{"id":29502,"date":"2025-04-20T10:16:04","date_gmt":"2025-04-20T02:16:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/29502.html"},"modified":"2025-04-20T10:16:04","modified_gmt":"2025-04-20T02:16:04","slug":"%e3%80%90%e6%9c%8d%e5%8a%a1%e5%99%a8%e3%80%91mybatis%e6%98%af%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%b9%b6%e8%bf%9b%e8%a1%8c%e5%88%86%e9%a1%b5%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/29502.html","title":{"rendered":"\u3010\u670d\u52a1\u5668\u3011MyBatis\u662f\u5982\u4f55\u5728java\u4e2d\u4f7f\u7528\u5e76\u8fdb\u884c\u5206\u9875\u7684\uff1f"},"content":{"rendered":"

MyBatis \u662f\u4e00\u4e2a\u652f\u6301\u666e\u901a SQL \u67e5\u8be2\u3001\u5b58\u50a8\u8fc7\u7a0b\u548c\u9ad8\u7ea7\u6620\u5c04\u7684\u6301\u4e45\u5c42\u6846\u67b6\u3002\u5b83\u6d88\u9664\u4e86\u51e0\u4e4e\u6240\u6709\u7684 JDBC \u4ee3\u7801\u548c\u53c2\u6570\u7684\u624b\u52a8\u8bbe\u7f6e\u4ee5\u53ca\u7ed3\u679c\u96c6\u7684\u68c0\u7d22\u3002MyBatis \u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684 XML \u6216\u6ce8\u89e3\u6765\u914d\u7f6e\u548c\u6620\u5c04\u539f\u59cb\u7c7b\u578b\u3001\u63a5\u53e3\u548c Java \u7684 POJO（Plain Old Java Objects，\u666e\u901a\u8001\u5f0f Java \u5bf9\u8c61）\u5230\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\u3002<\/p>\n

MyBatis\u7684\u7279\u70b9<\/h4>\n
  • \n

    SQL \u5206\u79bb：MyBatis \u5c06 SQL \u8bed\u53e5\u4ece Java \u4ee3\u7801\u4e2d\u5206\u79bb\u51fa\u6765，\u901a\u5e38\u653e\u5728 XML \u6587\u4ef6\u4e2d，\u4f7f\u5f97 SQL \u66f4\u52a0\u6e05\u6670，\u5e76\u4e14\u4fbf\u4e8e\u7ef4\u62a4\u3002<\/p>\n<\/li>\n

  • \n

    \u7075\u6d3b\u7684\u6620\u5c04：\u63d0\u4f9b\u5f3a\u5927\u7684\u6620\u5c04\u529f\u80fd，\u80fd\u591f\u5c06 SQL \u67e5\u8be2\u7684\u7ed3\u679c\u76f4\u63a5\u6620\u5c04\u5230 Java \u5bf9\u8c61（POJOs），\u5305\u62ec\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u7b49\u590d\u6742\u5173\u7cfb\u6620\u5c04\u3002<\/p>\n<\/li>\n

  • \n

    \u52a8\u6001 SQL：\u652f\u6301\u57fa\u4e8e OGNL \u8868\u8fbe\u5f0f\u7684\u52a8\u6001 SQL \u6784\u5efa，\u5141\u8bb8\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u751f\u6210\u4e0d\u540c\u7684 SQL \u8bed\u53e5\u3002<\/p>\n<\/li>\n

  • \n

    \u63d2\u4ef6\u673a\u5236：\u901a\u8fc7\u63d2\u4ef6\u673a\u5236\u53ef\u4ee5\u5bf9 SQL \u6267\u884c\u8fc7\u7a0b\u8fdb\u884c\u62e6\u622a\u548c\u589e\u5f3a，\u6bd4\u5982\u5b9e\u73b0\u5206\u9875\u3001\u7f13\u5b58\u7b49\u529f\u80fd\u3002<\/p>\n<\/li>\n

  • \n

    \u4e0e Spring \u96c6\u6210：\u6613\u4e8e\u4e0e Spring \u7b49\u4e3b\u6d41\u6846\u67b6\u96c6\u6210，\u63d0\u4f9b\u4e8b\u52a1\u7ba1\u7406\u548c\u4f9d\u8d56\u6ce8\u5165\u7684\u652f\u6301\u3002<\/p>\n<\/li>\n

  • \n

    \u6570\u636e\u5e93\u72ec\u7acb\u6027：\u5c3d\u7ba1 MyBatis \u4e0d\u50cf Hibernate \u90a3\u6837\u63d0\u4f9b\u5b8c\u5168\u7684 ORM \u89e3\u51b3\u65b9\u6848，\u4f46\u5b83\u4ecd\u7136\u53ef\u4ee5\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u5e93\u4e4b\u95f4\u4fdd\u6301\u8f83\u9ad8\u7684\u79fb\u690d\u6027，\u53ea\u9700\u8981\u8c03\u6574\u76f8\u5e94\u7684 SQL \u8bed\u53e5\u6216\u4f7f\u7528\u63d2\u4ef6\u5982 PageHelper \u6765\u9002\u914d\u7279\u5b9a\u6570\u636e\u5e93\u7684\u65b9\u8a00\u3002<\/p>\n<\/li>\n

  • \n

    \u6027\u80fd\u4f18\u5316：\u7531\u4e8e\u5b83\u662f\u534a\u81ea\u52a8\u5316\u7684\u6301\u4e45\u5c42\u6846\u67b6，\u5f00\u53d1\u8005\u53ef\u4ee5\u6839\u636e\u9700\u8981\u624b\u52a8\u7f16\u5199\u9ad8\u6548\u7684 SQL，\u4ece\u800c\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\u3002<\/p>\n<\/li>\n

    \u5728 Java \u4e2d\u4f7f\u7528 MyBatis \u8fdb\u884c\u5206\u9875<\/h4>\n

    \u5728 Java \u4e2d\u4f7f\u7528 MyBatis \u8fdb\u884c\u5206\u9875\u67e5\u8be2，\u901a\u5e38\u4f1a\u7ed3\u5408\u6570\u636e\u5e93\u7684\u5206\u9875\u529f\u80fd\u6216\u4f7f\u7528\u7b2c\u4e09\u65b9\u63d2\u4ef6\u5982 PageHelper \u6765\u7b80\u5316\u5206\u9875\u903b\u8f91\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 PageHelper \u63d2\u4ef6\u8fdb\u884c\u5206\u9875\u7684\u57fa\u672c\u6b65\u9aa4：<\/p>\n

  • \n

    \u5f15\u5165\u4f9d\u8d56： \u9996\u5148，\u5728\u9879\u76ee\u7684 pom.xml \u6587\u4ef6\u4e2d\u6dfb\u52a0 PageHelper \u548c MyBatis \u7684\u4f9d\u8d56\u3002<\/p>\n<\/li>\n

  • \n

    \u914d\u7f6e PageHelper： \u5728 MyBatis \u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\u914d\u7f6e PageHelper \u63d2\u4ef6，\u4f8b\u5982\u5728 mybatis-config.xml \u4e2d\u6dfb\u52a0\u5982\u4e0b\u914d\u7f6e：<\/p>\n

    <<\/span>plugins<\/span>><\/span><\/span>
    \n <<\/span>plugin<\/span> interceptor<\/span>=<\/span>"<\/span>com.github.pagehelper.PageInterceptor"<\/span><\/span>><\/span><\/span>
    \n <!– \u914d\u7f6e\u53c2\u6570 –><\/span>
    \n <\/<\/span>plugin<\/span>><\/span><\/span>
    \n<\/<\/span>plugins<\/span>><\/span><\/span>\n <\/li>\n

  • \n

    \u7f16\u5199 Mapper \u63a5\u53e3： \u521b\u5efa\u5bf9\u5e94\u7684 Mapper \u63a5\u53e3，\u5e76\u5b9a\u4e49\u9700\u8981\u6267\u884c\u7684\u67e5\u8be2\u65b9\u6cd5\u3002\u4f8b\u5982：<\/p>\n

    public<\/span> interface<\/span> UserMapper<\/span> {<\/span>
    \n List<\/span><<\/span>User<\/span>><\/span><\/span> selectUsers<\/span>(<\/span>)<\/span>;<\/span>
    \n}<\/span>\n <\/li>\n

  • \n

    \u4f7f\u7528 PageHelper \u8fdb\u884c\u5206\u9875： \u5728\u8c03\u7528\u67e5\u8be2\u65b9\u6cd5\u4e4b\u524d，\u4f7f\u7528 PageHelper \u63d0\u4f9b\u7684\u65b9\u6cd5\u5f00\u59cb\u5206\u9875，\u6bd4\u5982 PageHelper.startPage(pageNum, pageSize)，\u5176\u4e2d pageNum \u662f\u9875\u7801，pageSize \u662f\u6bcf\u9875\u663e\u793a\u7684\u6570\u91cf\u3002<\/p>\n

    import<\/span> com.<\/span>github.<\/span>pagehelper.<\/span><\/span>PageHelper<\/span><\/span>;<\/span>
    \nimport<\/span> com.<\/span>github.<\/span>pagehelper.<\/span><\/span>PageInfo<\/span><\/span>;<\/span><\/p>\n

    \/\/ \u8bbe\u7f6e\u5206\u9875\u53c2\u6570<\/span>
    \nPageHelper<\/span>.<\/span>startPage<\/span>(<\/span>pageNum,<\/span> pageSize)<\/span>;<\/span>
    \n\/\/ \u6267\u884c\u67e5\u8be2<\/span>
    \nList<\/span><<\/span>User<\/span>><\/span><\/span> userList =<\/span> userMapper.<\/span>selectUsers<\/span>(<\/span>)<\/span>;<\/span>
    \n\/\/ \u83b7\u53d6\u5206\u9875\u4fe1\u606f<\/span>
    \nPageInfo<\/span><<\/span>User<\/span>><\/span><\/span> pageInfo =<\/span> new<\/span> PageInfo<\/span><<\/span>><\/span><\/span>(<\/span>userList)<\/span>;<\/span>\n <\/li>\n

  • \n

    \u5904\u7406\u5206\u9875\u7ed3\u679c： \u4f7f\u7528 PageInfo \u7c7b\u6765\u83b7\u53d6\u5206\u9875\u540e\u7684\u6570\u636e，\u5305\u62ec\u603b\u8bb0\u5f55\u6570\u3001\u603b\u9875\u6570\u3001\u5f53\u524d\u9875\u7684\u6570\u636e\u5217\u8868\u7b49\u4fe1\u606f\u3002<\/p>\n<\/li>\n

    PageHelper\u63d2\u4ef6\u914d\u7f6e<\/h4>\n

    PageHelper \u63d2\u4ef6\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u914d\u7f6e\u9009\u9879\u6765\u6ee1\u8db3\u4e0d\u540c\u7684\u5206\u9875\u9700\u6c42\u3002\u8fd9\u4e9b\u914d\u7f6e\u9879\u53ef\u4ee5\u5728 MyBatis \u7684\u5168\u5c40\u914d\u7f6e\u6587\u4ef6（\u5982 mybatis-config.xml）\u4e2d\u5b9a\u4e49，\u6216\u8005\u5728\u542f\u52a8 PageHelper \u65f6\u901a\u8fc7\u4ee3\u7801\u65b9\u5f0f\u8bbe\u7f6e\u3002\u4ee5\u4e0b\u662f PageHelper \u7684\u4e00\u4e9b\u4e3b\u8981\u914d\u7f6e\u53c2\u6570：<\/p>\n

  • \n

    helperDialect：<\/p>\n

      \n
    • \u6570\u636e\u5e93\u65b9\u8a00，\u7528\u4e8e\u544a\u8bc9\u63d2\u4ef6\u4f7f\u7528\u54ea\u79cd\u6570\u636e\u5e93\u7684\u5206\u9875\u8bed\u6cd5\u3002\u4f8b\u5982：mysql, oracle, sqlserver \u7b49\u3002\u5982\u679c\u672a\u6307\u5b9a，\u63d2\u4ef6\u4f1a\u81ea\u52a8\u68c0\u6d4b\u5f53\u524d\u6570\u636e\u5e93\u7684\u65b9\u8a00，\u4f46\u63a8\u8350\u663e\u5f0f\u6307\u5b9a\u4ee5\u907f\u514d\u6f5c\u5728\u95ee\u9898\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n

      reasonable：<\/p>\n

        \n
      • \u5206\u9875\u5408\u7406\u5316，\u9ed8\u8ba4\u503c\u4e3a false\u3002\u5f00\u542f\u540e，\u5f53 pageNum <= 0 \u65f6\u4f1a\u81ea\u52a8\u8c03\u6574\u4e3a\u7b2c\u4e00\u9875；\u5f53 pageNum > pages (\u603b\u9875\u6570)\u65f6\u4f1a\u81ea\u52a8\u8c03\u6574\u4e3a\u6700\u540e\u4e00\u9875\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n

        supportMethodsArguments：<\/p>\n

          \n
        • \u662f\u5426\u652f\u6301\u901a\u8fc7\u65b9\u6cd5\u53c2\u6570\u6765\u4f20\u9012\u5206\u9875\u53c2\u6570，\u9ed8\u8ba4\u503c\u4e3a false\u3002\u5f00\u542f\u540e\u53ef\u4ee5\u4e0d\u4f7f\u7528 PageHelper.startPage \u65b9\u6cd5，\u800c\u662f\u76f4\u63a5\u5728 Mapper \u63a5\u53e3\u7684\u65b9\u6cd5\u4e2d\u6dfb\u52a0\u5206\u9875\u53c2\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \n

          params：<\/p>\n

            \n
          • \u81ea\u5b9a\u4e49\u53c2\u6570，\u53ef\u4ee5\u901a\u8fc7\u6b64\u5c5e\u6027\u6765\u8986\u76d6\u9ed8\u8ba4\u7684\u5206\u9875\u53c2\u6570\u540d\u79f0\u3002\u4f8b\u5982：count=countSql;pagehelper=pageHelper，\u8fd9\u91cc\u6307\u5b9a\u4e86\u8ba1\u6570\u67e5\u8be2\u8bed\u53e5\u4e2d\u7684 count \u53c2\u6570\u548c\u5206\u9875\u52a9\u624b\u7684\u522b\u540d\u3002<\/li>\n<\/ul>\n<\/li>\n
          • \n

            autoRuntimeDialect：<\/p>\n

              \n
            • \u662f\u5426\u81ea\u52a8\u8bc6\u522b\u6570\u636e\u5e93\u65b9\u8a00，\u9ed8\u8ba4\u503c\u4e3a false\u3002\u5982\u679c\u5f00\u542f\u4e86\u8fd9\u4e2a\u9009\u9879，\u5219\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a helperDialect，\u63d2\u4ef6\u4f1a\u6839\u636e\u8fd0\u884c\u65f6\u7684\u6570\u636e\u5e93\u8fde\u63a5\u4fe1\u606f\u81ea\u52a8\u9009\u62e9\u5408\u9002\u7684\u65b9\u8a00\u3002<\/li>\n<\/ul>\n<\/li>\n
            • \n

              closeConn：<\/p>\n

                \n
              • \u6267\u884c\u5206\u9875\u540e\u662f\u5426\u5173\u95ed\u8fde\u63a5，\u9ed8\u8ba4\u503c\u4e3a true\u3002\u5bf9\u4e8e\u67d0\u4e9b\u7279\u6b8a\u573a\u666f，\u6bd4\u5982\u6267\u884c\u5b58\u50a8\u8fc7\u7a0b\u65f6，\u53ef\u80fd\u9700\u8981\u5c06\u6b64\u9009\u9879\u8bbe\u4e3a false\u3002<\/li>\n<\/ul>\n<\/li>\n
              • \n

                offsetAsPageNum：<\/p>\n

                  \n
                • \u662f\u5426\u628a offset \u5f53\u4f5c\u9875\u7801\u6765\u4f7f\u7528，\u9ed8\u8ba4\u503c\u4e3a false\u3002\u5982\u679c\u8bbe\u4e3a true，\u5219\u5206\u9875\u63d2\u4ef6\u4f1a\u81ea\u52a8\u8ba1\u7b97\u51fa\u6b63\u786e\u7684 offset \u548c limit\u3002<\/li>\n<\/ul>\n<\/li>\n
                • \n

                  rowBoundsWithCount：<\/p>\n

                    \n
                  • \u662f\u5426\u8fdb\u884c\u8bb0\u5f55\u603b\u6570\u67e5\u8be2，\u9ed8\u8ba4\u503c\u4e3a false\u3002\u5f00\u542f\u540e\u6bcf\u6b21\u5206\u9875\u90fd\u4f1a\u81ea\u52a8\u67e5\u8be2\u4e00\u6b21\u603b\u6570，\u9002\u7528\u4e8e\u9700\u8981\u663e\u793a\u603b\u9875\u6570\u6216\u603b\u8bb0\u5f55\u6570\u7684\u573a\u5408\u3002<\/li>\n<\/ul>\n<\/li>\n
                  • \n

                    pageSizeZero：<\/p>\n

                      \n
                    • \u5f53 pageSize = 0 \u6216 pageSize < 0 \u65f6，\u662f\u5426\u8fd4\u56de\u5168\u90e8\u7ed3\u679c，\u9ed8\u8ba4\u503c\u4e3a false\u3002<\/li>\n<\/ul>\n<\/li>\n
                    • \n

                      reasonableAdjust：<\/p>\n

                        \n
                      • \u662f\u5426\u542f\u7528\u5408\u7406\u7684\u8c03\u6574，\u9ed8\u8ba4\u503c\u4e3a true\u3002\u5b83\u4f1a\u5f71\u54cd reasonable \u5c5e\u6027\u7684\u884c\u4e3a，\u5373\u5f53 pageNum <= 0 \u6216 pageNum > pages \u65f6\u5982\u4f55\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n

                        \u8fd9\u4e9b\u914d\u7f6e\u9879\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u66f4\u597d\u5730\u63a7\u5236\u5206\u9875\u884c\u4e3a，\u786e\u4fdd\u5206\u9875\u903b\u8f91\u7b26\u5408\u5177\u4f53\u7684\u5e94\u7528\u9700\u6c42\u3002\u901a\u5e38\u60c5\u51b5\u4e0b，\u9ed8\u8ba4\u914d\u7f6e\u5df2\u7ecf\u80fd\u591f\u6ee1\u8db3\u5927\u90e8\u5206\u5e94\u7528\u7684\u9700\u6c42，\u4f46\u5728\u7279\u5b9a\u573a\u666f\u4e0b\u9002\u5f53\u7684\u914d\u7f6e\u8c03\u6574\u662f\u5fc5\u8981\u7684\u3002 \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                        \u6ce8\u610f\u4e8b\u9879<\/h4>\n
                          \n
                        • PageHelper \u9ed8\u8ba4\u9002\u7528\u4e8e MySQL \u6570\u636e\u5e93\u3002\u5982\u679c\u4f7f\u7528\u5176\u4ed6\u7c7b\u578b\u7684\u6570\u636e\u5e93，\u53ef\u80fd\u9700\u8981\u6839\u636e\u5177\u4f53\u6570\u636e\u5e93\u8c03\u6574\u5206\u9875\u63d2\u4ef6\u7684\u914d\u7f6e\u3002<\/li>\n
                        • \u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4f7f\u7528 PageHelper \u65f6\u8981\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168，\u56e0\u4e3a\u5206\u9875\u53c2\u6570\u662f\u57fa\u4e8e ThreadLocal \u5b58\u50a8\u7684\u3002<\/li>\n
                        • \u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u5df2\u7ecf\u5b58\u5728\u4e8b\u52a1\u7ba1\u7406，\u5219\u9700\u8981\u6ce8\u610f PageHelper \u5206\u9875\u64cd\u4f5c\u4e0e\u4e8b\u52a1\u4e4b\u95f4\u7684\u4ea4\u4e92，\u786e\u4fdd\u4e0d\u4f1a\u4ea7\u751f\u610f\u5916\u7684\u884c\u4e3a\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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