PHP Framework Db Error

Error messages:
  • [Type] 无法连接到数据库服务器
 
Program messages:
  • [Line: 0017]newhouse.php(class_core::_get_instance)
  • [Line: 0029]class/core.php(class_core->__construct)
  • [Line: 0056]class/core.php(class_core->_dispatch)
  • [Line: 0428]class/core.php(loupan___model->get_newhouse_dir)
  • [Line: 0081]application/data/model/loupan.php(loupan___model->get_loupan)
  • [Line: 0107]application/data/model/loupan.php(db::isobject)
  • [Line: 0730]class/core.php(db::_object)
  • [Line: 0760]class/core.php(db_mysql->connect)
  • [Line: 0570]class/core.php(db_mysql->_dbconnect)