{"id":104895,"date":"2026-09-13T10:57:25","date_gmt":"2026-09-13T02:57:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/104895.html"},"modified":"2026-09-13T10:57:25","modified_gmt":"2026-09-13T02:57:25","slug":"orm-%e9%80%9a%e7%94%a8%e5%8e%9f%e7%90%86%e4%b8%8e%e9%98%bb%e6%8a%97%e5%a4%b1%e9%85%8d%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/104895.html","title":{"rendered":"ORM \u901a\u7528\u539f\u7406\u4e0e\u963b\u6297\u5931\u914d\u8be6\u89e3"},"content":{"rendered":"<h2>ORM \u901a\u7528\u539f\u7406\u4e0e\u963b\u6297\u5931\u914d\u8be6\u89e3<\/h2>\n<p>\u9002\u7528\u7248\u672c&#xff1a;\u8de8\u6846\u67b6\u901a\u7528\u77e5\u8bc6&#xff08;\u793a\u4f8b\u4ee5 JPA 3.1 \/ Hibernate 6.x \/ MyBatis 3.5.x \u4f50\u8bc1&#xff09; \u8bf4\u660e&#xff1a;\u672c\u7bc7\u53ea\u8bb2\u8de8\u6846\u67b6\u901a\u7528\u539f\u7406<\/p>\n<hr \/>\n<h3>\u76ee\u5f55<\/h3>\n<ul>\n<li>\u4e00\u3001\u963b\u6297\u5931\u914d\u5168\u666f<\/li>\n<li>\u4e8c\u3001ORM \u6a21\u5f0f\u8c31\u7cfb<\/li>\n<li>\u4e09\u3001\u5bf9\u8c61\u72b6\u6001\u4e0e\u8eab\u4efd\u7ba1\u7406<\/li>\n<li>\u56db\u3001\u5173\u8054\u4e0e\u7ea7\u8054<\/li>\n<li>\u4e94\u3001\u61d2\u52a0\u8f7d\u4e0e N&#043;1<\/li>\n<li>\u516d\u3001\u4e8b\u52a1\u8fb9\u754c<\/li>\n<li>\u4e03\u3001\u603b\u7ed3<\/li>\n<li>\u516b\u3001\u5e38\u89c1\u9ad8\u9891\u9762\u8bd5\u9898<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e00\u3001\u963b\u6297\u5931\u914d\u5168\u666f<\/h3>\n<h4>1.1 \u4e24\u4e2a\u4e16\u754c\u7684\u8303\u5f0f\u5dee\u5f02<\/h4>\n<p>\u201c\u963b\u6297\u5931\u914d\u201d&#xff08;Impedance Mismatch&#xff0c;\u501f\u81ea\u7535\u8def\u5b66&#xff09;\u6307&#xff1a;\u9762\u5411\u5bf9\u8c61\u6a21\u578b\u4e0e\u5173\u7cfb\u6570\u636e\u5e93\u6a21\u578b\u5728\u8303\u5f0f\u4e0a\u6839\u672c\u4e0d\u540c&#xff0c;\u4e8c\u8005\u76f4\u63a5\u5bf9\u63a5\u5904\u5904\u522b\u626d\u3002<\/p>\n<p>\u5bf9\u8c61\u4e16\u754c                          \u5173\u7cfb\u4e16\u754c<br \/>\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500                   \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<br \/>\n\u56fe\u7ed3\u6784&#xff08;\u5bf9\u8c61\u4e92\u76f8\u5f15\u7528&#xff09;             \u6241\u5e73\u7684\u8868\u4e0e\u884c<br \/>\n\u5f15\u7528\u8868\u8fbe\u5173\u8054                       \u5916\u952e\u8868\u8fbe\u5173\u8054&#xff08;\u5355\u5411&#xff09;<br \/>\n\u884c\u4e3a\u5c01\u88c5\u5728\u65b9\u6cd5\u91cc                   \u884c\u53ea\u6709\u6570\u636e&#xff0c;\u6ca1\u6709\u884c\u4e3a<br \/>\n\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u8eab\u4efd                   \u4e3b\u952e\u5b9a\u4e49\u7684\u8eab\u4efd<br \/>\n\u4e00\u6b21\u64cd\u4f5c\u4e00\u4e2a\u5de5\u4f5c\u5355\u5143               \u72ec\u7acb\u7684\u4e8b\u52a1\u4e0e\u9694\u79bb\u7ea7\u522b<br \/>\n\u7ee7\u627f&#xff08;is-a&#xff09;                       \u6ca1\u6709\u539f\u751f\u7ee7\u627f&#xff08;\u9700\u6620\u5c04\u7b56\u7565&#xff09;<\/p>\n<p>ORM \u7684\u5168\u90e8\u5de5\u4f5c\u5c31\u662f\u5728\u8fd9\u4e24\u4e2a\u4e16\u754c\u4e4b\u95f4\u505a\u53cc\u5411\u7ffb\u8bd1\u2014\u2014\u800c\u4e14\u7ffb\u8bd1\u4e0d\u662f\u514d\u8d39\u7684&#xff0c;\u7406\u89e3\u4ee3\u4ef7\u5728\u54ea&#xff0c;\u662f\u9ad8\u6c34\u5e73\u4f7f\u7528 ORM \u7684\u524d\u63d0\u3002<\/p>\n<h4>1.2 \u4e94\u7c7b\u5931\u914d\u4e0e ORM \u7684\u89e3\u6cd5<\/h4>\n<table>\n<tr>\u5931\u914d\u7c7b\u578b\u5177\u4f53\u77db\u76feORM \u7684\u7ffb\u8bd1\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>\u7c92\u5ea6<\/td>\n<td>\u5bf9\u8c61\u53ef\u4efb\u610f\u5d4c\u5957\u7ec4\u5408&#xff0c;\u8868\u662f\u6241\u5e73\u7684<\/td>\n<td>\u5d4c\u5165\u5bf9\u8c61&#xff08;&#064;Embedded&#xff09;\u3001\u503c\u5bf9\u8c61\u6620\u5c04\u5230\u591a\u5217<\/td>\n<\/tr>\n<tr>\n<td>\u8eab\u4efd<\/td>\n<td>\u5bf9\u8c61\u7528\u5f15\u7528\u76f8\u7b49&#xff08;&#061;&#061;&#xff09;\/equals&#xff0c;\u884c\u7528\u4e3b\u952e<\/td>\n<td>\u4e3b\u952e\u6620\u5c04 &#043; \u5b9e\u4f53\u76f8\u7b49\u6027\u7ea6\u5b9a&#xff08;\u6309\u4e3b\u952e equals&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5173\u8054<\/td>\n<td>\u5bf9\u8c61\u5f15\u7528\u5929\u7136\u53cc\u5411\u53ef\u8fbe&#xff0c;\u5916\u952e\u662f\u5355\u5411\u7684<\/td>\n<td>\u53cc\u5411\u5173\u8054\u7531\u6846\u67b6\u5728\u5185\u5b58\u4e2d\u7ef4\u62a4\u4e24\u7aef\u4e00\u81f4\u6027<\/td>\n<\/tr>\n<tr>\n<td>\u884c\u4e3a<\/td>\n<td>\u5bf9\u8c61\u6709\u65b9\u6cd5&#xff0c;\u884c\u6ca1\u6709<\/td>\n<td>\u884c\u4e3a\u7559\u5728\u5bf9\u8c61&#xff0c;\u6570\u636e\u8bfb\u5199\u7531\u6846\u67b6\u4ee3\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u4e8b\u52a1\u5e76\u53d1<\/td>\n<td>\u7a0b\u5e8f\u6309\u4e1a\u52a1\u6b65\u9aa4\u64cd\u4f5c&#xff0c;\u6570\u636e\u5e93\u6309\u4e8b\u52a1\u9694\u79bb<\/td>\n<td>\u5de5\u4f5c\u5355\u5143\u6a21\u5f0f&#xff1a;\u6536\u96c6\u53d8\u66f4\u3001\u4e8b\u52a1\u63d0\u4ea4\u65f6\u7edf\u4e00\u843d\u5e93<\/td>\n<\/tr>\n<tr>\n<td>\u7ee7\u627f<\/td>\n<td>\u9762\u5411\u5bf9\u8c61\u6709\u7ee7\u627f&#xff0c;\u5173\u7cfb\u6a21\u578b\u6ca1\u6709<\/td>\n<td>\u4e09\u79cd\u7ee7\u627f\u6620\u5c04\u7b56\u7565&#xff08;\u5355\u8868\/\u8fde\u63a5\/\u6bcf\u7c7b\u4e00\u8868&#xff0c;02 \u7bc7&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>1.3 \u4ee3\u4ef7\u610f\u8bc6<\/h4>\n<p>\u7ffb\u8bd1\u7684\u4ee3\u4ef7\u96c6\u4e2d\u4f53\u73b0\u5728\u4e09\u5904&#xff0c;\u4e5f\u662f\u672c\u7bc7\u540e\u6587\u7684\u4f0f\u7b14&#xff1a;<\/p>\n<li>\u900f\u660e\u6027\u4ee3\u4ef7&#xff1a;ORM \u81ea\u52a8\u751f\u6210 SQL&#xff0c;\u4f60\u770b\u4e0d\u5230\u5b83&#xff0c;\u6027\u80fd\u95ee\u9898\u5f80\u5f80\u85cf\u5728\u8fd9\u91cc&#xff08;N&#043;1\u3001\u591a\u4f59\u5217&#xff09;&#xff1b;<\/li>\n<li>\u4e00\u81f4\u6027\u4ee3\u4ef7&#xff1a;\u5185\u5b58\u5bf9\u8c61\u56fe\u4e0e\u6570\u636e\u5e93\u884c\u662f\u4e24\u5957\u6570\u636e&#xff0c;\u72b6\u6001\u7ba1\u7406&#xff08;\u810f\u68c0\u67e5\u3001\u5237\u65b0\u65f6\u673a&#xff09;\u6210\u4e3a\u590d\u6742\u6027\u6765\u6e90&#xff1b;<\/li>\n<li>\u8bed\u4e49\u4ee3\u4ef7&#xff1a;\u5bf9\u8c61\u76f8\u7b49 \u2260 \u4e3b\u952e\u76f8\u7b49 \u2260 \u6570\u636e\u5e93\u76f8\u7b49&#xff0c;\u4e09\u8005\u6df7\u6dc6\u662f\u7ecf\u5178 bug \u6e90\u3002<\/li>\n<hr \/>\n<h3>\u4e8c\u3001ORM \u6a21\u5f0f\u8c31\u7cfb<\/h3>\n<p>\u6301\u4e45\u5c42\u65b9\u6848\u6309&#034;\u6846\u67b6\u66ff\u4f60\u7ba1\u591a\u5c11&#034;\u6392\u5217\u6210\u4e00\u4e2a\u8c31\u7cfb&#xff1a;<\/p>\n<table>\n<tr>\u6a21\u5f0f\u4ee3\u8868\u6846\u67b6\u7ba1\u4ec0\u4e48\u4f60\u7ba1\u4ec0\u4e48\u9002\u7528<\/tr>\n<tbody>\n<tr>\n<td>\u5168\u91cf ORM<\/td>\n<td>Hibernate \/ JPA<\/td>\n<td>\u5bf9\u8c61\u56fe\u3001\u72b6\u6001\u3001SQL \u751f\u6210\u3001\u7f13\u5b58<\/td>\n<td>\u6620\u5c04\u4e0e\u9886\u57df\u6a21\u578b\u8bbe\u8ba1<\/td>\n<td>\u9886\u57df\u6a21\u578b\u590d\u6742\u3001CRUD \u4e3a\u4e3b<\/td>\n<\/tr>\n<tr>\n<td>SQL \u6620\u5c04<\/td>\n<td>MyBatis<\/td>\n<td>\u7ed3\u679c\u6620\u5c04\u3001\u53c2\u6570\u7ed1\u5b9a<\/td>\n<td>\u5168\u90e8 SQL<\/td>\n<td>SQL \u590d\u6742\u3001\u9700\u7cbe\u7ec6\u63a7\u5236<\/td>\n<\/tr>\n<tr>\n<td>\u7c7b\u578b\u5b89\u5168 SQL \u6784\u5efa<\/td>\n<td>jOOQ<\/td>\n<td>SQL \u6784\u5efa\u4e0e\u7ed3\u679c\u6620\u5c04&#xff08;\u7f16\u8bd1\u671f\u6821\u9a8c&#xff09;<\/td>\n<td>SQL \u903b\u8f91&#xff08;\u7528\u4ee3\u7801\u5199&#xff09;<\/td>\n<td>\u590d\u6742\u67e5\u8be2 &#043; \u8981\u7c7b\u578b\u5b89\u5168<\/td>\n<\/tr>\n<tr>\n<td>Active Record<\/td>\n<td>Rails\u3001\u90e8\u5206\u8f7b\u91cf\u6846\u67b6<\/td>\n<td>\u5bf9\u8c61\u5373\u8868&#xff0c;\u81ea\u5e26 CRUD<\/td>\n<td>\u7ea6\u5b9a\u8868\u7ed3\u6784<\/td>\n<td>\u5feb\u901f\u539f\u578b\u3001\u8868\u7ed3\u6784\u7b80\u5355<\/td>\n<\/tr>\n<tr>\n<td>\u624b\u5199 DAO<\/td>\n<td>JdbcTemplate<\/td>\n<td>\u51e0\u4e4e\u4e0d\u7ba1<\/td>\n<td>\u4e00\u5207<\/td>\n<td>\u6781\u7b80\u573a\u666f\u3001\u6781\u81f4\u63a7\u5236<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8c31\u7cfb\u4e24\u7aef\u7684\u6743\u8861\u672c\u8d28&#xff1a;<\/p>\n<p>\u62bd\u8c61\u8d8a\u9ad8 \u2192 \u5f00\u53d1\u6548\u7387\u8d8a\u9ad8&#xff0c;\u4f46\u5931\u63a7\u98ce\u9669\u8d8a\u5927&#xff08;\u6027\u80fd\u3001SQL \u4e0d\u53ef\u89c1&#xff09;<br \/>\n\u62bd\u8c61\u8d8a\u4f4e \u2192 \u63a7\u5236\u529b\u8d8a\u5f3a&#xff0c;\u4f46\u91cd\u590d\u52b3\u52a8\u8d8a\u591a\u3001\u6a21\u578b\u8868\u8fbe\u529b\u8d8a\u5f31<\/p>\n<p>\u6ca1\u6709\u8c31\u7cfb\u4e0a\u7684\u6700\u4f18\u4f4d\u7f6e&#xff0c;\u53ea\u6709\u4e0e\u4e1a\u52a1\u5f62\u6001\u5339\u914d\u7684\u4f4d\u7f6e\u2014\u2014\u8fd9\u662f 03 \u7bc7\u9009\u578b\u51b3\u7b56\u6811\u7684\u601d\u60f3\u6e90\u5934\u3002\u6df7\u5408\u4f7f\u7528\u4e5f\u662f\u5e38\u6001&#xff1a;CRUD \u7528\u9ad8\u62bd\u8c61&#xff0c;\u590d\u6742\u62a5\u8868\u7528\u4f4e\u62bd\u8c61\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u5bf9\u8c61\u72b6\u6001\u4e0e\u8eab\u4efd\u7ba1\u7406<\/h3>\n<h4>3.1 \u4e24\u79cd\u8eab\u4efd<\/h4>\n<p>\u540c\u4e00\u4e2a&#034;\u5b9e\u4f53&#034;\u6709\u4e24\u79cd\u8eab\u4efd\u6982\u5ff5&#xff0c;\u6df7\u6dc6\u662f\u9ad8\u9891 bug \u6e90&#xff1a;<\/p>\n<table>\n<tr>\u8eab\u4efd\u542b\u4e49\u6bd4\u8f83\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>\u5bf9\u8c61\u8eab\u4efd<\/td>\n<td>\u5185\u5b58\u4e2d\u662f\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61<\/td>\n<td>&#061;&#061;&#xff08;\u5f15\u7528\u76f8\u7b49&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e3b\u952e\u8eab\u4efd<\/td>\n<td>\u6570\u636e\u5e93\u91cc\u662f\u4e0d\u662f\u540c\u4e00\u884c<\/td>\n<td>\u4e3b\u952e\u76f8\u7b49&#xff08;\u4e1a\u52a1 equals&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5178\u578b\u9677\u9631&#xff1a;<\/p>\n<p>\u4f1a\u8bdd1 \u52a0\u8f7d id&#061;5 \u7684\u7528\u6237 \u2192 \u5bf9\u8c61 A<br \/>\n\u4f1a\u8bdd2 \u52a0\u8f7d id&#061;5 \u7684\u7528\u6237 \u2192 \u5bf9\u8c61 B<br \/>\nA &#061;&#061; B \u4e3a false&#xff08;\u4e24\u4e2a\u5185\u5b58\u5bf9\u8c61&#xff09;<br \/>\nA \u4e0e B \u4e3b\u952e\u76f8\u7b49&#xff08;\u540c\u4e00\u884c\u6570\u636e&#xff09;<\/p>\n<p>\u63a8\u8bba&#xff1a;<\/p>\n<ul>\n<li>\u6e38\u79bb\u5bf9\u8c61\u4e4b\u95f4\u4e0d\u80fd\u7528 &#061;&#061; \u5224\u7b49&#xff0c;\u5fc5\u987b\u7528\u4e3b\u952e\/\u4e1a\u52a1\u5b57\u6bb5 equals&#xff1b;<\/li>\n<li>\u653e\u8fdb HashSet\/HashMap \u7684\u5b9e\u4f53&#xff0c;hashCode \u5fc5\u987b\u7a33\u5b9a\u2014\u2014\u7981\u7528\u4e3b\u952e\u53ef\u53d8\u5b57\u6bb5&#xff1a;\u65b0\u5bf9\u8c61\u4fdd\u5b58\u524d\u4e3b\u952e\u4e3a null&#xff0c;\u4fdd\u5b58\u540e\u4e3b\u952e\u751f\u6210&#xff0c;hashCode \u53d8\u4e86&#xff0c;\u5bf9\u8c61\u5728\u96c6\u5408\u91cc&#034;\u5931\u8e2a&#034;\u3002\u63a8\u8350\u7528\u4e0d\u53ef\u53d8\u7684\u4e1a\u52a1\u952e&#xff08;\u5982\u90ae\u7bb1&#xff09;\u6216\u56fa\u5b9a\u503c\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<h4>3.2 \u56db\u79cd\u901a\u7528\u72b6\u6001<\/h4>\n<p>\u65e0\u8bba JPA \u8fd8\u662f\u5176\u4ed6\u5168\u91cf ORM&#xff0c;\u5b9e\u4f53\u90fd\u5728\u8fd9\u56db\u79cd\u72b6\u6001\u95f4\u8fc1\u79fb&#xff08;JPA \u89c4\u8303\u8bed\u4e49\u89c1 02 \u7bc7&#xff09;&#xff1a;<\/p>\n<p>        new<br \/>\n\u77ac\u65f6&#xff08;transient&#xff09;\u2500\u2500\u4fdd\u5b58\u2500\u2500\u2192 \u6301\u4e45&#xff08;persistent&#xff0c;\u88ab\u4e0a\u4e0b\u6587\u8ddf\u8e2a&#xff09;<br \/>\n                                \u2502 \u5173\u95ed\u4e0a\u4e0b\u6587\/\u6e05\u9664<br \/>\n                                \u25bc<br \/>\n                            \u6e38\u79bb&#xff08;detached&#xff0c;\u6709\u8eab\u4efd\u3001\u65e0\u8ddf\u8e2a&#xff09;<br \/>\n                                \u2502 \u91cd\u65b0\u5408\u5e76<br \/>\n                                \u2514\u2500\u2500\u2192 \u6301\u4e45<br \/>\n\u6301\u4e45 \u2500\u2500\u5220\u9664\u6807\u8bb0\u2500\u2500\u2192 \u5220\u9664&#xff08;removed&#xff0c;\u63d0\u4ea4\u65f6 DELETE&#xff09;<\/p>\n<p>\u72b6\u6001\u7684\u610f\u4e49\u5728\u4e8e\u884c\u4e3a\u5dee\u5f02&#xff1a;<\/p>\n<ul>\n<li>\u6301\u4e45\u6001&#xff1a;\u4fee\u6539\u4f1a\u88ab\u810f\u68c0\u67e5\u611f\u77e5&#xff0c;\u63d0\u4ea4\u65f6\u81ea\u52a8 UPDATE&#xff1b;<\/li>\n<li>\u6e38\u79bb\u6001&#xff1a;\u4fee\u6539\u65e0\u4eba\u77e5\u6653&#xff0c;\u5fc5\u987b\u663e\u5f0f\u5408\u5e76&#xff08;merge&#xff09;\u6216\u66f4\u65b0&#xff1b;<\/li>\n<li>&#034;\u6539\u4e86\u5bf9\u8c61\u5374\u6ca1\u5165\u5e93&#034;\u7684 bug&#xff0c;\u4e5d\u6210\u662f\u72b6\u6001\u8ba4\u77e5\u9519\u8bef\u3002<\/li>\n<\/ul>\n<h4>3.3 \u5de5\u4f5c\u5355\u5143&#xff08;Unit of Work&#xff09;<\/h4>\n<p>\u5168\u91cf ORM \u7684\u6838\u5fc3\u673a\u5236&#xff1a;<\/p>\n<p>\u4e8b\u52a1\u5f00\u59cb \u2192 \u6253\u5f00\u4e0a\u4e0b\u6587<br \/>\n   \u52a0\u8f7d\u5b9e\u4f53\u3001\u4fee\u6539\u5bf9\u8c61\u56fe&#xff08;\u6b64\u65f6\u4e0d\u53d1 SQL&#xff09;<br \/>\n   \u4e0a\u4e0b\u6587\u6301\u7eed\u8ddf\u8e2a\u53d8\u66f4&#xff08;\u810f\u68c0\u67e5&#xff09;<br \/>\n\u4e8b\u52a1\u63d0\u4ea4 \u2192 \u7edf\u4e00\u751f\u6210\u5e76\u6267\u884c INSERT\/UPDATE\/DELETE&#xff08;flush&#xff09;<\/p>\n<p>\u4ef7\u503c&#xff1a;SQL \u6570\u91cf\u4e0e\u987a\u5e8f\u7531\u6846\u67b6\u4f18\u5316&#xff08;\u5982\u6279\u91cf\u3001\u5148 INSERT \u7236\u540e INSERT \u5b50&#xff09;&#xff1b;\u4ee3\u4ef7&#xff1a;\u53d8\u66f4\u5728\u63d0\u4ea4\u77ac\u95f4\u624d\u843d\u5e93&#xff0c;\u5f02\u5e38\u53d1\u751f\u7684\u65f6\u673a\u88ab\u63a8\u8fdf&#xff0c;\u6392\u9519\u8981\u7406\u89e3&#034;\u6539\u5185\u5b58 \u2260 \u5165\u5e93&#034;\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u5173\u8054\u4e0e\u7ea7\u8054<\/h3>\n<h4>4.1 \u65b9\u5411\u7684\u9009\u62e9<\/h4>\n<table>\n<tr>\u65b9\u5411\u7279\u70b9\u5efa\u8bae<\/tr>\n<tbody>\n<tr>\n<td>\u5355\u5411<\/td>\n<td>\u53ea\u6709\u4e00\u7aef\u6301\u6709\u5f15\u7528&#xff0c;\u6620\u5c04\u7b80\u5355<\/td>\n<td>\u9ed8\u8ba4\u9009\u62e9&#xff0c;\u591f\u7528\u5c31\u4e0d\u8981\u53cc\u5411<\/td>\n<\/tr>\n<tr>\n<td>\u53cc\u5411<\/td>\n<td>\u4e24\u7aef\u4e92\u76f8\u5f15\u7528&#xff0c;\u5bfc\u822a\u65b9\u4fbf<\/td>\n<td>\u9700\u8981\u53cd\u5411\u5bfc\u822a\u65f6\u624d\u7528&#xff1b;\u5fc5\u987b\u7ef4\u62a4\u4e24\u7aef\u4e00\u81f4\u6027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u53cc\u5411\u5173\u8054\u7684\u9690\u85cf\u6210\u672c&#xff1a;\u4fee\u6539\u4efb\u4e00\u7aef\u90fd\u8981\u540c\u6b65\u53e6\u4e00\u7aef&#xff0c;\u5426\u5219\u5185\u5b58\u56fe\u4e0e\u6570\u636e\u5e93\u4e0d\u4e00\u81f4\u3002\u6846\u67b6\u53ea\u8ba4&#034;\u5f52\u5c5e\u7aef&#034;&#xff08;owning side&#xff0c;\u5373\u5916\u952e\u6240\u5728\u7aef&#xff09;\u5199\u5e93&#xff0c;\u53e6\u4e00\u7aef\u53ea\u662f\u5185\u5b58\u4fbf\u5229\u2014\u2014\u4ee5\u4e3a\u6539\u54ea\u7aef\u90fd\u751f\u6548&#xff0c;\u662f\u7ecf\u5178\u8bef\u89e3\u3002<\/p>\n<h4>4.2 \u5f52\u5c5e\u7aef\u539f\u5219<\/h4>\n<p>\u5199\u5e93\u884c\u4e3a\u7531\u5f52\u5c5e\u7aef\u51b3\u5b9a&#xff1a;<br \/>\n  &#064;OneToMany \u7aef\u901a\u5e38\u662f\u53cd\u5411\u7aef&#xff08;\u975e\u5f52\u5c5e&#xff09;<br \/>\n  &#064;ManyToOne \u7aef\u6301\u6709\u5916\u952e&#xff0c;\u662f\u5f52\u5c5e\u7aef<br \/>\n\u53ea\u5728\u5f52\u5c5e\u7aef\u505a\u589e\u5220\u6539&#xff0c;\u53cd\u5411\u7aef\u4ec5\u505a\u5185\u5b58\u540c\u6b65<\/p>\n<h4>4.3 \u7ea7\u8054\u8bed\u4e49<\/h4>\n<p>\u7ea7\u8054&#xff08;cascade&#xff09;\u56de\u7b54&#034;\u5bf9\u7236\u5b9e\u4f53\u64cd\u4f5c\u65f6&#xff0c;\u5173\u8054\u5b50\u5b9e\u4f53\u600e\u4e48\u529e&#034;&#xff1a;<\/p>\n<table>\n<tr>\u7ea7\u8054\u7c7b\u578b\u8bed\u4e49<\/tr>\n<tbody>\n<tr>\n<td>persist<\/td>\n<td>\u4fdd\u5b58\u7236\u65f6&#xff0c;\u672a\u4fdd\u5b58\u7684\u5b50\u4e00\u5e76\u4fdd\u5b58<\/td>\n<\/tr>\n<tr>\n<td>merge<\/td>\n<td>\u5408\u5e76\u7236\u65f6&#xff0c;\u5b50\u4e00\u5e76\u5408\u5e76<\/td>\n<\/tr>\n<tr>\n<td>remove<\/td>\n<td>\u5220\u9664\u7236\u65f6&#xff0c;\u5b50\u4e00\u5e76\u5220\u9664&#xff08;\u914d\u5408\u5916\u952e\u7b56\u7565&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5b64\u513f\u5220\u9664&#xff08;orphanRemoval&#xff09;<\/td>\n<td>\u5b50\u4ece\u7236\u7684\u96c6\u5408\u4e2d\u79fb\u9664\u5373\u5220\u9664&#xff08;\u6bd4 remove \u66f4\u6fc0\u8fdb&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7eaa\u5f8b&#xff1a;\u7ea7\u8054\u662f\u4e3a&#034;\u805a\u5408\u6839\u6574\u4f53\u5b58\u53d6&#034;\u8bbe\u8ba1\u7684&#xff0c;\u53ea\u5bf9\u5f3a\u7ec4\u5408\u5173\u7cfb\u4f7f\u7528&#xff1b;\u5f31\u5173\u8054&#xff08;\u8de8\u805a\u5408\u5f15\u7528&#xff09;\u5e94\u53ea\u5b58\u4e3b\u952e\u3001\u4e0d\u7ea7\u8054\u3002<\/p>\n<h4>4.4 \u5927\u96c6\u5408\u7eaa\u5f8b<\/h4>\n<p>\u4e00\u5bf9\u591a\u96c6\u5408\u82e5\u53ef\u80fd\u5f88\u5927&#xff08;\u7528\u6237-\u8ba2\u5355&#xff09;&#xff0c;\u901a\u7528\u539f\u5219&#xff1a;<\/p>\n<ul>\n<li>\u4e0d\u8981\u5168\u91cf\u6620\u5c04\u6574\u4e2a\u96c6\u5408&#xff0c;\u7528\u5206\u9875\u67e5\u8be2\u4ee3\u66ff&#xff1b;<\/li>\n<li>\u96c6\u5408\u6620\u5c04\u914d\u5408\u6279\u91cf\u6293\u53d6\u5927\u5c0f\u9650\u5236&#xff1b;<\/li>\n<li>\u5fc5\u8981\u65f6\u5e94\u91cd\u65b0\u5ba1\u89c6\u6a21\u578b&#xff1a;\u662f\u4e0d\u662f\u8be5\u4ece&#034;\u5b50\u67e5\u7236&#034;\u800c\u4e0d\u662f&#034;\u7236\u6301\u5168\u96c6&#034;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e94\u3001\u61d2\u52a0\u8f7d\u4e0e N&#043;1<\/h3>\n<h4>5.1 \u4e24\u79cd\u52a0\u8f7d\u65f6\u673a<\/h4>\n<table>\n<tr>\u7b56\u7565\u884c\u4e3a\u4ee3\u4ef7<\/tr>\n<tbody>\n<tr>\n<td>\u7acb\u5373\u52a0\u8f7d&#xff08;eager&#xff09;<\/td>\n<td>\u67e5\u4e3b\u5b9e\u4f53\u65f6\u4e00\u5e76\u53d6\u5173\u8054<\/td>\n<td>\u53ef\u80fd\u53d6\u4e86\u7528\u4e0d\u5230\u7684\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u60f0\u6027\u52a0\u8f7d&#xff08;lazy&#xff09;<\/td>\n<td>\u9996\u6b21\u8bbf\u95ee\u5173\u8054\u5c5e\u6027\u624d\u53d1 SQL&#xff08;\u901a\u8fc7\u4ee3\u7406&#xff09;<\/td>\n<td>\u8bbf\u95ee\u65f6\u4e0a\u4e0b\u6587\u5fc5\u987b\u8fd8\u5f00\u7740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u60f0\u6027\u52a0\u8f7d\u7684&#034;\u4ee3\u7406&#034;\u662f\u901a\u7528\u673a\u5236&#xff1a;\u6846\u67b6\u8fd4\u56de\u4e00\u4e2a\u5b50\u7c7b\u4ee3\u7406\/\u96c6\u5408\u5305\u88c5&#xff0c;\u9996\u6b21\u8bbf\u95ee\u62e6\u622a\u540e\u53bb\u6570\u636e\u5e93\u53d6\u6570\u3002<\/p>\n<p>\u60f0\u6027\u52a0\u8f7d\u7684\u5934\u53f7\u4e8b\u6545&#xff1a;\u4e0a\u4e0b\u6587&#xff08;\u4f1a\u8bdd\/EntityManager&#xff09;\u5df2\u5173\u95ed&#xff0c;\u624d\u53bb\u8bbf\u95ee\u61d2\u5c5e\u6027\u2014\u2014\u629b&#034;\u65e0\u6cd5\u521d\u59cb\u5316\u4ee3\u7406\/\u65e0\u4f1a\u8bdd&#034;\u7c7b\u5f02\u5e38\u3002\u5178\u578b\u573a\u666f&#xff1a;\u628a\u5b9e\u4f53\u76f4\u63a5\u4e22\u7ed9\u5e8f\u5217\u5316\u5c42&#xff08;JSON \u6e32\u67d3&#xff09;&#xff0c;\u5e8f\u5217\u5316\u904d\u5386\u89e6\u53d1\u4e86\u61d2\u52a0\u8f7d\u3002\u5bf9\u7b56&#xff1a;\u4e8b\u52a1\u5185\u53d6\u9f50\u6570\u636e\u3001DTO \u7ec4\u88c5\u3001\u6216\u663e\u5f0f fetch\u3002<\/p>\n<h4>5.2 N&#043;1 \u95ee\u9898&#xff08;\u901a\u7528\u6a21\u578b&#xff09;<\/h4>\n<p>\u67e5\u8ba2\u5355\u5217\u8868&#xff1a;1 \u6b21\u67e5\u8be2\u8fd4\u56de N \u6761\u8ba2\u5355<br \/>\n\u6bcf\u6761\u8ba2\u5355\u8bbf\u95ee .getUser()&#xff08;\u61d2\u52a0\u8f7d&#xff09;\u2192 \u5404\u89e6\u53d1 1 \u6b21\u67e5\u8be2<br \/>\n\u603b\u8ba1 &#061; 1 &#043; N \u6b21\u67e5\u8be2<\/p>\n<p>\u6570\u636e\u91cf\u8d8a\u5927&#xff0c;\u67e5\u8be2\u6b21\u6570\u7ebf\u6027\u7206\u70b8\u3002\u8fd9\u662f\u6240\u6709\u61d2\u52a0\u8f7d ORM \u7684\u5171\u6027\u95ee\u9898&#xff08;\u4e0d\u9650\u4e8e JPA&#xff09;\u3002<\/p>\n<h4>5.3 \u901a\u7528\u5bf9\u7b56<\/h4>\n<table>\n<tr>\u624b\u6bb5\u539f\u7406\u9002\u7528<\/tr>\n<tbody>\n<tr>\n<td>\u6279\u91cf\u6293\u53d6<\/td>\n<td>\u628a N \u6b21\u5355\u67e5\u5408\u5e76\u4e3a\u6309 IN \u7684\u82e5\u5e72\u6279\u67e5<\/td>\n<td>\u5168\u5c40\u9ed8\u8ba4\u7b56\u7565<\/td>\n<\/tr>\n<tr>\n<td>\u8fde\u63a5\u6293\u53d6&#xff08;join fetch&#xff09;<\/td>\n<td>\u4e00\u6761 SQL \u7528 JOIN \u5e26\u51fa\u5173\u8054<\/td>\n<td>\u660e\u786e\u77e5\u9053\u8981\u5173\u8054\u6570\u636e\u7684\u67e5\u8be2<\/td>\n<\/tr>\n<tr>\n<td>\u6295\u5f71\u67e5\u8be2<\/td>\n<td>\u53ea SELECT \u9700\u8981\u7684\u5217&#xff0c;\u4e0d\u52a0\u8f7d\u5b9e\u4f53\u56fe<\/td>\n<td>\u5217\u8868\u9875\u3001\u5c55\u793a\u573a\u666f<\/td>\n<\/tr>\n<tr>\n<td>DTO \u7ec4\u88c5<\/td>\n<td>\u67e5\u8be2\u76f4\u63a5\u6620\u5c04\u5230 DTO&#xff0c;\u7ed5\u5f00\u5b9e\u4f53\u4e0e\u61d2\u52a0\u8f7d<\/td>\n<td>\u8bfb\u591a\u5199\u5c11\u7684\u63a5\u53e3&#xff08;CQRS \u601d\u60f3&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8bfb\u573a\u666f\u4f18\u5148\u6295\u5f71\/DTO&#xff0c;\u5199\u573a\u666f\u624d\u7528\u5b8c\u6574\u5b9e\u4f53\u56fe\u2014\u2014\u8fd9\u662f\u7ed5\u5f00\u61d2\u52a0\u8f7d\u590d\u6742\u6027\u7684\u901a\u7528\u67b6\u6784\u5efa\u8bae\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u4e8b\u52a1\u8fb9\u754c<\/h3>\n<h4>6.1 \u5de5\u4f5c\u5355\u5143\u4e0e\u4e8b\u52a1\u7ed1\u5b9a<\/h4>\n<p>\u6b63\u786e\u59ff\u52bf&#xff1a;<br \/>\n  \u4e8b\u52a1\u5f00\u59cb \u2192 \u6253\u5f00\u4e0a\u4e0b\u6587 \u2192 \u4e1a\u52a1\u64cd\u4f5c \u2192 \u63d0\u4ea4&#xff08;\u7edf\u4e00 flush&#xff09;\u2192 \u5173\u95ed\u4e0a\u4e0b\u6587<br \/>\n\u53cd\u59ff\u52bf&#xff1a;<br \/>\n  \u4e0a\u4e0b\u6587\u6a2a\u8de8\u591a\u5c42\/\u957f\u5f00\u4e0d\u5173 \u2192 \u72b6\u6001\u5931\u63a7\u3001\u8fde\u63a5\u5360\u7528<\/p>\n<p>\u4e0a\u4e0b\u6587&#xff08;\u4f1a\u8bdd\/EntityManager&#xff09;\u7684\u751f\u547d\u5468\u671f\u5e94\u4e0e\u4e8b\u52a1\u5bf9\u9f50&#xff1a;\u4e00\u4e2a\u4e1a\u52a1\u64cd\u4f5c\u4e00\u4e2a\u4e8b\u52a1\u4e00\u4e2a\u4e0a\u4e0b\u6587\u3002<\/p>\n<h4>6.2 \u4e1a\u52a1\u4e8b\u52a1\u51b3\u5b9a\u8d44\u6e90\u4e8b\u52a1<\/h4>\n<p>\u4e8b\u52a1\u8fb9\u754c\u5e94\u6309\u4e1a\u52a1\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u5212&#xff08;\u201c\u4e0b\u5355 &#061; \u6263\u5e93\u5b58 &#043; \u5efa\u8ba2\u5355&#xff0c;\u8981\u4e48\u90fd\u6210\u8981\u4e48\u90fd\u4e0d\u6210\u201d&#xff09;&#xff0c;\u800c\u4e0d\u662f\u6309\u6280\u672f\u5c42\u673a\u68b0\u5212\u5206\u3002\u8de8\u805a\u5408\u3001\u8de8\u670d\u52a1\u7684\u4e00\u81f4\u6027\u5df2\u8d85\u51fa\u5355\u5e93\u4e8b\u52a1\u80fd\u529b&#xff0c;\u5c5e\u5206\u5e03\u5f0f\u4e8b\u52a1\u8303\u7574&#xff08;\u5f52\u7cfb\u7edf\u67b6\u6784\u77e5\u8bc6\u5e93&#xff09;\u3002<\/p>\n<h4>6.3 \u53cd\u6a21\u5f0f&#xff1a;Open 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\/>\n<h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<li>\u963b\u6297\u5931\u914d\u662f ORM \u5b58\u5728\u7684\u539f\u56e0&#xff1a;\u5bf9\u8c61\u56fe\u4e0e\u5173\u7cfb\u8868\u5728\u7c92\u5ea6\u3001\u8eab\u4efd\u3001\u5173\u8054\u3001\u884c\u4e3a\u3001\u4e8b\u52a1\u4e94\u4e2a\u7ef4\u5ea6\u8303\u5f0f\u4e0d\u540c&#xff1b;ORM \u505a\u53cc\u5411\u7ffb\u8bd1&#xff0c;\u4ee3\u4ef7\u662f\u900f\u660e\u6027\u3001\u4e00\u81f4\u6027\u4e0e\u8bed\u4e49\u590d\u6742\u6027\u3002<\/li>\n<li>\u6a21\u5f0f\u8c31\u7cfb&#xff1a;\u5168\u91cf ORM \u2192 SQL \u6620\u5c04 \u2192 \u7c7b\u578b\u5b89\u5168 SQL \u6784\u5efa \u2192 Active Record \u2192 \u624b\u5199 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\u6bd4\u8f83\u5bf9\u8c61\u8eab\u4efd&#xff08;\u5185\u5b58\u5f15\u7528&#xff09;&#xff0c;\u4e24\u4e2a\u4e0d\u540c\u4f1a\u8bdd\u5206\u522b\u52a0\u8f7d\u540c\u4e00\u884c\u4f1a\u8fd4\u56de\u4e24\u4e2a\u4e0d\u540c\u5185\u5b58\u5bf9\u8c61&#xff0c;&#061;&#061; \u4e3a false&#xff0c;\u4f46\u5b83\u4eec\u4e3b\u952e\u8eab\u4efd\u76f8\u540c&#xff08;\u540c\u4e00\u884c\u6570\u636e&#xff09;\u3002\u6e38\u79bb\u5bf9\u8c61\u8131\u79bb\u4e86\u4e0a\u4e0b\u6587&#xff0c;\u6846\u67b6\u4e0d\u4fdd\u8bc1&#034;\u540c\u4e00\u884c\u53ea\u6709\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b&#034;&#xff08;\u53ea\u6709\u6301\u4e45\u6001\u5728\u540c\u4e00\u4e0a\u4e0b\u6587\u4e2d\u624d\u6709\u6b64\u4fdd\u8bc1&#xff09;\u3002\u6240\u4ee5\u4e1a\u52a1\u5224\u7b49\u5fc5\u987b\u7528\u57fa\u4e8e\u4e3b\u952e\u6216\u4e1a\u52a1\u5b57\u6bb5\u7684 equals&#xff0c;\u8fd9\u4e5f\u662f\u5b9e\u4f53\u7c7b\u6b63\u786e\u5b9e\u73b0 equals\/hashCode \u7684\u539f\u56e0\u3002<\/p>\n<p>4. \u5b9e\u4f53\u7c7b\u7684 hashCode 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\u67e5\u8be2&#xff1f;\u6709\u54ea\u4e9b\u901a\u7528\u89e3\u6cd5&#xff1f;<\/p>\n<p>\u8981\u70b9&#xff1a;\u67e5\u4e3b\u96c6\u5408 1 \u6b21&#xff0c;\u6bcf\u6761\u8bb0\u5f55\u8bbf\u95ee\u61d2\u52a0\u8f7d\u5173\u8054\u5404\u89e6\u53d1 1 \u6b21&#xff0c;\u5171 1&#043;N \u6b21\u67e5\u8be2&#xff0c;\u968f\u6570\u636e\u91cf\u7ebf\u6027\u7206\u70b8\u3002\u901a\u7528\u89e3\u6cd5\u56db\u79cd&#xff1a;\u6279\u91cf\u6293\u53d6&#xff08;\u628a N \u6b21\u5355\u67e5\u5408\u5e76\u4e3a IN \u6279\u67e5&#xff09;&#xff1b;\u8fde\u63a5\u6293\u53d6&#xff08;JOIN \u4e00\u6761 SQL \u5e26\u51fa&#xff0c;\u660e\u786e\u9700\u8981\u5173\u8054\u65f6\u7528&#xff09;&#xff1b;\u6295\u5f71\u67e5\u8be2&#xff08;\u53ea SELECT \u6240\u9700\u5217&#xff09;&#xff1b;DTO \u7ec4\u88c5&#xff08;\u67e5\u8be2\u76f4\u63a5\u6620\u5c04 DTO&#xff0c;\u7ed5\u5f00\u5b9e\u4f53\u56fe&#xff09;\u3002\u67b6\u6784\u5c42\u9762&#xff1a;\u8bfb\u573a\u666f\u4f18\u5148\u6295\u5f71\/DTO&#xff0c;\u5199\u573a\u666f\u624d\u7528\u5b8c\u6574\u5b9e\u4f53\u56fe\u3002<\/p>\n<p>6. \u4ec0\u4e48\u662f Open Session In View&#xff1f;\u4e3a\u4ec0\u4e48\u662f\u53cd\u6a21\u5f0f&#xff1f;<\/p>\n<p>\u8981\u70b9&#xff1a;OSIV \u628a\u6301\u4e45\u5c42\u4f1a\u8bdd\u4ece\u8bf7\u6c42\u5f00\u59cb\u4fdd\u6301\u5230\u89c6\u56fe\u6e32\u67d3\u7ed3\u675f&#xff0c;\u76ee\u7684\u662f\u8ba9\u89c6\u56fe\u5c42\u80fd\u89e6\u53d1\u61d2\u52a0\u8f7d\u3002\u4ee3\u4ef7&#xff1a;\u61d2\u52a0\u8f7d\u5728\u89c6\u56fe\u5c42\u968f\u610f\u53d1\u751f\u5bfc\u81f4 N&#043;1 \u5931\u63a7\u4e0e SQL \u65f6\u673a\u4e0d\u53ef\u63a7&#xff1b;\u4f1a\u8bdd\/\u4e8b\u52a1\u8fb9\u754c\u6a21\u7cca\u884c\u4e3a\u96be\u63a8\u7406&#xff1b;\u6570\u636e\u5e93\u8fde\u63a5\u6301\u6709\u5230\u6574\u4e2a\u8bf7\u6c42\u7ed3\u675f\u62c9\u957f\u5360\u7528\u3002\u73b0\u4ee3\u5b9e\u8df5\u5efa\u8bae\u5173\u95ed&#xff0c;\u6539\u4e3a\u5728\u670d\u52a1\u5c42\u53d6\u9f50\u6570\u636e\u8fd4\u56de DTO&#xff1b;Spring Boot \u9ad8\u7248\u672c\u5df2\u9ed8\u8ba4\u5173\u95ed\u3002<\/p>\n<p>7. \u89e3\u91ca\u5de5\u4f5c\u5355\u5143&#xff08;Unit of Work&#xff09;\u6a21\u5f0f\u3002<\/p>\n<p>\u8981\u70b9&#xff1a;\u4e00\u6b21\u4e1a\u52a1\u64cd\u4f5c\u5185&#xff0c;\u6846\u67b6\u6301\u7eed\u8ddf\u8e2a\u5b9e\u4f53\u7684\u52a0\u8f7d\u4e0e\u4fee\u6539&#xff08;\u810f\u68c0\u67e5&#xff09;&#xff0c;\u4f46\u4e0d\u7acb\u5373\u53d1 SQL&#xff1b;\u4e8b\u52a1\u63d0\u4ea4\u65f6\u7edf\u4e00\u8ba1\u7b97\u5dee\u5f02\u3001\u751f\u6210\u5e76\u6267\u884c\u5fc5\u8981\u7684 INSERT\/UPDATE\/DELETE\u3002\u4ef7\u503c&#xff1a;SQL \u6570\u91cf\u4e0e\u987a\u5e8f\u53ef\u4f18\u5316&#xff08;\u6279\u91cf\u3001\u7236\u5b50\u987a\u5e8f&#xff09;&#xff0c;\u7f16\u7a0b\u6a21\u578b\u662f&#034;\u6539\u5bf9\u8c61&#034;\u800c\u975e&#034;\u5199 SQL&#034;\u3002\u4ee3\u4ef7&#xff1a;\u53d8\u66f4\u843d\u5e93\u88ab\u63a8\u8fdf\u5230\u63d0\u4ea4\u77ac\u95f4&#xff0c;\u5f02\u5e38\u65f6\u673a\u5ef6\u540e&#xff1b;\u7406\u89e3&#034;\u6539\u5185\u5b58 \u2260 \u5165\u5e93&#034;\u662f\u6392\u67e5&#034;\u6570\u636e\u6ca1\u4fdd\u5b58&#034;\u7c7b\u95ee\u9898\u7684\u5173\u952e\u3002<\/p>\n<p>8. 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Mi<\/p>\n","protected":false},"author":2,"featured_media":104894,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[188],"topic":[],"class_list":["post-104895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-188"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ORM \u901a\u7528\u539f\u7406\u4e0e\u963b\u6297\u5931\u914d\u8be6\u89e3 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/104895.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ORM 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