数据库缺失，帮帮我吧！

数据库缺失，帮帮我吧！

数据库升级了这两条命令：
DROP TABLE cdb_posts

DROP TABLE cdb_members

就出现下面的情况：

Discuz! info: MySQL Query Error

Time: 2006-8-21 5:32am
Script: /index.php

SQL: SELECT s.sid, s.styleid, s.groupid='6' AS ipbanned, s.pageviews AS spageviews, s.lastolupdate, s.seccode, m.uid AS discuz_uid,
m.username AS discuz_user, m.password AS discuz_pw, m.secques AS discuz_secques, m.adminid, m.groupid, m.groupexpiry,
m.extgroupids, m.email, m.timeoffset, m.tpp, m.ppp, m.posts, m.digestposts, m.oltime, m.pageviews, m.credits, m.extcredits1, m.extcredits2, m.extcredits3,
m.extcredits4, m.extcredits5, m.extcredits6, m.extcredits7, m.extcredits8, m.timeformat, m.dateformat, m.pmsound,
m.sigstatus, m.invisible, m.lastvisit, m.lastactivity, m.lastpost, m.newpm, m.accessmasks
FROM cdb_sessions s, cdb_members m
WHERE m.uid=s.uid AND s.sid='xddWrH' AND CONCAT_WS('.',s.ip1,s.ip2,s.ip3,s.ip4)='218.80.212.182' AND m.uid='1'
AND m.password='5d7ccb5efa141b6a5374b4ee1b1aa093' AND m.secques='8af83204'
Error: Table 'gbcn_vxv_cn.cdb_members' doesn't exist
数据表缺失,请恢复备份数据

Similar error report has beed dispatched to administrator before.

惨重……有没有备份啊？