{"id":14193,"date":"2023-12-04T00:40:52","date_gmt":"2023-12-03T16:40:52","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=14193"},"modified":"2023-12-04T00:41:45","modified_gmt":"2023-12-03T16:41:45","slug":"mybatis-neng-zhi-xing-yi-dui-duo-yi-dui-yi-de-lian","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/mybatis-neng-zhi-xing-yi-dui-duo-yi-dui-yi-de-lian\/","title":{"rendered":"MyBatis \u80fd\u6267\u884c\u4e00\u5bf9\u591a\uff0c\u4e00\u5bf9\u4e00\u7684\u8054\u7cfb\u67e5\u8be2\u5417\uff0c\u6709\u54ea\u4e9b\u5b9e\u73b0\u65b9\u6cd5\uff1f"},"content":{"rendered":"

\u662f\u7684\uff0cMyBatis \u53ef\u4ee5\u6267\u884c\u4e00\u5bf9\u591a\u3001\u4e00\u5bf9\u4e00\u7b49\u590d\u6742\u7684\u5173\u8054\u67e5\u8be2\uff0c\u5b9e\u73b0\u65b9\u6cd5\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n

\u4e00\u5bf9\u591a\u5173\u8054\u67e5\u8be2\uff1a<\/h3>\n
    \n
  1. \u4f7f\u7528\u5d4c\u5957\u67e5\u8be2\uff08Nested Queries\uff09\uff1a<\/strong> \u5728\u4e3b\u67e5\u8be2\u4e2d\u5d4c\u5957\u5b50\u67e5\u8be2\uff0c\u901a\u8fc7\u5d4c\u5957\u7684\u65b9\u5f0f\u67e5\u8be2\u76f8\u5173\u8054\u7684\u591a\u4e2a\u5bf9\u8c61\u3002\n

    \u793a\u4f8b\uff1a<\/p>\n

    <select id=\"selectBlogWithPosts\" resultMap=\"blogWithPostsResult\">\n   SELECT * FROM blogs\n   <where>\n       id = #{id}\n   <\/where>\n<\/select>\n<resultMap id=\"blogWithPostsResult\" type=\"Blog\">\n   <id property=\"id\" column=\"id\"\/>\n   <result property=\"title\" column=\"title\"\/>\n   <!-- \u5d4c\u5957\u67e5\u8be2 -->\n   <collection property=\"posts\" ofType=\"Post\" resultMap=\"postResult\">\n       SELECT * FROM posts WHERE blog_id = #{id}\n   <\/collection>\n<\/resultMap>\n<resultMap id=\"postResult\" type=\"Post\">\n   <id property=\"id\" column=\"id\"\/>\n   <result property=\"content\" column=\"content\"\/>\n<\/resultMap>\n<\/code><\/pre>\n<\/li>\n
  2. \u4f7f\u7528\u5173\u8054\u67e5\u8be2\uff08Association\uff09\uff1a<\/strong> \u5728\u6620\u5c04\u6587\u4ef6\u4e2d\u901a\u8fc7 Association \u6807\u7b7e\u6620\u5c04\u5173\u8054\u5bf9\u8c61\uff0c\u5efa\u7acb\u4e00\u5bf9\u591a\u7684\u5173\u8054\u3002\n
    \u793a\u4f8b\uff1a<\/p>\n
    <resultMap id=\"blogResult\" type=\"Blog\">\n   <id property=\"id\" column=\"id\"\/>\n   <result property=\"title\" column=\"title\"\/>\n   <!-- \u5173\u8054\u67e5\u8be2 -->\n   <association property=\"author\" column=\"author_id\" javaType=\"Author\" select=\"selectAuthor\"\/>\n   <collection property=\"posts\" ofType=\"Post\" column=\"id\" select=\"selectPostsForBlog\"\/>\n<\/resultMap>\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
    \u4e00\u5bf9\u4e00\u5173\u8054\u67e5\u8be2\uff1a<\/h3>\n
      \n
    1. \u4f7f\u7528\u5173\u8054\u67e5\u8be2\uff08Association\uff09\uff1a<\/strong> \u7c7b\u4f3c\u4e8e\u4e00\u5bf9\u591a\u7684\u5173\u8054\u67e5\u8be2\uff0c\u901a\u8fc7 Association \u6807\u7b7e\u6620\u5c04\u4e00\u5bf9\u4e00\u7684\u5173\u8054\u3002\n
      \u793a\u4f8b\uff1a<\/p>\n
      <resultMap id=\"blogResult\" type=\"Blog\">\n   <id property=\"id\" column=\"id\"\/>\n   <result property=\"title\" column=\"title\"\/>\n   <!-- \u5173\u8054\u67e5\u8be2 -->\n   <association property=\"author\" column=\"author_id\" javaType=\"Author\" select=\"selectAuthor\"\/>\n<\/resultMap>\n<\/code><\/pre>\n<\/li>\n
    2. \u5d4c\u5957\u67e5\u8be2\u65b9\u5f0f\uff1a<\/strong> \u7c7b\u4f3c\u4e00\u5bf9\u591a\u7684\u5d4c\u5957\u67e5\u8be2\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7\u5d4c\u5957\u67e5\u8be2\u5b9e\u73b0\u4e00\u5bf9\u4e00\u7684\u5173\u8054\u3002<\/p>\n<\/li>\n<\/ol>\n
      \u4ee5\u4e0a\u4e24\u79cd\u65b9\u5f0f\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u548c\u9700\u6c42\u9009\u62e9\uff0c\u901a\u8fc7 MyBatis \u63d0\u4f9b\u7684\u5d4c\u5957\u67e5\u8be2\u6216\u5173\u8054\u67e5\u8be2\u6765\u5b9e\u73b0\u4e00\u5bf9\u591a\u3001\u4e00\u5bf9\u4e00\u7684\u5173\u8054\u67e5\u8be2\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u662f\u7684\uff0cMyBatis \u53ef\u4ee5\u6267\u884c\u4e00\u5bf9\u591a\u3001\u4e00\u5bf9\u4e00\u7b49\u590d\u6742\u7684\u5173\u8054\u67e5\u8be2\uff0c\u5b9e\u73b0\u65b9\u6cd5\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a \u4e00\u5bf9\u591a\u5173\u8054\u67e5\u8be2\uff1a \u4f7f\u7528 […]<\/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-14193","post","type-post","status-publish","format-standard","hentry","category-mybatis"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14193","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=14193"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14193\/revisions"}],"predecessor-version":[{"id":14194,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14193\/revisions\/14194"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=14193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=14193"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=14193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}