哪位朋友帮帮小弟,急救

所有全部架设好了，出现这样的错误
Discuz! info: MySQL Query Error

Time: 2006-10-10 10:19am
Script: /index.php

SQL: SELECT type FROM cdb_usergroups WHERE groupid='7'
Error: No database selected
Errno.: 1046

Similar error report has beed dispatched to administrator before.
打开install.php后点了同意后就出现网页无法显示了
我的是本地架设，急``