Fatal error: Uncaught PDOException: SQLSTATE[HY000] [1040] Too many connections in D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php:43 Stack trace: #0 D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php(43): PDO->__construct('mysql:host=127....', 'gdgkzs_hszk_edu', 'gdgkzs_hszk_edu', Array) #1 D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOMySql\Driver.php(44): Doctrine\DBAL\Driver\PDOConnection->__construct('mysql:host=127....', 'gdgkzs_hszk_edu', 'gdgkzs_hszk_edu', Array) #2 D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, 'gdgkzs_hszk_edu', 'gdgkzs_hszk_edu', Array) #3 D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Connection.php(429): Doctrine\DBAL\Connection->connect() #4 D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Connection. in D:\wwwroot\webs\gdgkzs.hszk-edu.cn\vendor2\doctrine\dbal\lib\Doctrine\DBAL\Driver\AbstractMySQLDriver.php on line 115