discuz清空短消息数据库 MYSQL 代码

论坛时间运营长了，给数据库瘦身，清空短消息是个不错的选择。
具体方法：
1、登录mysql
2、分别输入下面的语句
3、完成

DELETE FROM `pre_ucenter_pm_lists` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_members` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_0` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_1` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_2` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_3` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_4` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_5` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_6` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_7` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_8` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_9` WHERE 1 ;