ruoyi-system/src/main/resources/mapper/system/SysUserFollowMapper.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.ruoyi.system.mapper.SysUserFollowMapper">
    <resultMap id="SysUserFollowMap" type="com.ruoyi.system.domain.SysUserFollow">
        <id property="followId" column="follow_id"/>
        <result property="userId" column="user_id"/>
        <result property="authorId" column="author_id"/>
        <result property="createTime" column="create_time"/>
    </resultMap>

    <insert id="insertFollow" parameterType="com.ruoyi.system.domain.SysUserFollow">
        insert into sys_user_follow (user_id, author_id, create_time)
        values (#{userId}, #{authorId}, sysdate())
    </insert>

    <delete id="deleteFollow">
        delete from sys_user_follow where user_id = #{userId} and author_id = #{authorId}
    </delete>

    <select id="selectFollowListByUserId" resultMap="SysUserFollowMap">
        select follow_id, user_id, author_id, create_time
        from sys_user_follow
        where user_id = #{userId}
    </select>

    <select id="selectFollow" resultMap="SysUserFollowMap">
        select follow_id, user_id, author_id, create_time
        from sys_user_follow
        where user_id = #{userId} and author_id = #{authorId}
    </select>

    <select id="selectUserIdByUsername" resultType="java.lang.Long">
        select user_id
        from sys_user
        where user_name = #{username}
    </select>
</mapper>