$query = $this->getEntityManager()
        ->createQuery('SELECT adsLink
                           FROM CatalogBundle:AdsLink adsLink
                           JOIN CatalogBundle:Product product
                           WHERE product.user = :user')
        ->setParameter('user', $user);

    return $query->getResult();

SELECT product_advertising_link.*, products.name, products.user_id
FROM product_advertising_link
JOIN products ON product_advertising_link.product_id = products.id
WHERE products.user_id = 1