{"id":98162,"date":"2026-08-31T09:41:05","date_gmt":"2026-08-31T01:41:05","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/98162.html"},"modified":"2026-08-31T09:41:05","modified_gmt":"2026-08-31T01:41:05","slug":"mybatis-plus-%e6%a0%b8%e5%bf%83%e5%8a%9f%e8%83%bd%e8%af%a6%e8%a7%a3%ef%bc%9a%e6%9d%a1%e4%bb%b6%e6%9e%84%e9%80%a0%e5%99%a8%e3%80%81%e8%87%aa%e5%ae%9a%e4%b9%89-sql-%e4%b8%8e%e4%b8%bb%e9%94%ae%e7%ad%96","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/98162.html","title":{"rendered":"MyBatis-Plus \u6838\u5fc3\u529f\u80fd\u8be6\u89e3\uff1a\u6761\u4ef6\u6784\u9020\u5668\u3001\u81ea\u5b9a\u4e49 SQL \u4e0e\u4e3b\u952e\u7b56\u7565"},"content":{"rendered":"<h3>1. \u5f15\u8a00<\/h3>\n<p>MyBatis-Plus&#xff08;\u7b80\u79f0 MP&#xff09;\u662f MyBatis \u7684\u589e\u5f3a\u5de5\u5177&#xff0c;\u5728 MyBatis \u7684\u57fa\u7840\u4e0a\u53ea\u505a\u589e\u5f3a\u4e0d\u505a\u6539\u53d8&#xff0c;\u4e3a\u7b80\u5316\u5f00\u53d1\u3001\u63d0\u9ad8\u6548\u7387\u800c\u751f\u3002\u5b83\u5185\u7f6e\u4e86\u901a\u7528 Mapper\u3001\u901a\u7528 Service&#xff0c;\u51e0\u4e4e\u53ef\u4ee5\u4e0d\u7528\u5199 SQL \u5c31\u80fd\u5b8c\u6210\u5355\u8868 CRUD \u64cd\u4f5c&#xff0c;\u540c\u65f6\u4fdd\u7559\u4e86 MyBatis \u7684\u7075\u6d3b\u6027&#xff0c;\u652f\u6301\u81ea\u5b9a\u4e49 SQL\u3001\u5206\u9875\u63d2\u4ef6\u3001\u4e50\u89c2\u9501\u63d2\u4ef6\u7b49\u5f3a\u5927\u529f\u80fd\u3002<\/p>\n<p>\u672c\u6587\u5c06\u56f4\u7ed5 MyBatis-Plus \u7684\u6838\u5fc3\u529f\u80fd\u5c55\u5f00&#xff0c;\u91cd\u70b9\u8bb2\u89e3\u6761\u4ef6\u6784\u9020\u5668&#xff08;Wrapper&#xff09;\u3001\u81ea\u5b9a\u4e49 SQL\u3001\u4e3b\u952e\u7b56\u7565\u3001\u5206\u9875\u63d2\u4ef6\u3001\u4e50\u89c2\u9501\u7b49\u6838\u5fc3\u7279\u6027\u7684\u5b9e\u73b0\u539f\u7406\u4e0e\u4f7f\u7528\u65b9\u5f0f&#xff0c;\u5e2e\u52a9\u8bfb\u8005\u4ece\u539f\u7406\u5c42\u9762\u7406\u89e3 MP \u7684\u8bbe\u8ba1\u601d\u60f3\u3002<\/p>\n<h3>2. MyBatis-Plus \u6838\u5fc3\u529f\u80fd\u603b\u89c8<\/h3>\n<p>MyBatis-Plus \u7684\u6838\u5fc3\u529f\u80fd\u53ef\u4ee5\u6982\u62ec\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762&#xff1a;<\/p>\n<ul>\n<li>\u901a\u7528 CRUD&#xff1a;\u5185\u7f6e BaseMapper \u4e0e IService&#xff0c;\u63d0\u4f9b\u5355\u8868\u589e\u5220\u6539\u67e5\u7684\u901a\u7528\u65b9\u6cd5&#xff0c;\u65e0\u9700\u7f16\u5199 SQL\u3002<\/li>\n<li>\u6761\u4ef6\u6784\u9020\u5668&#xff08;Wrapper&#xff09;&#xff1a;\u901a\u8fc7\u9762\u5411\u5bf9\u8c61\u7684\u94fe\u5f0f API \u6784\u9020\u67e5\u8be2\u6761\u4ef6&#xff0c;\u652f\u6301 Lambda \u8868\u8fbe\u5f0f&#xff0c;\u7f16\u8bd1\u671f\u6821\u9a8c\u5b57\u6bb5\u540d\u3002<\/li>\n<li>\u81ea\u5b9a\u4e49 SQL&#xff1a;\u652f\u6301\u5728 XML \u6216\u6ce8\u89e3\u4e2d\u7f16\u5199\u81ea\u5b9a\u4e49 SQL&#xff0c;\u5e76\u53ef\u4e0e Wrapper \u7ed3\u5408\u5b9e\u73b0\u52a8\u6001\u6761\u4ef6\u62fc\u63a5\u3002<\/li>\n<li>\u5206\u9875\u63d2\u4ef6&#xff1a;\u57fa\u4e8e MyBatis \u62e6\u622a\u5668\u5b9e\u73b0\u7269\u7406\u5206\u9875&#xff0c;\u81ea\u52a8\u751f\u6210 COUNT \u67e5\u8be2\u3002<\/li>\n<li>\u4e50\u89c2\u9501\u63d2\u4ef6&#xff1a;\u901a\u8fc7\u7248\u672c\u53f7\u5b57\u6bb5\u5b9e\u73b0\u4e50\u89c2\u9501&#xff0c;\u81ea\u52a8\u62fc\u63a5 SET version &#061; version &#043; 1\u3002<\/li>\n<li>\u4e3b\u952e\u7b56\u7565&#xff1a;\u652f\u6301\u96ea\u82b1\u7b97\u6cd5\u3001\u81ea\u589e\u3001UUID \u7b49\u591a\u79cd\u4e3b\u952e\u751f\u6210\u7b56\u7565\u3002<\/li>\n<li>\u903b\u8f91\u5220\u9664&#xff1a;\u901a\u8fc7\u5168\u5c40\u914d\u7f6e\u5b9e\u73b0\u903b\u8f91\u5220\u9664&#xff0c;\u81ea\u52a8\u62fc\u63a5 deleted &#061; 0 \u6761\u4ef6\u3002<\/li>\n<li>\u4ee3\u7801\u751f\u6210\u5668&#xff1a;\u4e00\u952e\u751f\u6210 Entity\u3001Mapper\u3001Service\u3001Controller \u7b49\u5168\u5957\u4ee3\u7801\u3002<\/li>\n<\/ul>\n<p>\u6574\u4f53\u67b6\u6784\u5982\u4e0b\u56fe\u6240\u793a&#xff1a;<\/p>\n<p>#mermaid-svg-mtz9XE2DC8kCcDGD{font-family:\\&#8221;trebuchet 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class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u4e1a\u52a1\u4ee3\u7801<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>BaseMapper \/ IService<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u6761\u4ef6\u6784\u9020\u5668 Wrapper<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>SQL \u89e3\u6790\u4e0e\u62fc\u63a5<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>MyBatis \u6267\u884c\u5668<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u6570\u636e\u5e93<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5206\u9875\u63d2\u4ef6 \/ \u4e50\u89c2\u9501\u63d2\u4ef6<\/p>\n<p><\/span><\/p>\n<h3>3. \u6761\u4ef6\u6784\u9020\u5668&#xff08;Wrapper&#xff09;\u539f\u7406\u4e0e\u4f7f\u7528<\/h3>\n<h4>3.1 Wrapper \u662f\u4ec0\u4e48<\/h4>\n<p>Wrapper \u662f MyBatis-Plus \u4e2d\u7528\u4e8e\u5c01\u88c5\u67e5\u8be2\u6761\u4ef6\u7684\u6838\u5fc3\u62bd\u8c61\u7c7b&#xff0c;\u5b83\u628a SQL \u4e2d\u7684 WHERE\u3001ORDER BY\u3001GROUP BY\u3001HAVING \u7b49\u5b50\u53e5\u62bd\u8c61\u4e3a Java \u5bf9\u8c61&#xff0c;\u901a\u8fc7\u94fe\u5f0f\u8c03\u7528\u6784\u9020\u67e5\u8be2\u6761\u4ef6\u3002<\/p>\n<p>Wrapper \u7684\u7ee7\u627f\u4f53\u7cfb\u5982\u4e0b&#xff1a;<\/p>\n<p>Wrapper&lt;T&gt;<br \/>\n\u251c\u2500\u2500 AbstractWrapper&lt;T&gt;<br \/>\n\u2502   \u251c\u2500\u2500 QueryWrapper&lt;T&gt;<br \/>\n\u2502   \u251c\u2500\u2500 UpdateWrapper&lt;T&gt;<br \/>\n\u2502   \u2514\u2500\u2500 LambdaQueryWrapper&lt;T&gt;<br \/>\n\u2502       \u2514\u2500\u2500 LambdaUpdateWrapper&lt;T&gt;<\/p>\n<h4>3.2 \u6838\u5fc3\u5b9e\u73b0\u539f\u7406<\/h4>\n<p>Wrapper \u7684\u6838\u5fc3\u539f\u7406\u662f\u5c06\u6761\u4ef6\u8868\u8fbe\u5f0f\u89e3\u6790\u4e3a SQL \u7247\u6bb5\u3002\u4ee5 QueryWrapper \u4e3a\u4f8b&#xff0c;\u8c03\u7528 eq(&#034;name&#034;, &#034;\u5f20\u4e09&#034;) \u65f6&#xff0c;\u5185\u90e8\u4f1a\u751f\u6210\u4e00\u4e2a MergeSegments \u5bf9\u8c61&#xff0c;\u5c06\u6761\u4ef6\u7247\u6bb5\u6309 AND\/OR \u7ec4\u5408&#xff0c;\u6700\u7ec8\u5728 getSqlSegment() \u65b9\u6cd5\u4e2d\u62fc\u63a5\u4e3a\u5b8c\u6574\u7684 SQL \u7247\u6bb5\u3002<\/p>\n<p>\u5173\u952e\u6e90\u7801\u903b\u8f91\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ AbstractWrapper \u4e2d\u7684\u6838\u5fc3\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Children<\/span> <span class=\"token function\">eq<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">R<\/span> column<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span> val<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">addCondition<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span> column<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">SqlKeyword<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">EQ<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Children<\/span> <span class=\"token function\">addCondition<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">boolean<\/span> condition<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">R<\/span> column<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">SqlKeyword<\/span> keyword<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span> val<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c06\u6761\u4ef6\u5c01\u88c5\u4e3a QueryCondition \u5bf9\u8c61&#xff0c;\u5b58\u5165\u6761\u4ef6\u5217\u8868<\/span><br \/>\n    queryConditions<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">QueryCondition<\/span><span class=\"token punctuation\">(<\/span>column<span class=\"token punctuation\">,<\/span> keyword<span class=\"token punctuation\">,<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Children<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5f53\u6267\u884c selectList(wrapper) \u65f6&#xff0c;MP \u4f1a\u8c03\u7528 wrapper.getSqlSegment() \u751f\u6210 WHERE \u5b50\u53e5&#xff0c;\u518d\u901a\u8fc7 TableInfo \u5c06\u5b9e\u4f53\u5b57\u6bb5\u6620\u5c04\u4e3a\u6570\u636e\u5e93\u5217\u540d&#xff0c;\u6700\u7ec8\u62fc\u88c5\u6210\u5b8c\u6574 SQL\u3002<\/p>\n<h4>3.3 \u5e38\u7528 API \u793a\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ \u67e5\u8be2\u5e74\u9f84\u5927\u4e8e 18 \u4e14\u59d3\u540d\u5305\u542b&#034;\u5f20&#034;\u7684\u7528\u6237<\/span><br \/>\n<span class=\"token class-name\">QueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wrapper <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">QueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nwrapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">gt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;age&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><br \/>\n       <span class=\"token punctuation\">.<\/span><span class=\"token function\">like<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5f20&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n       <span class=\"token punctuation\">.<\/span><span class=\"token function\">orderByDesc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;create_time&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> users <span class=\"token operator\">&#061;<\/span> userMapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectList<\/span><span class=\"token punctuation\">(<\/span>wrapper<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3.4 Lambda \u6761\u4ef6\u6784\u9020\u5668<\/h4>\n<p>Lambda \u6761\u4ef6\u6784\u9020\u5668\u901a\u8fc7 LambdaQueryWrapper \u4f7f\u7528\u5b9e\u4f53\u7c7b\u7684 getter \u65b9\u6cd5\u5f15\u7528\u4ee3\u66ff\u5b57\u7b26\u4e32\u5b57\u6bb5\u540d&#xff0c;\u7f16\u8bd1\u671f\u5373\u53ef\u6821\u9a8c\u5b57\u6bb5\u662f\u5426\u5b58\u5728&#xff0c;\u907f\u514d\u8fd0\u884c\u65f6\u56e0\u5b57\u6bb5\u540d\u62fc\u5199\u9519\u8bef\u5bfc\u81f4\u5f02\u5e38\u3002<\/p>\n<p><span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wrapper <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nwrapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">gt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><br \/>\n       <span class=\"token punctuation\">.<\/span><span class=\"token function\">like<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5f20&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n       <span class=\"token punctuation\">.<\/span><span class=\"token function\">orderByDesc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCreateTime<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> users <span class=\"token operator\">&#061;<\/span> userMapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectList<\/span><span class=\"token punctuation\">(<\/span>wrapper<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>Lambda \u7684\u5b9e\u73b0\u539f\u7406\u662f&#xff1a;\u901a\u8fc7 SerializedLambda \u89e3\u6790\u65b9\u6cd5\u5f15\u7528&#xff0c;\u63d0\u53d6\u51fa\u5bf9\u5e94\u7684\u5c5e\u6027\u540d&#xff0c;\u518d\u7ed3\u5408 TableInfo \u6620\u5c04\u4e3a\u6570\u636e\u5e93\u5217\u540d\u3002<\/p>\n<h3>4. \u81ea\u5b9a\u4e49 SQL \u7684\u5b9e\u73b0\u65b9\u5f0f<\/h3>\n<h4>4.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49 SQL<\/h4>\n<p>\u867d\u7136 MP \u63d0\u4f9b\u4e86\u901a\u7528 CRUD&#xff0c;\u4f46\u5728\u591a\u8868\u8054\u67e5\u3001\u590d\u6742\u5b50\u67e5\u8be2\u3001\u7279\u5b9a\u6570\u636e\u5e93\u51fd\u6570\u7b49\u573a\u666f\u4e0b&#xff0c;\u4ecd\u9700\u8981\u624b\u5199 SQL\u3002MP \u652f\u6301\u4e24\u79cd\u81ea\u5b9a\u4e49 SQL \u7684\u65b9\u5f0f&#xff1a;\u6ce8\u89e3\u65b9\u5f0f\u548c XML \u65b9\u5f0f\u3002<\/p>\n<h4>4.2 \u6ce8\u89e3\u65b9\u5f0f<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">UserMapper<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">BaseMapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Select<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SELECT * FROM user WHERE age &gt; #{age} AND name LIKE CONCAT(&#039;%&#039;, #{name}, &#039;%&#039;)&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">selectByCondition<\/span><span class=\"token punctuation\">(<\/span><span class=\"token annotation punctuation\">&#064;Param<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;age&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Integer<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token annotation punctuation\">&#064;Param<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.3 XML \u65b9\u5f0f<\/h4>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>mapper<\/span> <span class=\"token attr-name\">namespace<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.mapper.UserMapper<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>select<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>selectUserPage<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">resultType<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.entity.User<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        SELECT * FROM user<br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>where<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>if<\/span> <span class=\"token attr-name\">test<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>name !&#061; null and name !&#061; &#039;&#039;<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                AND name LIKE CONCAT(&#039;%&#039;, #{name}, &#039;%&#039;)<br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>if<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>if<\/span> <span class=\"token attr-name\">test<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>age !&#061; null<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n                AND age <span class=\"token entity named-entity\" title=\"&gt;\">&amp;gt;<\/span> #{age}<br \/>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>if<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>where<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>select<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>mapper<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>4.4 \u81ea\u5b9a\u4e49 SQL \u7ed3\u5408 Wrapper<\/h4>\n<p>MP \u6700\u5f3a\u5927\u7684\u7279\u6027\u4e4b\u4e00\u662f\u81ea\u5b9a\u4e49 SQL \u4e0e Wrapper \u7ed3\u5408&#xff0c;\u53ef\u4ee5\u5728\u81ea\u5b9a\u4e49 SQL \u4e2d\u52a8\u6001\u62fc\u63a5 Wrapper \u751f\u6210\u7684 WHERE \u6761\u4ef6&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Select<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SELECT * FROM user ${ew.customSqlSegment}&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">selectByWrapper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token annotation punctuation\">&#064;Param<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Constants<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">WRAPPER<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Wrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wrapper<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8c03\u7528\u65f6&#xff1a;<\/p>\n<p><span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wrapper <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nwrapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">gt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">like<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5f20&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> users <span class=\"token operator\">&#061;<\/span> userMapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectByWrapper<\/span><span class=\"token punctuation\">(<\/span>wrapper<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u7684 ${ew.customSqlSegment} \u4f1a\u88ab\u66ff\u6362\u4e3a Wrapper \u751f\u6210\u7684 WHERE \u5b50\u53e5&#xff0c;\u5b9e\u73b0\u81ea\u5b9a\u4e49 SQL \u4e0e\u52a8\u6001\u6761\u4ef6\u7684\u5b8c\u7f8e\u7ed3\u5408\u3002<\/p>\n<h3>5. \u4e3b\u952e\u7b56\u7565<\/h3>\n<h4>5.1 \u4e3b\u952e\u7b56\u7565\u7c7b\u578b<\/h4>\n<p>MyBatis-Plus \u652f\u6301\u591a\u79cd\u4e3b\u952e\u751f\u6210\u7b56\u7565&#xff0c;\u901a\u8fc7 &#064;TableId \u6ce8\u89e3\u7684 type \u5c5e\u6027\u6307\u5b9a&#xff1a;<\/p>\n<table>\n<tr>\u7b56\u7565\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>IdType.AUTO<\/td>\n<td>\u6570\u636e\u5e93\u81ea\u589e&#xff0c;\u4f9d\u8d56\u6570\u636e\u5e93\u7684\u81ea\u589e\u4e3b\u952e<\/td>\n<\/tr>\n<tr>\n<td>IdType.INPUT<\/td>\n<td>\u7528\u6237\u624b\u52a8\u8f93\u5165&#xff0c;\u4e0d\u81ea\u52a8\u751f\u6210<\/td>\n<\/tr>\n<tr>\n<td>IdType.ASSIGN_ID<\/td>\n<td>\u9ed8\u8ba4\u7b56\u7565&#xff0c;\u4f7f\u7528\u96ea\u82b1\u7b97\u6cd5\u751f\u6210\u5206\u5e03\u5f0f ID<\/td>\n<\/tr>\n<tr>\n<td>IdType.ASSIGN_UUID<\/td>\n<td>\u4f7f\u7528 UUID \u751f\u6210\u4e3b\u952e<\/td>\n<\/tr>\n<tr>\n<td>IdType.NONE<\/td>\n<td>\u4e0d\u6307\u5b9a&#xff0c;\u8ddf\u968f\u5168\u5c40\u914d\u7f6e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5.2 \u96ea\u82b1\u7b97\u6cd5\u539f\u7406<\/h4>\n<p>\u96ea\u82b1\u7b97\u6cd5&#xff08;Snowflake&#xff09;\u662f Twitter \u5f00\u6e90\u7684\u5206\u5e03\u5f0f ID \u751f\u6210\u7b97\u6cd5&#xff0c;\u751f\u6210\u7684 ID \u662f\u4e00\u4e2a 64 \u4f4d\u7684 Long \u578b\u6574\u6570&#xff0c;\u7ed3\u6784\u5982\u4e0b&#xff1a;<\/p>\n<p>| 1 bit \u7b26\u53f7\u4f4d | 41 bit \u65f6\u95f4\u6233 | 10 bit \u673a\u5668 ID | 12 bit \u5e8f\u5217\u53f7 |<\/p>\n<ul>\n<li>\u7b26\u53f7\u4f4d&#xff1a;\u56fa\u5b9a\u4e3a 0&#xff0c;\u4fdd\u8bc1 ID \u4e3a\u6b63\u6570\u3002<\/li>\n<li>\u65f6\u95f4\u6233&#xff1a;\u6beb\u79d2\u7ea7\u65f6\u95f4\u6233&#xff0c;\u53ef\u4fdd\u8bc1 69 \u5e74\u7684\u4f7f\u7528\u671f\u9650\u3002<\/li>\n<li>\u673a\u5668 ID&#xff1a;\u533a\u5206\u4e0d\u540c\u673a\u5668&#xff0c;\u652f\u6301\u6700\u591a 1024 \u53f0\u673a\u5668\u3002<\/li>\n<li>\u5e8f\u5217\u53f7&#xff1a;\u540c\u4e00\u6beb\u79d2\u5185\u7684\u9012\u589e\u5e8f\u5217&#xff0c;\u652f\u6301\u6bcf\u6beb\u79d2\u751f\u6210 4096 \u4e2a ID\u3002<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u793a\u4f8b<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;TableId<\/span><span class=\"token punctuation\">(<\/span>type <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">IdType<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">ASSIGN_ID<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Long<\/span> id<span class=\"token punctuation\">;<\/span><\/p>\n<h4>5.3 \u5168\u5c40\u914d\u7f6e<\/h4>\n<p><span class=\"token key atrule\">mybatis-plus<\/span><span class=\"token punctuation\">:<\/span><br \/>\n  <span class=\"token key atrule\">global-config<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token key atrule\">db-config<\/span><span class=\"token punctuation\">:<\/span><br \/>\n      <span class=\"token key atrule\">id-type<\/span><span class=\"token punctuation\">:<\/span> assign_id<\/p>\n<h3>6. \u5206\u9875\u63d2\u4ef6<\/h3>\n<h4>6.1 \u5206\u9875\u63d2\u4ef6\u539f\u7406<\/h4>\n<p>MyBatis-Plus \u7684\u5206\u9875\u63d2\u4ef6\u57fa\u4e8e MyBatis \u7684**\u62e6\u622a\u5668&#xff08;Interceptor&#xff09;**\u673a\u5236\u5b9e\u73b0\u3002\u5728\u6267\u884c SQL \u524d&#xff0c;\u62e6\u622a\u5668\u4f1a\u62e6\u622a Executor.query() \u65b9\u6cd5&#xff0c;\u89e3\u6790\u51fa\u539f\u59cb SQL&#xff0c;\u81ea\u52a8\u751f\u6210 COUNT \u67e5\u8be2\u548c\u5206\u9875 SQL\u3002<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Configuration<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MybatisPlusConfig<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Bean<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MybatisPlusInterceptor<\/span> <span class=\"token function\">mybatisPlusInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">MybatisPlusInterceptor<\/span> interceptor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MybatisPlusInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        interceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">addInnerInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PaginationInnerInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DbType<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">MYSQL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> interceptor<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>6.2 \u5206\u9875\u4f7f\u7528\u793a\u4f8b<\/h4>\n<p><span class=\"token class-name\">Page<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> page <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Page<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7b2c 1 \u9875&#xff0c;\u6bcf\u9875 10 \u6761<\/span><br \/>\n<span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wrapper <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LambdaQueryWrapper<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nwrapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">gt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Page<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> result <span class=\"token operator\">&#061;<\/span> userMapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectPage<\/span><span class=\"token punctuation\">(<\/span>page<span class=\"token punctuation\">,<\/span> wrapper<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u8bb0\u5f55\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTotal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u9875\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5f53\u524d\u9875\u6570\u636e&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRecords<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6.3 \u5206\u9875 SQL \u751f\u6210\u8fc7\u7a0b<\/h4>\n<p>\u4ee5 MySQL \u4e3a\u4f8b&#xff0c;\u539f\u59cb SQL \u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token keyword\">WHERE<\/span> age <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">18<\/span><\/p>\n<p>\u5206\u9875\u63d2\u4ef6\u4f1a\u751f\u6210\u4e24\u6761 SQL&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; COUNT \u67e5\u8be2<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token keyword\">WHERE<\/span> age <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">18<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5206\u9875\u67e5\u8be2<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token keyword\">WHERE<\/span> age <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">18<\/span> <span class=\"token keyword\">LIMIT<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><\/p>\n<h3>7. \u4e50\u89c2\u9501\u63d2\u4ef6<\/h3>\n<h4>7.1 \u4e50\u89c2\u9501\u539f\u7406<\/h4>\n<p>\u4e50\u89c2\u9501\u5047\u8bbe\u5e76\u53d1\u51b2\u7a81\u8f83\u5c11&#xff0c;\u5728\u66f4\u65b0\u65f6\u901a\u8fc7\u7248\u672c\u53f7\u5224\u65ad\u6570\u636e\u662f\u5426\u88ab\u4fee\u6539\u3002\u66f4\u65b0\u524d\u5148\u67e5\u8be2\u7248\u672c\u53f7&#xff0c;\u66f4\u65b0\u65f6\u643a\u5e26\u7248\u672c\u53f7\u5e76\u6267\u884c SET version &#061; version &#043; 1&#xff0c;\u82e5\u7248\u672c\u53f7\u4e0d\u5339\u914d\u5219\u66f4\u65b0\u5931\u8d25\u3002<\/p>\n<h4>7.2 \u914d\u7f6e\u4e0e\u4f7f\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ \u5b9e\u4f53\u7c7b\u4e2d\u589e\u52a0\u7248\u672c\u5b57\u6bb5<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Version<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Integer<\/span> version<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Configuration<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MybatisPlusConfig<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Bean<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MybatisPlusInterceptor<\/span> <span class=\"token function\">mybatisPlusInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">MybatisPlusInterceptor<\/span> interceptor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MybatisPlusInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        interceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">addInnerInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">OptimisticLockerInnerInterceptor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> interceptor<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>7.3 \u66f4\u65b0 SQL \u751f\u6210<\/h4>\n<p>\u6267\u884c updateById(user) \u65f6&#xff0c;MP \u81ea\u52a8\u751f\u6210\u5982\u4e0b SQL&#xff1a;<\/p>\n<p><span class=\"token keyword\">UPDATE<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token keyword\">SET<\/span> name <span class=\"token operator\">&#061;<\/span> ?<span class=\"token punctuation\">,<\/span> version <span class=\"token operator\">&#061;<\/span> version <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> ? <span class=\"token operator\">AND<\/span> version <span class=\"token operator\">&#061;<\/span> ?<\/p>\n<p>\u82e5\u66f4\u65b0\u5f71\u54cd\u884c\u6570\u4e3a 0&#xff0c;\u8bf4\u660e\u7248\u672c\u53f7\u5df2\u88ab\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539&#xff0c;\u9700\u8981\u91cd\u8bd5\u6216\u63d0\u793a\u7528\u6237\u3002<\/p>\n<h3>8. \u903b\u8f91\u5220\u9664<\/h3>\n<h4>8.1 \u903b\u8f91\u5220\u9664\u539f\u7406<\/h4>\n<p>\u903b\u8f91\u5220\u9664\u5e76\u975e\u771f\u6b63\u5220\u9664\u6570\u636e&#xff0c;\u800c\u662f\u901a\u8fc7\u6807\u8bb0\u5b57\u6bb5&#xff08;\u5982 deleted&#xff09;\u5c06\u6570\u636e\u6807\u8bb0\u4e3a\u5df2\u5220\u9664\u3002\u67e5\u8be2\u65f6\u81ea\u52a8\u62fc\u63a5 deleted &#061; 0 \u6761\u4ef6&#xff0c;\u5220\u9664\u65f6\u81ea\u52a8\u6267\u884c UPDATE \u8bed\u53e5\u3002<\/p>\n<h4>8.2 \u914d\u7f6e\u4e0e\u4f7f\u7528<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;TableLogic<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Integer<\/span> deleted<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token key atrule\">mybatis-plus<\/span><span class=\"token punctuation\">:<\/span><br \/>\n  <span class=\"token key atrule\">global-config<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token key atrule\">db-config<\/span><span class=\"token punctuation\">:<\/span><br \/>\n      <span class=\"token key atrule\">logic-delete-field<\/span><span class=\"token punctuation\">:<\/span> deleted<br \/>\n      <span class=\"token key atrule\">logic-delete-value<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">1<\/span><br \/>\n      <span class=\"token key atrule\">logic-not-delete-value<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>\u6267\u884c deleteById(1L) \u65f6&#xff0c;\u5b9e\u9645\u6267\u884c\u7684 SQL \u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">UPDATE<\/span> <span class=\"token keyword\">user<\/span> <span class=\"token keyword\">SET<\/span> deleted <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">AND<\/span> deleted <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><\/p>\n<h3>9. \u603b\u7ed3<\/h3>\n<p>MyBatis-Plus \u901a\u8fc7\u5c01\u88c5\u901a\u7528 CRUD\u3001\u6761\u4ef6\u6784\u9020\u5668\u3001\u5206\u9875\u63d2\u4ef6\u3001\u4e50\u89c2\u9501\u3001\u903b\u8f91\u5220\u9664\u7b49\u80fd\u529b&#xff0c;\u5927\u5e45\u63d0\u5347\u4e86\u5f00\u53d1\u6548\u7387\u3002\u5176\u6838\u5fc3\u8bbe\u8ba1\u601d\u60f3\u662f\u7ea6\u5b9a\u4f18\u4e8e\u914d\u7f6e\u4e0e\u53ea\u589e\u5f3a\u4e0d\u6539\u53d8&#xff1a;<\/p>\n<ul>\n<li>\u6761\u4ef6\u6784\u9020\u5668\u5c06 SQL \u6761\u4ef6\u62bd\u8c61\u4e3a Java \u5bf9\u8c61&#xff0c;\u914d\u5408 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u7f16\u8bd1\u671f\u6821\u9a8c\u3002<\/li>\n<li>\u81ea\u5b9a\u4e49 SQL\u4fdd\u7559\u4e86 MyBatis \u7684\u7075\u6d3b\u6027&#xff0c;\u5e76\u53ef\u4e0e Wrapper \u65e0\u7f1d\u7ed3\u5408\u3002<\/li>\n<li>\u5206\u9875\u4e0e\u4e50\u89c2\u9501\u63d2\u4ef6\u57fa\u4e8e MyBatis \u62e6\u622a\u5668\u673a\u5236&#xff0c;\u5bf9\u4e1a\u52a1\u4ee3\u7801\u96f6\u4fb5\u5165\u3002<\/li>\n<li>\u4e3b\u952e\u7b56\u7565\u901a\u8fc7\u96ea\u82b1\u7b97\u6cd5\u89e3\u51b3\u4e86\u5206\u5e03\u5f0f\u573a\u666f\u4e0b\u7684 ID \u751f\u6210\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u638c\u63e1\u8fd9\u4e9b\u6838\u5fc3\u529f\u80fd\u7684\u539f\u7406&#xff0c;\u4e0d\u4ec5\u80fd\u66f4\u9ad8\u6548\u5730\u4f7f\u7528 MyBatis-Plus&#xff0c;\u8fd8\u80fd\u5728\u9047\u5230\u590d\u6742\u4e1a\u52a1\u573a\u666f\u65f6\u7075\u6d3b\u6269\u5c55&#xff0c;\u5199\u51fa\u66f4\u4f18\u96c5\u7684\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u5f15\u8a00<br \/>\nMyBatis-Plus&#xff08;\u7b80\u79f0 MP&#xff09;\u662f MyBatis \u7684\u589e\u5f3a\u5de5\u5177&#xff0c;\u5728 MyBatis \u7684\u57fa\u7840\u4e0a\u53ea\u505a\u589e\u5f3a\u4e0d\u505a\u6539\u53d8&#xff0c;\u4e3a\u7b80\u5316\u5f00\u53d1\u3001\u63d0\u9ad8\u6548\u7387\u800c\u751f\u3002\u5b83\u5185\u7f6e\u4e86\u901a\u7528 Mapper\u3001\u901a\u7528 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