{"id":1585,"date":"2025-03-05T20:54:52","date_gmt":"2025-03-05T12:54:52","guid":{"rendered":"https:\/\/www.tqazy.com\/?p=1585"},"modified":"2025-03-13T17:03:03","modified_gmt":"2025-03-13T09:03:03","slug":"mybatisplus%ef%bc%88%e4%ba%8c%ef%bc%89%e6%a0%b8%e5%bf%83%e5%8a%9f%e8%83%bd03-iservice%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/www.tqazy.com\/?p=1585","title":{"rendered":"MybatisPlus\uff08\u4e8c\uff09\u6838\u5fc3\u529f\u80fd03 \u2014 IService\u63a5\u53e3"},"content":{"rendered":"<blockquote>\n<p>\u89c6\u9891\u8bfe\u7a0b\u5730\u5740\uff1a<a href=\"https:\/\/www.bilibili.com\/video\/BV1S142197x7\" target=\"_black\">\u9ed1\u9a6c\u5546\u57ce\u9879\u76ee<\/a><\/p>\n<p>\u4e0a\u4e00\u8282\uff1a<a href=\"https:\/\/www.tqazy.com\/?p=1568\" target=\"_black\">MybatisPlus\uff08\u4e8c\uff09\u6838\u5fc3\u529f\u80fd02 \u2014 \u81ea\u5b9a\u4e49SQL<\/a><\/p>\n<p>\u672c\u8282\u5b66\u4e60MybatisPlus\uff08MP\uff09\u7684\u6838\u5fc3\u529f\u80fd \u2014 IService\u63a5\u53e3\uff1a<\/p>\n<ul>\n<li>IService\u63a5\u53e3\u57fa\u672c\u7528\u6cd5<\/li>\n<li>IService\u5f00\u53d1\u57fa\u7840\u4e1a\u52a1\u63a5\u53e3<\/li>\n<li>IService\u5f00\u53d1\u590d\u6742\u4e1a\u52a1\u63a5\u53e3<\/li>\n<li>IService\u7684lambda\u65b9\u6cd5<\/li>\n<li>IService\u6279\u91cf\u65b0\u589e<\/li>\n<\/ul>\n<\/blockquote>\n<div style=\"height:1.5em\"><\/div>\n<h1>\u4e00\u3001IService \u63a5\u53e3\u57fa\u672c\u7528\u6cd5<\/h1>\n<h2>1.1 IService\u63a5\u53e3<\/h2>\n<h3>1.1.1 \u65b0\u589e\u63a5\u53e3<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125045829.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125045829.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>save(T)<\/code> \uff1a\u4fdd\u5b58\u4e00\u4e2a\u5b9e\u4f53\u7c7b\u3002<\/li>\n<li><code>saveBatch(Collection&lt;T&gt;)<\/code> \uff1a\u6279\u91cf\u65b0\u589e\u5b9e\u4f53\u5bf9\u8c61\u96c6\u5408\u3002<\/li>\n<li><code>saveBatch(Collection&lt;T&gt;, int)<\/code> \uff1a\u6279\u91cf\u65b0\u589e\u5b9e\u4f53\u5bf9\u8c61\u96c6\u5408\uff0c\u6309\u7167\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5206\u6279\u6b21\u65b0\u589e\u3002\n<ul>\n<li>\u4f8b\u5982\uff1a\u96c6\u5408\u4e2d\u670990\u4e2a\u5b9e\u4f53\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a20\uff0c\u90a3\u4e48\u4f1a\u5206\u4e3a5\u6b21\u8fdb\u884c\u4fdd\u5b58\uff0c\u524d4\u6b21\u6bcf\u6b2120\u4e2a\uff0c\u6700\u540e\u4e00\u6b2110\u4e2a\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>saveOrUpdateBatch(Collection&lt;T&gt;)<\/code> \uff1a\u6279\u91cf\u65b0\u589e\u6216\u4fee\u6539\u5b9e\u4f53\u5bf9\u8c61\u96c6\u5408\u3002\n<ul>\n<li>\u4f20\u5165\u7684\u53c2\u6570\u4f1a\u5224\u65ad\u662f\u5426\u5b58\u5728id\u53c2\u6570\uff0c\u5982\u679c\u6709\u5c31\u4f1a\u8ba4\u4e3a\u662f\u66f4\u65b0\u64cd\u4f5c\uff1b\u5982\u679c\u6ca1\u6709\u5c31\u662f\u65b0\u589e\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>saveOrUpdateBatch(Collection&lt;T&gt;, int)<\/code> \uff1a\u5206\u6279\u6b21\uff0c\u6279\u91cf\u65b0\u589e\u6216\u4fee\u6539\u5b9e\u4f53\u5bf9\u8c61\u96c6\u5408\u3002\u6548\u679c\u540c\u4e0a\u3002<\/li>\n<li><code>saveOrUpdate(T)<\/code> \uff1a\u65b0\u589e\u6216\u4fee\u6539\u5b9e\u4f53\u5bf9\u8c61\u3002<\/li>\n<li><code>saveOrUpdate(T, Wrapper&lt;T&gt;)<\/code> \uff1a\u65b0\u589e\u6216\u4fee\u6539\u5b9e\u4f53\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5b9a\u4e49\u67e5\u8be2\u6761\u4ef6\uff0c\u4e0d\u518d\u662f\u9ed8\u8ba4id\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.2 \u5220\u9664\u63a5\u53e3<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125047308.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125047308.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>removeById(Serializable)<\/code> \uff1a\u6839\u636eID\u5220\u9664\u6570\u636e\u3002<\/li>\n<li><code>removeById(Serializable, boolean)<\/code> \uff1a\u6839\u636eID\u5220\u9664\u6570\u636e\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u63a7\u5236\u903b\u8f91\u5220\u9664\u6216\u8005\u7269\u7406\u5220\u9664\u3002\n<ul>\n<li>\u7b2c\u4e8c\u4e2aboolean\u53c2\u6570\uff1a<code>true<\/code>\uff1a\u903b\u8f91\u5220\u9664\uff0c\u66f4\u65b0\u914d\u7f6e\u7684[\u903b\u8f91\u5220\u9664\u5b57\u6bb5]\u4e3a[\u903b\u8f91\u5220\u9664\u503c]\uff1b<code>false<\/code>\uff1a\u7269\u7406\u5220\u9664\u3002<\/li>\n<\/ul>\n<\/li>\n<li><code>removeById(T)<\/code> \uff1a\u8bc6\u522b\u5b9e\u4f53\u5bf9\u8c61\u7684\u4e3b\u952e\u8fdb\u884c\u5220\u9664\u3002<\/li>\n<li><code>removeByMap(Map&lt;String, Object&gt;)<\/code> \uff1a\u6839\u636e\u7ed9\u5b9a\u7684\u6761\u4ef6\u6620\u5c04\u6765\u6784\u5efa<code>WHERE<\/code>\u5b50\u53e5\u5220\u9664\u6570\u636e\u3002<\/li>\n<li><code>remove(Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u7ed9\u5b9a\u7684<code>WHERE<\/code>\u5b50\u53e5\u5220\u9664\u6570\u636e\u3002<\/li>\n<li><code>removeByIds(Collection&lt;?&gt;)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\uff08\u9002\u5408\u4e3b\u952e\u96c6\u5408\u5143\u7d20\u8f83\u5c11\u65f6\u4f7f\u7528\uff0c\u91c7\u7528<code>DELETE<\/code>+<code>ID IN<\/code>\uff09<\/li>\n<li><code>removeByIds(Collection&lt;?&gt;, boolean)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u63a7\u5236<code>true<\/code>\uff08\u903b\u8f91\u5220\u9664\uff09\/<code>false<\/code>\uff08\u7269\u7406\u5220\u9664\uff09<\/li>\n<li><code>removeBatchByIds(Collection&lt;?&gt;)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u5206\u6279\u6b21\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\uff08\u9002\u5408\u4e3b\u952e\u96c6\u5408\u5143\u7d20\u8f83\u591a\u65f6\u4f7f\u7528\uff0c\u91c7\u7528<code>DELETE<\/code>+<code>ID=?<\/code> \uff0c\u4f1a\u91c7\u7528JDBC\u6279\u5904\u7406\u65b9\u6848\uff09<\/li>\n<li><code>removeBatchByIds(Collection&lt;?&gt;, boolean)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u5206\u6279\u6b21\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6548\u679c\u540c\u4e0a\u3002<\/li>\n<li><code>removeBatchByIds(Collection&lt;?&gt;, int)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u5206\u6279\u6b21\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\u7b2c\u4e8c\u4e2a\u5143\u7d20\u63a7\u5236\u6bcf\u6279\u6b21\u6570\u91cf\u3002<\/li>\n<li><code>removeBatchByIds(Collection&lt;?&gt;, int, boolean)<\/code> \uff1a\u6839\u636e\u4e3b\u952e\u96c6\u5408\u5206\u6279\u6b21\u6279\u91cf\u5220\u9664\u6570\u636e\u3002\u7b2c\u4e8c\u4e2a\u5143\u7d20\u63a7\u5236\u6bcf\u6279\u6b21\u6570\u91cf\u3002\u7b2c\u4e09\u4e2a\u53c2\u6570\u63a7\u5236<code>true<\/code>\uff08\u903b\u8f91\u5220\u9664\uff09\/<code>false<\/code>\uff08\u7269\u7406\u5220\u9664\uff09\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.3 \u4fee\u6539\u63a5\u53e3<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125048390.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125048390.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li>\u524d\u4e24\u4e2a\u548c\u6700\u540e\u4e00\u4e2a\u5c31\u4e0d\u8bf4\u4e86\uff0c\u65b0\u589e\u63a5\u53e3\u65f6\u5df2\u7ecf\u4ecb\u7ecd\u4e86<\/li>\n<li><code>updateById(T)<\/code> \uff1a\u6839\u636eID\u8fdb\u884c\u4fee\u6539\uff0c\u5b9e\u4f53\u5bf9\u8c61\u53ea\u8981\u975e\u7a7a\u5c31\u4f1a\u4fee\u6539\u3002<\/li>\n<li><code>update(Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u8fdb\u884c\u4fee\u6539\uff0c\u5b9e\u4f53\u5bf9\u8c61\u53ea\u8981\u975e\u7a7a\u5c31\u4f1a\u4fee\u6539\u3002<\/li>\n<li><code>update(T, Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u5bf9\u5b9e\u4f53\u5bf9\u8c61\u8fdb\u884c\u4fee\u6539\u3002<\/li>\n<li><code>updateBatchById(Collection&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u4e3b\u952eID\u6279\u91cf\u4fee\u6539\u3002<\/li>\n<li><code>updateBatchById(Collection&lt;T&gt;, int)<\/code> \uff1a\u6839\u636e\u4e3b\u952eID\u5206\u6279\u6b21\u6279\u91cf\u4fee\u6539\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5b9a\u4e49\u6bcf\u6279\u6b21\u6570\u91cf\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.4 \u67e5\u8be2\u63a5\u53e3\uff08\u67e5\u4e00\u4e2a\uff09<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125049889.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125049889.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>getById(Serializable)<\/code> \uff1a\u6839\u636e\u4e3b\u952eID\u67e5\u8be2\u3002<\/li>\n<li><code>getOne(Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u67e5\u8be2\u3002\u9700\u8981\u4fdd\u8bc1\u6784\u9020\u6761\u4ef6\u53ea\u80fd\u67e5\u5230\u4e00\u4e2a\uff0c\u5426\u5219\u4f1a\u5f02\u5e38\u3002<\/li>\n<li><code>getOne(Wrapper&lt;T&gt;, boolean)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u67e5\u8be2\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff1a\u63a7\u5236\u5f02\u5e38\u629b\u51fa\n<ul>\n<li>\u5982\u679c\u67e5\u8be2\u5230\u4e0d\u6b62\u4e00\u6761\u6570\u636e\uff0c\u6b63\u5e38\u7a0b\u5e8f\u4f1a\u629b\u51fa<code>TooManyResultsException<\/code>\u5f02\u5e38\u3002<\/li>\n<li><code>true<\/code> \uff1a\u4f1a\u629b\u51fa\u5f02\u5e38\uff1b<\/li>\n<li><code>false<\/code> \uff1a\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u4f1a\u8fd4\u56de\u7b2c\u4e00\u6761\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.5 \u67e5\u8be2\u63a5\u53e3\uff08\u67e5\u7edf\u8ba1\uff09<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125051457.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125051457.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>count()<\/code> \uff1a\u67e5\u8be2\u7edf\u8ba1\u603b\u6570<\/li>\n<li><code>count(Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u67e5\u8be2\u7edf\u8ba1\u603b\u6570<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.6 \u67e5\u8be2\u63a5\u53e3\uff08\u67e5\u591a\u4e2a\/\u5217\u8868\uff09<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125052925.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125052925.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>listByIds(Collection&lt;? extends Serializable&gt;)<\/code> \uff1a\u6839\u636eID\u96c6\u5408\u67e5\u8be2\u3002<\/li>\n<li><code>listByMap(Map&lt;String, Object&gt;)<\/code> \uff1a\u6839\u636e\u7ed9\u5b9a\u7684\u6761\u4ef6\u6620\u5c04\u4f5c\u4e3a <code>WHERE<\/code> \u6761\u4ef6\u67e5\u8be2<\/li>\n<li><code>list(Wrapper&lt;T&gt;)<\/code> \uff1a\u6839\u636e\u6784\u9020\u6761\u4ef6\u67e5\u8be2<\/li>\n<li><code>list()<\/code> \uff1a\u67e5\u8be2\u6240\u6709\u6570\u636e<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.7 \u67e5\u8be2\u63a5\u53e3\uff08\u5206\u9875\u67e5\u8be2\uff09<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125055783.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125055783.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li><code>page(E, Wrapper&lt;T&gt;)<\/code> \uff1a\u5206\u9875\u67e5\u8be2\u3002\n<ul>\n<li><code>E<\/code> \uff1a\u5206\u9875\u5bf9\u8c61\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0<code>IPage<\/code> \u63a5\u53e3\uff0c\u5e38\u7528<code>Page<\/code> \u7c7b\uff0c\u67e5\u8be2\u7ed3\u679c\u4e5f\u4f1a\u5c01\u88c5\u5230\u8fd9\u4e2a\u5bf9\u8c61\u4e2d\u3002<\/li>\n<li><code>Wrapper&lt;T&gt;<\/code> \uff1a\u6784\u9020\u67e5\u8be2\u6761\u4ef6<\/li>\n<\/ul>\n<\/li>\n<li><code>page(E)<\/code> \uff1a\u6ca1\u6709\u67e5\u8be2\u6761\u4ef6\uff0c\u76f4\u63a5\u5206\u9875\u67e5\u8be2\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.1.8 Lambda\u63a5\u53e3<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125053311.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125053311.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u57fa\u4e8e\u8fd9\u79cdLambda\u7684\u63a5\u53e3\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u94fe\u5f0f\u7f16\u7a0b\u65b9\u5f0f\uff0c\u4e0d\u7528\u81ea\u5df1\u53bb <code>new<\/code> \u4e00\u4e2a <code>Wrapper<\/code> \u3002<\/p>\n<p>\u5efa\u8bae\uff1a<\/p>\n<p>\u5982\u679c\u662f\u57fa\u4e8eID\u7b49\u7684\u7b80\u5355\u67e5\u8be2\u6216\u66f4\u65b0\u5c31\u7528\u524d\u9762\u7684\u65b9\u6cd5\uff1b<\/p>\n<p>\u5982\u679c\u662f\u590d\u6742\u67e5\u8be2\uff0c\u90a3\u4e48\u53ef\u4ee5\u4f7f\u7528lambda\u8fdb\u884c\u94fe\u5f0f\u7f16\u7a0b\u67e5\u8be2\u3002<\/p>\n<ul>\n<li><code>lambdaQuery()<\/code> \uff1a\u521b\u5efa\u4e00\u4e2a\u57fa\u4e8e Lambda \u8868\u8fbe\u5f0f\u7684\u67e5\u8be2\u6761\u4ef6\u6784\u9020\u5668 <code>LambdaQueryWrapper<\/code><\/li>\n<li><code>lambdaQuery(T)<\/code> \uff1a\u521b\u5efa\u57fa\u4e8e Lambda \u8868\u8fbe\u5f0f\u7684\u67e5\u8be2\u6761\u4ef6\u6784\u9020\u5668\u3002\u6784\u9020\u5668\u4f1a\u6839\u636e\u5b9e\u4f53\u5bf9\u8c61\u4e2d\u4e0d\u4e3a <code>null<\/code> \u7684\u5c5e\u6027\u81ea\u52a8\u751f\u6210\u7b49\u503c\u67e5\u8be2\u6761\u4ef6\u3002<\/li>\n<li><code>lambdaUpdate()<\/code> \uff1a\u521b\u5efa\u4e00\u4e2a\u57fa\u4e8e Lambda \u8868\u8fbe\u5f0f\u7684\u66f4\u65b0\u6761\u4ef6\u6784\u9020\u5668 <code>LambdaUpdateWrapper<\/code>\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h2>1.2 IService\u7684\u4f7f\u7528<\/h2>\n<p>\u7ee7\u627f\u548c\u5b9e\u73b0\u903b\u8f91\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125056426.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125056426.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.2.1 \u521b\u5efa\u81ea\u5b9a\u4e49Service\u63a5\u53e3<\/h3>\n<p>\u81ea\u5b9a\u4e49\u63a5\u53e3\u7ee7\u627f<code>IService<\/code> \u5373\u53ef\uff0c\u9700\u8981\u7ed9\u51fa <code>User<\/code> \u7684\u6cdb\u578b\u3002<\/p>\n<pre><code class=\"language-java\">package com.itheima.mp.service;\n\nimport com.baomidou.mybatisplus.extension.service.IService;\nimport com.itheima.mp.domain.po.User;\n\npublic interface IUserService extends IService&lt;User&gt; {\n\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.2.2 \u521b\u5efa\u81ea\u5b9a\u4e49Service\u5b9e\u73b0\u7c7b<\/h3>\n<p>\u81ea\u5b9a\u4e49\u63a5\u53e3\u5b9e\u73b0\u7c7b\uff0c\u5b9e\u73b0\u81ea\u5b9a\u4e49\u63a5\u53e3<code>UserService<\/code> \uff0c\u5e76\u7ee7\u627f<code>ServiceImpl<\/code> \u7c7b\u5e76\u7ed9\u51fa\u4e24\u4e2a\u6cdb\u578b\uff1a<code>UserMapper<\/code> \u548c <code>User<\/code>\u3002<\/p>\n<p><code>ServiceImpl<\/code> \u901a\u8fc7<code>UserMapper<\/code> \u8c03\u7528\u5b83\u7ee7\u627f\u7684<code>BaseMapper<\/code> \u4e2d\u7684\u65b9\u6cd5\u3002<\/p>\n<pre><code class=\"language-java\">package com.itheima.mp.service.impl;\n\nimport com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\nimport com.itheima.mp.domain.po.User;\nimport com.itheima.mp.mapper.UserMapper;\nimport com.itheima.mp.service.IUserService;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class UserServiceImpl extends ServiceImpl&lt;UserMapper, User&gt; implements IUserService {\n\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.2.3 \u6d4b\u8bd5 &#8211; \u5355\u4e2a\u65b0\u589e<\/h3>\n<pre><code class=\"language-java\">package com.itheima.mp.service;\n\nimport com.itheima.mp.domain.po.User;\nimport org.junit.jupiter.api.Test;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.boot.test.context.SpringBootTest;\nimport java.time.LocalDateTime;\n\n@SpringBootTest\nclass IUserServiceTest {\n\n    @Autowired\n    private IUserService userService;\n\n    @Test\n    void testSaveUser() {\n        User user = new User();\n        user.setId(6L);\n        user.setUsername(&quot;\u674e\u767d&quot;);\n        user.setPassword(&quot;123456&quot;);\n        user.setPhone(&quot;18688990012&quot;);\n        user.setBalance(10086);\n        user.setInfo(&quot;{\\&quot;age\\&quot;: 1324, \\&quot;intro\\&quot;: \\&quot;\u8bd7\u8bcd\u8001\u5e08\\&quot;, \\&quot;gender\\&quot;: \\&quot;male\\&quot;}&quot;);\n        user.setCreateTime(LocalDateTime.now());\n        user.setUpdateTime(LocalDateTime.now());\n        userService.save(user);\n    }\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<p>\u8fd9\u91cc\u6d4b\u8bd5\u4e86\u4e00\u4e2a <code>save(Entity)<\/code> \u7684\u63a5\u53e3\u65b9\u6cd5\u3002<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n<p>\u200b   \u6210\u529f\u6dfb\u52a0\u6570\u636e\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125057350.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125057350.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h3>1.2.4 \u6d4b\u8bd5 &#8211; \u67e5\u8be2\u5217\u8868<\/h3>\n<pre><code class=\"language-java\">    @Test\n    void testQueryByIds() {\n        List&lt;Long&gt; idList = List.of(1L, 3L, 6L);\n        List&lt;User&gt; users = userService.listByIds(idList);\n        users.forEach(System.out::println);\n    }<\/code><\/pre>\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125058215.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125058215.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h2>1.3 \u603b\u7ed3<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125100871.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250305125100871.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h1>\u4e8c\u3001IService \u5f00\u53d1\u57fa\u7840\u4e1a\u52a1\u63a5\u53e3<\/h1>\n<h2>2.1 \u901a\u8fc7\u6848\u4f8b\u5b66\u4e60<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250310125434215.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250310125434215.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u672c\u8282\u53ea\u5b66\u4e601-4\u9879\uff0c\u7b2c\u4e94\u9879\u4e3a\u7b2c\u4e09\u8282\u5b66\u4e60\uff0c\u4e3a\u590d\u6742\u4e1a\u52a1\u63a5\u53e3\u3002<\/p>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.2 \u5f15\u5165\u4f9d\u8d56<\/h2>\n<p>\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u5b9e\u73b0Restful\u98ce\u683c\u7684\u63a5\u53e3\uff0c\u6240\u4ee5\u9700\u8981\u5f15\u5165web\u4f9d\u8d56\u3002<\/p>\n<p>\u7136\u540e\u4e3a\u4e86\u65b9\u4fbf\u6d4b\u8bd5\uff0c\u6211\u4eec\u4f7f\u7528swagger\u8fdb\u884c\u6d4b\u8bd5\u63a5\u53e3\uff0c\u7136\u540e\u9700\u8981\u5f15\u5165swagger\u4f9d\u8d56\u3002<\/p>\n<p>pom.xml\u4e2d\u52a0\u5165\u5982\u4e0b\u4f9d\u8d56\uff1a<\/p>\n<pre><code class=\"language-xml\">        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;\/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-web&lt;\/artifactId&gt;\n        &lt;\/dependency&gt;\n\n        &lt;dependency&gt;\n            &lt;groupId&gt;com.github.xiaoymin&lt;\/groupId&gt;\n            &lt;artifactId&gt;knife4j-openapi2-spring-boot-starter&lt;\/artifactId&gt;\n            &lt;version&gt;4.1.0&lt;\/version&gt;\n        &lt;\/dependency&gt;<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.3 \u505aswagger\u7684\u914d\u7f6e<\/h2>\n<p>\u5728application.yml\u6587\u4ef6\u4e2d\u65b0\u589e\uff1a<\/p>\n<pre><code class=\"language-yml\">knife4j:\n  enable: true # \u5f00\u542f\n  openapi:\n    title: \u7528\u6237\u7ba1\u7406\u63a5\u53e3\u6587\u6863\n    description: &quot;\u7528\u6237\u7ba1\u7406\u63a5\u53e3\u6587\u6863&quot;\n    email: 2451203736@qq.com\n    concat: \u9676\u5176\n    url: https:\/\/www.tqazy.com\n    version: v1.0.0\n    group:\n      default:\n        group-name: default\n        api-rule: package\n        api-rule-resources:\n          - com.itheima.mp.controller<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<p>\u987a\u4fbf\u5c06mybatis\u7684\u914d\u7f6e\u6539\u6210mybatis-plus\u7684\uff1a<\/p>\n<pre><code class=\"language-yml\">mybatis-plus:\n  type-aliases-package: com.tiheima.mp.domain.po\n  global-config:\n    db-config:\n      id-type: auto # ID\u81ea\u589e<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.4 \u5bfc\u5165dto\u6587\u4ef6\u548cvo\u6587\u4ef6<\/h2>\n<p>UserFormDTO.java<\/p>\n<pre><code class=\"language-java\">package com.itheima.mp.domain.dto;\n\nimport io.swagger.annotations.ApiModel;\nimport io.swagger.annotations.ApiModelProperty;\nimport lombok.Data;\n\n@Data\n@ApiModel(description = &quot;\u7528\u6237\u8868\u5355\u5b9e\u4f53&quot;)\npublic class UserFormDTO {\n\n    @ApiModelProperty(&quot;id&quot;)\n    private Long id;\n\n    @ApiModelProperty(&quot;\u7528\u6237\u540d&quot;)\n    private String username;\n\n    @ApiModelProperty(&quot;\u5bc6\u7801&quot;)\n    private String password;\n\n    @ApiModelProperty(&quot;\u6ce8\u518c\u624b\u673a\u53f7&quot;)\n    private String phone;\n\n    @ApiModelProperty(&quot;\u8be6\u7ec6\u4fe1\u606f\uff0cJSON\u98ce\u683c&quot;)\n    private String info;\n\n    @ApiModelProperty(&quot;\u8d26\u6237\u4f59\u989d&quot;)\n    private Integer balance;\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<p>UserVo<\/p>\n<pre><code class=\"language-java\">package com.itheima.mp.domain.vo;\n\nimport io.swagger.annotations.ApiModel;\nimport io.swagger.annotations.ApiModelProperty;\nimport lombok.Data;\n\n@Data\n@ApiModel(description = &quot;\u7528\u6237VO\u5b9e\u4f53&quot;)\npublic class UserVO {\n\n    @ApiModelProperty(&quot;\u7528\u6237id&quot;)\n    private Long id;\n\n    @ApiModelProperty(&quot;\u7528\u6237\u540d&quot;)\n    private String username;\n\n    @ApiModelProperty(&quot;\u8be6\u7ec6\u4fe1\u606f&quot;)\n    private String info;\n\n    @ApiModelProperty(&quot;\u4f7f\u7528\u72b6\u6001\uff081\u6b63\u5e38 2\u51bb\u7ed3\uff09&quot;)\n    private Integer status;\n\n    @ApiModelProperty(&quot;\u8d26\u6237\u4f59\u989d&quot;)\n    private Integer balance;\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.5 \u521b\u5efa\u5e76\u7f16\u5199\u63a7\u5236\u5c42<\/h2>\n<p>UserController.java<\/p>\n<pre><code class=\"language-java\">import cn.hutool.core.bean.BeanUtil;\nimport com.itheima.mp.domain.dto.UserFormDTO;\nimport com.itheima.mp.domain.po.User;\nimport com.itheima.mp.domain.vo.UserVO;\nimport com.itheima.mp.service.IUserService;\nimport io.swagger.annotations.Api;\nimport io.swagger.annotations.ApiOperation;\nimport io.swagger.annotations.ApiParam;\nimport lombok.RequiredArgsConstructor;\nimport org.springframework.web.bind.annotation.*;\nimport javax.annotation.Resource;\nimport java.util.List;\n\n@Api(tags = &quot;\u7528\u6237\u7ba1\u7406\u63a5\u53e3&quot;)\n@RequestMapping(&quot;\/users&quot;)\n@RestController\n@RequiredArgsConstructor\npublic class UserController {\n\n    private final IUserService userService;\n\n    @ApiOperation(&quot;\u65b0\u589e\u7528\u6237\u63a5\u53e3&quot;)\n    @PostMapping\n    public void saveUser(@RequestBody UserFormDTO userDTO) {\n        \/\/ 1. \u628aDTO\u62f7\u8d1d\u5230PO\n        User user = BeanUtil.copyProperties(userDTO, User.class);\n        \/\/ 2. \u65b0\u589e\n        userService.save(user);\n    }\n\n    @ApiOperation(&quot;\u5220\u9664\u7528\u6237\u63a5\u53e3&quot;)\n    @DeleteMapping(&quot;{id}&quot;)\n    public void deleteUserById(@ApiParam(&quot;\u7528\u6237id&quot;) @PathVariable(&quot;id&quot;) Long id) {\n        userService.removeById(id, true);\n    }\n\n    @ApiOperation(&quot;\u6839\u636eid\u67e5\u8be2\u7528\u6237&quot;)\n    @GetMapping(&quot;{id}&quot;)\n    public UserVO getUserById (@ApiParam(&quot;\u7528\u6237id&quot;) @PathVariable(&quot;id&quot;) Long id) {\n        User user = userService.getById(id);\n        return BeanUtil.copyProperties(user, UserVO.class);\n    }\n\n    @ApiOperation(&quot;\u6839\u636eid\u6279\u91cf\u67e5\u8be2&quot;)\n    @GetMapping\n    public List&lt;UserVO&gt; getAllUser(@ApiParam(&quot;\u7528\u6237id\u96c6\u5408&quot;) @RequestParam(&quot;idList&quot;) List&lt;Long&gt; idList) {\n        List&lt;User&gt; users = userService.listByIds(idList);\n        return BeanUtil.copyToList(users, UserVO.class);\n    }\n}\n<\/code><\/pre>\n<p><strong>\u4ee3\u7801\u6ce8\u89e3\uff1a<\/strong><\/p>\n<ul>\n<li><code>@RequiredArgsConstructor<\/code> : \u914d\u5408<code>private final IUserService userService;<\/code>\u4e2d<code>final<\/code>\uff0c\u53ef\u4ee5\u5b9e\u73b0<strong>\u5fc5\u987b\u7684\u4f9d\u8d56\u901a\u8fc7\u6784\u9020\u51fd\u6570\u6ce8\u5165<\/strong>\uff0c\u5fc5\u987b\u7684\u4f9d\u8d56\u4f7f\u7528<code>final<\/code>\u5173\u952e\u5b57\u4fee\u9970\u3002\u6bd4<code>@Resources<\/code>\u66f4\u63a8\u8350\u4f7f\u7528\uff0c<code>@Resources<\/code>\u662fJavaEE\u7684\u6ce8\u89e3\uff0c\u66f4\u63a8\u8350Spring\u7684\u6ce8\u89e3\u3002<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.6 \u521b\u5efa\u5e76\u7f16\u5199\u903b\u8f91\u5c42<\/h2>\n<p>IUserService.java<\/p>\n<pre><code class=\"language-java\">public interface IUserService extends IService&lt;User&gt; {\n\n}<\/code><\/pre>\n<p>UserServiceImpl.java<\/p>\n<pre><code class=\"language-java\">@Service\npublic class UserServiceImpl extends ServiceImpl&lt;UserMapper, User&gt; implements IUserService {\n\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.7 \u521b\u5efa\u5e76\u7f16\u5199\u6301\u4e45\u5c42<\/h2>\n<p>UserMapper.java<\/p>\n<pre><code class=\"language-java\">public interface UserMapper extends BaseMapper&lt;User&gt;{\n\n}<\/code><\/pre>\n<p>UserMapper.xml<\/p>\n<pre><code class=\"language-xml\">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;\n&lt;!DOCTYPE mapper PUBLIC &quot;-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN&quot; &quot;http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd&quot;&gt;\n&lt;mapper namespace=&quot;com.itheima.mp.mapper.UserMapper&quot;&gt;\n\n&lt;\/mapper&gt;<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>2.8 \u8fd0\u884c<\/h2>\n<p>\u542f\u52a8\u9879\u76ee\uff0c\u6253\u5f00\u6d4f\u89c8\u5668\u8bbf\u95ee\uff1a127.0.0.1:8080\/doc.html\u3002<\/p>\n<h3>2.8.1 \u65b0\u589e\u7528\u6237<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070141882.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070141882.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070202727.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070202727.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h3>2.8.2 \u6839\u636eid\u67e5\u8be2\u7528\u6237<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070235674.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070235674.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h3>2.8.3 \u6839\u636eid\u6279\u91cf\u67e5\u8be2<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070303516.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070303516.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h3>2.8.4 \u5220\u9664\u7528\u6237<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070353771.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070353771.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070401507.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070401507.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h1>\u4e09\u3001IService\u5f00\u53d1\u590d\u6742\u4e1a\u52a1\u63a5\u53e3<\/h1>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070618966.png'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313070618966.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u5c06\u4e0a\u9762\u5df2\u5220\u9664\u7684\u6570\u636e\u518d\u52a0\u56de\u3002<\/p>\n<h2>3.1 \u63a7\u5236\u5c42<\/h2>\n<p>UserController.java<\/p>\n<pre><code class=\"language-java\">    @ApiOperation(&quot;\u6839\u636eid\u6263\u51cf\u4f59\u989d&quot;)\n    @PostMapping(&quot;\/{id}\/deduction\/{money}&quot;)\n    public String deductionMoneyById(@ApiParam(&quot;\u7528\u6237id&quot;) @PathVariable(&quot;id&quot;) Long id, @ApiParam(&quot;\u6263\u51cf\u91d1\u989d&quot;) @PathVariable(&quot;money&quot;) int money) {\n        return userService.deductionMoneyById(id, money);\n    }<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>3.2 \u903b\u8f91\u5c42<\/h2>\n<p>IUserService.java<\/p>\n<pre><code class=\"language-java\">public interface IUserService extends IService&lt;User&gt; {\n\n    String deductionMoneyById(Long id, int money);\n\n}<\/code><\/pre>\n<p>UserServiceImpl.java<\/p>\n<pre><code class=\"language-java\">@Service\npublic class UserServiceImpl extends ServiceImpl&lt;UserMapper, User&gt; implements IUserService {\n\n    @Resource\n    private UserMapper userMapper;\n\n    @Override\n    public String deductionMoneyById(Long id, int money) {\n        if(id != null) {\n            User user = getById(id); \/\/ \u8c03\u7684\u662fServiceImpl\u7684\u65b9\u6cd5\n            if (user != null) {\n                if (!user.getStatus().equals(1)) {\n                    return &quot;\u7528\u6237\u72b6\u6001\u4e3a\u975e\u6b63\u5e38\u72b6\u6001\uff0c\u6263\u6b3e\u5931\u8d25\uff01&quot;;\n                } else if (user.getBalance() &lt;= money) {\n                    return &quot;\u7528\u6237\u4f59\u989d\u4e0d\u8db3\uff0c\u6263\u6b3e\u5931\u8d25\uff01\u73b0\u6709\u4f59\u989d\u4e3a\uff1a&quot; + user.getBalance();\n                } else {\n                    userMapper.deductionMoneyById(id, money);\n                    user = getById(id);\n                    return &quot;\u6263\u6b3e\u6210\u529f\uff01\u73b0\u6709\u4f59\u989d\u4e3a\uff1a&quot; + user.getBalance();\n                }\n            } else {\n                return &quot;\u67e5\u8be2\u7528\u6237\u4e0d\u5b58\u5728\uff01&quot;;\n            }\n        } else {\n            return &quot;\u53c2\u6570ID\u4e3a\u7a7a\uff01&quot;;\n        }\n    }\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>3.3 \u6301\u4e45\u5c42<\/h2>\n<p>UserMapper.java<\/p>\n<pre><code class=\"language-java\">    @Update(&quot;UPDATE user SET balance = balance - #{money} WHERE id = #{id}&quot;)\n    void deductionMoneyById(@Param(&quot;id&quot;) Long id, @Param(&quot;money&quot;) int money);<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h2>3.4 \u8fd0\u884c<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071143241.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071143241.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071155238.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071155238.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071209339.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071209339.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071221907.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071221907.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071233356.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313071233356.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<div style=\"height:1.5em\"><\/div>\n<h1>\u56db\u3001IService \u7684 lambda \u65b9\u6cd5<\/h1>\n<h2>4.1 lambda\u7684\u67e5\u8be2\u65b9\u6cd5<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313084058858.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313084058858.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u5982\u679c\u6309\u7167Mybatis\u7684\u5199\u6cd5\uff0c\u9700\u8981\u5728UserMapper.xml\u5199\u5982\u4e0bSQL\u8bed\u53e5\uff1a<\/p>\n<pre><code class=\"language-xml\">    &lt;select id=&quot;queryUsers&quot; resultType=&quot;com.itheima.mp.domain.po.User&quot;&gt;\n        SELECT *\n        FROM user\n        &lt;where&gt;\n            &lt;if test=&quot;name != null&quot;&gt;\n                AND username LIKE #{name}\n            &lt;\/if&gt;\n            &lt;if test=&quot;status != null&quot;&gt;\n                AND `status` = #{status}\n            &lt;\/if&gt;\n            &lt;if test=&quot;minBalance != null&quot;&gt;\n                AND balance &gt;= #{minBalance}\n            &lt;\/if&gt;\n            &lt;if test=&quot;maxBalance != null&quot;&gt;\n                AND balance &lt;= #{maxBalance}\n            &lt;\/if&gt;\n        &lt;\/where&gt;\n    &lt;\/select&gt;<\/code><\/pre>\n<h3>4.1.1 \u5bfc\u5165\u67e5\u8be2\u6761\u4ef6\u5b9e\u4f53\u7c7b<\/h3>\n<p>UserQuery.java<\/p>\n<pre><code class=\"language-java\">import io.swagger.annotations.ApiModel;\nimport io.swagger.annotations.ApiModelProperty;\nimport lombok.Data;\n\n@Data\n@ApiModel(description = &quot;\u7528\u6237\u67e5\u8be2\u6761\u4ef6\u5b9e\u4f53&quot;)\npublic class UserQuery {\n    @ApiModelProperty(&quot;\u7528\u6237\u540d\u5173\u952e\u5b57&quot;)\n    private String name;\n    @ApiModelProperty(&quot;\u7528\u6237\u72b6\u6001\uff1a1-\u6b63\u5e38\uff0c2-\u51bb\u7ed3&quot;)\n    private Integer status;\n    @ApiModelProperty(&quot;\u4f59\u989d\u6700\u5c0f\u503c&quot;)\n    private Integer minBalance;\n    @ApiModelProperty(&quot;\u4f59\u989d\u6700\u5927\u503c&quot;)\n    private Integer maxBalance;\n}<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<h3>4.1.2 \u63a7\u5236\u5c42<\/h3>\n<p>UserController.java<\/p>\n<pre><code class=\"language-java\">    @ApiOperation(&quot;\u6839\u636e\u6761\u4ef6\u6279\u91cf\u67e5\u8be2&quot;)\n    @GetMapping(&quot;\/list&quot;)\n    public List&lt;UserVO&gt; queryUsers(@ApiParam(&quot;\u7528\u6237\u67e5\u8be2\u6761\u4ef6&quot;) UserQuery query) {\n        List&lt;User&gt; users = userService.queryUsers(\n                query.getName(), query.getStatus(), query.getMinBalance(), query.getMaxBalance());\n        return BeanUtil.copyToList(users, UserVO.class);\n    }<\/code><\/pre>\n<p>GET \u8bf7\u6c42\u63a5\u6536\u53c2\u6570\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u5b9e\u4f53\u7c7b\u63a5\u6536\uff0c\u65e0\u9700\u52a0\u6ce8\u89e3\u3002<\/p>\n<div style=\"height:1.5em\"><\/div>\n<h3>4.1.3 \u903b\u8f91\u5c42<\/h3>\n<p>IUserService.java<\/p>\n<pre><code class=\"language-java\">List&lt;User&gt; queryUsers(String name, Integer status, Integer minBalance, Integer maxBalance);<\/code><\/pre>\n<div style=\"height:1.5em\"><\/div>\n<p>UserServiceImpl.java<\/p>\n<pre><code class=\"language-java\">    @Override\n    public List&lt;User&gt; queryUsers(String name, Integer status, Integer minBalance, Integer maxBalance) {\n        return lambdaQuery()\n                .like(name != null, User::getUsername, name)\n                .eq(status != null, User::getStatus, status)\n                .ge(minBalance != null, User::getBalance, minBalance)\n                .le(maxBalance != null, User::getBalance, maxBalance)\n                .list();\n    }<\/code><\/pre>\n<p><strong>\u4ee3\u7801\u89e3\u6790\uff1a<\/strong><\/p>\n<ul>\n<li><code>lambdaQuery()<\/code> \uff1a<code>default LambdaQueryChainWrapper&lt;T&gt; lambdaQuery()<\/code>\uff0c\u94fe\u5f0f\u67e5\u8be2 lambda \u5f0f\u3002<\/li>\n<li><code>.like(name != null, User::getUsername, name)<\/code> \uff1a\u6a21\u7cca\u67e5\u8be2\uff0c\u7b2c\u4e00\u53c2\u6570\u4e3atrue\u65f6\u6b64\u9879\u624d\u7b97\u5165\u67e5\u8be2\u6761\u4ef6\uff1b<\/li>\n<li><code>.eq(status != null, User::getStatus, status)<\/code> \uff1a\u7cbe\u51c6\u67e5\u8be2\uff0c\u7b2c\u4e00\u53c2\u6570\u6548\u679c\u540c\u4e0a\uff1b<\/li>\n<li><code>.ge(minBalance != null, User::getBalance, minBalance)<\/code> \uff1a\u5b57\u6bb5\u503c\u5927\u4e8e\u7b49\u4e8e\u53c2\u6570\u503c \u67e5\u8be2\uff0c\u7b2c\u4e00\u53c2\u6570\u6548\u679c\u540c\u4e0a\uff1b<\/li>\n<li><code>.le(maxBalance != null, User::getBalance, maxBalance)<\/code> \uff1a\u5b57\u6bb5\u503c\u5c0f\u4e8e\u7b49\u4e8e\u53c2\u6570\u503c \u67e5\u8be2\uff0c\u7b2c\u4e00\u53c2\u6570\u6548\u679c\u540c\u4e0a\uff1b<\/li>\n<li><code>.list()<\/code> \uff1a\u67e5\u8be2\u5217\u8868\uff0c\u8fd4\u56de <code>List&lt;T&gt;<\/code>\u3002\u8fd8\u53ef\u4ee5\u9009\uff1a\n<ul>\n<li><code>one()<\/code>\uff1a\u67e5\u8be2\u4e00\u6761\u8bb0\u5f55\uff0c\u8fd4\u56de <code>&lt;T&gt;<\/code>\uff1b<\/li>\n<li><code>count()<\/code>\uff1a\u67e5\u8be2\u7edf\u8ba1\u6761\u6570\uff0c\u8fd4\u56de <code>Long<\/code>\uff1b<\/li>\n<li><code>page()<\/code> \uff1a\u5206\u9875\u67e5\u8be2\uff0c\u8fd4\u56de <code>E page<\/code>\uff1b<\/li>\n<li><code>exists()<\/code>\uff1a\u67e5\u8be2\u662f\u5426\u5b58\u5728\u6570\u636e\uff0c\u8fd4\u56de <code>boolean<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div style=\"height:1.5em\"><\/div>\n<h3>4.1.4 \u8fd0\u884c<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313085547602.jpg'><img class=\"lazyload lazyload-style-6\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/oss.tqazy.com\/wordpress\/autoFile\/2025\/03\/20250313085547602.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u672a\u5b8c\u5f85\u7eed\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b66\u4e60MP\u7684IService\u63a5\u53e3\uff1a IService\u63a5\u53e3\u57fa\u672c\u7528\u6cd5\u3001IService\u5f00\u53d1\u57fa\u7840\u4e1a\u52a1\u63a5\u53e3\u3001IService\u5f00\u53d1\u590d\u6742\u4e1a\u52a1\u63a5\u53e3\u3001IService\u7684lambda\u65b9\u6cd5\u3001IService\u6279\u91cf\u65b0\u589e<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102,110],"tags":[111],"class_list":["post-1585","post","type-post","status-publish","format-standard","hentry","category-spring_boot","category-heima_mall","tag-mybatisplus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MybatisPlus\uff08\u4e8c\uff09\u6838\u5fc3\u529f\u80fd03 \u2014 IService\u63a5\u53e3 | \u9676\u5176\u7684\u4e2a\u4eba\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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