backend_code/target/classes/mapper/template/SystemUserMapper.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.template.mapper.SmartUserMapper">
    <resultMap type="com.template.model.vo.AffiliateUserVo" id="affiliateUserMap">
        <result property="id" column="id"/>
        <result property="name" column="name"/>
        <result property="cardNo" column="card_no"/>
    </resultMap>

    <select id="queryAffiliateUserById" resultType="com.template.model.vo.AffiliateUserVo" resultMap="affiliateUserMap">
        select id,name,card_no from smart_user
        where find_in_set(id,(select affiliate from smart_user where
        deleted = 0
        <if test="id != null and id != ''">
            and id = #{id}
        </if>
        )) and deleted = 0
    </select>
</mapper>