Dúvida de Vinicius Feitosa: [Doctrine ORM 2.+]

DoctrinePostgresql.php

$em->getConfiguration()->setMetadataDriverImpl(
    new \Doctrine\ORM\Mapping\Driver\DatabaseDriver(
        $em->getConnection()->getSchemaManager()
    )
);
$cmf = new Doctrine\ORM\Tools\DisconnectedClassMetadataFactory();
$cmf->setEntityManager($em);
$metadata = $cmf->getAllMetadata();

$cme = new \Doctrine\ORM\Tools\Export\ClassMetadataExporter();

$entityGenerator = new \Doctrine\ORM\Tools\EntityGenerator();
$entityGenerator->setAnnotationPrefix("");
$exporter = $cme->getExporter('annotation',  __DIR__ . '/entities');
$exporter->setEntityGenerator($entityGenerator);
$exporter->setMetadata($metadata);
$etg = new \Doctrine\ORM\Tools\EntityGenerator;
$exporter->setEntityGenerator($etg);
$exporter->export();