PHP Framework Db Error

Error messages:
  • [Type] 无法连接到数据库服务器
 
Program messages:
  • [Line: 0013]index.php(class_core::_get_instance)
  • [Line: 0029]class/core.php(class_core->__construct)
  • [Line: 0056]class/core.php(class_core->_dispatch)
  • [Line: 0463]class/core.php(news->view_action)
  • [Line: 0086]application/control/news.php(news___model->newsinfo)
  • [Line: 0096]application/data/model/news.php(db::isobject)
  • [Line: 0728]class/core.php(db::_object)
  • [Line: 0758]class/core.php(db_mysql->connect)
  • [Line: 0568]class/core.php(db_mysql->_dbconnect)