织梦上传服务器后出现数据连接失败是怎么回事如何解决

//数据库连接信息
$cfg_dbhost = 'localhost';
$cfg_dbname = 'dedecmsv57utf8sp1';
$cfg_dbuser = 'root';
$cfg_dbpwd = '123456';
$cfg_dbprefix = 'dede_';
$cfg_db_language = 'utf8';