mybatis的一堆多映射使用配置

自己仿站jeep官网在制作商城时，商品详情页面需要带着一个商品的信息，商品的配置，配置对应的颜色，商品的图片   如图

首先设计业务bean

一辆车的信息

业务一对多的大业务bean，继承Car.java

 

 几个list的类型不做赘述，本博客主要讲映射

对应的marrp.xml中设置

创建

<resultMap type="cn.jeep.CarBean.detailsCar" id="oneCar">
          <id column="carid" jdbcType="VARCHAR" property="carid" />
        <result column="carimg" jdbcType="VARCHAR" property="carimg" />
        <result column="carname" jdbcType="VARCHAR" property="carname" />
        <result column="cartext" jdbcType="VARCHAR" property="cartext" />
        <result column="carzt" jdbcType="INTEGER" property="carzt" />
        <!-- 多表 -->
        <!-- 配置信息 -->
        <collection property="peizhi" ofType="cn.jeep.CarBean.carPeizhi" javaType="java.util.ArrayList" column="carid" select="selectPerizhi">
             <id column="zys_carpeizhi_id" jdbcType="VARCHAR" property="carid" />
            <result column="pid" jdbcType="VARCHAR" property="pid" />
            <result column="pname" jdbcType="VARCHAR" property="pname" />
            <result column="pzt" jdbcType="INTEGER" property="pzt" />
        </collection>
        <!-- 配置图片 -->    
         <collection property="liimg" ofType="cn.jeep.CarBean.carImg" javaType="java.util.ArrayList" column="carid" select="selectPimg">
              <id column="carid" jdbcType="VARCHAR" property="carid" />
            <result column="carimg" jdbcType="VARCHAR" property="carimg" />
        </collection>
       <!--  详细配置图片 -->
        <collection property="liximg" ofType="cn.jeep.CarBean.xCarImg" javaType="java.util.ArrayList" column="carid" select="selectPximg">
              <id column="xcarid" jdbcType="VARCHAR" property="xcarid" />
            <result column="xcarimg" jdbcType="VARCHAR" property="xcarimg" />
        </collection>
      </resultMap>
      <!-- 多表 -->
    <!-- 配置信息 -->
      <resultMap id="perizhiMap" type="cn.jeep.CarBean.carPeizhi">
          <id column="zys_carpeizhi_id" jdbcType="VARCHAR" property="carid" />
        <result column="pid" jdbcType="VARCHAR" property="pid" />
        <result column="pname" jdbcType="VARCHAR" property="pname" />
        <result column="pzt" jdbcType="INTEGER" property="pzt" />
    </resultMap>
    <!-- 配置图片 -->    
      <resultMap id="carImg" type="cn.jeep.CarBean.carImg">
              <id column="carid" jdbcType="VARCHAR" property="carid" />
            <result column="carimg" jdbcType="VARCHAR" property="carimg" />
    </resultMap>
    <!-- 详细配置图片 -->    
      <resultMap id="xcarImg" type="cn.jeep.CarBean.xCarImg">
              <id column="xcarid" jdbcType="VARCHAR" property="xcarid" />
            <result column="xcarimg" jdbcType="VARCHAR" property="xcarimg" />
    </resultMap>
    <!-- 第一个配置颜色 -->
    <resultMap id="selectPcolor" type="cn.jeep.CarBean.peizhiColor">
              <id column="colorid" jdbcType="VARCHAR" property="colorid" />
            <result column="colorname" jdbcType="VARCHAR" property="colorname" />
    </resultMap>

多次尝试，常规使用的一对多映射不需要写每个bean独立的    resultMap   但是映射过程中打断点发现所有list只能取到每个的第一行数据。

      <!-- 封装大型产品详情页的业务bean -->
      
      <!-- 测试多字段映射===================================================  -->
      <select id="detailsCars" resultMap="oneCar">
        SELECT 
        zys_cark.`carid`,
        zys_cark.`carimg`,
        zys_cark.`carname`,
        zys_cark.`cartext`,
        zys_cark.`carzt`
        from zys_cark
        WHERE zys_cark.`carid`=#{carid}
      </select>
      <!-- 配置图片 -->    
      <select id="selectPerizhi" resultMap="perizhiMap">
          select * from zys_carpeizhi where zys_carpeizhi.`carid` =#{carid}
      </select>
      <!-- 详细配置 -->
      <select id="selectPimg" resultMap="carImg">
          SELECT * FROM zys_carimg WHERE carid=#{#carid}
      </select>
      <!-- 详细图片 -->
      <select id="selectPximg" resultMap="xcarImg">
          select * from zys_xcarimg where xcarid=#{carid}
      </select>
      
      <!-- 查一个汽车配置的颜色 -->
      <select id="selectOneColor" resultMap="selectPcolor">
          SELECT zys_pcolor.`colorid`,zys_color.`colorname`,zys_pcolor.`czt` FROM zys_carpeizhi JOIN zys_pcolor JOIN zys_color 
        ON zys_carpeizhi.`pid`=zys_pcolor.`pid` AND zys_color.`colorid`=zys_pcolor.`colorid` WHERE zys_carpeizhi.`pid`=#{pid}
      </select>