4S/target/classes/mapper/EngTowerNewestMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zhgd.scs.mapper.EngTowerNewestMapper">

    <select id="getNewestByCode" resultType="com.zhgd.scs.domain.vo.EngTowerNewestVo">
        SELECT etn.*,
               etb.phone,
               etb.unit_name,
               etb.driver_name,
               etb.person_id,
               etb.unit_name,
               etb.unit_id,
               etb.id_card
        FROM eng_tower_base etb
                 LEFT JOIN eng_tower_newest etn ON etb.device_sn = etn.device_sn
        WHERE etb.project_id = #{projectId}
          AND etb.device_sn = #{code}
    </select>
</mapper>