在Symfony 2中访问侦听器中的数据库

Question

我们需要在侦听器中访问数据库信息.我们在service.yml中配置监听器.监听器如下:

namespace company\MyBundle\Listener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class RequestListener
{
    protected $container;

public function __construct(ContainerInterface $container)
{
    $this->container = $container;
}

public function onKernelRequest(GetResponseEvent $event)
{
...

我们如何在onKernelRequest函数中访问doctrine？

我试图从控制器扩展并做:

        $em = $this->getDoctrine()->getEntityManager(); 

它有效,但我认为这是一个不好的做法.

Answer 1

您可以注入服务容器.首先更改构造函数以获取EntityManager:

use Doctrine\ORM\EntityManager;

class RequestListener {
    protected $em;
    function __construct(EntityManager $em)
    {
        $this->em = $em;
    }
    //...
}

然后配置您的服务:

#...
services:
    foo.requestlistener:
        class: %foo.requestlistener.class%
        arguments:
            - @doctrine.orm.entity_manager