zoukankan      html  css  js  c++  java
  • mybatis 一对多映射 xml

    最近在做一个评论功能时,涉及到一个评论对应多张图片,这个时候想一个方法全部返回,就需要在xml中进行配置。由于好久没用到一对多的配置,所以很长时间才写出来,mark一下

    返回对象:

    private String commentId;

    private String commentContent;

    private Date commentTime;

    private String productId;

    private String userId;

    private String userName;

    private String headImg;

    private Integer startNum;

    private Integer supportNum;

    private List<CommentImg> commentImgs;

    对应xml配置文件:

    <mapper namespace="com.lefang.lf.vo.CommentGrid">

    <resultMap type="com.lefang.lf.vo.CommentGrid" id="CommentGrid">

    <id column="COMMENT_ID" property="commentId" />       

    <result column="COMMENT_CONTENT" property="commentContent" />    

    <result column="COMMENT_TIME" property="commentTime" />       

    <result column="HEAD_IMG" property="headImg" />

    <result column="PRODUCT_ID" property="productId" />  

    <result column="USER_ID" property="userId"/>      

            <result column="USER_NAME" property="userName"/>

            <result column="START_NUM" property="startNum"/>

            <result column="SUPPORT_NUM" property="supportNum"/>

            <collection property="commentImgs" ofType="com.lefang.lf.model.CommentImg">

                <id column="img_id" property="id" />

        <result column="img_url" property="imgUrl" />

            </collection>

    </resultMap>

     

    <select id="grid" resultMap="CommentGrid">

    select distinct

    C.id COMMENT_ID,

    C.COMMENT_CONTENT,

    C.COMMENT_TIME,

    C.PRODUCT_ID,

    C.START_NUM,

    C.SUPPORT_NUM,

    C.USER_ID,

    CI.ID IMG_ID,

    CI.IMG_URL

    from

    L_LF_COMMENT C LEFT JOIN L_LF_COMMENT_IMG CI ON CI.COMMENT_ID = C.ID  

    where 1 = 1

    <if test="productId!=null">

    AND C.PRODUCT_ID =#{productId}

    </if>

    order by COMMENT_TIME desc

    </select>

    </mapper>

  • 相关阅读:
    83. Remove Duplicates from Sorted List
    35. Search Insert Position
    96. Unique Binary Search Trees
    94. Binary Tree Inorder Traversal
    117. Populating Next Right Pointers in Each Node II
    116. Populating Next Right Pointers in Each Node
    111. Minimum Depth of Binary Tree
    169. Majority Element
    171. Excel Sheet Column Number
    190. Reverse Bits
  • 原文地址:https://www.cnblogs.com/govoid/p/5557651.html
Copyright © 2011-2022 走看看