Warning: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php on line 27

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known' in /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php:27 Stack trace: #0 /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php(27): PDO->__construct('mysql:host=qcw-...', 'votes10yancomcn', 'votes10yancomcn...') #1 /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php(14): dbconn->getPdo() #2 /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php(21): dbconn->__construct() #3 /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php(45): dbconn::getInstance() #4 /www/wwwroot/voteslehooocn/2020fangyi/gdph.php(15): Dbo->__construct() #5 {main} thrown in /www/wwwroot/voteslehooocn/2020fangyi/global/class.db.php on line 27