79cd\u7528\u6765\u89e3\u51b3\u8bfb-\u5199\u51b2\u7a81\u7684\u65e0\u9501\u5e76\u53d1\u63a7\u5236\u3002\u4e3a\u4e8b\u52a1\u5206\u914d\u5355\u5411\u589e\u957f\u7684\u4e8b\u52a1 ID&#xff0c;\u4e5f\u5c31\u662f\u8bf4\u4e8b\u52a1 id \u548c\u4e8b\u52a1\u662f\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb&#xff0c;\u5e76\u4e14\u4e00\u822c\u6765\u8bf4 id \u8d8a\u5c0f\u5c31\u8bc1\u660e\u8be5\u4e8b\u52a1\u8d8a\u5148\u5230\u6765&#xff0c;\u6240\u4ee5\u6839\u636e id \u7684\u5927\u5c0f\u53ef\u4ee5\u5224\u65ad\u4e8b\u52a1\u7684\u5148\u540e\u987a\u5e8f\u3002\u4e3a\u6bcf\u4e2a\u4fee\u6539\u4fdd\u5b58\u4e00\u4e2a\u7248\u672c&#xff0c;\u7248\u672c\u4e0e\u4e8b\u52a1 ID \u5173\u8054&#xff0c;\u8bfb\u64cd\u4f5c\u53ea\u8bfb\u8be5\u4e8b\u52a1\u5f00\u59cb\u524d\u7684\u6570\u636e\u5e93\u7684\u5feb\u7167\u3002<\/p>\n<p>\u6240\u4ee5 MVCC \u53ef\u4ee5\u4e3a\u6570\u636e\u5e93\u89e3\u51b3\u4ee5\u4e0b\u95ee\u9898&#xff1a;\u5728\u5e76\u53d1\u8bfb\u5199\u6570\u636e\u5e93\u65f6&#xff0c;\u53ef\u4ee5\u505a\u5230\u5728\u8bfb\u64cd\u4f5c\u65f6\u4e0d\u7528\u963b\u585e\u5199\u64cd\u4f5c&#xff0c;\u5199\u64cd\u4f5c\u4e5f\u4e0d\u7528\u963b\u585e\u8bfb\u64cd\u4f5c&#xff0c;\u63d0\u9ad8\u4e86\u6570\u636e\u5e93\u5e76\u53d1\u8bfb\u5199\u7684\u6027\u80fd&#xff1b;\u540c\u65f6\u8fd8\u53ef\u4ee5\u89e3\u51b3\u810f\u8bfb\u3001\u5e7b\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u7b49\u4e8b\u52a1\u9694\u79bb\u95ee\u9898&#xff0c;\u4f46\u4e0d\u80fd\u89e3\u51b3\u66f4\u65b0\u4e22\u5931\u95ee\u9898\u3002<\/p>\n<h4>3. \u5171\u8bc6<\/h4>\n<li>\u6bcf\u4e00\u4e2a\u4e8b\u52a1\u90fd\u8981\u6709\u81ea\u5df1\u7684\u4e8b\u52a1 id&#xff0c;\u5e76\u4e14\u4e8b\u52a1 id \u7684\u5927\u5c0f\u51b3\u5b9a\u4e86\u4e8b\u52a1\u7684\u5148\u540e\u987a\u5e8f\u3002<\/li>\n<li>mysqld \u53ef\u80fd\u4f1a\u9762\u4e34\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4e8b\u52a1\u7684\u60c5\u51b5&#xff0c;\u5904\u7406\u4e8b\u52a1\u662f\u9700\u8981\u65f6\u95f4\u7684\u3002\u867d\u7136\u5bf9\u4e0a\u6211\u4eec\u770b\u5230\u4e8b\u52a1\u662f\u539f\u5b50\u7684&#xff0c;\u4f46\u662f\u5b9e\u9645\u4e8b\u52a1\u7684\u5904\u7406\u662f\u9700\u8981\u65f6\u95f4\u7684&#xff0c;\u6240\u4ee5\u4e8b\u52a1\u6709\u81ea\u5df1\u7684\u751f\u547d\u5468\u671f\u3002\u6240\u4ee5 mysqld \u80af\u5b9a\u8981\u5bf9\u591a\u4e2a\u4e8b\u52a1\u8fdb\u884c\u7ba1\u7406&#xff0c;\u6ce8\u5b9a\u4e86\u4f1a\u5bf9\u4e8b\u52a1\u8fdb\u884c\u5148\u63cf\u8ff0\u518d\u7ec4\u7ec7\u3002\u6240\u4ee5\u4e8b\u52a1\u5728\u6211\u770b\u6765\u5c31\u662f\u5728 mysqld \u4e2d\u7684\u4e00\u79cd\u7ed3\u6784\u4f53\u5bf9\u8c61\u6216\u8005\u7c7b\u5bf9\u8c61&#xff0c;\u5bf9\u4e8b\u52a1\u7684\u7ba1\u7406\u5c31\u662f\u5bf9\u7ed3\u6784\u4f53\u7684\u7ba1\u7406&#xff0c;\u7136\u540e\u7528\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u7ba1\u7406\u8fd9\u4e2a\u4e8b\u52a1\u7684\u7ed3\u6784\u4f53&#xff0c;\u6240\u4ee5\u6211\u4eec\u5bf9\u4e8b\u52a1\u7684\u64cd\u4f5c\u5c31\u662f\u5bf9\u7279\u5b9a\u7684\u6570\u636e\u7ed3\u6784\u7684\u589e\u5220\u67e5\u6539\u64cd\u4f5c\u3002<\/li>\n<h4>4. \u7406\u89e3 MVCC \u9700\u8981\u77e5\u9053\u4e09\u4e2a\u524d\u63d0\u77e5\u8bc6<\/h4>\n<li>3 \u4e2a\u8bb0\u5f55\u9690\u85cf\u5b57\u6bb5<\/li>\n<li>undo \u65e5\u5fd7<\/li>\n<li>Read View<\/li>\n<hr \/>\n<h4>5. \u4e09\u4e2a\u8bb0\u5f55\u9690\u85cf\u5217\u5b57\u6bb5<\/h4>\n<ul>\n<li>DB_TRX_ID&#xff1a;6 byte&#xff0c;\u6700\u8fd1\u4fee\u6539&#xff08;\u4fee\u6539\/\u63d2\u5165&#xff09;\u4e8b\u52a1 ID&#xff0c;\u8bb0\u5f55\u521b\u5efa\u8fd9\u6761\u8bb0\u5f55\/\u6700\u540e\u4e00\u6b21\u4fee\u6539\u8be5\u8bb0\u5f55\u7684\u4e8b\u52a1 ID\u3002\u5373\u4f7f\u662f\u5355 SQL \u4e5f\u662f\u4f1a\u88ab\u5305\u88c5\u6210\u4e8b\u52a1\u8fdb\u884c\u5904\u7406\u3002<\/li>\n<li>DB_ROLL_PTR&#xff1a;7 byte&#xff0c;\u56de\u6eda\u6307\u9488&#xff0c;\u6307\u5411\u8fd9\u6761\u8bb0\u5f55\u7684\u4e0a\u4e00\u4e2a\u7248\u672c&#xff08;\u7b80\u5355\u7406\u89e3\u6210\u6307\u5411\u5386\u53f2\u7248\u672c\u5c31\u884c&#xff0c;\u8fd9\u4e9b\u6570\u636e\u4e00\u822c\u5728 undo log \u4e2d&#xff09;\u3002\u5b9e\u9645\u4e0a&#xff0c;\u5982\u679c\u4f60\u5bf9 MySQL \u4e2d\u8868\u4e2d\u7684\u67d0\u4e00\u884c\u8bb0\u5f55\u8fdb\u884c\u4fee\u6539&#xff0c;MySQL \u5728\u7279\u5b9a\u7684\u9694\u79bb\u7ea7\u522b\u4e0b\u4e0d\u4e00\u5b9a\u4f1a\u76f4\u63a5\u53bb\u4fee\u6539\u539f\u8868\u6570\u636e&#xff0c;\u53ef\u80fd\u4f1a\u628a\u4f60\u8981\u6539\u7684\u8bb0\u5f55\u5728\u6539\u4e4b\u524d\u5148\u4fdd\u5b58\u4e00\u4efd\u7136\u540e\u6539\u65b0\u7684&#xff0c;\u8fd9\u6837\u5373\u4f7f\u6211\u6539\u4e86\u6570\u636e\u6211\u4ecd\u7136\u77e5\u9053\u4ee5\u524d\u7684\u6570\u636e&#xff0c;\u6240\u4ee5\u65b0\u6539\u4e00\u5b9a\u8981\u627e\u5230\u6ca1\u6709\u6539\u4e4b\u524d\u7684\u8bb0\u5f55\u3002<\/li>\n<li>DB_ROW_ID&#xff1a;6 byte&#xff0c;\u9690\u542b\u7684\u81ea\u589e ID&#xff08;\u9690\u85cf\u4e3b\u952e&#xff09;&#xff0c;\u5982\u679c\u6570\u636e\u8868\u6ca1\u6709\u4e3b\u952e&#xff0c;InnoDB \u4f1a\u81ea\u52a8\u4ee5 DB_ROW_ID \u4ea7\u751f\u4e00\u4e2a\u805a\u7c07\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<p>\u8865\u5145&#xff1a;\u5b9e\u9645\u8fd8\u6709\u4e00\u4e2a\u5220\u9664 flag \u9690\u85cf\u5b57\u6bb5&#xff0c;\u5373\u8bb0\u5f55\u88ab\u66f4\u65b0\u6216\u5220\u9664\u5e76\u4e0d\u4ee3\u8868\u771f\u7684\u5220\u9664&#xff0c;\u800c\u662f\u5220\u9664 flag \u53d8\u4e86\u3002<\/p>\n<p>\u6240\u4ee5\u4e00\u4e2a\u8868\u771f\u6b63\u7684\u6837\u5b50\u662f&#xff1a;<\/p>\n<p>mysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">create<\/span> <span class=\"token keyword\">table<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token operator\">not<\/span> <span class=\"token keyword\">exists<\/span> student<span class=\"token punctuation\">(<\/span><br \/>\n    name <span class=\"token keyword\">varchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">11<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    age <span class=\"token keyword\">int<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> student <span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5f20\u4e09&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">28<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.05<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">from<\/span> student<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8211;&#043;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> name   <span class=\"token operator\">|<\/span> age <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8211;&#043;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> \u5f20\u4e09   <span class=\"token operator\">|<\/span>  <span class=\"token number\">28<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8211;&#043;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd9\u4e2a\u662f\u6211\u4eec\u4e4b\u524d\u5b66\u4e60\u5230\u7684\u3002\u4f46\u662f\u4e0a\u9762\u63cf\u8ff0\u7684\u771f\u6b63\u7684\u610f\u601d\u662f&#xff1a;<\/p>\n<table>\n<tr>nameageDB_TRX_ID&#xff08;\u521b\u5efa\u8be5\u8bb0\u5f55\u7684\u4e8b\u52a1ID&#xff09;DB_ROW_ID&#xff08;\u9690\u5f0f\u4e3b\u952e&#xff09;DB_ROLL_PTR&#xff08;\u56de\u6eda\u6307\u9488&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u5f20\u4e09<\/td>\n<td>28<\/td>\n<td>null<\/td>\n<td>1<\/td>\n<td>null<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6211\u4eec\u76ee\u524d\u5e76\u4e0d\u77e5\u9053\u521b\u5efa\u8be5\u8bb0\u5f55\u7684\u4e8b\u52a1 ID\u3001\u9690\u5f0f\u4e3b\u952e&#xff0c;\u5c31\u9ed8\u8ba4\u8bbe\u7f6e\u6210 null\u30011\u3002\u7b2c\u4e00\u6761\u8bb0\u5f55\u4e5f\u6ca1\u6709\u5176\u4ed6\u7248\u672c&#xff0c;\u6211\u4eec\u8bbe\u7f6e\u56de\u6eda\u6307\u9488\u4e3a null\u3002<\/p>\n<hr \/>\n<h4>6. undo \u65e5\u5fd7<\/h4>\n<p>\u8fd9\u91cc\u4e0d\u60f3\u7ec6\u8bb2&#xff0c;\u4f46\u662f\u6709\u4e00\u4ef6\u4e8b\u60c5\u5f97\u8bf4\u6e05\u695a&#xff1a;MySQL \u5c06\u6765\u662f\u4ee5\u670d\u52a1\u8fdb\u7a0b\u7684\u65b9\u5f0f\u5728\u5185\u5b58\u4e2d\u8fd0\u884c\u3002\u6211\u4eec\u4e4b\u524d\u6240\u8bb2\u7684\u6240\u6709\u673a\u5236\u2014\u2014\u7d22\u5f15\u3001\u4e8b\u52a1\u3001\u9694\u79bb\u6027\u3001\u65e5\u5fd7\u7b49&#xff0c;\u90fd\u662f\u5728\u5185\u5b58\u4e2d\u5b8c\u6210\u7684&#xff0c;\u5373\u5728 MySQL \u5185\u90e8\u7684\u76f8\u5173\u7f13\u51b2\u533a\u4e2d\u4fdd\u5b58\u76f8\u5173\u6570\u636e&#xff0c;\u5b8c\u6210\u5404\u79cd\u5224\u65ad\u64cd\u4f5c&#xff0c;\u7136\u540e\u5728\u5408\u9002\u7684\u65f6\u5019\u5c06\u76f8\u5173\u6570\u636e\u5237\u65b0\u5230\u78c1\u76d8\u5f53\u4e2d\u7684\u3002\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u7406\u89e3 undo log&#xff0c;\u7b80\u5355\u7406\u89e3\u6210\u5c31\u662f MySQL \u4e2d\u7684\u4e00\u6bb5\u5185\u5b58\u7f13\u51b2\u533a&#xff0c;\u7528\u6765\u4fdd\u5b58\u65e5\u5fd7\u6570\u636e\u7684\u5c31\u884c\u3002<\/p>\n<hr \/>\n<h4>7. \u6a21\u62df MVCC<\/h4>\n<p>\u73b0\u5728\u6709\u4e00\u4e2a\u4e8b\u52a1 10&#xff08;\u4ec5\u4ec5\u4e3a\u4e86\u597d\u533a\u5206&#xff09;&#xff0c;\u5bf9 student \u8868\u4e2d\u8bb0\u5f55\u8fdb\u884c\u4fee\u6539&#xff08;update&#xff09;&#xff1a;\u5c06 name&#xff08;\u5f20\u4e09&#xff09;\u6539\u6210 name&#xff08;\u674e\u56db&#xff09;\u3002<\/p>\n<p>\u4e8b\u52a1 10 \u56e0\u4e3a\u8981\u4fee\u6539&#xff0c;\u6240\u4ee5\u8981\u5148\u7ed9\u8be5\u8bb0\u5f55\u52a0\u884c\u9501\u3002\u4fee\u6539\u524d&#xff0c;\u5148\u5c06\u8be5\u884c\u8bb0\u5f55\u62f7\u8d1d\u5230 undo log \u4e2d&#xff0c;\u6240\u4ee5 undo log \u4e2d\u5c31\u6709\u4e86\u4e00\u884c\u526f\u672c\u6570\u636e&#xff08;\u539f\u7406\u5c31\u662f\u5199\u65f6\u62f7\u8d1d&#xff09;\u3002<\/p>\n<p>\u6240\u4ee5\u73b0\u5728 MySQL \u4e2d\u6709\u4e24\u884c\u540c\u6837\u7684\u8bb0\u5f55\u3002\u73b0\u5728\u4fee\u6539\u539f\u59cb\u8bb0\u5f55\u4e2d\u7684 name \u6539\u6210 \u2018\u674e\u56db\u2019&#xff0c;\u5e76\u4e14\u4fee\u6539\u539f\u59cb\u8bb0\u5f55\u7684\u9690\u85cf\u5b57\u6bb5 DB_TRX_ID \u4e3a\u5f53\u524d\u4e8b\u52a1 10 \u7684 ID&#xff08;\u9ed8\u8ba4\u4ece 10 \u5f00\u59cb&#xff0c;\u4e4b\u540e\u9012\u589e&#xff09;\u3002\u800c\u539f\u59cb\u8bb0\u5f55\u7684\u56de\u6eda\u6307\u9488 DB_ROLL_PTR \u5217\u91cc\u9762\u5199\u5165 undo log \u4e2d\u526f\u672c\u6570\u636e\u7684\u5730\u5740&#xff0c;\u4ece\u800c\u6307\u5411\u526f\u672c\u8bb0\u5f55&#xff0c;\u5373\u8868\u793a\u6211\u7684\u4e0a\u4e00\u4e2a\u7248\u672c\u5c31\u662f\u5b83\u3002<\/p>\n<p>\u4e8b\u52a1 10 \u63d0\u4ea4&#xff0c;\u91ca\u653e\u9501\u3002<\/p>\n<p>\u5907\u6ce8&#xff1a;\u6b64\u65f6\u6700\u65b0\u7684\u8bb0\u5f55\u662f \u2018\u674e\u56db\u2019 \u90a3\u6761\u8bb0\u5f55\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260906100910-6a9d3bc62ad75.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u56fe\u7247\u5185\u5bb9\u63cf\u8ff0&#xff1a;\u6807\u9898\u4e3a&#034;\u4e8b\u52a110\u6267\u884c\u5b8c\u6bd5\u540e&#034;\u3002\u4e0a\u65b9\u662f\u6700\u65b0\u6570\u636e\u884c&#xff1a;name&#061;\u674e\u56db&#xff0c;age&#061;28&#xff0c;DB_TRX_ID&#061;10&#xff0c;DB_ROW_ID&#061;1&#xff0c;DB_ROLL_PTR&#061;0x11223344&#xff08;\u793a\u610f&#xff09;\u3002\u4e0b\u65b9 undo log \u533a\u57df\u4e2d\u6709\u4e00\u884c\u5386\u53f2\u6570\u636e&#xff1a;name&#061;\u5f20\u4e09&#xff0c;age&#061;28&#xff0c;DB_TRX_ID&#061;null&#xff0c;DB_ROW_ID&#061;1&#xff0c;DB_ROLL_PTR&#061;null\u3002\u6700\u65b0\u6570\u636e\u884c\u7684\u56de\u6eda\u6307\u9488\u901a\u8fc7\u7bad\u5934\u6307\u5411 undo log \u4e2d\u7684\u5f20\u4e09\u8bb0\u5f55&#xff0c;\u8868\u793a\u7248\u672c\u94fe\u53ea\u6709\u4e24\u4e2a\u8282\u70b9&#xff1a;\u6700\u65b0\u7684\u674e\u56db -&gt; \u539f\u59cb\u7684\u5f20\u4e09\u3002<\/p>\n<p>\u73b0\u5728\u53c8\u6709\u4e00\u4e2a\u4e8b\u52a1 11&#xff0c;\u5bf9 student \u8868\u4e2d\u8bb0\u5f55\u8fdb\u884c\u4fee\u6539&#xff08;update&#xff09;&#xff1a;\u5c06 age&#xff08;28&#xff09;\u6539\u6210 age&#xff08;38&#xff09;\u3002<\/p>\n<p>\u4e8b\u52a1 11 \u56e0\u4e3a\u4e5f\u8981\u4fee\u6539&#xff0c;\u6240\u4ee5\u8981\u5148\u7ed9\u8be5\u8bb0\u5f55\u52a0\u884c\u9501&#xff08;\u8be5\u8bb0\u5f55\u662f\u54ea\u6761&#xff1f;\u4e00\u5b9a\u4e0d\u80fd\u662f\u5386\u53f2\u7684\u6570\u636e&#xff0c;\u6240\u4ee5\u53ea\u80fd\u6539\u6700\u65b0\u7684&#xff09;\u3002\u4fee\u6539\u524d&#xff0c;\u5148\u5c06\u8be5\u884c\u8bb0\u5f55\u62f7\u8d1d\u5230 undo log \u4e2d&#xff0c;\u6240\u4ee5 undo log \u4e2d\u5c31\u53c8\u6709\u4e86\u4e00\u884c\u526f\u672c\u6570\u636e\u3002\u6b64\u65f6\u65b0\u7684\u526f\u672c\u91c7\u7528\u5934\u63d2\u65b9\u5f0f\u63d2\u5165 undo log\u3002<\/p>\n<p>\u73b0\u5728\u4fee\u6539\u539f\u59cb\u8bb0\u5f55\u4e2d\u7684 age \u6539\u6210 38&#xff0c;\u5e76\u4e14\u4fee\u6539\u539f\u59cb\u8bb0\u5f55\u7684\u9690\u85cf\u5b57\u6bb5 DB_TRX_ID \u4e3a\u5f53\u524d\u4e8b\u52a1 11 \u7684 ID\u3002\u800c\u539f\u59cb\u8bb0\u5f55\u7684\u56de\u6eda\u6307\u9488 DB_ROLL_PTR \u5217\u91cc\u9762\u5199\u5165 undo log \u4e2d\u526f\u672c\u6570\u636e\u7684\u5730\u5740&#xff0c;\u4ece\u800c\u6307\u5411\u526f\u672c\u8bb0\u5f55&#xff0c;\u5373\u8868\u793a\u6211\u7684\u4e0a\u4e00\u4e2a\u7248\u672c\u5c31\u662f\u5b83\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260906100910-6a9d3bc698149.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u56fe\u7247\u5185\u5bb9\u63cf\u8ff0&#xff1a;\u6807\u9898\u4e3a&#034;\u4e8b\u52a111\u6267\u884c\u5b8c\u6bd5\u540e&#034;&#xff0c;\u6807\u6ce8&#034;\u6700\u65b0\u6570\u636e&#034;\u3002\u4e0a\u65b9\u6700\u65b0\u6570\u636e\u884c&#xff1a;name&#061;\u674e\u56db&#xff0c;age&#061;38&#xff0c;DB_TRX_ID&#061;11&#xff0c;DB_ROW_ID&#061;1&#xff0c;DB_ROLL_PTR&#061;0x11223366&#xff08;\u793a\u610f&#xff09;\u3002\u4e0b\u65b9 undo log \u533a\u57df\u4e2d\u6709\u4e24\u884c\u5386\u53f2\u6570\u636e&#xff0c;\u5f62\u6210\u94fe\u8868&#xff1a;\u7b2c\u4e00\u884c&#xff08;\u5934\u63d2\u7684\u65b0\u526f\u672c&#xff09;name&#061;\u674e\u56db&#xff0c;age&#061;28&#xff0c;DB_TRX_ID&#061;10&#xff0c;DB_ROW_ID&#061;1&#xff0c;DB_ROLL_PTR&#061;0x11223344&#xff08;\u793a\u610f&#xff09;&#xff1b;\u7b2c\u4e8c\u884c name&#061;\u5f20\u4e09&#xff0c;age&#061;28&#xff0c;DB_TRX_ID&#061;null&#xff0c;DB_ROW_ID&#061;1&#xff0c;DB_ROLL_PTR&#061;null\u3002\u6700\u65b0\u6570\u636e\u7684\u56de\u6eda\u6307\u9488\u6307\u5411 undo log \u4e2d\u7684\u674e\u56db(28)&#xff0c;\u674e\u56db(28)\u7684\u56de\u6eda\u6307\u9488\u6307\u5411\u5f20\u4e09(28)&#xff0c;\u5f62\u6210\u5b8c\u6574\u7684\u4e09\u8282\u70b9\u7248\u672c\u94fe&#xff1a;\u674e\u56db(38,trx&#061;11) -&gt; \u674e\u56db(28,trx&#061;10) -&gt; \u5f20\u4e09(28,null)\u3002<\/p>\n<p>\u8fd9\u6837\u6211\u4eec\u5c31\u6709\u4e86\u4e00\u4e2a\u57fa\u4e8e\u94fe\u8868\u8bb0\u5f55\u7684\u5386\u53f2\u7248\u672c\u94fe\u3002\u6240\u8c13\u7684\u56de\u6eda&#xff0c;\u65e0\u975e\u5c31\u662f\u7528\u5386\u53f2\u6570\u636e\u8986\u76d6\u5f53\u524d\u6570\u636e\u3002\u4f46\u662f\u5b9e\u9645\u4e0a\u5e76\u4e0d\u662f\u76f4\u63a5\u8fdb\u884c\u8986\u76d6&#xff0c;\u800c\u662f MySQL \u4f1a\u5728\u65e5\u5fd7\u4e2d\u8bb0\u5f55\u548c\u4f60\u5f53\u524d\u64cd\u4f5c\u76f8\u53cd\u7684\u64cd\u4f5c&#xff0c;\u4f8b\u5982\u4f60 insert \u90a3\u4e48\u65e5\u5fd7\u4e2d\u5c31\u8bb0\u5f55 delete&#xff0c;\u4f60 update \u65b0\u6570\u636e\u65e5\u5fd7\u91cc\u9762\u5c31 update \u8001\u6570\u636e&#xff0c;\u8fd9\u6837\u5728\u8fdb\u884c\u56de\u6eda\u7684\u65f6\u5019\u5c31\u628a\u8fd9\u4e9b\u64cd\u4f5c\u6267\u884c\u4e00\u904d\u5c31\u5b9e\u73b0\u4e86\u56de\u6eda\u4e86\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u4e00\u4e2a\u4e00\u4e2a\u7248\u672c&#xff0c;\u6211\u4eec\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u4e00\u4e2a\u7684\u5feb\u7167\u3002<\/p>\n<p>\u6ce8\u610f undo log \u662f\u5728\u5185\u5b58\u4e2d\u7684&#xff0c;\u6240\u4ee5\u5c31\u4ee3\u8868\u4e86\u8fd9\u4e2a\u53ea\u80fd\u4e34\u65f6\u4fdd\u5b58\u3002undo log \u91cc\u9762\u8bb0\u5f55\u7684\u662f\u4e8b\u52a1\u5728\u6267\u884c\u671f\u95f4\u7684\u64cd\u4f5c&#xff0c;\u4f46\u662f\u5982\u679c commit \u4e86\u90a3\u4e48 undo log \u91cc\u9762\u7684\u8bb0\u5f55\u4e5f\u5c31\u4f1a free\u3002\u4f46\u662f\u6ce8\u610f\u8fd9\u4e2a undo log \u8fdb\u884c free \u7684\u65f6\u5019\u5c31\u8981\u4fdd\u8bc1\u6ca1\u6709\u4eba\u6b63\u5728\u4f7f\u7528\u8fd9\u4e9b\u5386\u53f2\u6570\u636e&#xff0c;\u7c7b\u4f3c\u4e8e\u5f15\u7528\u8ba1\u6570\u3002<\/p>\n<hr \/>\n<h4>8. \u4e00\u4e9b\u601d\u8003<\/h4>\n<p>\u4e0a\u9762\u662f\u4ee5\u66f4\u65b0&#xff08;update&#xff09;\u4e3b\u8bb2\u7684&#xff0c;\u5982\u679c\u662f delete \u5462&#xff1f;\u4e00\u6837\u7684&#xff0c;\u522b\u5fd8\u4e86\u5220\u6570\u636e\u4e0d\u662f\u6e05\u7a7a&#xff0c;\u800c\u662f\u8bbe\u7f6e flag \u4e3a\u5220\u9664\u5373\u53ef&#xff0c;\u6240\u4ee5\u4e5f\u53ef\u4ee5\u4fdd\u5b58\u5386\u53f2\u8bb0\u5f55&#xff0c;\u53ef\u4ee5\u5f62\u6210\u7248\u672c\u3002<\/p>\n<p>\u5982\u679c\u662f insert \u5462&#xff1f;\u56e0\u4e3a insert \u662f\u63d2\u5165&#xff0c;\u4e5f\u5c31\u662f\u4e4b\u524d\u6ca1\u6709\u6570\u636e&#xff0c;\u90a3\u4e48 insert \u4e5f\u5c31\u6ca1\u6709\u5386\u53f2\u7248\u672c\u3002\u4f46\u662f\u4e00\u822c\u4e3a\u4e86\u56de\u6eda\u64cd\u4f5c&#xff0c;insert \u7684\u6570\u636e\u4e5f\u662f\u8981\u88ab\u653e\u5165 undo log \u4e2d&#xff0c;\u6211\u4eec\u4e4b\u524d\u8bf4\u8fc7\u65e5\u5fd7\u91cc\u9762\u4f1a\u4fdd\u5b58\u548c insert \u76f8\u53cd\u7684\u64cd\u4f5c\u4e5f\u5c31\u662f delete&#xff0c;\u56de\u6eda\u65f6\u6267\u884c delete \u5373\u53ef\u3002\u5982\u679c\u5f53\u524d\u4e8b\u52a1 commit \u4e86&#xff0c;\u90a3\u4e48\u8fd9\u4e2a undo log \u7684\u5386\u53f2 insert \u8bb0\u5f55\u5c31\u53ef\u4ee5\u88ab\u6e05\u7a7a\u4e86\u3002<\/p>\n<p>\u603b\u7ed3\u4e00\u4e0b&#xff0c;\u4e5f\u5c31\u662f\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u6210 update \u548c delete \u53ef\u4ee5\u5f62\u6210\u7248\u672c\u94fe&#xff0c;insert \u6682\u65f6\u4e0d\u8003\u8651\u3002\u90a3\u4e48 select \u5462&#xff1f;<\/p>\n<p>\u9996\u5148 select \u4e0d\u4f1a\u5bf9\u6570\u636e\u505a\u4efb\u4f55\u4fee\u6539&#xff0c;\u6240\u4ee5\u4e3a select \u7ef4\u62a4\u591a\u7248\u672c\u6ca1\u6709\u610f\u4e49\u3002\u4e0d\u8fc7\u6b64\u65f6\u6709\u4e2a\u95ee\u9898&#xff1a;select \u8bfb\u53d6\u662f\u8bfb\u53d6\u6700\u65b0\u7684\u7248\u672c\u5462&#xff1f;\u8fd8\u662f\u8bfb\u53d6\u5386\u53f2\u7248\u672c&#xff1f;<\/p>\n<ul>\n<li>\u5f53\u524d\u8bfb&#xff1a;\u8bfb\u53d6\u6700\u65b0\u7684\u8bb0\u5f55\u5c31\u662f\u5f53\u524d\u8bfb\u3002\u589e\u5220\u6539\u90fd\u53eb\u505a\u5f53\u524d\u8bfb&#xff0c;select \u4e5f\u6709\u53ef\u80fd\u5f53\u524d\u8bfb&#xff0c;\u6bd4\u5982 select lock in share mode&#xff08;\u5171\u4eab\u9501&#xff09;\u3001select for update\u3002<\/li>\n<li>\u5feb\u7167\u8bfb&#xff1a;\u8bfb\u53d6\u5386\u53f2\u7248\u672c&#xff08;\u4e00\u822c\u800c\u8a00&#xff09;\u5c31\u53eb\u505a\u5feb\u7167\u8bfb&#xff08;\u8fd9\u4e2a\u540e\u9762\u91cd\u70b9\u8ba8\u8bba&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u5386\u53f2\u7ecf\u9a8c\u544a\u8bc9\u6211\u4eec&#xff0c;\u65e0\u8bba\u662f\u5728 RC \u8fd8\u662f\u5728 RR \u7684\u9694\u79bb\u7b49\u7ea7\u4e0b\u8bfb\u5199\u90fd\u662f\u53ef\u4ee5\u5e76\u53d1\u7684\u3002\u6839\u636e\u9694\u79bb\u6027\u7684\u4e0d\u540c&#xff0c;\u6211\u4eec\u53d1\u73b0\u4f60\u5373\u4f7f\u4fee\u6539\u63d0\u4ea4\u4e86\u6211\u90fd\u6709\u53ef\u80fd\u770b\u4e0d\u5230&#xff0c;\u90a3\u4e48\u5c31\u51b3\u5b9a\u4e86\u6211\u4eec\u8bfb\u7684\u80af\u5b9a\u4e0d\u662f\u540c\u4e00\u6570\u636e\u3002\u6240\u4ee5\u4e3a\u4ec0\u4e48\u8bfb\u5199\u53ef\u4ee5\u5e76\u53d1&#xff1f;\u56e0\u4e3a\u5199\u4e00\u5b9a\u662f\u5199\u7684\u662f\u6700\u65b0\u7248\u672c&#xff0c;\u800c\u8bfb\u8bfb\u7684\u662f\u5386\u53f2\u7248\u672c&#xff0c;\u6240\u4ee5\u6211\u4eec\u4e0d\u4f1a\u51fa\u73b0\u8bbf\u95ee\u540c\u4e00\u4f4d\u7f6e&#xff0c;\u4e5f\u5c31\u4e0d\u7528\u518d\u52a0\u9501\u4e86\u3002\u4e0d\u9700\u8981\u52a0\u9501\u4e5f\u5c31\u662f\u4e0d\u4f1a\u51fa\u73b0\u76f8\u4e92\u8017\u7740\u7684\u60c5\u51b5\u4e86&#xff0c;\u6240\u4ee5\u5c31\u5b9e\u73b0\u4e86\u5e76\u53d1\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u6240\u4ee5\u9694\u79bb\u6027\u7684\u672c\u8d28\u4e0a\u5728\u6570\u636e\u4e0a\u505a\u9694\u79bb&#xff0c;\u505a\u6cd5\u4e0a\u662f\u5728\u7248\u672c\u4e0a\u505a\u9694\u79bb\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u4e0b\u6709\u4e0d\u540c\u7684\u73b0\u8c61&#xff0c;\u9694\u79bb\u6027\u7684\u4e0d\u540c\u51b3\u5b9a\u4e86\u6211\u4eec\u80fd\u770b\u5230\u54ea\u4e2a\u7248\u672c\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230&#xff0c;\u5728\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u5220\u6539\u67e5\u7684\u65f6\u5019\u90fd\u662f\u5f53\u524d\u8bfb&#xff0c;\u662f\u8981\u52a0\u9501\u7684\u3002\u90a3\u540c\u65f6\u6709 select \u8fc7\u6765&#xff0c;\u5982\u679c\u4e5f\u8981\u8bfb\u53d6\u6700\u65b0\u7248&#xff08;\u5f53\u524d\u8bfb&#xff09;&#xff0c;\u90a3\u4e48\u4e5f\u5c31\u9700\u8981\u52a0\u9501&#xff0c;\u8fd9\u5c31\u662f\u4e32\u884c\u5316\u3002\u4f46\u5982\u679c\u662f\u5feb\u7167\u8bfb&#xff0c;\u8bfb\u53d6\u5386\u53f2\u7248\u672c\u7684\u8bdd\u662f\u4e0d\u53d7\u52a0\u9501\u9650\u5236\u7684&#xff0c;\u4e5f\u5c31\u662f\u53ef\u4ee5\u5e76\u884c\u6267\u884c&#xff01;\u6362\u8a00\u4e4b\u63d0\u9ad8\u4e86\u6548\u7387&#xff0c;\u5373 MVCC \u7684\u610f\u4e49\u6240\u5728\u3002<\/p>\n<p>\u90a3\u4e48\u662f\u4ec0\u4e48\u51b3\u5b9a\u4e86 select \u662f\u5f53\u524d\u8bfb\u8fd8\u662f\u5feb\u7167\u8bfb\u5462&#xff1f;\u9694\u79bb\u7ea7\u522b&#xff01;<\/p>\n<p>\u90a3\u4e3a\u4ec0\u4e48\u8981\u6709\u9694\u79bb\u7ea7\u522b\u5462&#xff1f;\u4e8b\u52a1\u90fd\u662f\u539f\u5b50\u7684&#xff0c;\u6240\u4ee5\u65e0\u8bba\u5982\u4f55\u4e8b\u52a1\u603b\u6709\u5148\u6709\u540e\u3002\u4f46\u662f\u7ecf\u8fc7\u4e0a\u9762\u7684\u64cd\u4f5c\u6211\u4eec\u53d1\u73b0&#xff0c;\u4e8b\u52a1\u4ece begin -&gt; CURD -&gt; commit \u662f\u6709\u4e00\u4e2a\u9636\u6bb5\u7684&#xff0c;\u4e5f\u5c31\u662f\u4e8b\u52a1\u6709\u6267\u884c\u524d\u3001\u6267\u884c\u4e2d\u3001\u6267\u884c\u540e\u7684\u9636\u6bb5\u3002\u4f46\u4e0d\u7ba1\u600e\u4e48\u542f\u52a8\u591a\u4e2a\u4e8b\u52a1\u603b\u662f\u6709\u5148\u6709\u540e\u7684\u3002\u90a3\u4e48\u591a\u4e2a\u4e8b\u52a1\u5728\u6267\u884c\u4e2d CURD \u64cd\u4f5c\u662f\u4f1a\u4ea4\u7ec7\u5728\u4e00\u8d77\u7684&#xff0c;\u90a3\u4e48\u4e3a\u4e86\u4fdd\u8bc1\u4e8b\u52a1\u7684&#034;\u6709\u5148\u6709\u540e&#034;&#xff0c;\u662f\u4e0d\u662f\u5e94\u8be5\u8ba9\u4e0d\u540c\u7684\u4e8b\u52a1\u770b\u5230\u5b83\u8be5\u770b\u5230\u7684\u5185\u5bb9&#xff0c;\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u9694\u79bb\u6027\u4e0e\u9694\u79bb\u7ea7\u522b\u8981\u89e3\u51b3\u7684\u95ee\u9898\u3002<\/p>\n<p>\u5148\u6765\u7684\u4e8b\u52a1\u5e94\u4e0d\u5e94\u8be5\u770b\u5230\u540e\u6765\u7684\u4e8b\u52a1\u6240\u505a\u7684\u4fee\u6539\u5462&#xff1f;\u663e\u7136\u5728\u4e0d\u540c\u7684\u9694\u79bb\u6027\u4e0b\u5c31\u4f1a\u51fa\u73b0\u4e0d\u4e00\u6837\u7684\u64cd\u4f5c\u3002\u90a3\u4e48\u5982\u4f55\u4fdd\u8bc1\u4e0d\u540c\u7684\u4e8b\u52a1\u770b\u5230\u4e0d\u540c\u7684\u5185\u5bb9\u5462&#xff1f;\u4e5f\u5c31\u662f\u5982\u4f55\u5b9e\u73b0\u9694\u79bb\u7ea7\u522b&#xff1f;<\/p>\n<hr \/>\n<h4>9. Read View<\/h4>\n<p>Read View \u5c31\u662f\u4e8b\u52a1\u8fdb\u884c\u5feb\u7167\u8bfb\u64cd\u4f5c\u7684\u65f6\u5019\u4ea7\u751f\u7684\u8bfb\u89c6\u56fe&#xff08;Read View&#xff09;\u3002\u5728\u8be5\u4e8b\u52a1\u6267\u884c\u7684\u5feb\u7167\u8bfb\u7684\u90a3\u4e00\u523b&#xff0c;\u4f1a\u751f\u6210\u6570\u636e\u5e93\u7cfb\u7edf\u5f53\u524d\u7684\u4e00\u4e2a\u5feb\u7167&#xff0c;\u8bb0\u5f55\u5e76\u7ef4\u62a4\u7cfb\u7edf\u5f53\u524d\u6d3b\u8dc3\u4e8b\u52a1\u7684 ID&#xff08;\u5f53\u6bcf\u4e2a\u4e8b\u52a1\u5f00\u542f\u65f6\u90fd\u4f1a\u88ab\u5206\u914d\u4e00\u4e2a ID&#xff0c;\u8fd9\u4e2a ID \u662f\u9012\u589e\u7684&#xff0c;\u6240\u4ee5\u6700\u65b0\u7684\u4e8b\u52a1 ID \u503c\u8d8a\u5927&#xff09;\u3002<\/p>\n<p>Read View \u5728 MySQL \u6e90\u7801\u4e2d\u5c31\u662f\u4e00\u4e2a\u7c7b&#xff0c;\u672c\u8d28\u662f\u7528\u6765\u8fdb\u884c\u53ef\u89c1\u6027\u5224\u65ad\u7684\u3002\u5373\u5f53\u6211\u4eec\u67d0\u4e2a\u4e8b\u52a1\u6267\u884c\u5feb\u7167\u8bfb\u7684\u65f6\u5019&#xff0c;\u5bf9\u8be5\u8bb0\u5f55\u521b\u5efa\u4e00\u4e2a Read View \u8bfb\u89c6\u56fe&#xff0c;\u628a\u5b83\u6bd4\u4f5c\u6761\u4ef6&#xff0c;\u7528\u6765\u5224\u65ad\u5f53\u524d\u4e8b\u52a1\u80fd\u591f\u770b\u5230\u54ea\u4e2a\u7248\u672c\u7684\u6570\u636e&#xff0c;\u65e2\u53ef\u80fd\u662f\u5f53\u524d\u6700\u65b0\u7684\u6570\u636e&#xff0c;\u4e5f\u6709\u53ef\u80fd\u662f\u8be5\u884c\u8bb0\u5f55\u7684 undo log \u91cc\u9762\u7684\u67d0\u4e2a\u7248\u672c\u7684\u6570\u636e\u3002<\/p>\n<p>\u4e0b\u9762\u662f ReadView \u7ed3\u6784&#xff0c;\u4f46\u4e3a\u4e86\u51cf\u5c11\u8d1f\u62c5\u7b80\u5316\u4e00\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ReadView<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7701\u7565&#8230;<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/** \u9ad8\u6c34\u4f4d&#xff0c;\u5927\u4e8e\u7b49\u4e8e\u8fd9\u4e2aID\u7684\u4e8b\u52a1\u5747\u4e0d\u53ef\u89c1 *\/<\/span><br \/>\n    trx_id_t m_low_limit_id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/** \u4f4e\u6c34\u4f4d&#xff1a;\u5c0f\u4e8e\u8fd9\u4e2aID\u7684\u4e8b\u52a1\u5747\u53ef\u89c1 *\/<\/span><br \/>\n    trx_id_t m_up_limit_id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/** \u521b\u5efa\u8be5 Read View \u7684\u4e8b\u52a1ID *\/<\/span><br \/>\n    trx_id_t m_creator_trx_id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/** \u521b\u5efa\u89c6\u56fe\u65f6\u7684\u6d3b\u8dc3\u4e8b\u52a1id\u5217\u8868 *\/<\/span><br \/>\n    ids_t m_ids<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/** \u914d\u5408purge&#xff0c;\u6807\u8bc6\u8be5\u89c6\u56fe\u4e0d\u9700\u8981\u5c0f\u4e8em_low_limit_no\u7684UNDO LOG&#xff0c;<br \/>\n     * \u5982\u679c\u5176\u4ed6\u89c6\u56fe\u4e5f\u4e0d\u9700\u8981&#xff0c;\u5219\u53ef\u4ee5\u5220\u9664\u5c0f\u4e8em_low_limit_no\u7684UNDO LOG *\/<\/span><br \/>\n    trx_id_t m_low_limit_no<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/** \u6807\u8bb0\u89c6\u56fe\u662f\u5426\u88ab\u5173\u95ed *\/<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> m_closed<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7701\u7565&#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5176\u4e2d\u6700\u91cd\u8981\u7684\u5c31\u662f\u4ee5\u4e0b\u56db\u4e2a\u5b57\u6bb5&#xff1a;<\/p>\n<ul>\n<li>m_ids&#xff1a;\u4e00\u5f20\u5217\u8868&#xff0c;\u7528\u6765\u7ef4\u62a4 Read View \u751f\u6210\u65f6\u523b\u7cfb\u7edf\u6b63\u6d3b\u8dc3\u7684\u4e8b\u52a1 ID<\/li>\n<li>up_limit_id&#xff1a;\u8bb0\u5f55 m_ids \u5217\u8868\u4e2d\u4e8b\u52a1 ID \u6700\u5c0f\u7684 ID&#xff08;\u6ca1\u6709\u5199\u9519&#xff09;<\/li>\n<li>low_limit_id&#xff1a;ReadView \u751f\u6210\u65f6\u523b\u7cfb\u7edf\u5c1a\u672a\u5206\u914d\u7684\u4e0b\u4e00\u4e2a\u4e8b\u52a1 ID&#xff0c;\u4e5f\u5c31\u662f\u76ee\u524d\u5df2\u51fa\u73b0\u8fc7\u7684\u4e8b\u52a1 ID \u7684\u6700\u5927\u503c &#043; 1&#xff08;\u4e5f\u6ca1\u6709\u5199\u9519&#xff09;<\/li>\n<li>creator_trx_id&#xff1a;\u521b\u5efa\u8be5 ReadView \u7684\u4e8b\u52a1 ID<\/li>\n<\/ul>\n<p>\u6211\u4eec\u4e4b\u524d\u5b66\u4e60\u8fc7&#xff0c;\u5728\u5b9e\u9645\u8bfb\u53d6\u6570\u636e\u7248\u672c\u94fe\u7684\u65f6\u5019\u662f\u80fd\u8bfb\u53d6\u5230\u6bcf\u4e00\u4e2a\u7248\u672c\u5bf9\u5e94\u7684\u4e8b\u52a1 ID \u7684&#xff0c;\u5373\u5f53\u524d\u8bb0\u5f55\u7684 DB_TRX_ID\u3002<\/p>\n<p>\u90a3\u4e48\u6211\u4eec\u73b0\u5728\u624b\u91cc\u9762\u6709\u7684\u4e1c\u897f\u5c31\u6709&#xff1a;\u5f53\u524d\u5feb\u7167\u8bfb\u7684 ReadView \u548c\u7248\u672c\u94fe\u4e2d\u7684\u67d0\u4e00\u4e2a\u8bb0\u5f55\u7684 DB_TRX_ID\u3002\u6240\u4ee5\u73b0\u5728\u7684\u95ee\u9898\u5c31\u662f\u5f53\u524d\u5feb\u7167\u8bfb\u5e94\u4e0d\u5e94\u8be5\u8bfb\u5230\u5f53\u524d\u7248\u672c\u8bb0\u5f55\u3002\u4e00\u5f20\u56fe\u89e3\u51b3\u6240\u6709\u95ee\u9898&#xff01;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260906100911-6a9d3bc7083cc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u56fe\u7247\u5185\u5bb9\u63cf\u8ff0&#xff1a;\u8fd9\u662f\u4e00\u5f20\u7efc\u5408\u793a\u610f\u56fe&#xff0c;\u5206\u4e3a\u4e0a\u4e0b\u4e24\u90e8\u5206\u3002 \u4e0a\u534a\u90e8\u5206\u662f\u4e8b\u52a111\u6267\u884c\u5b8c\u6bd5\u540e\u7684\u7248\u672c\u94fe&#xff1a;\u6700\u65b0\u6570\u636e\u884c&#xff08;\u674e\u56db,38,DB_TRX_ID&#061;11,DB_ROW_ID&#061;1,DB_ROLL_PTR&#061;0x11223366&#xff09;\u901a\u8fc7\u56de\u6eda\u6307\u9488\u6307\u5411 undo log \u4e2d\u7684\u674e\u56db(28,DB_TRX_ID&#061;10)&#xff0c;\u518d\u6307\u5411\u5f20\u4e09(28,null)&#xff0c;\u5f62\u6210\u4e09\u8282\u70b9\u7248\u672c\u94fe\u3002 \u4e0b\u534a\u90e8\u5206\u662f Read View \u53ef\u89c1\u6027\u5224\u65ad\u7684\u65f6\u95f4\u8f74\u793a\u610f\u56fe&#xff0c;\u4ece\u5de6\u5230\u53f3\u6309\u65f6\u95f4\u5206\u4e3a\u4e09\u4e2a\u533a\u57df&#xff1a;<\/p>\n<li>&#034;\u5df2\u7ecf\u63d0\u4ea4\u7684\u4e8b\u52a1&#034;\u533a\u57df&#xff08;up_limit_id \u5de6\u4fa7&#xff09;&#xff1a;\u6807\u6ce8 creator_trx_id &#061;&#061; DB_TRX_ID \u6216 DB_TRX_ID &lt; up_limit_id&#xff0c;\u8bf4\u660e\u662f\u5386\u53f2\u4e0a\u5df2\u7ecf\u63d0\u4ea4\u7684&#xff0c;\u5e94\u8be5\u770b\u5230\u3002<\/li>\n<li>&#034;\u6b63\u5728\u64cd\u4f5c\u7684\u4e8b\u52a1&#034;\u533a\u57df&#xff08;up_limit_id \u5230 low_limit_id-1 \u4e4b\u95f4&#xff09;&#xff1a;\u6807\u6ce8\u6709\u591a\u4e2a\u4e8b\u52a1\u5c31\u6709\u591a\u4e2a\u4e8b\u52a1ID&#xff0c;\u6240\u6709\u6d3b\u8dc3\u4e8b\u52a1ID\u90fd\u5728m_ids\u4e2d&#xff1b;\u4e0b\u65b9\u6709\u601d\u7ef4\u8bef\u533a\u8bf4\u660e&#xff1a;\u5feb\u7167\u5230\u7684\u4e8b\u52a1ID\u4e0d\u4e00\u5b9a\u662f\u8fde\u7eed\u7684&#xff0c;\u6bd4\u5982\u670911,12,13,14,15\u53f7\u4e8b\u52a1&#xff0c;\u5728\u5feb\u7167\u524d12,14\u63d0\u4ea4\u4e86&#xff0c;\u90a3\u4e48m_ids\u5c31\u662f11,13,15&#xff1b;\u5982\u679cDB_TRX_ID\u4e0d\u5728m_ids\u5217\u8868\u4e2d\u8bf4\u660e\u5df2\u7ecf\u63d0\u4ea4\u53ef\u4ee5\u770b\u5230&#xff0c;\u5982\u679c\u5728\u8bf4\u660e\u8be5\u4e8b\u52a1\u548c\u6211\u4eec\u7684\u4e8b\u52a1\u4e00\u6837\u90fd\u662f\u6d3b\u8dc3\u4e8b\u52a1\u6ca1\u6709commit\u4e0d\u5e94\u8be5\u770b\u5230\u3002<\/li>\n<li>&#034;\u5feb\u7167\u540e\u65b0\u6765\u7684\u4e8b\u52a1&#034;\u533a\u57df&#xff08;low_limit_id \u53f3\u4fa7&#xff09;&#xff1a;\u6807\u6ce8 DB_TRX_ID &gt;&#061; low_limit_id&#xff0c;\u8bf4\u660e\u662f\u5feb\u7167\u4e4b\u540e\u624d\u63d0\u4ea4\u4e8b\u52a1&#xff0c;\u4e0d\u5e94\u8be5\u770b\u5230\u3002 \u5e95\u90e8\u6807\u6ce8&#xff1a;\u4efb\u4f55\u65f6\u523b\u90fd\u6709\u591a\u4e2a\u4e8b\u52a1\u5728\u4e0d\u65ad\u5230\u6765\u4e0e\u63d0\u4ea4&#xff1b;\u4e8b\u52a1ID\u4e0d\u65ad\u5728\u9012\u589e&#xff0c;\u6240\u4ee5\u4e8b\u52a1ID\u5927\u5c0f\u5c31\u80fd\u51b3\u5b9a\u5148\u540e\u987a\u5e8f\u3002 \u56fe\u4e2d\u7528\u865a\u7ebf\u7bad\u5934\u4ece\u7248\u672c\u94fe\u4e2d\u7684DB_TRX_ID\u6307\u5411\u65f6\u95f4\u8f74&#xff0c;\u8868\u793a\u62ff\u7740\u7248\u672c\u94fe\u4e2d\u7684\u4e8b\u52a1ID\u53bb\u548cRead View\u4e2d\u7684\u5404\u4e2a\u5b57\u6bb5\u505a\u6bd4\u8f83\u3002<\/li>\n<p>\u6240\u4ee5\u5f52\u6839\u7ed3\u5e95&#xff0c;\u6211\u4eec\u73b0\u5728\u8981\u505a\u7684\u64cd\u4f5c\u5c31\u662f\u62ff\u7740 ReadView \u91cc\u9762\u7684\u4e8b\u52a1 id \u548c\u5386\u53f2\u7248\u672c\u94fe\u4e2d\u6bcf\u4e00\u6761\u6bd4\u8f83 id&#xff0c;\u6765\u786e\u8ba4\u8be5\u6761\u8bb0\u5f55\u6211\u8be5\u4e0d\u8be5\u770b\u3002<\/p>\n<p>\u53ef\u89c1\u6027\u5224\u65ad\u89c4\u5219&#xff1a;<\/p>\n<li>\u53ea\u8981\u5f53\u524d\u4e8b\u52a1\u7684 creator_trx_id \u7b49\u4e8e\u5386\u53f2\u94fe\u7684 DB_TRX_ID&#xff0c;\u5c31\u8bc1\u660e\u4e86\u8be5\u8bb0\u5f55\u662f\u6211\u4fee\u6539\u7684&#xff0c;\u6240\u4ee5\u6211\u5e94\u8be5\u770b\u5230&#xff0c;\u4ece\u8fd9\u4e2a\u4ee5\u524d\u7684\u7248\u672c\u6211\u90fd\u53ef\u4ee5\u770b\u5230\u3002<\/li>\n<li>\u5f53 up_limit_id \u6bd4\u5386\u53f2\u94fe\u4e2d\u6700\u65b0\u4e5f\u5c31\u662f\u6700\u5927\u7684 DB_TRX_ID \u8fd8\u5927\u7684\u65f6\u5019&#xff0c;\u5c31\u8bc1\u660e DB_TRX_ID \u5bf9\u5e94\u7684\u4e8b\u52a1\u5e94\u8be5\u65e9\u5c31\u7ed3\u675f\u4e86&#xff0c;\u4e0d\u7136\u6211\u4e0d\u5e94\u8be5\u770b\u5230&#xff0c;\u5e76\u4e14\u6bd4\u6211\u6700\u5c0f\u7684\u8fd8\u5c0f\u8bf4\u660e\u5df2\u7ecf\u63d0\u4ea4\u4e86&#xff0c;\u6240\u4ee5\u6211\u5e94\u8be5\u770b\u5230\u3002<\/li>\n<li>\u5f53\u521b\u5efa ReadView \u7684\u65f6\u5019\u5c31\u4f1a\u521b\u5efa low_limit_id&#xff0c;\u8fd9\u4e2a\u503c\u662f ReadView \u751f\u6210\u65f6\u523b\u7cfb\u7edf\u5c1a\u672a\u5206\u914d\u7684\u4e0b\u4e00\u4e2a\u4e8b\u52a1 ID&#xff0c;\u4e5f\u5c31\u662f\u76ee\u524d\u5df2\u51fa\u73b0\u8fc7\u7684\u4e8b\u52a1 ID \u7684\u6700\u5927\u503c &#043; 1\u3002ReadView \u662f\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u503c\u5728\u8fdb\u884c\u521d\u59cb\u5316\u4e4b\u540e\u6211\u4eec\u8ba4\u4e3a\u5b83\u5c31\u4e0d\u4f1a\u53d8\u4e86\u3002\u6240\u4ee5\u5f53\u5386\u53f2\u94fe\u4e2d\u8bb0\u5f55\u4e2d DB_TRX_ID \u5927\u4e8e\u7b49\u4e8e low_limit_id&#xff0c;\u5c31\u8bc1\u660e\u4fee\u6539\u8fd9\u4e9b\u6570\u636e\u7684\u4e8b\u52a1\u662f\u5728\u6211\u4e8b\u52a1\u540e\u521b\u5efa\u7684&#xff0c;\u663e\u7136\u6211\u4e0d\u5e94\u8be5\u770b\u5230\u3002<\/li>\n<li>\u5f53\u6211\u4eec\u5728\u4e8b\u52a1\u4e2d\u65f6\u4f1a\u6709\u5f88\u591a\u4e8b\u52a1\u548c\u6211\u5e76\u53d1\u6267\u884c&#xff0c;\u6240\u4ee5\u5927\u5bb6\u540c\u65f6\u5728\u6267\u884c\u7684\u65f6\u5019\u6211\u4e5f\u4e0d\u5e94\u8be5\u770b\u5230\u3002\u6240\u4ee5\u6709\u4e00\u4e2a\u5217\u8868 m_ids&#xff0c;\u7528\u6765\u7ef4\u62a4 Read View \u751f\u6210\u65f6\u523b\u7cfb\u7edf\u6b63\u6d3b\u8dc3\u7684\u4e8b\u52a1 ID\u3002\u8fd9\u91cc\u5feb\u7167\u5230\u7684\u4e8b\u52a1 id \u4e00\u5b9a\u662f\u8fde\u7eed\u7684\u5417&#xff1f;\u56e0\u4e3a\u4e8b\u52a1\u7684\u6267\u884c\u662f\u8981\u65f6\u95f4\u7684&#xff0c;\u5148\u6765\u7684\u53ef\u80fd\u665a\u8d70&#xff0c;\u665a\u6765\u7684\u4e5f\u53ef\u80fd\u65e9\u8d70&#xff0c;\u6240\u4ee5\u5feb\u7167 id \u53ef\u80fd\u4e0d\u8fde\u7eed\u3002\u6240\u4ee5\u5f53\u6211\u4eec\u62ff\u7740 DB_TRX_ID \u5728 m_ids \u4e2d\u67e5\u627e\u7684\u65f6\u5019&#xff0c;\u53d1\u73b0\u4e0d\u5728\u5217\u8868\u4e2d\u5c31\u8bf4\u660e\u5728\u6211\u8fdb\u884c\u5feb\u7167\u7684\u65f6\u5019\u8be5\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u4e86&#xff0c;\u6240\u4ee5\u6211\u5e94\u8be5\u770b\u5230&#xff1b;\u5982\u679c\u5728&#xff0c;\u8bf4\u660e\u6211\u548c\u4f60\u90fd\u662f\u6d3b\u8dc3\u4e8b\u52a1\u5e76\u6ca1\u6709\u63d0\u4ea4&#xff0c;\u6240\u4ee5\u6211\u4eec\u4e0d\u5e94\u8be5\u770b\u5230\u3002<\/li>\n<p>\u6700\u540e\u6ce8\u610f&#xff1a;ReadView \u662f\u4e8b\u52a1\u53ef\u89c1\u6027\u7684\u4e00\u4e2a\u7c7b&#xff0c;\u4f46\u662f\u4e0d\u4ee3\u8868\u4e8b\u52a1\u521b\u5efa\u5c31\u4f1a\u521b\u5efa\u8fd9\u4e2a ReadView&#xff0c;\u800c\u662f\u5f53\u4e8b\u52a1\u9996\u6b21\u8fdb\u884c\u5feb\u7167\u8bfb\u7684\u65f6\u5019\u521b\u5efa\u3002<\/p>\n<hr \/>\n<h4>10. \u6574\u4f53\u6d41\u7a0b\u793a\u4f8b<\/h4>\n<p>\u5047\u8bbe\u5f53\u524d\u6709\u6761\u8bb0\u5f55&#xff1a;<\/p>\n<table>\n<tr>nameageDB_TRX_IDDB_ROW_IDDB_ROLL_PTR<\/tr>\n<tbody>\n<tr>\n<td>\u5f20\u4e09<\/td>\n<td>28<\/td>\n<td>null<\/td>\n<td>1<\/td>\n<td>null<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e8b\u52a1\u64cd\u4f5c&#xff1a;<\/p>\n<table>\n<tr>\u4e8b\u52a11 [id&#061;1]\u4e8b\u52a12 [id&#061;2]\u4e8b\u52a13 [id&#061;3]\u4e8b\u52a14 [id&#061;4]<\/tr>\n<tbody>\n<tr>\n<td>\u4e8b\u52a1\u5f00\u59cb<\/td>\n<td>\u4e8b\u52a1\u5f00\u59cb<\/td>\n<td>\u4e8b\u52a1\u5f00\u59cb<\/td>\n<td>\u4e8b\u52a1\u5f00\u59cb<\/td>\n<\/tr>\n<tr>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td>\u4fee\u6539\u4e14\u5df2\u63d0\u4ea4<\/td>\n<\/tr>\n<tr>\n<td>\u8fdb\u884c\u4e2d<\/td>\n<td>\u5feb\u7167\u8bfb<\/td>\n<td>\u8fdb\u884c\u4e2d<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e8b\u52a1 4&#xff1a;\u4fee\u6539 name&#xff08;\u5f20\u4e09&#xff09;\u53d8\u6210 name&#xff08;\u674e\u56db&#xff09;&#xff0c;\u5148\u7ed3\u675f\u3002\u5728\u5f53\u4e8b\u52a1 2 \u5bf9\u67d0\u884c\u6570\u636e\u6267\u884c\u4e86\u5feb\u7167\u8bfb\u65f6&#xff0c;\u6570\u636e\u5e93\u4e3a\u8be5\u884c\u6570\u636e\u751f\u6210\u4e00\u4e2a Read View \u8bfb\u89c6\u56fe\u3002<\/p>\n<p>\/\/ \u4e8b\u52a12\u7684 Read View<br \/>\nm_ids;          \/\/ 1,3<br \/>\nup_limit_id;    \/\/ 1<br \/>\nlow_limit_id;   \/\/ 4 &#043; 1 &#061; 5&#xff0c;\u539f\u56e0&#xff1a;ReadView\u751f\u6210\u65f6\u523b&#xff0c;\u7cfb\u7edf\u5c1a\u672a\u5206\u914d\u7684\u4e0b\u4e00\u4e2a\u4e8b\u52a1ID<br \/>\ncreator_trx_id  \/\/ 2<\/p>\n<p>\u4e8b\u52a1 2 \u5728\u5feb\u7167\u8bfb\u8be5\u884c\u8bb0\u5f55\u7684\u65f6\u5019&#xff0c;\u5c31\u4f1a\u62ff\u8be5\u884c\u8bb0\u5f55\u7684 DB_TRX_ID \u53bb\u8ddf up_limit_id\u3001low_limit_id \u548c\u6d3b\u8dc3\u4e8b\u52a1 ID \u5217\u8868&#xff08;trx_list&#xff09;\u8fdb\u884c\u6bd4\u8f83&#xff0c;\u5224\u65ad\u5f53\u524d\u4e8b\u52a1 2 \u80fd\u770b\u5230\u8be5\u8bb0\u5f55\u7684\u7248\u672c\u3002<\/p>\n<p>\/\/ \u4e8b\u52a12\u7684 Read View<br \/>\nm_ids;          \/\/ 1,3<br \/>\nup_limit_id;    \/\/ 1<br \/>\nlow_limit_id;   \/\/ 4 &#043; 1 &#061; 5<br \/>\ncreator_trx_id  \/\/ 2<\/p>\n<p>\/\/ \u4e8b\u52a14\u63d0\u4ea4\u7684\u8bb0\u5f55\u5bf9\u5e94\u7684\u4e8b\u52a1ID<br \/>\nDB_TRX_ID &#061; 4<\/p>\n<p>\/\/ \u6bd4\u8f83\u6b65\u9aa4<br \/>\nDB_TRX_ID&#xff08;4&#xff09; &lt; up_limit_id&#xff08;1&#xff09;?       \u4e0d\u5c0f\u4e8e&#xff0c;\u4e0b\u4e00\u6b65<br \/>\nDB_TRX_ID&#xff08;4&#xff09; &gt;&#061; low_limit_id&#xff08;5&#xff09;?     \u4e0d\u5927\u4e8e&#xff0c;\u4e0b\u4e00\u6b65<br \/>\nm_ids.contains(DB_TRX_ID)?               \u4e0d\u5305\u542b&#xff0c;\u8bf4\u660e\u4e8b\u52a14\u4e0d\u5728\u5f53\u524d\u7684\u6d3b\u8dc3\u4e8b\u52a1\u4e2d<\/p>\n<p>\/\/ \u7ed3\u8bba<br \/>\n\u6545\u4e8b\u52a14\u7684\u66f4\u6539\u5e94\u8be5\u770b\u5230\u3002\u6240\u4ee5\u4e8b\u52a12\u80fd\u8bfb\u5230\u7684\u6700\u65b0\u6570\u636e\u8bb0\u5f55\u662f\u4e8b\u52a14\u6240\u63d0\u4ea4\u7684\u7248\u672c&#xff0c;<br \/>\n\u800c\u4e8b\u52a14\u63d0\u4ea4\u7684\u7248\u672c\u4e5f\u662f\u5168\u5c40\u89d2\u5ea6\u4e0a\u6700\u65b0\u7684\u7248\u672c\u3002<\/p>\n<hr \/>\n<h4>11. RR \u4e0e RC \u7684\u672c\u8d28\u533a\u522b<\/h4>\n<h5>\u5f53\u524d\u8bfb\u548c\u5feb\u7167\u8bfb\u5728 RR \u7ea7\u522b\u4e0b\u7684\u533a\u522b<\/h5>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u7ecf\u8fc7\u6d4b\u8bd5\u662f\u5b8c\u5168\u6ca1\u6709\u95ee\u9898\u7684\u3002select * from user lock in share mode \u4ee5\u52a0\u5171\u4eab\u9501\u65b9\u5f0f\u8fdb\u884c\u8bfb\u53d6&#xff0c;\u5bf9\u5e94\u7684\u5c31\u662f\u5f53\u524d\u8bfb&#xff0c;\u6b64\u5904\u53ea\u4f5c\u4e3a\u6d4b\u8bd5\u4f7f\u7528\u3002\u56e0\u6b64\u4e0d\u5e26 lock in share mode \u5c31\u662f\u5feb\u7167\u8bfb\u3002<\/p>\n<p>\u6d4b\u8bd5\u8868&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u8bbe\u7f6eRR\u6a21\u5f0f\u4e0b\u6d4b\u8bd5<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">set<\/span> <span class=\"token keyword\">global<\/span> <span class=\"token keyword\">transaction<\/span> <span class=\"token keyword\">isolation<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">REPEATABLE<\/span> <span class=\"token keyword\">READ<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">rows<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">&#8212; \u91cd\u542f\u7ec8\u7aef<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">select<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> &#064;<span class=\"token variable\">&#064;tx_isolation<\/span>  <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token operator\">|<\/span> <span class=\"token keyword\">REPEATABLE<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token keyword\">READ<\/span> <span class=\"token operator\">|<\/span><br \/>\n<span class=\"token operator\">&#043;<\/span><span class=\"token comment\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/span><br \/>\n<span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> <span class=\"token operator\">in<\/span> <span class=\"token keyword\">set<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> warning <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u4f9d\u65e7\u7528\u4e4b\u524d\u7684\u8868<\/span><br \/>\n<span class=\"token keyword\">create<\/span> <span class=\"token keyword\">table<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token operator\">not<\/span> <span class=\"token keyword\">exists<\/span> account<span class=\"token punctuation\">(<\/span><br \/>\n    id <span class=\"token keyword\">int<\/span> <span class=\"token keyword\">primary<\/span> <span class=\"token keyword\">key<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    name <span class=\"token keyword\">varchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token string\">&#039;&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    blance <span class=\"token keyword\">decimal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">not<\/span> <span class=\"token boolean\">null<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token number\">0.0<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">ENGINE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">InnoDB<\/span> <span class=\"token keyword\">DEFAULT<\/span> <span class=\"token keyword\">CHARSET<\/span><span class=\"token operator\">&#061;<\/span>UTF8<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u63d2\u5165\u4e00\u6761\u8bb0\u5f55&#xff0c;\u7528\u6765\u6d4b\u8bd5<\/span><br \/>\nmysql<span class=\"token operator\">&gt;<\/span> <span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">15<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u9ec4\u84c9&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nQuery OK<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">row<\/span> affected <span class=\"token punctuation\">(<\/span><span class=\"token number\">0.00<\/span> sec<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6d4b\u8bd5\u7528\u4f8b1 &#8211; \u88681&#xff1a;<\/p>\n<table>\n<tr>\u4e8b\u52a1A\u64cd\u4f5c\u4e8b\u52a1A\u63cf\u8ff0\u4e8b\u52a1B\u63cf\u8ff0\u4e8b\u52a1B\u64cd\u4f5c<\/tr>\n<tbody>\n<tr>\n<td>begin<\/td>\n<td>A\u5f00\u542f\u4e8b\u52a1<\/td>\n<td>B\u5f00\u542f\u4e8b\u52a1<\/td>\n<td>begin<\/td>\n<\/tr>\n<tr>\n<td>select * from user<\/td>\n<td>A\u5feb\u7167\u8bfb&#xff08;\u65e0\u5f71\u54cd&#xff09;\u67e5\u8be2<\/td>\n<td>B\u5feb\u7167\u8bfb\u67e5\u8be2<\/td>\n<td>select * from user<\/td>\n<\/tr>\n<tr>\n<td>update user set age&#061;18 where id&#061;1;<\/td>\n<td>A\u66f4\u65b0age&#061;18<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<\/tr>\n<tr>\n<td>commit<\/td>\n<td>A\u63d0\u4ea4\u4e8b\u52a1<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>B select \u5feb\u7167\u8bfb&#xff0c;\u6ca1\u6709\u8bfb\u5230 age&#061;18<\/td>\n<td>select * from user&#xff08;\u56e0\u4e3a\u9694\u79bb\u7ea7\u522b\u662fRR&#xff0c;\u6240\u4ee5\u5728\u4e8b\u52a1B\u6ca1\u6709\u63d0\u4ea4\u524d\u770b\u4e0d\u5230A&#xff09;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>B select lock in share mode \u5f53\u524d\u8bfb&#xff0c;\u8bfb\u5230 age&#061;18<\/td>\n<td>select * from user lock in share mode<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6d4b\u8bd5\u7528\u4f8b2 &#8211; \u88682&#xff1a;<\/p>\n<table>\n<tr>\u4e8b\u52a1A\u64cd\u4f5c\u4e8b\u52a1A\u63cf\u8ff0\u4e8b\u52a1B\u63cf\u8ff0\u4e8b\u52a1B\u64cd\u4f5c<\/tr>\n<tbody>\n<tr>\n<td>begin<\/td>\n<td>A\u5f00\u542f\u4e8b\u52a1<\/td>\n<td>B\u5f00\u542f\u4e8b\u52a1<\/td>\n<td>begin<\/td>\n<\/tr>\n<tr>\n<td>select * from user<\/td>\n<td>A\u5feb\u7167\u8bfb&#xff0c;\u67e5\u5230age&#061;18<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<\/tr>\n<tr>\n<td>update user set age&#061;28 where id&#061;1;<\/td>\n<td>A\u66f4\u65b0age&#061;28<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<\/tr>\n<tr>\n<td>commit<\/td>\n<td>A\u63d0\u4ea4\u4e8b\u52a1<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<td>B\u4ec0\u4e48\u4e5f\u4e0d\u505a<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>B select \u5feb\u7167\u8bfb age&#061;28<\/td>\n<td>select * from user<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>B select lock in share mode \u5f53\u524d\u8bfb age&#061;28<\/td>\n<td>select * from user lock in share mode<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7528\u4f8b 1 \u4e0e\u7528\u4f8b 2 \u552f\u4e00\u533a\u522b\u4ec5\u4ec5\u662f&#xff1a;\u8868 1 \u7684\u4e8b\u52a1 B \u5728\u4e8b\u52a1 A \u4fee\u6539 age \u524d\u5feb\u7167\u8bfb\u8fc7\u4e00\u6b21 age \u6570\u636e&#xff0c;\u800c\u8868 2 \u7684\u4e8b\u52a1 B \u5728\u4e8b\u52a1 A \u4fee\u6539 age \u524d\u6ca1\u6709\u8fdb\u884c\u8fc7\u5feb\u7167\u8bfb\u3002<\/p>\n<p>\u7ed3\u8bba&#xff1a;<\/p>\n<p>\u7528\u4f8b 1 \u4e8b\u52a1 B \u5728\u4e8b\u52a1 A \u4e4b\u524d\u5c31\u8fdb\u884c\u4e86\u5feb\u7167\u8bfb&#xff0c;\u5c31\u521b\u5efa\u4e86\u5feb\u7167&#xff0c;\u6240\u4ee5\u81ea\u7136\u8bfb\u4e0d\u5230\u4e8b\u52a1 A \u7684\u64cd\u4f5c\u3002\u4f46\u662f\u7528\u4f8b 2 \u662f\u5728\u4e8b\u52a1 A \u63d0\u4ea4\u540e\u624d\u5feb\u7167\u8bfb&#xff0c;\u6240\u4ee5\u80fd\u770b\u5230\u3002<\/p>\n<p>\u4e8b\u52a1\u4e2d\u5feb\u7167\u8bfb\u7684\u7ed3\u679c\u662f\u975e\u5e38\u4f9d\u8d56\u8be5\u4e8b\u52a1\u9996\u6b21\u51fa\u73b0\u5feb\u7167\u8bfb\u7684\u5730\u65b9&#xff0c;\u5373\u67d0\u4e2a\u4e8b\u52a1\u4e2d\u9996\u6b21\u51fa\u73b0\u5feb\u7167\u8bfb\u51b3\u5b9a\u8be5\u4e8b\u52a1\u540e\u7eed\u5feb\u7167\u8bfb\u7ed3\u679c\u7684\u80fd\u529b&#xff0c;delete \u540c\u6837\u5982\u6b64\u3002\u6240\u4ee5 Read View \u5f62\u6210\u65f6\u673a\u7684\u4e0d\u540c\u4f1a\u5f71\u54cd\u4e8b\u52a1\u7684\u53ef\u89c1\u6027\u3002<\/p>\n<hr \/>\n<h5>RR \u4e0e RC \u7684\u672c\u8d28\u533a\u522b&#xff08;\u6b63\u5f0f&#xff09;<\/h5>\n<p>\u6b63\u662f Read View \u751f\u6210\u65f6\u673a\u7684\u4e0d\u540c&#xff0c;\u4ece\u800c\u9020\u6210 RC\u3001RR \u7ea7\u522b\u4e0b\u5feb\u7167\u8bfb\u7684\u7ed3\u679c\u7684\u4e0d\u540c\u3002<\/p>\n<ul>\n<li>\u5728 RR \u7ea7\u522b\u4e0b&#xff0c;\u67d0\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u6761\u8bb0\u5f55\u7684\u7b2c\u4e00\u6b21\u5feb\u7167\u8bfb\u4f1a\u521b\u5efa\u4e00\u4e2a\u5feb\u7167\u53ca Read View&#xff0c;\u5c06\u5f53\u524d\u7cfb\u7edf\u6d3b\u8dc3\u7684\u5176\u4ed6\u4e8b\u52a1\u8bb0\u5f55\u8d77\u6765\u3002\u6b64\u540e\u5728\u8c03\u7528\u5feb\u7167\u8bfb\u7684\u65f6\u5019&#xff0c;\u8fd8\u662f\u4f7f\u7528\u7684\u662f\u540c\u4e00\u4e2a Read View&#xff0c;\u6240\u4ee5\u53ea\u8981\u5f53\u524d\u4e8b\u52a1\u5728\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u66f4\u65b0\u4e4b\u524d\u4f7f\u7528\u8fc7\u5feb\u7167\u8bfb&#xff0c;\u90a3\u4e48\u4e4b\u540e\u7684\u5feb\u7167\u8bfb\u4f7f\u7528\u7684\u90fd\u662f\u540c\u4e00\u4e2a Read View&#xff0c;\u6240\u4ee5\u5bf9\u4e4b\u540e\u7684\u4fee\u6539\u4e0d\u53ef\u89c1\u3002\u6240\u4ee5 RR \u7684\u53ef\u89c1\u6027\u5728\u7b2c\u4e00\u6b21\u5feb\u7167\u8bfb\u65f6\u521b\u5efa Read View \u7684\u65f6\u5019\u5c31\u4e0d\u4f1a\u53d8\u4e86\u3002<\/li>\n<li>\u5373 RR \u7ea7\u522b\u4e0b&#xff0c;\u5feb\u7167\u8bfb\u751f\u6210 Read View \u65f6&#xff0c;Read View \u4f1a\u8bb0\u5f55\u6b64\u65f6\u6240\u6709\u5176\u4ed6\u6d3b\u52a8\u4e8b\u52a1\u7684\u5feb\u7167&#xff0c;\u8fd9\u4e9b\u4e8b\u52a1\u7684\u4fee\u6539\u5bf9\u4e8e\u5f53\u524d\u4e8b\u52a1\u90fd\u662f\u4e0d\u53ef\u89c1\u7684\u3002\u800c\u65e9\u4e8e Read View \u521b\u5efa\u7684\u4e8b\u52a1\u6240\u505a\u7684\u4fee\u6539\u5747\u662f\u53ef\u89c1\u3002<\/li>\n<li>\u5728 RC \u7ea7\u522b\u4e0b&#xff0c;\u4e8b\u52a1\u4e2d\u6bcf\u6b21\u5feb\u7167\u8bfb\u90fd\u4f1a\u91cd\u65b0\u751f\u6210\u4e00\u4e2a\u5feb\u7167\u548c Read View&#xff0c;\u8fd9\u5c31\u662f\u6211\u4eec\u5728 RC \u7ea7\u522b\u4e0b\u7684\u4e8b\u52a1\u4e2d\u53ef\u4ee5\u770b\u5230\u522b\u7684\u4e8b\u52a1\u63d0\u4ea4\u7684\u66f4\u65b0\u7684\u539f\u56e0\u3002<\/li>\n<\/ul>\n<p>\u603b\u4e4b&#xff1a;\u5728 RC \u9694\u79bb\u7ea7\u522b\u4e0b&#xff0c;\u662f\u6bcf\u4e2a\u5feb\u7167\u8bfb\u90fd\u4f1a\u751f\u6210\u5e76\u83b7\u53d6\u6700\u65b0\u7684 Read View&#xff1b;\u800c\u5728 RR \u9694\u79bb\u7ea7\u522b\u4e0b&#xff0c;\u5219\u662f\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5feb\u7167\u8bfb\u624d\u4f1a\u521b\u5efa Read View&#xff0c;\u4e4b\u540e\u7684\u5feb\u7167\u8bfb\u83b7\u53d6\u7684\u90fd\u662f\u540c\u4e00\u4e2a Read View\u3002<\/p>\n<p>\u6b63\u662f RC \u6bcf\u6b21\u5feb\u7167\u8bfb\u90fd\u4f1a\u5f62\u6210 Read View&#xff0c;\u6240\u4ee5 RC 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