public function myManager(){
$isDevMode = true;
$config = Setup::createAnnotationMetadataConfiguration(array(__DIR__."/AppBundle/Entity"), $isDevMode);

// database configuration parameters
        $conn = array(
            'dbname' => 'teste',
            'user' => 'root',
            'password' => '',
            'host' => '127.0.0.1',
            'driver' => 'pdo_mysql',
        );

$entityManager = EntityManager::create($conn, $config);
return $entityManager;
}

public function testAction(){
    $em = $this->myManager()->getRepository('Product');
    return $this->render('toto.html.twig');
}