dqvtm82066 2015-04-19 16:33 采纳率: 0%
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在Symfony2中捕获数据库异常

I've got a random problem that I can't narrow down. Occasionally, I will get the following error in a Symfony2 application:

Uncaught Exception: An exception occured in driver: SQLSTATE[08004] [1040] Too many connections {"type":1,"file":"/var/www/symfony/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php","line":115,"level":30709

I would like to setup an application-wide listener to catch the PDOException and log some information. How can I hook into Symfony to only catch PDOException?

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  • duanfen2349 2015-04-19 18:46
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    You need to create custom exception listener. It will listen to all exceptions, but you will specify type check inside it.

    In your services.yml you need to specify listener:

    kernel.listener.your_pdo_listener:
            class: Acme\AppBundle\EventListener\YourExceptionListener
            tags:
               - { name: kernel.event_listener, event: kernel.exception, method: onPdoException }
    

    Now you need to create this class:

    YourExceptionListener:

    use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
    class YourExceptionListener
    {
         public function onPdoException(GetResponseForExceptionEvent $event)
         {
              $exception = $event->getException();
    
              if ($exception instanceof PDOException) {
                  //now you can do whatever you want with this exception
              }
         }
    }
    

    Check doc how to create event listener

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