当你看到下面的错误提示，一般来说是数据库连接异常。
其中有可能是数据库没有启动，防火墙问题。[code]Error: Database connection failed
It is possible that the database is overloaded or otherwise not running properly.
The site administrator should also check that the database details have been correctly specified in config.php[/code]
本错误，请检查数据库的连接。