完成用户封禁，解封，封禁查询（由于没有管理员，所以现在先用普通用户测试封禁）

src/main/resources/com/bao/dating/mapper/UserBanMapper.xml

@@ -0,0 +1,50 @@
+<?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.bao.dating.mapper.UserBanMapper">
+
+    <!--  向数据库中添加用户封禁信息 -->
+    <insert id="insertBan" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO user_ban
+            (user_id, reason, ban_start_time, ban_end_time, status)
+        VALUES
+            (#{userId}, #{reason}, #{banStartTime}, #{banEndTime}, #{status})
+    </insert>
+
+    <!--  查询指定用户是否存在未过期的封禁信息 -->
+    <select id="existsActiveBan" resultType="int">
+        SELECT COUNT(1)
+        FROM user_ban
+        WHERE user_id = #{userId}
+          AND status = 1
+        LIMIT 1
+    </select>
+
+    <!--   查询指定用户是否存在未过期的封禁信息 -->
+    <select id="selectActiveBan" resultType="com.bao.dating.pojo.entity.UserBan">
+        SELECT *
+        FROM user_ban
+        WHERE user_id = #{userId}
+          AND status = 1
+        LIMIT 1
+    </select>
+
+     <!--   解封指定用户 -->
+    <update id="unbanUser">
+        UPDATE user_ban
+        SET status = 0
+        WHERE user_id = #{userId}
+          AND status = 1
+    </update>
+
+     <!--   批量更新已过期的封禁信息 -->
+    <update id="updateExpiredBans">
+        UPDATE user_ban
+        SET status = 0
+        WHERE status = 1
+          AND ban_end_time IS NOT NULL
+          AND ban_end_time &lt; NOW()
+    </update>
+
+</mapper>