{"id":65646,"date":"2026-01-25T14:08:33","date_gmt":"2026-01-25T06:08:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/65646.html"},"modified":"2026-01-25T14:08:33","modified_gmt":"2026-01-25T06:08:33","slug":"javaweb%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e8%bf%9b%e9%98%b6%ef%bc%88mysql%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%af%a2%e5%8f%8a%e6%a1%88%e4%be%8b%e5%88%86%e6%9e%90%ef%bc%8c%e4%ba%8b%e5%8a%a1%ef%bc%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/65646.html","title":{"rendered":"javaWeb\u4ece\u5165\u95e8\u5230\u8fdb\u9636\uff08MYSQL\u591a\u8868\u67e5\u8be2\u53ca\u6848\u4f8b\u5206\u6790\uff0c\u4e8b\u52a1\uff0c\u7d22\u5f15\uff09"},"content":{"rendered":"

\u591a\u8868\u67e5\u8be2<\/h2>\n

:\u6307\u4ece\u591a\u5f20\u8868\u4e2d\u67e5\u8be2\u6570\u636e<\/p>\n

\n\u7b1b\u5361\u5c14\u79ef:\u7b1b\u5361\u5c14\u4e58\u79ef\u662f\u6307\u5728\u6570\u5b66\u4e2d，\u4e24\u4e2a\u96c6\u5408(A\u96c6\u5408\u548cB\u96c6\u5408)\u7684\u6240\u6709\u7ec4\u5408\u60c5\u51b5\u3002(\u5728\u591a\u8868\u67e5\u8be2\u65f6，\u9700\u8981\u6d88\u9664\u65e0\u6548\u7684\u7b1b\u5361\u5c14\u79ef)<\/p>\n

\u5177\u4f53\u8be6\u89e3：<\/p>\n

\u6211\u4eec\u5728\u67e5\u8be2\u591a\u5f20\u8868\u7684\u65f6\u5019，\u4f1a\u4ea7\u751f\u5f88\u591a\u4e0d\u9700\u8981\u6216\u8005\u8bf4\u662f\u4e0d\u5b58\u5728\u7684\u6570\u636e，\u8fd9\u4e2d\u73b0\u8c61\u5c31\u6210\u4e3a\u7b1b\u5361\u5c14\u79ef，\u8fd9\u65f6\u6211\u4eec\u9700\u8981\u5728\u67e5\u8be2\u8868\u7684\u540e\u9762\u901a\u8fc7where\u5173\u952e\u5b57\u52a0\u4e0a\u5bf9\u5e94\u7684\u6761\u4ef6\u6765\u7b5b\u9009\u51fa\u6211\u4eec\u771f\u6b63\u9700\u8981\u7684，\u5408\u7406\u7684\u6570\u636e\u3002\u6bd4\u5982\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868\u4e4b\u95f4\u7684\u5bf9\u5e94\u5173\u7cfb，\u4e00\u4e2a\u5458\u5de5\u5bf9\u5e94\u4e00\u4e2a\u90e8\u95e8，\u4f46\u6211\u4eec\u540c\u65f6\u67e5\u8be2\u65f6，\u4f1a\u51fa\u73b0\u4e00\u4e2a\u5458\u5de5\u5bf9\u5e94\u6240\u6709\u90e8\u95e8，\u8fd9\u65f6\u6211\u4eec\u901a\u8fc7where\u5173\u952e\u5b57\u5c06\u5458\u5de5\u7684id\u5b57\u6bb5\u4e0e\u90e8\u95e8\u8868\u7684id\u5b57\u6bb5\u8fdb\u884c\u5bf9\u5e94，\u8fd9\u65f6\u5c31\u5b8c\u6210\u4e86\u7b5b\u9009\u3002<\/p>\n

<\/h4>\n

\u8fde\u63a5\u67e5\u8be2：<\/h3>\n

\u5185\u8fde\u63a5：<\/h4>\n

\"\"<\/p>\n

\u67e5\u8be2\u4e24\u5f20\u8868\u7684\u4ea4\u96c6\u90e8\u5206\u3002<\/p>\n

\u9690\u5f0f\u5185\u8fde\u63a5:select \u5b57\u6bb5\u5217\u8868from \u88681,\u88682 where\u6761\u4ef6…;
\n\u663e\u5f0f\u5185\u8fde\u63a5:select \u5b57\u6bb5\u5217\u8868 from \u88681[inner]join \u88682 on \u8fde\u63a5\u6761\u4ef6…;<\/p>\n

\"\"<\/p>\n

\u7ed9\u591a\u8868\u8d77\u522b\u540d<\/p>\n

\"\"<\/p>\n

\u76f4\u63a5\u5728\u8868\u660e\u540e\u7a7a\u683c\u8d77\u540d，\u7528\u65b0\u7684\u540d\u5b57\u66ff\u4ee3\u8c03\u7528\u3002<\/p>\n

<\/h4>\n

\u5916\u8fde\u63a5<\/h4>\n

\u5de6\u5916\u8fde\u63a5:select \u5b57\u6bb5\u5217\u8868from \u88681 left[outer]join \u88682 on \u8fde\u6761\u4ef6…;<\/p>\n

\u5de6\u534a\u90e8\u5206\u7684\u5168\u90e8\u6570\u636e，\u5305\u62ec\u91cd\u53e0\u7684\u90e8\u5206<\/p>\n

select e.name,d.name from tb_emp e left join tb_dept d on e.dept_id=d.id;<\/p>\n

\"\"<\/p>\n

\"\"
\n\u53f3\u5916\u8fde\u63a5:select \u5b57\u6bb5\u5217\u8868 from \u88681 right[outer]join\u88682 on \u8fde\u63a5\u6761\u4ef6…;<\/p>\n

\"\"<\/p>\n

\u5b50\u67e5\u8be2<\/h3>\n

\n\u6982\u8ff0
\n\u4ecb\u7ecd:SQL\u8bed\u53e5\u4e2d\u5d4c\u5957select\u8bed\u53e5，\u79f0\u4e3a\u5d4c\u5957\u67e5\u8be2，\u53c8\u79f0\u5b50\u67e5\u8be2\u3002
\n\u5f62\u5f0f: select * from t1 where columnl = (select columnl from t2 … );\u5b50\u67e5\u8be2\u5916\u90e8\u7684\u8bed\u53e5\u53ef\u4ee5\u662finsert\/update\/delete\/select \u7684\u4efb\u4f55\u4e00\u4e2a，\u6700\u5e38\u89c1\u7684\u662f select\u3002<\/p>\n

\u5206\u7c7b
\n\u6807\u91cf\u5b50\u67e5\u8be2<\/h4>\n

\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u5355\u4e2a\u503c(\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u7b49)，\u6700\u7b80\u5355\u7684\u5f62\u5f0f
\n\u5e38\u7528\u7684\u64cd\u4f5c\u7b26:= <> > >=\u00a0 \u00a0<\u00a0 \u00a0 <=<\/p>\n

\n\u5217\u5b50\u67e5\u8be2<\/h4>\n

\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u5217(\u53ef\u4ee5\u662f\u591a\u884c)
\n\u5e38\u7528\u7684\u64cd\u4f5c\u7b26:in\u3001notin\u7b49<\/p>\n

\n\u884c\u5b50\u67e5\u8be2<\/h4>\n

:\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u4e3a\u4e00\u884c<\/p>\n

\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u884c(\u53ef\u4ee5\u662f\u591a\u5217)\u3002\u5e38\u7528\u7684\u64cd\u4f5c\u7b26:=\u3001<>\u3001in\u3001not in<\/p>\n

\n\u8868\u5b50\u67e5\u8be2<\/h4>\n

:\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u4e3a\u591a\u884c\u591a\u5217<\/p>\n<\/p>\n

\u4e8b\u52a1:<\/h3>\n

\u524d\u8a00：\u5f53\u6574\u4e2a\u90e8\u95e8\u89e3\u6563\u65f6，\u90a3\u4e48\u90e8\u95e8\u5e95\u4e0b\u7684\u5458\u5de5\u90fd\u4f1a\u88ab\u5220\u9664\u3002\u6240\u4ee5\u6211\u4eec\u6267\u884cSQL\u8bed\u53e5\u65f6\u9700\u8981\u5148\u5220\u9664\u90e8\u95e8，\u5728\u5220\u9664\u5bf9\u5e94\u90e8\u95e8\u4e0b\u7684\u5458\u5de5，\u4f46\u662f\u5982\u679c\u5458\u5de5\u5220\u9664\u56e0\u4e3a\u64cd\u4f5c\u4e0d\u5f53\u5931\u8d25\u4e86，\u5c31\u4f1a\u9020\u6210\u6570\u636e\u7684\u4e0d\u4e00\u81f4\u6027\u3002\u8fd9\u662f\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7 \u4e8b\u52a1\u6765\u89e3\u51b3\u3002<\/p>\n<\/p>\n

\u6982\u5ff5：<\/p>\n

\u4e8b\u52a1\u662f\u4e00\u7ec4\u64cd\u4f5c\u7684\u96c6\u5408，\u5b83\u662f\u4e00\u4e2a\u4e0d\u53ef\u5206\u5272\u7684\u5de5\u4f5c\u5355\u4f4d\u3002\u4e8b\u52a1\u4f1a\u628a\u6240\u6709\u7684\u64cd\u4f5c\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\u4e00\u8d77\u5411\u7cfb\u7edf\u63d0\u4ea4\u6216\u64a4\u9500\u64cd\u4f5c\u8bf7\u6c42，\u5373\u8fd9\u4e9b<\/span>
\n\u64cd\u4f5c\u8981\u4e48\u540c\u65f6\u6210\u529f，\u8981\u4e48\u540c\u65f6\u5931\u8d25\u3002<\/span><\/span><\/p>\n

\u6ce8\u610f\u4e8b\u9879
\n\u9ed8\u8ba4MySQL\u7684\u4e8b\u52a1\u662f\u81ea\u52a8\u63d0\u4ea4\u7684，\u4e5f\u5c31\u662f\u8bf4，\u5f53\u6267\u884c\u4e00\u6761DML\u8bed\u53e5，MySQL\u4f1a\u7acb\u5373\u9690\u5f0f\u7684\u63d0\u4ea4\u4e8b\u52a1\u3002\u56e0\u6b64\u6211\u4eec\u9700\u8981\u628a\u9ed8\u8ba4\u7684\u4e24\u4e2a\u4e8b\u52a1\u7ec4\u6210\u4e00\u4e2a\u4e8b\u52a1，\u4ece\u800c\u5b9e\u73b0\u4e8b\u52a1\u7684\u529f\u80fd\u3002<\/p>\n

\u64cd\u4f5c：<\/p>\n

\u4e8b\u52a1\u63a7\u5236
\n\u5f00\u542f\u4e8b\u52a1:start transaction;\/ begin;<\/span>
\n\u63d0\u4ea4\u4e8b\u52a1:commit;<\/span>
\n\u56de\u6eda\u4e8b\u52a1:rollback;\u5f53\u53ea\u6709\u4e00\u4e2a\u4e8b\u52a1\u6267\u884c\u6210\u529f\u65f6，\u800c\u53e6\u4e00\u4e2a\u5931\u8d25\u65f6，\u6267\u884c\u56de\u6eda\u4e8b\u52a1，\u628a\u6570\u636e\u56de\u590d\u539f\u6837，\u4ece\u65b0\u4e66\u5199\u6267\u884c\u3002<\/span><\/p>\n

\u4e8b\u52a1\u7684\u56db\u5927\u7279\u6027：ACID<\/h3>\n

\u539f\u5b50\u6027<\/h4>\n

\n\u4e8b\u52a1\u662f\u4e0d\u53ef\u5206\u5272\u7684\u6700\u5c0f\u5355\u5143，\u8981\u4e48\u5168\u90e8\u6210\u529f，\u8981\u4e48\u5168\u90e8\u5931\u8d25<\/p>\n

\n\u4e00\u81f4\u6027<\/h4>\n

\n\u4e8b\u52a1\u5b8c\u6210\u65f6，\u5fc5\u987b\u4f7f\u6240\u6709\u7684\u6570\u636e\u90fd\u4fdd\u6301\u4e00\u81f4\u72b6\u6001<\/p>\n

\n\u9694\u79bb\u6027<\/h4>\n

\n\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u7684\u9694\u79bb\u673a\u5236，\u4fdd\u8bc1\u4e8b\u52a1\u5728\u4e0d\u53d7\u5916\u90e8\u5e76\u53d1\u64cd\u4f5c\u5f71\u54cd
\n\u7684\u72ec\u7acb\u73af\u5883\u4e0b\u8fd0\u884c<\/p>\n

\u6301\u4e45\u6027<\/h4>\n

\n\u4e8b\u52a1\u4e00\u65e6\u63d0\u4ea4\u6216\u56de\u6eda，\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u7684\u6539\u53d8\u5c31\u662f\u6c38\u4e45\u7684<\/p>\n<\/p>\n

\u7d22\u5f15：<\/p>\n

\u7d22\u5f15\u662f\u6570\u636e\u5e93\u4f18\u5316\u7684\u4e00\u79cd\u65b9\u5f0f，\u5f53\u6570\u636e\u5e93\u6570\u636e\u91cf\u975e\u5e38\u5927\u65f6，\u6211\u4eec\u901a\u8fc7\u6b63\u5e38\u64cd\u4f5c\u67e5\u8be2\u6570\u636e\u65f6\u5c31\u4f1a\u663e\u7684\u975e\u5e38\u7684\u4f4e\u6548，\u800c\u6211\u4eec\u901a\u8fc7\u7ed9\u6570\u636e\u6dfb\u52a0\u7d22\u5f15，\u4e4b\u540e\u901a\u8fc7\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u6211\u4eec\u60f3\u8981\u7684\u6570\u636e，\u5c31\u4f1a\u663e\u7684\u975e\u5e38\u8fc5\u901f，\u901f\u5ea6\u6548\u7387\u6210\u51e0\u4f55\u7684\u5f0f\u7684\u589e\u957f\u3002<\/p>\n

\u7d22\u5f15\u662f\u5e2e\u52a9\u6570\u636e\u5e93\u9ad8\u6548\u83b7\u53d6\u6570\u636e\u7684\u6570\u636e\u7ed3\u6784<\/span><\/p>\n<\/p>\n

\u4f18\u70b9<\/p>\n

\n\u63d0\u9ad8\u6570\u636e\u67e5\u8be2\u7684\u6548\u7387，\u964d\u4f4e\u6570\u636e\u5e93\u7684I0\u6210\u672c\u3002
\n\u901a\u8fc7\u7d22\u5f15\u5217\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u5e8f，\u964d\u4f4e\u6570\u636e\u6392\u5e8f\u7684\u6210\u672c，
\n\u964d\u4f4eCPU\u6d88\u8017\u3002<\/p>\n

\n\u7f3a\u70b9
\n\u7d22\u5f15\u4f1a\u5360\u7528\u5b58\u50a8\u7a7a\u95f4\u3002
\n\u7d22\u5230\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u6548\u7387，\u540c\u65f6\u5374\u4e5f\u964d\u4f4e\u4e86insert\u3001
\nupdate\u3001delete\u7684\u6548\u7387\u3002<\/p>\n

\u7d22\u5f15\u7ed3\u6784：B +Tree<\/span><\/p>\n

\u6bcf\u4e00\u4e2a\u8282\u70b9，\u53ef\u4ee5\u5b58\u50a8\u591a\u4e2akey(\u6709n\u4e2akey，\u5c31\u6709n\u4e2a\u6307\u9488)<\/span>
\n\u6240\u6709\u7684\u6570\u636e\u90fd\u5b58\u50a8\u5728\u53f6\u5b50\u8282\u70b9，\u975e\u53f6\u5b50\u8282\u70b9\u4ec5\u7528\u4e8e\u7d22\u5f15\u6570\u636e\u3002<\/span>
\n\u53f6\u5b50\u8282\u70b9\u5f62\u6210\u4e86\u4e00\u9897\u53cc\u5411\u94fe\u8868，\u4fbf\u4e8e\u6570\u636e\u7684\u6392\u5e8f\u53ca\u533a\u95f4\u8303\u56f4\u67e5\u8be2\u3002<\/span><\/span><\/p>\n

\u8bed\u6cd5
\n\u521b\u5efa\u7d22\u5f15
\ncreate[unique]index\u7d22\u5f15\u540d on\u8868\u540d(\u5b57\u6bb5\u540d….);
\n\u67e5\u770b\u7d22\u5f15
\nshow index from \u8868\u540d;
\n\u5220\u9664\u7d22\u5f15
\ndrop index \u7d22\u540d on \u8868\u540d;<\/p>\n

\u6ce8\u610f\u4e8b\u9879
\n\u4e3b\u952e\u5b57\u6bb5，\u5728\u5efa\u8868\u65f6，\u4f1a\u81ea\u52a8\u521b\u5efa\u4e3b\u952e\u7d22\u5f15\u3002
\n\u6dfb\u52a0\u552f\u4e00\u7ea6\u675f\u65f6，\u6570\u636e\u5e93\u5b9e\u9645\u4e0a\u4f1a\u6dfb\u52a0\u552f\u4e00\u7d22\u5f15\u3002<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

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