我正在努力学习laravel 5.我正在关注laracast教程，但我遇到了一个问题。当我使用php artisan migrate命令时，我得到像这样的错误
exception 'PDOException' with message 'SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' in /opt/lampp/htdocs/first-project/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:47