add

qiaoba-modules/qiaoba-module-system/src/main/resources/mapper/SysUserPostMapper.xml

@@ -7,4 +7,16 @@
     <select id="selectPostIdsByUserId" resultType="string">
         select post_id from sys_user_post where user_id = #{userId}
     </select>
+
+    <select id="selectUsedPostNameByIds" resultType="string">
+        select DISTINCT t1.post_name
+        from sys_post t1
+        LEFT JOIN sys_user_post t2
+        on t1.post_id = t2.post_id
+        where t2.post_id in
+        <foreach collection="list" item="postId" open="(" separator="," close=")">
+            #{postId}
+        </foreach>
+    </select>
+
 </mapper>