两表映射查询（1）

两表字段组合成一个实例对象查询

将两张表中的部分字段抽取出来，创建一个实例对象来接收（可以跨库）

<mapper namespace="com.hauto.connect.engine.mapper.ChannalRobotMapper">

   <resultMap type="com.hauto.connect.engine.dto.business.ChannalRobotDTO" id="ChannalRobotMap">
       <result property="companyId" column="id" jdbcType="VARCHAR"/>
       <result property="companyCode" column="company_code" jdbcType="VARCHAR"/>
       <result property="robotId" column="robot_id" jdbcType="VARCHAR"/>
       <result property="cityCode" column="city_code" jdbcType="VARCHAR"/>
       <result property="name" column="name" jdbcType="VARCHAR"/>
       <result property="areaCode" column="area_code" jdbcType="VARCHAR"/>
       <result property="channelId" column="channel_id" jdbcType="VARCHAR"/>
   </resultMap>

   <select id="selectRobot" parameterType="com.hauto.connect.engine.dto.business.ChannalRobotDTO"
           resultMap="ChannalRobotMap">
       SELECT hce.robot_id, cic.id,hce.company_code,hce.city_code,hce.name,hce.area_code,hce.channel_id
       FROM `hauto-connect-engine`.e_channal_robot hce
       LEFT JOIN `hauto-common`.c_insurance_company cic ON cic.company_code = hce.company_code 
       WHERE city_code=#{cityCode} and cic.logic_delete = 0 and hce.query_flag = 1
   </select>

</mapper>