CdvPHP Framework Db Error

Error messages:
  • [Type] 无法连接到数据库服务器
 
Program messages:
  • [Line: 0017]/home/dahai/webapps/lijing/index.php(class_core::_get_instance)
  • [Line: 0034]class/core.php(class_core->__construct)
  • [Line: 0058]class/core.php(class_core->_dispatch)
  • [Line: 0298]class/core.php(main->downloads_action)
  • [Line: 0495]control/main.php(main___model->downloads_data)
  • [Line: 0253]data/model/main.php(db::isobject)
  • [Line: 0563]class/core.php(db::_object)
  • [Line: 0593]class/core.php(db_mysql->connect)
  • [Line: 0403]class/core.php(db_mysql->_dbconnect)