{"id":923,"date":"2021-09-09T14:34:27","date_gmt":"2021-09-09T06:34:27","guid":{"rendered":"https:\/\/fireinsect.top\/?p=923"},"modified":"2021-10-06T08:01:58","modified_gmt":"2021-10-06T00:01:58","slug":"mybatis%e5%9f%ba%e7%a1%802%ef%bc%88xml%ef%bc%89","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2021\/09\/09\/mybatis%e5%9f%ba%e7%a1%802%ef%bc%88xml%ef%bc%89\/","title":{"rendered":"MyBatis\u57fa\u78402\uff08XML\uff09"},"content":{"rendered":"\n

XML\u6a21\u5f0f\u5f00\u53d1\u987a\u5e8f\uff1a<\/p>\n\n\n\n

  1. \u521b\u5efaDO\u5bf9\u8c61<\/li>
  2. \u521b\u5efaDAO\u5bf9\u8c61\uff0c\u914d\u7f6e@Mapper<\/strong>\u6ce8\u89e3<\/li>
  3. \u521b\u5efaXML\u6587\u4ef6\uff0c\u5e76\u5b8c\u6210resultMap<\/strong>\u914d\u7f6e<\/li>
  4. \u521b\u5efa\u5bf9\u5e94\u7684XML\u8bed\u53e5<\/li><\/ol>\n\n\n\n\n\n\n\n
    <\/div>\n\n\n\n

    \u5728MyBatis\u4e2d\u4f7f\u7528XML\u9996\u5148\u9700\u8981\u5728 application.properties \u6587\u4ef6\u4e2d\u6dfb\u52a0\u914d\u7f6e\u3002<\/p>\n\n\n\n

    mybatis.mapper-locations=classpath:com\/youkeda\/dao\/*.xml,classpath:com\/youkeda\/comment\/dao\/*.xml<\/code><\/pre>\n\n\n\n
    \u4e00\u822c\u6765\u8bf4\u8fd9\u4e2a\u8def\u5f84\u548cDAO\u7684\u5305\u8def\u5f84\u4e00\u81f4\uff0c\u4e00\u4e2aDAO\u7c7b\u5bf9\u5e94\u4e00\u4e2aXML\u6587\u4ef6<\/p>\n\n\n\n
    <?xml version=\"1.0\" encoding=\"UTF-8\"?><\/strong>\n<!DOCTYPE mapper PUBLIC \"-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN\"\n        \"http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd\"><\/strong>\n\/\/\u4ee5\u4e0a\u4e3a\u5934\u4fe1\u606f\n<mapper namespace=\"com.youkeda.comment.dao.UserDAO\">\n<\/mapper><\/code><\/pre>\n\n\n\n
    XML\u5728\u5199\u5165\u5934\u4fe1\u606f\u540e\u9700\u8981\u7ee7\u7eed\u6dfb\u52a0mapper\u8282\u70b9\uff0c\u8282\u70b9\u5b58\u5728 namespace<\/strong> \u5c5e\u6027\u8868\u793a\u547d\u540d\u7a7a\u95f4\uff0c\u4e00\u822c\u8fd9\u91cc\u6240\u5bf9\u5e94\u7684DAO\u7684\u5168\u79f0\u3002<\/p>\n\n\n\n
    <\/div>\n\n\n\n
    resultMap<\/p>\n\n\n\n
    resultMap\u7528\u4e8e\u5904\u7406\u8868\u548cDO\u5bf9\u8c61\u7684\u5c5e\u6027\u6620\u5c04\uff0c\u786e\u4fdd\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u6bb5\u90fd\u6709\u5c5e\u6027\u53ef\u4ee5\u5339\u914d<\/p>\n\n\n\n
    <mapper namespace=\"com.youkeda.comment.dao.UserDAO\">\n\n  <resultMap id=\"userResultMap\" type=\"com.youkeda.comment.dataobject.UserDO\">\n    <id column=\"id\" property=\"id\"\/>\n    <result column=\"user_name\" property=\"userName\"\/>\n  <\/resultMap>\n\n<\/mapper><\/code><\/pre>\n\n\n\n
    <\/div>\n\n\n\n
    resultMap\u4e2d\u7684\u5c5e\u6027\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    • id<\/strong>  \u552f\u4e00\u6807\u8bc6\uff0c\u4e00\u822c\u547d\u540d\u4e3a xxxResultMap<\/strong><\/li>
    • type<\/strong> \u5bf9\u5e94\u7684DO\u7c7b\u5b8c\u6574\u8def\u5f84<\/li><\/ul>\n\n\n\n
       <\/p>\n\n\n\n
      resultMap\u7684\u5b50\u8282\u70b9\uff1a<\/p>\n\n\n\n
      • id<\/strong>  \u8bbe\u7f6e\u6570\u636e\u5e93\u4e3b\u952e\u5b57\u6bb5\u4fe1\u606f\uff0ccolumn\u5c5e\u6027\u5bf9\u5e94\u7684\u662f\u8868\u7684\u5b57\u6bb5\u540d\uff0cproperty\u5bf9\u5e94\u7684\u662fDO\u5c5e\u6027\u540d\u79f0<\/li>
      • result<\/strong>  \u8bbe\u7f6e\u6570\u636e\u5e93\u5176\u4ed6\u5b57\u6bb5\u4fe1\u606f\uff0ccolumn\u5c5e\u6027\u5bf9\u5e94\u7684\u662f\u8868\u7684\u5b57\u6bb5\u540d\uff0cproperty\u5bf9\u5e94\u7684\u662fDO\u5c5e\u6027\u540d\u79f0<\/li><\/ul>\n\n\n\n
        <\/div>\n\n\n\n
        resultMap\u4e5f\u5b58\u5728\u5b50\u8282\u70b9 <association><\/strong> \u7528\u4e8e\u805a\u5408\u5176\u4ed6\u5bf9\u8c61\uff1a<\/p>\n\n\n\n
                      <association property=\"author\" javaType=\"com.youkeda.comment.model.User\">\n            <id column=\"user_id\" property=\"id\"\/>\n            <result column=\"user_name\" property=\"userName\"><\/result>\n            <result column=\"nick_name\" property=\"nickName\"><\/result>\n            <result column=\"avatar\" property=\"avatar\"><\/result>\n        <\/association><\/code><\/pre>\n\n\n\n
        \u5176\u4e2d javaType<\/strong> \u8868\u793a\u5bf9\u5e94\u662f\u6570\u636e\u6a21\u578b\uff0cproperty \u5bf9\u5e94\u7684\u662f\u8868\u4e2d\u5b57\u6bb5\u540d<\/p>\n\n\n\n
        <\/div>\n\n\n\n
        XML\u5b9e\u73b0Insert\u529f\u80fd<\/p>\n\n\n\n
        <insert id=\"add\" parameterType=\"com.youkeda.comment.dataobject.UserDO\" >\n    INSERT INTO user (user_name, pwd, nick_name,avatar,gmt_created,gmt_modified)\n    VALUES(#{userName}, #{pwd}, #{nickName}, #{avatar},now(),now())\n  <\/insert>\n<\/code><\/pre>\n\n\n\n
        \u5c5e\u6027\uff1a<\/p>\n\n\n\n
        • id <\/strong>\u540cDAO\u7c7b\u7684\u65b9\u6cd5\u540d\uff0c\u540c\u4e00\u4e2axml\u5185\u662f\u8981\u552f\u4e00\u7684\u3002<\/li>
        • parameterType<\/strong> \u7528\u4e8e\u4f20\u9012\u53c2\u6570\u7c7b\u578b\uff0c\u4e00\u822c\u662f\u548cDAO\u5185\u5bf9\u5e94\u65b9\u6cd5\u7684\u53c2\u6570\u7c7b\u578b\u4e00\u81f4<\/li>
        • \u4ee5\u4e0a\u4e24\u4e2a\u5c5e\u6027\u4e5f\u9002\u7528\u4e8e update\u3001delete\u3001select \u8bed\u53e5\u4e2d<\/span><\/li><\/ul>\n\n\n\n
          \u5982\u4e4b\u524d\u7684DAO\u5185\u5199\u5165Insert\u65b9\u6cd5\uff0cXML\u4e5f\u53ef\u4ee5\u4fee\u6539\u4e3b\u952e\u8bbe\u7f6e<\/p>\n\n\n\n
          <insert id=\"add\" parameterType=\"com.youkeda.comment.dataobject.UserDO\" useGeneratedKeys=\"true\" keyProperty=\"id\"><\/code><\/pre>\n\n\n\n
          \u4e0eDAO\u5185 @Options<\/strong> \u6ce8\u89e3\u6548\u679c\u76f8\u540c<\/p>\n\n\n\n
           <\/p>\n\n\n\n
          Update\/Delete\u8bed\u53e5\u540c\u7406<\/p>\n\n\n\n
          <update id=\"update\" parameterType=\"com.youkeda.comment.dataobject.UserDO\">\n        update user set nick_name=#{nickName},gmt_modified=now() where id=#{id}\n<\/update><\/code><\/pre>\n\n\n\n
           <delete id=\"delete\">\n        delete from user where id=#{id}\n <\/delete><\/code><\/pre>\n\n\n\n
          \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u56e0\u4e3a\u6211\u4eec\u5728\u5199\u5220\u9664\u8bed\u53e5\u7684DAO\u65f6\uff0c\u8bed\u53e5\u4e3a<\/p>\n\n\n\n
          int<\/strong> delete<\/strong>(@Param(\"id\")<\/strong> long<\/strong> id);<\/code><\/pre>\n\n\n\n
          @Param<\/strong>\u4f20\u5165\u7684\u53c2\u6570\uff08\u8be6\u89c1\u6ce8\u89e3\u6574\u7406\uff09\u662f\u666e\u901a\u53c2\u6570\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u8fd9\u7c7b\u6570\u636e\u4f1a\u88ab\u5f53\u505a Map<\/strong> \u7c7b\u578b\u4f20\u5165\uff0c\u800cparameterType<\/strong>\u9ed8\u8ba4\u7684\u7c7b\u578b\u5c31\u662f Map<\/strong> \u56e0\u6b64\u8fd9\u91cc\u53ef\u4ee5\u628a\u7c7b\u578b\u6307\u5b9a\u7701\u7565\u3002<\/p>\n\n\n\n
          <\/div>\n\n\n\n
          Select\u8bed\u53e5<\/p>\n\n\n\n
          select\u8bed\u53e5\u7531\u4e8e\u662f\u83b7\u53d6\u6570\u636e\uff0c\u4e0e\u4e0a\u9762\u51e0\u4e2a\u8bed\u53e5\u4e0d\u540c\uff0c\u6240\u4ee5\u8bed\u6cd5\u4e5f\u4e0d\u540c<\/p>\n\n\n\n
          <select id=\"findByUserName\" resultMap=\"userResultMap\">\n  select * from user where user_name=#{userName} limit 1\n<\/select><\/code><\/pre>\n\n\n\n
          \u8fd9\u91cc\u4f7f\u7528\u4e86 resultMap<\/strong> \u5c5e\u6027\uff0c\u5b83\u7684\u503c\u4e00\u822c\u4e3aXML\u6587\u4ef6\u4e0b resultMap<\/strong> \u8282\u70b9\u7684id\u503c\uff0c\u53ef\u4ee5\u5c06\u83b7\u53d6\u7684\u6570\u636e\u901a\u8fc7 resultMap<\/strong> \u8282\u70b9\u96c6\u4f53\u6620\u5c04\u3002<\/p>\n\n\n\n
          <\/div>\n\n\n\n
          if\u8bed\u53e5<\/p>\n\n\n\n
          XML\u6a21\u5f0f\u662f\u652f\u6301\u6dfb\u52a0if\u8bed\u53e5\u7684\u5982\uff1a<\/p>\n\n\n\n
          <update id=\"update\" parameterType=\"com.youkeda.comment.dataobject.UserDO\">\n  update user set\n   <if test=\"nickName != null\">\n    nick_name=#{nickName},gmt_modified=now()\n   <\/if>\n   where id=#{id}\n<\/update><\/code><\/pre>\n\n\n\n
          \u5176\u4e2d if<\/strong> \u5b58\u5728\u5c5e\u6027 test<\/strong> \u8868\u660e if<\/strong> \u7684\u6761\u4ef6<\/p>\n\n\n\n
          <\/div>\n\n\n\n
          set\u8bed\u53e5<\/p>\n\n\n\n
          \u5728\u5b9e\u9645\u4f7f\u7528if\u8bed\u53e5\u4e2d\uff0c\u53ef\u80fd\u4f1a\u4ea7\u751f\u7531\u4e8e\u6761\u4ef6\u4e0d\u6ee1\u8db3\u800c\u5bfc\u81f4SQL\u8bed\u53e5\u9519\u8bef\uff0c\u6211\u4eec\u4e00\u822c\u914d\u5408 set\u6807\u7b7e\u6765\u5b8c\u6210 update<\/p>\n\n\n\n
          <update id=\"update\" parameterType=\"com.youkeda.comment.dataobject.UserDO\">\n  update user\n  <set>\n    <if test=\"nickName != null\">\n      nick_name=#{nickName},\n    <\/if>\n    <if test=\"avatar != null\">\n      avatar=#{avatar},\n    <\/if>\n    gmt_modified=now()\n  <\/set>\n   where id=#{id}\n<\/update><\/code><\/pre>\n\n\n\n
          \u8fd9\u91cc\u901a\u8fc7 set<\/strong> \u6807\u7b7e\u4ee3\u66ff\u4e86SQL\u8bed\u53e5\u4e2d\u7684set<\/strong> \uff0c\u4f46\u6ce8\u610f\u7684\u662f\u5176\u4e2d\u7684\u9017\u53f7\u4e0d\u80fd\u6f0f\u6389\uff0c\u4e14\u4f7f\u7528 <set><\/strong> \u7cfb\u7edf\u4f1a\u81ea\u52a8\u53bb\u9664\u6700\u540e\u4e00\u4e2a\u9017\u53f7\uff0c\u800c\u4e0d\u7528\u62c5\u5fc3\u54ea\u4e00\u5217\u624d\u662f\u6700\u540e\u4e00\u4e2a\u3002<\/p>\n\n\n\n
          <\/div>\n\n\n\n
          if+select<\/p>\n\n\n\n
          \u5148\u770b\u4f8b\u5b50<\/p>\n\n\n\n
          <select id=\"search\" resultMap=\"userResultMap\">\n  select * from user where\n    <if test=\"keyWord != null\">\n      user_name like CONCAT('%',#{keyWord},'%')\n        or nick_name like CONCAT('%',#{keyWord},'%')\n    <\/if>\n    <if test=\"time != null\">\n      and  gmt_created <![CDATA[ >= ]]> #{time}\n    <\/if>\n<\/select><\/code><\/pre>\n\n\n\n
          \u8fd9\u91cc >=\u3001<\u3001<=\u3001>\u3001&\u3001|<\/strong> \u8fd9\u7c7b\u8868\u8fbe\u5f0f\u4f1a\u5bfc\u81f4MyBatis\u89e3\u6790\u5931\u8d25\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f7f\u7528  <![CDATA[ key ]]><\/strong> \u6765\u5305\u88f9<\/p>\n\n\n\n
          <\/div>\n\n\n\n
          \u7c7b\u4f3c\u4e8e Insert\u4e2d\u7684 set<\/strong> \u53ef\u4ee5\u7528 <set><\/strong> \u8bed\u53e5\u4ee3\u66ff\uff0cselect\u4e2d\u7684 where<\/strong> \u4e5f\u53ef\u4ee5\u7528 <where><\/strong> \u8bed\u53e5\u4ee3\u66ff<\/p>\n\n\n\n
             <where>\n      <if test=\"keyWord != null\">\n          user_name like CONCAT('%',#{keyWord},'%')\n            or nick_name like CONCAT('%',#{keyWord},'%')\n      <\/if>\n      <if test=\"time != null\">\n        and  gmt_created <![CDATA[ >= ]]> #{time}\n      <\/if>\n   <\/where><\/code><\/pre>\n\n\n\n
          <\/div>\n\n\n\n
          \u5faa\u73af\u8bed\u53e5<\/p>\n\n\n\n
          XML\u5b58\u5728\u5faa\u73af\u8bed\u53e5 <foreach><\/strong><\/p>\n\n\n\n
          <insert id=\"batchAdd\" parameterType=\"java.util.List\" useGeneratedKeys=\"true\" keyProperty=\"id\">\n    INSERT INTO user (user_name, pwd, nick_name,avatar,gmt_created,gmt_modified)\n    VALUES\n    <foreach collection=\"list\" item=\"it\" index=\"index\" separator =\",\">\n        (#{it.userName}, #{it.pwd}, #{it.nickName}, #{it.avatar},now(),now())\n    <\/foreach >\n<\/insert><\/code><\/pre>\n\n\n\n
          \u5c5e\u6027\uff1a<\/p>\n\n\n\n
          • collection<\/strong> \u6307\u5b9a\u96c6\u5408\u7684\u4e0a\u4e0b\u6587\u53c2\u6570\u540d\u79f0\uff0c\u6bd4\u5982\u8fd9\u91cc\u7684list \u5bf9\u5e94 @Param(“list”)<\/strong><\/li>
          • item<\/strong> \u6307\u5b9a\u904d\u5386\u4e2d\u6bcf\u4e00\u4e2a\u6570\u636e\u7684\u53d8\u91cf\u7684\u6307\u4ee3\u540d\uff0c\u4e00\u8fb9\u7528it\u547d\u540d<\/li>
          • index<\/strong> \u96c6\u5408\u7684\u7d22\u5f15\u503c\u540d\u79f0\u6307\u5b9a<\/li>
          • separator<\/strong> \u904d\u5386\u6bcf\u6761\u8bb0\u5f55\u5e76\u6dfb\u52a0\u5206\u9694\u7b26<\/li>
          • open<\/strong> \u8868\u793a\u8282\u70b9\u5f00\u59cb\u65f6\u7684\u5206\u9694\u7b26\u5373\u6240\u6709\u6570\u636e\u524d\u9762\u7684\u7b26\u53f7<\/li>
          • close<\/strong> \u8868\u793a\u8282\u70b9\u7ed3\u675f\u65f6\u7684\u5206\u9694\u7b26\u5373\u6240\u6709\u6570\u636e\u4e4b\u540e\u7684\u7b26\u53f7<\/li><\/ul>\n\n\n\n
            \u4e0a\u9762\u4ee3\u7801\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n
            INSERT<\/strong> INTO<\/strong> user<\/strong> (user_name, pwd, nick_name,avatar,gmt_created,gmt_modified)\n    VALUES<\/strong>\n    (?, ?, ?,?,now(),now()),\n    (?, ?, ?,?,now(),now()),\n    (?, ?, ?,?,now(),now())<\/code><\/pre>\n\n\n\n
            MyBatis\u4f1a\u81ea\u52a8\u4f18\u5316\u6700\u540e\u4e00\u4e2a\u9017\u53f7\uff0c\u786e\u4fddSQL\u6b63\u786e\u3002<\/p>\n\n\n\n
            \u6dfb\u52a0\u4e0aopen\u548cclose\uff1a<\/p>\n\n\n\n
            <select id=\"findByIds\" resultMap=\"userResultMap\">\n    select * from user\n    <where>\n        id in\n        <foreach item=\"item\" index=\"index\" collection=\"ids\"\n                    open=\"(\" separator=\",\" close=\")\">\n            #{item}\n        <\/foreach>\n    <\/where>\n<\/select><\/code><\/pre>\n\n\n\n
            \u5176\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n
            select<\/strong> * from<\/strong> user<\/strong> where<\/strong> id in<\/strong> (?,?,?)<\/code><\/pre>\n\n\n\n
            <\/div>\n\n\n\n
            \u914d\u7f6e\u4f18\u5316<\/p>\n\n\n\n
            \u5f53\u6570\u636eJSON\u8f93\u51fa\u65f6\uff0c\u4f1a\u5b58\u5728null\u6570\u636e\uff0c\u6211\u4eec\u9700\u8981\u5ffd\u7565\u5b83\u6765\u8282\u7ea6\u6d41\u91cf\uff0c\u901a\u8fc7\u4fee\u6539\u914d\u7f6e\u6587\u4ef6 application.properties<\/strong> \u6765\u5b8c\u6210<\/p>\n\n\n\n
            spring.jackson.deserialization.fail-on-unknown-properties=false\nspring.jackson.default-property-inclusion=non_null<\/code><\/pre>\n\n\n\n
            \u4e24\u4e2a\u914d\u7f6e\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n\n\n\n
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