{"id":67734,"date":"2026-01-29T04:49:34","date_gmt":"2026-01-28T20:49:34","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/67734.html"},"modified":"2026-01-29T04:49:34","modified_gmt":"2026-01-28T20:49:34","slug":"mybatis%e5%bb%b6%e8%bf%9f%e5%8a%a0%e8%bd%bd","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/67734.html","title":{"rendered":"Mybatis\u5ef6\u8fdf\u52a0\u8f7d"},"content":{"rendered":"

MyBatis\u4e2d\u7684\u5ef6\u8fdf\u52a0\u8f7d\u673a\u5236：\u539f\u7406\u3001\u914d\u7f6e\u4e0e\u6027\u80fd\u4f18\u5316<\/h2>\n

\u5ef6\u8fdf\u52a0\u8f7d（Lazy Loading）\u662f\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f，\u7528\u4e8e\u5728\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u63a8\u8fdf\u5bf9\u8c61\u7684\u521b\u5efa\u548c\u6570\u636e\u7684\u52a0\u8f7d，\u76f4\u5230\u9700\u8981\u4f7f\u7528\u5b83\u4eec\u65f6\u624d\u8fdb\u884c\u52a0\u8f7d\u3002\u5728MyBatis\u4e2d，\u5ef6\u8fdf\u52a0\u8f7d\u673a\u5236\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6027\u80fd，\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u52a0\u8f7d，\u5c24\u5176\u9002\u7528\u4e8e\u6d89\u53ca\u590d\u6742\u6570\u636e\u5173\u7cfb\u7684\u573a\u666f\u3002<\/p>\n

1. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n

\u5ef6\u8fdf\u52a0\u8f7d\u7684\u6838\u5fc3\u601d\u60f3\u662f：\u5728\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\u65f6，\u624d\u89e6\u53d1\u5b9e\u9645\u7684\u6570\u636e\u52a0\u8f7d\u64cd\u4f5c，\u800c\u4e0d\u662f\u5728\u5bf9\u8c61\u521b\u5efa\u65f6\u52a0\u8f7d\u6240\u6709\u6570\u636e\u3002\u8fd9\u79cd\u7b56\u7565\u5e38\u7528\u4e8e\u5904\u7406\u5173\u8054\u5173\u7cfb（\u5982\u4e00\u5bf9\u591a\u3001\u591a\u5bf9\u4e00\u7b49），\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u5e93\u67e5\u8be2，\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n

\u5728MyBatis\u4e2d，\u5ef6\u8fdf\u52a0\u8f7d\u901a\u8fc7\u4ee3\u7406\u6a21\u5f0f\u5b9e\u73b0\u3002\u5177\u4f53\u6765\u8bf4，MyBatis\u901a\u8fc7Proxy\u5bf9\u8c61\u4ee3\u7406\u67d0\u4e9b\u5bf9\u8c61，\u4f7f\u5f97\u5728\u8bbf\u95ee\u8fd9\u4e9b\u5bf9\u8c61\u65f6，\u53ef\u4ee5\u5ef6\u8fdf\u6267\u884c\u5b9e\u9645\u7684SQL\u67e5\u8be2\u3002<\/p>\n

2. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u6267\u884c\u6d41\u7a0b<\/h3>\n

\u5ef6\u8fdf\u52a0\u8f7d\u7684\u6267\u884c\u6d41\u7a0b\u5982\u4e0b：<\/p>\n

  • \u914d\u7f6e\u5ef6\u8fdf\u52a0\u8f7d：\u5728MyBatis\u914d\u7f6e\u6587\u4ef6\u4e2d\u914d\u7f6e\u5ef6\u8fdf\u52a0\u8f7d\u529f\u80fd，\u6307\u5b9a\u54ea\u4e9b\u5c5e\u6027\u9700\u8981\u8fdb\u884c\u5ef6\u8fdf\u52a0\u8f7d\u3002<\/li>\n
  • \u521b\u5efa\u4ee3\u7406\u5bf9\u8c61：\u67e5\u8be2\u5305\u542b\u5ef6\u8fdf\u52a0\u8f7d\u5c5e\u6027\u7684\u5bf9\u8c61\u65f6，MyBatis\u4f1a\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61，\u800c\u4e0d\u662f\u76f4\u63a5\u52a0\u8f7d\u6574\u4e2a\u5173\u8054\u5bf9\u8c61\u3002<\/li>\n
  • \u89e6\u53d1\u5ef6\u8fdf\u52a0\u8f7d：\u8bbf\u95ee\u4ee3\u7406\u5bf9\u8c61\u7684\u5ef6\u8fdf\u52a0\u8f7d\u5c5e\u6027\u65f6，\u4ee3\u7406\u5bf9\u8c61\u901a\u8fc7\u62e6\u622a\u65b9\u6cd5\u89e6\u53d1\u5b9e\u9645\u7684SQL\u67e5\u8be2，\u5e76\u52a0\u8f7d\u5bf9\u5e94\u7684\u6570\u636e\u3002<\/li>\n
  • \u8fd4\u56de\u7ed3\u679c：\u52a0\u8f7d\u5b8c\u6570\u636e\u540e，\u4ee3\u7406\u5bf9\u8c61\u5c06\u5b9e\u9645\u6570\u636e\u586b\u5145\u5230\u5bf9\u8c61\u4e2d，\u5e76\u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n

    \u6267\u884c\u6d41\u7a0b\u56fe\u793a<\/h4>\n

    \u67e5\u8be2\u5bf9\u8c61 -> \u4ee3\u7406\u5bf9\u8c61 -> \u8bbf\u95ee\u5c5e\u6027 -> \u89e6\u53d1SQL\u67e5\u8be2 -> \u586b\u5145\u5c5e\u6027\u503c -> \u8fd4\u56de\u5b9e\u9645\u5bf9\u8c61<\/p>\n

    3. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u914d\u7f6e<\/h3>\n

    \u5728MyBatis\u4e2d，\u5ef6\u8fdf\u52a0\u8f7d\u7684\u914d\u7f6e\u4e3b\u8981\u4f9d\u8d56\u4e8e<settings>\u548c<resultMap>\u6807\u7b7e\u7684\u914d\u7f6e\u3002\u5728mybatis-config.xml\u914d\u7f6e\u6587\u4ef6\u4e2d，\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u542f\u7528\u5ef6\u8fdf\u52a0\u8f7d：<\/p>\n

    xml\u590d\u5236<\/p>\n

    <settings>
    \n <setting name="lazyLoadingEnabled" value="true"\/> <!– \u5f00\u542f\u5ef6\u8fdf\u52a0\u8f7d –>
    \n <setting name="aggressiveLazyLoading" value="false"\/> <!– \u63a7\u5236\u662f\u5426\u7acb\u5373\u52a0\u8f7d\u5173\u8054\u5bf9\u8c61 –>
    \n<\/settings><\/p>\n

    \u914d\u7f6e\u53c2\u6570\u8bf4\u660e<\/h4>\n
      \n
    • lazyLoadingEnabled：\u542f\u7528\u6216\u7981\u7528\u5ef6\u8fdf\u52a0\u8f7d\u529f\u80fd\u3002<\/li>\n
    • aggressiveLazyLoading：\u662f\u5426\u7acb\u5373\u52a0\u8f7d\u5173\u8054\u5bf9\u8c61\u3002\u901a\u5e38\u8bbe\u7f6e\u4e3afalse，\u8868\u793a\u53ea\u5728\u9700\u8981\u65f6\u624d\u52a0\u8f7d\u3002<\/li>\n<\/ul>\n

      4. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u5b9e\u73b0\u65b9\u5f0f\u2014\u2014\u4ee3\u7406\u6a21\u5f0f<\/h3>\n

      MyBatis\u4f7f\u7528Java\u7684\u52a8\u6001\u4ee3\u7406（java.lang.reflect.Proxy）\u6765\u5b9e\u73b0\u5ef6\u8fdf\u52a0\u8f7d\u3002\u5f53\u67e5\u8be2\u7684\u5bf9\u8c61\u5305\u542b\u5ef6\u8fdf\u52a0\u8f7d\u5c5e\u6027\u65f6，MyBatis\u4f1a\u751f\u6210\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61，\u5e76\u4e14\u4ee3\u7406\u5bf9\u8c61\u5728\u8bbf\u95ee\u5ef6\u8fdf\u52a0\u8f7d\u7684\u5c5e\u6027\u65f6\u624d\u4f1a\u89e6\u53d1\u5b9e\u9645\u7684\u6570\u636e\u5e93\u67e5\u8be2\u3002<\/p>\n

      \u5173\u952e\u7ec4\u4ef6<\/h4>\n
        \n
      • \u4ee3\u7406\u5bf9\u8c61：LazyLoadProxy\u662f\u5ef6\u8fdf\u52a0\u8f7d\u7684\u4ee3\u7406\u5bf9\u8c61，\u5b83\u5b9e\u73b0\u4e86InvocationHandler\u63a5\u53e3，\u7528\u4e8e\u62e6\u622a\u65b9\u6cd5\u8c03\u7528\u3002<\/li>\n
      • \u5ef6\u8fdf\u52a0\u8f7d\u903b\u8f91：\u5f53\u8c03\u7528\u4ee3\u7406\u5bf9\u8c61\u7684get\u65b9\u6cd5\u65f6，\u5982\u679c\u5c1a\u672a\u52a0\u8f7d\u6570\u636e，\u5219\u901a\u8fc7load()\u65b9\u6cd5\u6267\u884cSQL\u67e5\u8be2\u5e76\u52a0\u8f7d\u6570\u636e\u3002<\/li>\n
      • sqlSession.selectOne()：\u6267\u884cSQL\u67e5\u8be2，\u83b7\u53d6\u5b9e\u9645\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n

        \u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f，\u53ea\u6709\u5728\u5b9e\u9645\u8bbf\u95ee\u5ef6\u8fdf\u52a0\u8f7d\u7684\u5c5e\u6027\u65f6，\u624d\u4f1a\u53d1\u8d77\u6570\u636e\u5e93\u67e5\u8be2\u3002<\/p>\n

        5. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u89e6\u53d1\u673a\u5236<\/h3>\n

        \u5ef6\u8fdf\u52a0\u8f7d\u7684\u89e6\u53d1\u673a\u5236\u662f\u901a\u8fc7\u4ee3\u7406\u5bf9\u8c61\u7684invoke()\u65b9\u6cd5\u5b9e\u73b0\u7684\u3002\u6bcf\u5f53\u8bbf\u95ee\u4ee3\u7406\u5bf9\u8c61\u7684\u67d0\u4e2a\u65b9\u6cd5\u65f6，invoke()\u65b9\u6cd5\u5c31\u4f1a\u88ab\u8c03\u7528\u3002\u5728invoke()\u65b9\u6cd5\u4e2d，MyBatis\u4f1a\u5224\u65ad\u662f\u5426\u9700\u8981\u8fdb\u884c\u6570\u636e\u52a0\u8f7d（\u5373loaded\u6807\u5fd7）\u3002\u5982\u679c\u9700\u8981\u52a0\u8f7d\u6570\u636e，\u5219\u4f1a\u6267\u884cSQL\u67e5\u8be2，\u5e76\u5c06\u7ed3\u679c\u586b\u5145\u5230\u76ee\u6807\u5bf9\u8c61\u4e2d\u3002<\/p>\n

        \u5173\u952e\u903b\u8f91<\/h4>\n
          \n
        • \u5224\u65ad\u662f\u5426\u52a0\u8f7d：\u901a\u8fc7\u68c0\u67e5loaded\u6807\u5fd7\u6765\u5224\u65ad\u6570\u636e\u662f\u5426\u5df2\u7ecf\u52a0\u8f7d\u3002<\/li>\n
        • \u89e6\u53d1\u52a0\u8f7d：\u901a\u8fc7load()\u65b9\u6cd5\u53d1\u8d77SQL\u67e5\u8be2，\u5e76\u52a0\u8f7d\u6570\u636e\u3002<\/li>\n<\/ul>\n

          \u8fd9\u79cd\u65b9\u5f0f\u786e\u4fdd\u4e86\u53ea\u6709\u5728\u5b9e\u9645\u8bbf\u95ee\u65f6，\u5ef6\u8fdf\u52a0\u8f7d\u624d\u4f1a\u89e6\u53d1，\u800c\u4e0d\u4f1a\u6d6a\u8d39\u8d44\u6e90\u8fdb\u884c\u63d0\u524d\u52a0\u8f7d\u3002<\/p>\n

          6. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u6027\u80fd\u4f18\u5316<\/h3>\n

          \u867d\u7136\u5ef6\u8fdf\u52a0\u8f7d\u80fd\u591f\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u5e93\u67e5\u8be2，\u4f46\u4e5f\u53ef\u80fd\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u6311\u6218\u3002\u7279\u522b\u662f\u5728\u8bbf\u95ee\u591a\u4e2a\u5ef6\u8fdf\u52a0\u8f7d\u5c5e\u6027\u65f6，\u53ef\u80fd\u4f1a\u53d1\u8d77\u591a\u6b21\u6570\u636e\u5e93\u67e5\u8be2，\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u4f18\u5316\u5ef6\u8fdf\u52a0\u8f7d\u7684\u6027\u80fd，MyBatis\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u7b56\u7565：<\/p>\n

        • \u6279\u91cf\u67e5\u8be2：\u901a\u8fc7\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709\u5173\u8054\u5c5e\u6027，\u51cf\u5c11\u6570\u636e\u5e93\u67e5\u8be2\u6b21\u6570\u3002<\/li>\n
        • \u9884\u52a0\u8f7d：\u5728\u67e5\u8be2\u65f6，\u901a\u8fc7<resultMap>\u914d\u7f6e\u63d0\u524d\u52a0\u8f7d\u5173\u8054\u6570\u636e，\u907f\u514d\u540e\u7eed\u8bbf\u95ee\u65f6\u89e6\u53d1\u5ef6\u8fdf\u52a0\u8f7d\u3002<\/li>\n
        • \u4f7f\u7528JOIN：\u5bf9\u4e8e\u590d\u6742\u7684\u5173\u8054\u5173\u7cfb，\u4f7f\u7528SQL\u4e2d\u7684JOIN\u8bed\u53e5\u5c06\u5173\u8054\u7684\u6570\u636e\u4e00\u6b21\u6027\u52a0\u8f7d\u3002<\/li>\n

          \u901a\u8fc7\u8fd9\u4e9b\u65b9\u5f0f，\u53ef\u4ee5\u51cf\u5c11\u5ef6\u8fdf\u52a0\u8f7d\u5e26\u6765\u7684\u591a\u6b21SQL\u67e5\u8be2，\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n

          7. \u5ef6\u8fdf\u52a0\u8f7d\u7684\u5c40\u9650\u6027<\/h3>\n

          \u5c3d\u7ba1\u5ef6\u8fdf\u52a0\u8f7d\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd，\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u5c40\u9650\u6027，\u4e3b\u8981\u5305\u62ec：<\/p>\n

        • N+1\u67e5\u8be2\u95ee\u9898：\u5982\u679c\u5ef6\u8fdf\u52a0\u8f7d\u7684\u5c5e\u6027\u5b58\u5728\u591a\u4e2a\u5bf9\u8c61，\u6bcf\u6b21\u8bbf\u95ee\u65f6\u90fd\u4f1a\u89e6\u53d1\u6570\u636e\u5e93\u67e5\u8be2，\u4ece\u800c\u4ea7\u751fN+1\u6b21\u67e5\u8be2，\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/li>\n
        • \u590d\u6742\u6027\u589e\u52a0：\u5ef6\u8fdf\u52a0\u8f7d\u4f7f\u5f97\u4ee3\u7801\u7684\u590d\u6742\u6027\u589e\u52a0，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8c03\u8bd5\u548c\u7ef4\u62a4\u53d8\u5f97\u66f4\u52a0\u56f0\u96be\u3002<\/li>\n
        • \u4e8b\u52a1\u7ba1\u7406\u95ee\u9898：\u5ef6\u8fdf\u52a0\u8f7d\u7684\u67e5\u8be2\u901a\u5e38\u53d1\u751f\u5728\u4e8b\u52a1\u5916，\u53ef\u80fd\u5bfc\u81f4\u4e8b\u52a1\u7ba1\u7406\u4e0a\u7684\u95ee\u9898\u3002<\/li>\n

          \u56e0\u6b64，\u5728\u4f7f\u7528\u5ef6\u8fdf\u52a0\u8f7d\u65f6，\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u4e1a\u52a1\u9700\u6c42，\u6743\u8861\u662f\u5426\u4f7f\u7528\u8be5\u529f\u80fd，\u5e76\u7ed3\u5408\u6027\u80fd\u4f18\u5316\u624b\u6bb5\u8fdb\u884c\u5408\u7406\u914d\u7f6e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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