ucenter home 无法显示

大家好，我在本地调试好之后，上传至虚拟主机提示这样的问题：


MySQL Error
Message: MySQL Query Error
SQL: SELECT main.*, field.* FROM uchome_blog main LEFT JOIN uchome_blogfield field ON field.blogid=main.blogid WHERE 1 AND main.dateline>='1304474466' AND main.friend='0' ORDER BY main.dateline desc LIMIT 0,6
Error: No database selected
Errno.: 1046
Click here to seek help.


谢谢大家乐