iot-gateway/src/main/resources/mappers/iot/ProductMapper.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.zsc.edu.gateway.modules.iot.product.repo.ProductRepository">
    <resultMap id="BaseResultMap" type="com.zsc.edu.gateway.modules.iot.product.entity.Product">
        <id column="id" property="id"/>
        <result column="dept_id" property="deptId"/>
        <result column="name" property="name"/>
        <result column="type_string" property="productType"/>
        <result column="model" property="model"/>
        <result column="link" property="link"/>
        <result column="create_by" jdbcType="VARCHAR" property="createBy"/>
        <result column="update_by" jdbcType="VARCHAR" property="updateBy"/>
        <result column="create_time" jdbcType="DATE" property="createTime"/>
        <result column="update_time" jdbcType="DATE" property="updateTime"/>
        <result column="remark" jdbcType="VARCHAR" property="remark"/>
        <collection property="params" ofType="com.zsc.edu.gateway.modules.iot.tsl.entity.Param" autoMapping="true"
                    columnPrefix="param_">
            <id column="id" property="id"/>
            <result column="data_type" property="dataType"/>
            <result column="uint" property="uint"/>
            <result column="type" property="type"/>
            <result column="identifier" property="identifier"/>
            <result column="name" property="name"/>
            <result column="remark" property="remark"/>
        </collection>
    </resultMap>

    <select id="selectById" resultMap="BaseResultMap">
        select p.*,
               ip.id         as param_id,
               ip.data_type  as param_data_type,
               ip.uint       as param_uint,
               ip.type       as param_type,
               ip.identifier as param_identifier,
               ip.name       as param_name,
               ip.remark     as param_remark
        from iot_product p
                 left join iot_product_param pp on p.id = pp.product_id
                 left join iot_param ip on pp.param_id = ip.id
        where p.id = #{id}
    </select>
</mapper>