{"id":120,"date":"2024-09-04T18:12:53","date_gmt":"2024-09-04T10:12:53","guid":{"rendered":"https:\/\/wbki.net\/?p=120"},"modified":"2024-09-04T18:20:56","modified_gmt":"2024-09-04T10:20:56","slug":"java-mybatis%e6%a1%86%e6%9e%b6%e7%9a%84%e4%b8%80%e4%ba%9b%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/wbki.net\/?p=120","title":{"rendered":"Java MyBatis\u6846\u67b6\u7684\u4e00\u4e9b\u77e5\u8bc6"},"content":{"rendered":"\n

<resultMap><\/code> \u6807\u7b7e<\/h2>\n\n\n\n

<resultMap><\/code> \u6807\u7b7e\u901a\u5e38\u5728 MyBatis \u7684\u6620\u5c04\u6587\u4ef6\uff08XML \u914d\u7f6e\u6587\u4ef6\uff09\u4e2d\u5b9a\u4e49\uff0c\u5176\u57fa\u672c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n\n\n\n

<resultMap id=\"resultMapId\" type=\"fullyQualifiedClassName\">\n    <id property=\"idColumnName\" column=\"idColumn\" \/>\n    <result property=\"propertyName\" column=\"columnName\" \/>\n    <!-- \u66f4\u591a\u7684 <result> \u6807\u7b7e --><\/em>\n<\/resultMap><\/code><\/pre>\n\n\n\n
\u6ce8\u610f\u70b9\uff1atype\u6700\u597d\u4ece\u5305\u540d\u4e0b\u5f00\u59cb<\/mark><\/strong>\uff0c\u5982com.example.fullyQualifiedClassName<\/p>\n\n\n\n
\u7ec4\u6210\u90e8\u5206<\/h3>\n\n\n\n
    \n
  1. id<\/strong>: \u7528\u4e8e\u5b9a\u4e49\u552f\u4e00\u6807\u8bc6\u7b26\u7684\u6620\u5c04\u3002\u5728\u7ed3\u679c\u96c6\u4e2d\uff0c\u5e94\u8be5\u53ea\u6709\u4e00\u4e2a <id><\/code> \u6807\u7b7e\uff0c\u56e0\u4e3a\u5b83\u8868\u793a\u552f\u4e00\u952e\u3002\n
      \n
    • property<\/code>: Java \u5bf9\u8c61\u7684\u5c5e\u6027\u540d\u3002<\/li>\n\n\n\n
    • column<\/code>: \u6570\u636e\u5e93\u8868\u4e2d\u7684\u5217\u540d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • result<\/strong>: \u7528\u4e8e\u5b9a\u4e49\u975e\u552f\u4e00\u952e\u7684\u6620\u5c04\u3002\n
        \n
      • property<\/code>: Java \u5bf9\u8c61\u7684\u5c5e\u6027\u540d\u3002<\/li>\n\n\n\n
      • column<\/code>: \u6570\u636e\u5e93\u8868\u4e2d\u7684\u5217\u540d\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n
        \u8fdb\u9636\u7279\u6027<\/h3>\n\n\n\n
          \n
        1. \u81ea\u52a8\u6620\u5c04<\/strong>:\n
            \n
          • \u5982\u679c\u67e5\u8be2\u7ed3\u679c\u4e2d\u7684\u5217\u540d\u4e0e Java \u5bf9\u8c61\u7684\u5c5e\u6027\u540d\u5b8c\u5168\u76f8\u540c\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<resultMap><\/code>\u00a0\u7684\u00a0autoMapping<\/code>\u00a0\u5c5e\u6027\u81ea\u52a8\u6620\u5c04\u8fd9\u4e9b\u5b57\u6bb5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • \u5173\u8054\u67e5\u8be2<\/strong>:
            • \u5f53\u67e5\u8be2\u6d89\u53ca\u591a\u8868\u8fde\u63a5\u5e76\u4e14\u9700\u8981\u5c06\u7ed3\u679c\u6620\u5c04\u5230\u5173\u8054\u5bf9\u8c61\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<association><\/code>\u00a0\u6807\u7b7e\u3002<\/li><\/ul><resultMap id=\"userWithRoles\" type=\"User\"> <id property=\"id\" column=\"id\" \/> <result property=\"username\" column=\"username\" \/> <association property=\"roles\" javaType=\"Role\"> <result property=\"roleId\" column=\"role_id\" \/> <result property=\"roleName\" column=\"role_name\" \/> <\/association> <\/resultMap><\/code><\/li>\n\n\n\n
            • \u96c6\u5408\u6620\u5c04<\/strong>:
              • \u5f53\u9700\u8981\u5c06\u7ed3\u679c\u96c6\u4e2d\u7684\u591a\u884c\u6570\u636e\u6620\u5c04\u5230\u4e00\u4e2a\u96c6\u5408\u5c5e\u6027\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<collection><\/code>\u00a0\u6807\u7b7e\u3002<\/li><\/ul><resultMap id=\"userWithOrders\" type=\"User\"> <id property=\"id\" column=\"id\" \/> <result property=\"username\" column=\"username\" \/> <collection property=\"orders\" ofType=\"Order\"> <id property=\"id\" column=\"order_id\" \/> <result property=\"orderDate\" column=\"order_date\" \/> <\/collection> <\/resultMap><\/code><\/li>\n\n\n\n
              • \u590d\u6742\u7c7b\u578b\u6620\u5c04<\/strong>:\n
                  \n
                • \u5bf9\u4e8e\u590d\u6742\u7c7b\u578b\uff0c\u5982 Java \u4e2d\u7684\u00a0Date<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<result><\/code>\u00a0\u6807\u7b7e\u7684\u00a0typeHandler<\/code>\u00a0\u5c5e\u6027\u6307\u5b9a\u7c7b\u578b\u5904\u7406\u5668\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                • Discriminator<\/strong>:
                  • \u7528\u4e8e\u57fa\u4e8e\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\u6765\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u7ed3\u679c\u3002\u8fd9\u5728\u5904\u7406\u7ee7\u627f\u7ed3\u6784\u6216\u591a\u6001\u65f6\u975e\u5e38\u6709\u7528\u3002<\/li><\/ul><resultMap id=\"discriminatorExample\" type=\"com.example.BaseClass\"> <discriminator column=\"type\" javaType=\"int\" typeHandler=\"com.example.IntTypeHandler\"> <case value=\"1\" resultType=\"com.example.SubClass1\"\/> <case value=\"2\" resultType=\"com.example.SubClass2\"\/> <\/discriminator> <\/resultMap><\/code><\/li>\n<\/ol>\n\n\n\n
                    \u4f7f\u7528\u793a\u4f8b<\/h3>\n\n\n\n
                    \u5047\u8bbe\u6709\u4e00\u4e2a User<\/code> \u7c7b\u548c\u4e00\u4e2a Order<\/code> \u7c7b\uff0c\u4f60\u60f3\u8981\u6267\u884c\u4e00\u4e2a\u67e5\u8be2\uff0c\u8be5\u67e5\u8be2\u8fd4\u56de\u7528\u6237\u53ca\u5176\u6240\u6709\u8ba2\u5355\u7684\u4fe1\u606f\uff1a<\/p>\n\n\n\n
                    <resultMap id=\"userWithOrdersResultMap\" type=\"User\">
                        <id property=\"id\" column=\"user_id\" \/>
                        <result property=\"username\" column=\"username\" \/>
                        <collection property=\"orders\" ofType=\"Order\">
                            <id property=\"id\" column=\"order_id\" \/>
                            <result property=\"orderDate\" column=\"order_date\" \/>
                        <\/collection>
                    <\/resultMap><\/code><\/pre>\n\n\n\n
                    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<resultMap><\/code> \u5b9a\u4e49\u4e86\u5982\u4f55\u5c06\u67e5\u8be2\u7ed3\u679c\u6620\u5c04\u5230 User<\/code> \u5bf9\u8c61\u53ca\u5176 orders<\/code> \u96c6\u5408\u5c5e\u6027\u3002<\/p>\n\n\n\n
                    <trim><\/code> \u6807\u7b7e<\/h2>\n\n\n\n
                    <trim><\/code> \u6807\u7b7e\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u52a8\u6001 SQL \u5143\u7d20\uff0c\u5b83\u5141\u8bb8\u4f60\u6784\u5efa\u4e00\u4e2a SQL \u8bed\u53e5\u7684\u7247\u6bb5\uff0c\u5176\u4e2d\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5b50\u5143\u7d20\uff0c\u8fd9\u4e9b\u5b50\u5143\u7d20\u53ef\u4ee5\u662f <where><\/code>\u3001<set><\/code>\u3001<foreach><\/code> \u7b49\u3002<trim><\/code> \u6807\u7b7e\u4f1a\u81ea\u52a8\u5730\u6839\u636e\u5b50\u5143\u7d20\u7684\u5b58\u5728\u4e0e\u5426\u6765\u6dfb\u52a0\u6216\u7701\u7565 SQL \u8bed\u53e5\u4e2d\u7684\u67d0\u4e9b\u90e8\u5206\uff0c\u5982\u9017\u53f7\u3001\u7a7a\u683c\u548c\u5173\u952e\u5b57\u3002<\/p>\n\n\n\n
                    \u57fa\u672c\u7528\u6cd5<\/h3>\n\n\n\n
                    <trim><\/code> \u6807\u7b7e\u901a\u5e38\u7528\u4e8e\u6784\u5efa\u52a8\u6001 SQL\uff0c\u5b83\u6709\u4ee5\u4e0b\u51e0\u4e2a\u5e38\u7528\u7684\u5c5e\u6027\uff1a<\/p>\n\n\n\n
                      \n
                    • prefix<\/code>\uff1a\u5728 SQL \u7247\u6bb5\u524d\u6dfb\u52a0\u7684\u6587\u672c\u3002<\/mark><\/strong><\/li>\n\n\n\n
                    • prefixOverrides<\/code>\uff1a\u79fb\u9664 SQL \u7247\u6bb5\u524d\u591a\u4f59\u7684\u6587\u672c\u3002<\/strong><\/mark><\/li>\n\n\n\n
                    • suffix<\/code>\uff1a\u5728 SQL \u7247\u6bb5\u540e\u6dfb\u52a0\u7684\u6587\u672c\u3002<\/mark><\/strong><\/li>\n\n\n\n
                    • suffixOverrides<\/code>\uff1a\u79fb\u9664 SQL \u7247\u6bb5\u540e\u591a\u4f59\u7684\u6587\u672c\u3002<\/mark><\/strong><\/li>\n<\/ul>\n\n\n\n
                      \u793a\u4f8b<\/h3>\n\n\n\n
                      \u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u7528\u6237\u8868 users<\/code>\uff0c\u8868\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                      CREATE TABLE users (\n    id INT PRIMARY KEY,\n    username VARCHAR(50),\n    email VARCHAR(100),\n    status VARCHAR(10)\n);<\/code><\/code><\/pre>\n\n\n\n
                      \u4f60\u60f3\u8981\u6784\u5efa\u4e00\u4e2a\u52a8\u6001\u67e5\u8be2\uff0c\u6839\u636e\u4f20\u5165\u7684\u6761\u4ef6\u52a8\u6001\u5730\u751f\u6210 SQL \u8bed\u53e5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 <trim><\/code> \u6807\u7b7e\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n\n\n\n
                      <select id=\"selectUsers\" resultType=\"User\">\n    SELECT id, username, email, status\n    FROM users\n    <where>\n        <trim suffixOverrides=\"AND \">\n            AND username LIKE CONCAT('%', #{username}, '%')\n            <if test=\"email != null\">\n                AND email = #{email}\n            <\/if>\n            <if test=\"status != null\">\n                AND status = #{status}\n            <\/if>\n        <\/trim>\n    <\/where>\n<\/select><\/code><\/code><\/pre>\n\n\n\n
                      \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff1a<\/p>\n\n\n\n
                        \n
                      • prefixOverrides=\"AND \"<\/code>\u00a0\u7528\u4e8e\u79fb\u9664\u6700\u540e\u4e00\u4e2a\u6761\u4ef6\u524d\u591a\u4f59\u7684 “AND “\u3002<\/li>\n\n\n\n
                      • <where><\/code>\u00a0\u6807\u7b7e\u4f1a\u81ea\u52a8\u5904\u7406 SQL \u4e2d\u7684 “WHERE” \u5173\u952e\u5b57\uff0c\u5982\u679c\u00a0<trim><\/code>\u00a0\u4e2d\u7684\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\uff0c”WHERE” \u5173\u952e\u5b57\u5c06\u4e0d\u4f1a\u88ab\u5305\u542b\u5728\u6700\u7ec8\u7684 SQL \u8bed\u53e5\u4e2d\u3002<\/li>\n\n\n\n
                      • <if><\/code>\u00a0\u6807\u7b7e\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\uff0c\u53ea\u6709\u5f53\u6d4b\u8bd5\u8868\u8fbe\u5f0f\u4e3a\u771f\u65f6\uff0c\u76f8\u5e94\u7684 SQL \u7247\u6bb5\u624d\u4f1a\u88ab\u5305\u542b\u5728\u6700\u7ec8\u7684 SQL \u8bed\u53e5\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n
                        \u52a8\u6001 SQL \u793a\u4f8b<\/h3>\n\n\n\n
                        \u5047\u8bbe\u4f60\u8c03\u7528 selectUsers<\/code> \u65b9\u6cd5\uff0c\u5e76\u4f20\u5165 username<\/code> \u4e3a \"John\"<\/code>\uff0c\u4f46\u4e0d\u4f20\u5165 email<\/code> \u548c status<\/code>\uff0c\u5219\u751f\u6210\u7684 SQL \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                        SELECT id, username, email, status\nFROM users\nWHERE username LIKE CONCAT('%John%')<\/code><\/code><\/pre>\n\n\n\n
                        \u5982\u679c\u4f60\u4f20\u5165 username<\/code> \u4e3a \"John\"<\/code>\uff0cemail<\/code> \u4e3a \"john@example.com\"<\/code>\uff0c\u548c status<\/code> \u4e3a \"active\"<\/code>\uff0c\u5219\u751f\u6210\u7684 SQL \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                        SELECT id, username, email, status\nFROM users\nWHERE username LIKE CONCAT('%John%')\nAND email = 'john@example.com'\nAND status = 'active'<\/code><\/code><\/pre>\n\n\n\n
                        \u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n
                          \n
                        • \u4f7f\u7528\u00a0<trim><\/code>\u00a0\u6807\u7b7e\u65f6\uff0c\u8981\u6ce8\u610f\u6b63\u786e\u8bbe\u7f6e\u00a0prefixOverrides<\/code>\u00a0\u548c\u00a0suffixOverrides<\/code>\u00a0\u5c5e\u6027\uff0c\u4ee5\u907f\u514d\u751f\u6210\u65e0\u6548\u7684 SQL \u8bed\u53e5\u3002<\/li>\n\n\n\n
                        • <trim><\/code>\u00a0\u6807\u7b7e\u901a\u5e38\u4e0e\u00a0<where><\/code>\u3001<set><\/code>\u00a0\u7b49\u6807\u7b7e\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u6784\u5efa\u52a8\u6001\u7684 WHERE \u5b50\u53e5\u548c SET \u5b50\u53e5\u3002<\/li>\n\n\n\n
                        • MyBatis \u4f1a\u81ea\u52a8\u5904\u7406 SQL \u8bed\u53e5\u4e2d\u7684\u7a7a\u683c\u548c\u9017\u53f7\uff0c\u786e\u4fdd\u751f\u6210\u7684 SQL \u8bed\u53e5\u662f\u6709\u6548\u7684\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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