优化--用户聊天小心按照降序排列

csm-service/cms-service-user/src/main/resources/mapper/MessageDao.xml

@@ -41,8 +41,7 @@
         where is_deleted = 0
     </select>
     <select id="selectUserMessage" resultType="com.mmc.iuav.user.entity.UserMessageDO">
-        SELECT id, img_url, content, sender_user_id, receiver_user_id, create_time, back_user_id
-        FROM (SELECT id, img_url, content, sender_user_id, receiver_user_id, create_time, back_user_id
+SELECT id, img_url, content, sender_user_id, receiver_user_id, create_time, back_user_id
               FROM user_message
               where is_deleted = 0
                 and sender_user_id in (#{senderUserId}, #{messageQO.receiverUserId})
@@ -52,9 +51,10 @@
                 when #{messageQO.backUserId} is not null then back_user_id = #{messageQO.backUserId}
                   else back_user_id is null
                 end
+ORDER BY create_time desc
                   LIMIT #{messageQO.pageNo}
-                  , #{messageQO.pageSize}) AS subquery
-        ORDER BY create_time ASC;
+                  , #{messageQO.pageSize}
+
     </select>
     <select id="countUserMessage" resultType="java.lang.Integer">
         select count(*)