backend_code/target/classes/mapper/template/SmartAuthorGroupMapper.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.SmartAuthorGroupMapper">
    <resultMap type="com.template.model.pojo.SmartAuthorGroup" id="smartAuthorGroupMap">
        <result property="id" column="id"/>
        <result property="parentId" column="parent_id"/>
        <result property="name" column="name"/>
        <result property="userId" column="user_id"/>
        <result property="applyId" column="apply_id"/>
    </resultMap>
    <select id="smartAuthorGroup" resultType="com.template.model.pojo.SmartAuthorGroup" resultMap="smartAuthorGroupMap">
        SELECT * FROM `smart_author_group`
        where deleted = 0
        <if test="userId != null and userId != ''">
            and FIND_IN_SET(userId,user_id)
        </if>
    </select>
</mapper>