feat(UserFollow):添加作者关注（好友）功能，可以对其它用户进行关注或取关，可以查询自己的关注列表和粉丝列表
Change-Id: Ibbab1104a9a605ac2e8b937693e5e8065d607a3d
diff --git a/ruoyi-system/src/main/resources/mapper/system/SysUserFollowMapper.xml b/ruoyi-system/src/main/resources/mapper/system/SysUserFollowMapper.xml
new file mode 100644
index 0000000..6fb9169
--- /dev/null
+++ b/ruoyi-system/src/main/resources/mapper/system/SysUserFollowMapper.xml
@@ -0,0 +1,31 @@
+<?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>
+</mapper>
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