当一个collection 定义了一个columnPrefix时,其含义是将前缀自动添加到它下面的column中,如下所示:

  • <resultMap id="blogResult" type="Blog">
  • <id property="id" column="blog_id" />
  • <result property="title" column="blog_title"/>
  • <collection property="posts" ofType="Post" resultMap="blogPostResult" columnPrefix="post_"/>
  • </resultMap>
  • <resultMap id="blogPostResult" type="Post">
  • <id property="id" column="id"/> <!--在collection中则表示为:post_id-->
  • <result property="subject" column="subject"/> <!--在collection中则表示为:post_subject-->
  • <result property="body" column="body"/> <!--在collection中则表示为:post_body-->
  • </resultMap>

等价于:

  • <resultMap id="blogResult" type="Blog">
  • <id property="id" column="blog_id" />
  • <result property="title" column="blog_title"/>
  • <collection property="posts" ofType="Post">
  • <id property="id" column="post_id"/>
  • <result property="subject" column="post_subject"/>
  • <result property="body" column="post_body"/>
  • </collection>
  • </resultMap>

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