{"id":14302,"date":"2023-12-04T01:21:42","date_gmt":"2023-12-03T17:21:42","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=14302"},"modified":"2023-12-04T01:22:35","modified_gmt":"2023-12-03T17:22:35","slug":"mybatis-de-biao-guan-lian-de-ying-she","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/mybatis-de-biao-guan-lian-de-ying-she\/","title":{"rendered":"MyBatis \u7684\u8868\u5173\u8054\u7684\u6620\u5c04\uff1f"},"content":{"rendered":"

\u5728 MyBatis \u4e2d\u8fdb\u884c\u8868\u5173\u8054\u7684\u6620\u5c04\uff0c\u53ef\u4ee5\u901a\u8fc7 SQL \u8bed\u53e5\u548c\u7ed3\u679c\u6620\u5c04\u6765\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u4e00\u5bf9\u4e00\u548c\u4e00\u5bf9\u591a\u5173\u8054\u7684\u6620\u5c04\u793a\u4f8b\uff1a<\/p>\n

\u4e00\u5bf9\u4e00\u5173\u8054\uff1a<\/h3>\n

\u5047\u8bbe\u6709\u4e24\u5f20\u8868\uff1ausers<\/code> \u548c user_details<\/code>\uff0c\u5b83\u4eec\u4e4b\u95f4\u901a\u8fc7\u7528\u6237ID\u5173\u8054\u3002<\/p>\n

    \n
  1. XML \u6620\u5c04\u6587\u4ef6\u65b9\u5f0f\uff1a<\/strong><\/li>\n<\/ol>\n
    <!-- UserMapper.xml -->\n<select id=\"getUserWithDetailsById\" resultMap=\"UserWithDetailsResultMap\">\n    SELECT u.*, d.address, d.phone \n    FROM users u \n    LEFT JOIN user_details d ON u.id = d.user_id \n    WHERE u.id = #{id}\n<\/select>\n\n<resultMap id=\"UserWithDetailsResultMap\" type=\"User\">\n    <id property=\"id\" column=\"id\"\/>\n    <result property=\"name\" column=\"name\"\/>\n    <!-- Other properties from users table -->\n\n    <association property=\"details\" javaType=\"UserDetails\">\n        <result property=\"address\" column=\"address\"\/>\n        <result property=\"phone\" column=\"phone\"\/>\n        <!-- Other properties from user_details table -->\n    <\/association>\n<\/resultMap>\n<\/code><\/pre>\n
      \n
    1. \u6ce8\u89e3\u65b9\u5f0f\uff1a<\/strong><\/li>\n<\/ol>\n
      public class User {\n    private int id;\n    private String name;\n    \/\/ Other properties\n\n    private UserDetails details;\n    \/\/ Getter and Setter\n}\n\npublic class UserDetails {\n    private String address;\n    private String phone;\n    \/\/ Other properties\n    \/\/ Getter and Setter\n}\n\n@Results({\n    @Result(property = \"id\", column = \"id\"),\n    @Result(property = \"name\", column = \"name\"),\n    \/\/ Other results from users table\n\n    @Result(property = \"details.address\", column = \"address\"),\n    @Result(property = \"details.phone\", column = \"phone\")\n    \/\/ Other results from user_details table\n})\n@Select(\"SELECT u.*, d.address, d.phone FROM users u LEFT JOIN user_details d ON u.id = d.user_id WHERE u.id = #{id}\")\nUser getUserWithDetailsById(int id);\n<\/code><\/pre>\n
      \u4e00\u5bf9\u591a\u5173\u8054\uff1a<\/h3>\n
      \u5047\u8bbe\u6709\u4e24\u5f20\u8868\uff1ausers<\/code> \u548c orders<\/code>\uff0c\u4e00\u4e2a\u7528\u6237\u53ef\u4ee5\u6709\u591a\u4e2a\u8ba2\u5355\u3002<\/p>\n
        \n
      1. XML \u6620\u5c04\u6587\u4ef6\u65b9\u5f0f\uff1a<\/strong><\/li>\n<\/ol>\n
        <!-- UserMapper.xml -->\n<select id=\"getUserWithOrdersById\" resultMap=\"UserWithOrdersResultMap\">\n    SELECT u.*, o.order_id, o.order_date, o.amount\n    FROM users u\n    LEFT JOIN orders o ON u.id = o.user_id\n    WHERE u.id = #{id}\n<\/select>\n\n<resultMap id=\"UserWithOrdersResultMap\" type=\"User\">\n    <id property=\"id\" column=\"id\"\/>\n    <result property=\"name\" column=\"name\"\/>\n    <!-- Other properties from users table -->\n\n    <collection property=\"orders\" ofType=\"Order\">\n        <id property=\"orderId\" column=\"order_id\"\/>\n        <result property=\"orderDate\" column=\"order_date\"\/>\n        <result property=\"amount\" column=\"amount\"\/>\n        <!-- Other properties from orders table -->\n    <\/collection>\n<\/resultMap>\n<\/code><\/pre>\n
          \n
        1. \u6ce8\u89e3\u65b9\u5f0f\uff1a<\/strong><\/li>\n<\/ol>\n
          public class User {\n    private int id;\n    private String name;\n    \/\/ Other properties\n\n    private List<Order> orders;\n    \/\/ Getter and Setter\n}\n\npublic class Order {\n    private int orderId;\n    private Date orderDate;\n    private double amount;\n    \/\/ Other properties\n    \/\/ Getter and Setter\n}\n\n@Results({\n    @Result(property = \"id\", column = \"id\"),\n    @Result(property = \"name\", column = \"name\"),\n    \/\/ Other results from users table\n\n    @Result(property = \"orders\", column = \"id\", javaType = List.class,\n        many = @Many(select = \"getOrdersByUserId\"))\n})\n@Select(\"SELECT * FROM users WHERE id = #{id}\")\nUser getUserWithOrdersById(int id);\n\n@Select(\"SELECT * FROM orders WHERE user_id = #{userId}\")\nList<Order> getOrdersByUserId(int userId);\n<\/code><\/pre>\n
          \u4ee5\u4e0a\u5c55\u793a\u4e86\u4e00\u5bf9\u4e00\u548c\u4e00\u5bf9\u591a\u7684\u8868\u5173\u8054\u6620\u5c04\u65b9\u5f0f\uff0c\u901a\u8fc7 MyBatis \u7684\u7ed3\u679c\u6620\u5c04\u673a\u5236\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u5904\u7406\u591a\u8868\u5173\u8054\u67e5\u8be2\uff0c\u5e76\u5c06\u7ed3\u679c\u6620\u5c04\u5230 Java \u5bf9\u8c61\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u5728 MyBatis \u4e2d\u8fdb\u884c\u8868\u5173\u8054\u7684\u6620\u5c04\uff0c\u53ef\u4ee5\u901a\u8fc7 SQL \u8bed\u53e5\u548c\u7ed3\u679c\u6620\u5c04\u6765\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u4e00\u5bf9\u4e00\u548c\u4e00\u5bf9\u591a\u5173\u8054\u7684\u6620\u5c04 […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113],"tags":[],"class_list":["post-14302","post","type-post","status-publish","format-standard","hentry","category-mybatis"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=14302"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14302\/revisions"}],"predecessor-version":[{"id":14303,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14302\/revisions\/14303"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=14302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=14302"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=14302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}