{"id":69103,"date":"2026-01-31T05:05:06","date_gmt":"2026-01-30T21:05:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/69103.html"},"modified":"2026-01-31T05:05:06","modified_gmt":"2026-01-30T21:05:06","slug":"day-8-mybatis","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/69103.html","title":{"rendered":"day-8 MyBatis"},"content":{"rendered":"

MyBatis<\/h2>\n

\u4e00\u3001\u81ea\u589e ID \u63d2\u5165\u89c4\u5219<\/h3>\n
  • \u6570\u636e\u5e93\u5b57\u6bb5\u8bbe\u4e3a\u81ea\u589e（\u5982 MySQL AUTO_INCREMENT），INSERT \u8bed\u53e5\u7701\u7565\u81ea\u589e\u5b57\u6bb5，\u6570\u636e\u5e93\u81ea\u52a8\u751f\u6210 ID；<\/li>\n
  • \u5b9e\u4f53\u7c7b\u4e2d\u81ea\u589e\u5b57\u6bb5\u65e0\u9700\u8d4b\u503c（\u9ed8\u8ba4 null \u5373\u53ef），MyBatis \u53ef\u901a\u8fc7@Options(useGeneratedKeys = true, keyProperty = "id")\u5c06\u751f\u6210\u7684 ID \u56de\u663e\u5230\u5b9e\u4f53；<\/li>\n
  • \u7981\u6b62\u4f20 0\/-1 \u7b49\u975e null \u65e0\u6548\u503c，\u4f1a\u76f4\u63a5\u63d2\u5165\u8be5\u503c\u5bfc\u81f4\u4e3b\u952e\u6df7\u4e71\u3002<\/li>\n

    \u4e8c\u3001SQL \u5360\u4f4d\u7b26\u6838\u5fc3\u89c4\u8303<\/h3>\n

    1. \u4f18\u5148\u4f7f\u7528#{}（\u9884\u7f16\u8bd1\u5360\u4f4d\u7b26）<\/h4>\n
      \n
    • \u5929\u7136\u9632\u6b62 SQL \u6ce8\u5165，\u81ea\u52a8\u505a\u7c7b\u578b\u8f6c\u6362\u3001\u52a0\u5f15\u53f7，\u662f\u5f00\u53d1\u9ed8\u8ba4\u9009\u62e9；<\/li>\n
    • \u7edd\u5bf9\u7981\u6b62 Java \u4ee3\u7801\u4e2d\u7528+\u53f7\u62fc\u63a5 SQL \u53c2\u6570，\u5b58\u5728\u4e25\u91cd\u6ce8\u5165\u98ce\u9669\u3002<\/li>\n<\/ul>\n

      2. \u7279\u6b8a\u573a\u666f\u4f7f\u7528${}（\u5b57\u7b26\u4e32\u62fc\u63a5）<\/h4>\n
        \n
      • \u4ec5\u7528\u4e8eSQL \u6807\u8bc6\u7b26 \/ \u5173\u952e\u5b57\u52a8\u6001\u66ff\u6362（\u8868\u540d\u3001\u5217\u540d\u3001\u6392\u5e8f\u5b57\u6bb5 \/ \u65b9\u5f0f），\u5982order by ${sortField} ${sortType}；<\/li>\n
      • \u5fc5\u987b\u505a\u767d\u540d\u5355\u6821\u9a8c（\u4ec5\u5141\u8bb8\u5408\u6cd5\u503c\u4f20\u5165），\u7981\u6b62\u76f4\u63a5\u63a5\u6536\u524d\u7aef\u539f\u59cb\u8f93\u5165，\u907f\u514d\u6ce8\u5165\u3002<\/li>\n<\/ul>\n

        3. AS \u522b\u540d\u4f7f\u7528\u539f\u5219<\/h4>\n
          \n
        • \u666e\u901a\u5355\u8868 CRUD\u65e0\u9700\u4f7f\u7528，\u67e5\u539f\u751f\u5b57\u6bb5，\u540e\u7aef \/ \u524d\u7aef\u505a\u5b57\u6bb5\u9002\u914d，\u7b26\u5408\u5206\u5c42\u8bbe\u8ba1；<\/li>\n
        • \u5fc5\u987b\u4f7f\u7528\u573a\u666f：\u805a\u5408\u67e5\u8be2（count(*) as total）\u3001\u8054\u8868\u67e5\u8be2（\u89e3\u51b3\u5b57\u6bb5\u91cd\u540d）\u3001\u590d\u6742\u5b50\u67e5\u8be2（\u5916\u5c42\u9700\u5f15\u7528\u5185\u5c42\u7ed3\u679c）\u3002<\/li>\n<\/ul>\n

          \u4e09\u3001MyBatis \u6838\u5fc3\u4f20\u53c2\u89c4\u5219（\u65e0 @Param）<\/h3>\n

          1. \u4f20\u5355\u4e2a\u5b9e\u4f53\u7c7b\u5bf9\u8c61（\u6700\u5e38\u7528）<\/h4>\n
            \n
          • #{\u5360\u4f4d\u7b26\u540d} \u5fc5\u987b\u4e0e\u5b9e\u4f53\u7c7b\u5c5e\u6027\u540d\u4e25\u683c\u4e00\u81f4（MyBatis \u901a\u8fc7 getter\/setter \u53d6\u503c，\u533a\u5206\u5927\u5c0f\u5199）；<\/li>\n
          • \u4e0e Mapper \u65b9\u6cd5\u5165\u53c2\u53d8\u91cf\u540d\u65e0\u5173（\u5982int add(User u)，\u5165\u53c2\u540d u \u4e0d\u5f71\u54cd\u5339\u914d）；<\/li>\n
          • \u7f16\u8bd1\u671f\u65e0\u8bed\u6cd5\u9519\u8bef，\u5c5e\u6027\u540d\u4e0d\u5339\u914d\u65f6\u8fd0\u884c\u65f6\u62a5\u9519（\u63d0\u793a\u627e\u4e0d\u5230\u5bf9\u5e94\u7684getter\u65b9\u6cd5）\u3002<\/li>\n<\/ul>\n

            2. \u4f20\u5355\u4e2a\u57fa\u672c\u7c7b\u578b \/ \u5b57\u7b26\u4e32<\/h4>\n
              \n
            • #{\u5360\u4f4d\u7b26\u540d} \u53ef\u4efb\u610f\u5199（MyBatis \u5bf9\u5355\u4e2a\u57fa\u672c\u53c2\u6570\u65e0\u547d\u540d\u8981\u6c42），\u5efa\u8bae\u4e0e\u5f62\u53c2\u540d\u4e00\u81f4\u589e\u5f3a\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n

              3. \u4f20 Map \u5bf9\u8c61<\/h4>\n
                \n
              • #{\u5360\u4f4d\u7b26\u540d} \u5fc5\u987b\u4e0e Map \u7684key \u503c\u4e25\u683c\u4e00\u81f4\u3002<\/li>\n<\/ul>\n

                4. \u591a\u53c2\u6570\u4f20\u53c2<\/h4>\n
                  \n
                • \u65e0 @Param \u65f6\u76f4\u63a5\u8fd0\u884c\u62a5\u9519（\u63d0\u793aParameter 'xxx' not found），\u591a\u53c2\u6570\u5fc5\u987b\u52a0 @Param \u6ce8\u89e3\u3002<\/li>\n<\/ul>\n

                  \u56db\u3001@Param \u6ce8\u89e3\u6838\u5fc3\u4f7f\u7528<\/h3>\n

                  1. \u6838\u5fc3\u4f5c\u7528<\/h4>\n

                  \u7ed9 Mapper \u65b9\u6cd5\u7684\u53c2\u6570\u6307\u5b9a\u552f\u4e00\u522b\u540d，\u8ba9 MyBatis \u7ed1\u5b9a#{\u5360\u4f4d\u7b26\u540d}，\u7a81\u7834\u539f\u751f\u5f62\u53c2\u540d\u9650\u5236，\u662f\u591a\u53c2\u6570\u4f20\u53c2\u7684\u6807\u914d\u3002<\/p>\n

                  2. \u57fa\u7840\u4f7f\u7528\u573a\u666f<\/h4>\n

                  （1）\u591a\u57fa\u672c\u7c7b\u578b\u53c2\u6570<\/h5>\n

                  \/\/ @Param\u522b\u540d\u4e0e#{\u5360\u4f4d\u7b26\u540d}\u4e00\u81f4，\u4e0e\u539f\u5f62\u53c2\u540d\u65e0\u5173
                  \n@Delete("DELETE FROM t_user WHERE id = #{t_id}")
                  \nint deleteUserById(@Param("t_id") Integer id);<\/p>\n

                  （2）\u5b9e\u4f53\u7c7b + \u57fa\u672c\u7c7b\u578b\u6df7\u5408\u4f20\u53c2<\/h5>\n

                  \/\/ \u5b9e\u4f53\u7c7b\u52a0@Param\u540e，\u5360\u4f4d\u7b26\u9700\u5199\u300c\u522b\u540d.\u5b9e\u4f53\u5c5e\u6027\u540d\u300d
                  \n@Insert("INSERT INTO t_user(username, create_time) VALUES (#{user.username}, #{createTime})")
                  \nint addUser(@Param("user") User user, @Param("createTime") LocalDateTime createTime);<\/p>\n

                  3. \u5173\u952e\u7279\u6027<\/h4>\n
                    \n
                  • \u52a0 @Param \u540e，#{\u5360\u4f4d\u7b26\u540d} \u4ec5\u4e0e @Param \u7684 value \u503c\u4e00\u81f4，\u4e0e\u539f\u5f62\u53c2\u540d\u5b8c\u5168\u65e0\u5173；<\/li>\n
                  • \u5355\u4e2a\u53c2\u6570\u4e5f\u53ef\u52a0 @Param（\u4e07\u80fd\u5199\u6cd5，\u65e0\u517c\u5bb9\u95ee\u9898），\u63a8\u8350\u56e2\u961f\u5f00\u53d1\u7edf\u4e00\u4f7f\u7528\u3002<\/li>\n<\/ul>\n

                    4. \u5b57\u8282\u7801\u5c42\u9762\u539f\u7406<\/h4>\n
                      \n
                    • @Param\u4e0d\u4f1a\u4fee\u6539\u5b57\u8282\u7801\u4e2d\u7684\u539f\u751f\u5f62\u53c2\u540d，\u9ed8\u8ba4\u7f16\u8bd1（\u672a\u5f00-parameters）\u4e0b\u5f62\u53c2\u4f1a\u88ab\u7f16\u8bd1\u4e3aarg0\/arg1（\u800c\u975e var1\/var2）；<\/li>\n
                    • @Param \u7684\u522b\u540d\u4ee5\u8fd0\u884c\u65f6\u53ef\u89c1\u7684\u53c2\u6570\u6ce8\u89e3\u5143\u6570\u636e\u5b58\u50a8\u5728\u5b57\u8282\u7801\u4e2d，MyBatis \u8fd0\u884c\u65f6\u901a\u8fc7\u53cd\u5c04\u8bfb\u53d6\u8be5\u5143\u6570\u636e\u5b9e\u73b0\u53c2\u6570\u7ed1\u5b9a，\u7ed5\u5f00\u539f\u751f\u5f62\u53c2\u540d\u4e22\u5931\u95ee\u9898\u3002<\/li>\n<\/ul>\n

                      \u4e94\u3001\u7f16\u8bd1\u53c2\u6570-parameters\u4e0e MyBatis \u7248\u672c\u5173\u8054<\/h3>\n

                      1. \u6838\u5fc3\u5dee\u5f02（\u662f\u5426\u9700\u8981 @Param）<\/h4>\n
                        \n
                      • MyBatis 3.4.0+（JDK8+）：\u5f00-parameters\u53ef\u4fdd\u7559\u539f\u751f\u5f62\u53c2\u540d，\u5355\u57fa\u672c\u53c2\u6570\u53ef\u7701\u7565 @Param；\u591a\u53c2\u6570\u4ecd\u5fc5\u987b\u52a0；<\/li>\n
                      • MyBatis 3.4.0 \u4e4b\u524d：\u65e0\u8bba\u662f\u5426\u5f00-parameters，\u6240\u6709\u53c2\u6570（\u542b\u5355\u53c2\u6570）\u5fc5\u987b\u52a0 @Param，\u5426\u5219\u8fd0\u884c\u62a5\u9519\u3002<\/li>\n<\/ul>\n

                        2. \u6846\u67b6\u65e0\u5173\u6027<\/h4>\n

                        \u662f\u5426\u9700\u8981\u52a0 @Param\u4e0e Spring Boot \u65e0\u5173，\u4ec5\u7531 MyBatis \u7248\u672c\u548c-parameters\u7f16\u8bd1\u914d\u7f6e\u51b3\u5b9a；<\/p>\n

                          \n
                        • Spring Boot \u9ed8\u8ba4\u5f00\u542f-parameters，\u4e14\u6574\u5408\u9ad8\u7248\u672c MyBatis，\u652f\u6301\u5355\u53c2\u6570\u7701 @Param；<\/li>\n
                        • \u975e Spring Boot \u9879\u76ee\u9ed8\u8ba4\u672a\u5f00-parameters，\u539f\u751f\u5f62\u53c2\u540d\u4f1a\u4e22\u5931，\u5355\u53c2\u6570\u5efa\u8bae\u52a0 @Param \u907f\u514d\u62a5\u9519\u3002<\/li>\n<\/ul>\n

                          3. \u4f18\u5148\u7ea7<\/h4>\n

                          MyBatis \u8fd0\u884c\u65f6\u4f18\u5148\u8bfb\u53d6 @Param \u6ce8\u89e3\u7684\u522b\u540d，\u5373\u4f7f\u5f00\u542f-parameters\u4fdd\u7559\u4e86\u539f\u751f\u5f62\u53c2\u540d，\u4e5f\u4f1a\u5ffd\u7565\u539f\u751f\u540d\u3002<\/p>\n

                          \u516d\u3001\u5e38\u89c1\u8fd0\u884c\u65f6\u9519\u8bef & \u907f\u5751\u6280\u5de7<\/h3>\n

                          1. \u5178\u578b\u62a5\u9519\u7c7b\u578b<\/h4>\n
                            \n
                          • Parameter 'xxx' not found：\u591a\u53c2\u6570\u65e0 @Param\u3001@Param \u522b\u540d\u4e0e\u5360\u4f4d\u7b26\u540d\u4e0d\u5339\u914d\u3001Map key \/ \u5b9e\u4f53\u5c5e\u6027\u540d\u4e0e\u5360\u4f4d\u7b26\u540d\u4e0d\u5339\u914d；<\/li>\n
                          • \u627e\u4e0d\u5230\u5bf9\u5e94\u7684getter\u65b9\u6cd5：\u5b9e\u4f53\u5c5e\u6027\u540d\u4e0e\u5360\u4f4d\u7b26\u540d\u4e0d\u5339\u914d\u3001\u5927\u5c0f\u5199\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n

                            2. \u907f\u5751\u6280\u5de7<\/h4>\n
                          • \u5f00\u53d1\u671f\u4f7f\u7528 IDEA \u63d2\u4ef6（\u5982Free MyBatis Plugin），\u5b9e\u65f6\u6821\u9a8c\u53c2\u6570\u6620\u5c04，\u7f16\u8f91\u5668\u6807\u7ea2\u9519\u8bef，\u65e0\u9700\u7b49\u5230\u8fd0\u884c\u65f6；<\/li>\n
                          • \u5b9e\u4f53\u7c7b\u642d\u914d Lombok \u65f6，\u5fc5\u987b\u52a0@NoArgsConstructor + @Data（MyBatis \u9700\u8981\u65e0\u53c2\u6784\u9020\u521b\u5efa\u5bf9\u8c61，getter\/setter \u8d4b\u503c）；<\/li>\n
                          • \u5168\u7248\u672c \/ \u5168\u6846\u67b6\u4e07\u80fd\u517c\u5bb9\u5199\u6cd5：\u6240\u6709 Mapper \u65b9\u6cd5\u53c2\u6570\u90fd\u52a0 @Param \u6ce8\u89e3，\u6c38\u65e0\u53c2\u6570\u5339\u914d\u95ee\u9898\u3002<\/li>\n

                            7. XML \u6620\u5c04\u914d\u7f6e<\/h3>\n

                            \u4e00\u3001\u6838\u5fc3\u6982\u5ff5<\/h4>\n

                            MyBatis \u652f\u6301\u4e24\u79cd SQL \u914d\u7f6e\u65b9\u5f0f：\u6ce8\u89e3\u914d\u7f6e\u548cXML \u914d\u7f6e\u6587\u4ef6\u3002XML \u6620\u5c04\u914d\u7f6e\u662f\u66f4\u5e38\u7528\u7684\u65b9\u5f0f，\u5c24\u5176\u9002\u5408\u590d\u6742 SQL \u573a\u666f\u3002<\/p>\n

                            \u4e8c\u3001\u9ed8\u8ba4\u89c4\u5219（\u5fc5\u987b\u9075\u5b88）<\/h4>\n
                          • \n

                            \u540c\u5305\u540c\u540d<\/p>\n

                            XML \u6620\u5c04\u6587\u4ef6\u7684\u540d\u79f0\u5fc5\u987b\u4e0e Mapper \u63a5\u53e3\u540d\u79f0\u5b8c\u5168\u4e00\u81f4，\u5e76\u4e14\u8981\u653e\u5728\u540c\u4e00\u4e2a\u5305\u4e0b\u3002<\/p>\n

                            \u4f8b\u5982：<\/p>\n

                            UserMapper.java<\/p>\n

                            \u548c<\/p>\n

                            UserMapper.xml<\/p>\n

                            \u90fd\u5728<\/p>\n

                            com.mybatisdemo.mapper<\/p>\n

                            \u5305\u4e0b\u3002<\/p>\n<\/li>\n

                          • \n

                            namespace \u4e00\u81f4<\/p>\n

                            XML \u6620\u5c04\u6587\u4ef6\u4e2d\u7684<\/p>\n

                            namespace<\/p>\n

                            \u5c5e\u6027\u503c，\u5fc5\u987b\u662f\u5bf9\u5e94 Mapper \u63a5\u53e3\u7684\u5168\u9650\u5b9a\u540d\u3002<\/p>\n

                            <mapper namespace="com.mybatisdemo.mapper.UserMapper"><\/p>\n<\/li>\n

                          • \n

                            ID \u4e0e\u8fd4\u56de\u503c\u4e00\u81f4<\/p>\n

                            XML \u4e2d SQL \u8bed\u53e5\u7684<\/p>\n

                            id<\/p>\n

                            \u5fc5\u987b\u4e0e Mapper \u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u540d\u5b8c\u5168\u4e00\u81f4\u3002<\/p>\n

                            \u8fd4\u56de\u7c7b\u578b（<\/p>\n

                            resultType<\/p>\n

                            ）\u4e5f\u5fc5\u987b\u4e0e\u63a5\u53e3\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\u5339\u914d\u3002<\/p>\n

                            \/\/ Mapper\u63a5\u53e3\u65b9\u6cd5
                            \nList<User> findAll();<\/p>\n

                            <!– XML\u4e2d\u7684\u5bf9\u5e94SQL –>
                            \n<select id="findAll" resultType="com.mybatisdemo.pojo.User">
                            \n select id, username, password, name, age from user
                            \n<\/select><\/p>\n<\/li>\n

                            \u4e09\u3001\u5173\u952e\u914d\u7f6e\u8bf4\u660e<\/h4>\n
                              \n
                            • \u8fd4\u56de\u96c6\u5408\u7684\u7279\u6b8a\u5904\u7406：\u5f53\u63a5\u53e3\u65b9\u6cd5\u8fd4\u56de List<User> \u65f6，XML \u4e2d\u7684 resultType \u53ea\u9700\u5199\u5355\u4e2a\u5b9e\u4f53\u7c7b\u7684\u5168\u9650\u5b9a\u540d（\u5982 com.mybatisdemo.pojo.User），MyBatis \u4f1a\u81ea\u52a8\u5c06\u7ed3\u679c\u5c01\u88c5\u4e3a List \u96c6\u5408\u3002<\/li>\n
                            • \u522b\u540d\u4f18\u5316：\u5982\u679c\u5728 MyBatis \u5168\u5c40\u914d\u7f6e\u4e2d\u7ed9\u5b9e\u4f53\u7c7b\u914d\u7f6e\u4e86\u522b\u540d，resultType \u53ef\u4ee5\u76f4\u63a5\u5199\u522b\u540d（\u5982 User），\u7b80\u5316\u914d\u7f6e\u3002<\/li>\n<\/ul>\n

                              \u56db\u3001\u9879\u76ee\u7ed3\u6784\u793a\u4f8b<\/h4>\n

                              mybatis-demo
                              \n\u2514\u2500\u2500 src
                              \n \u2514\u2500\u2500 main
                              \n \u251c\u2500\u2500 java
                              \n \u2502 \u2514\u2500\u2500 com.mybatisdemo
                              \n \u2502 \u251c\u2500\u2500 mapper
                              \n \u2502 \u2502 \u2514\u2500\u2500 UserMapper.java
                              \n \u2502 \u251c\u2500\u2500 pojo
                              \n \u2502 \u2502 \u2514\u2500\u2500 User.java
                              \n \u2502 \u2514\u2500\u2500 MybatisDemoApplication.java
                              \n \u2514\u2500\u2500 resources
                              \n \u251c\u2500\u2500 com.mybatisdemo.mapper
                              \n \u2502 \u2514\u2500\u2500 UserMapper.xml
                              \n \u2514\u2500\u2500 application.properties<\/p>\n","protected":false},"excerpt":{"rendered":"

                              MyBatis
                              \n\u4e00\u3001\u81ea\u589e ID \u63d2\u5165\u89c4\u5219
                              \n\u6570\u636e\u5e93\u5b57\u6bb5\u8bbe\u4e3a\u81ea\u589e（\u5982 MySQL AUTO_INCREMENT），INSERT \u8bed\u53e5\u7701\u7565\u81ea\u589e\u5b57\u6bb5，\u6570\u636e\u5e93\u81ea\u52a8\u751f\u6210 ID；\u5b9e\u4f53\u7c7b\u4e2d\u81ea\u589e\u5b57\u6bb5\u65e0\u9700\u8d4b\u503c（\u9ed8\u8ba4 null \u5373\u53ef），MyBatis \u53ef\u901a\u8fc7Options(useGeneratedKeys true, keyProperty \\”id\\”)\u5c06\u751f\u6210\u7684 ID \u56de\u663e\u5230\u5b9e\u4f53&#x<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1769,371,305],"topic":[],"class_list":["post-69103","post","type-post","status-publish","format-standard","hentry","category-server","tag-mybatis","tag-371","tag-305"],"yoast_head":"\nday-8 MyBatis - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/69103.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"day-8 MyBatis - 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