Retrieve object with nativeQuery in Symfony2 - symfony

Question

I want retrieve an object with native query in Symfony 2
my code is:
$rsm = new ResultSetMapping($this->getEntityManager());
$rsm->addEntityResult('SNUserBundle:User', 'u');
$rsm->addFieldResult('u', 'nickname', 'nickname');
$query = $this->getEntityManager()->createNativeQuery('SELECT u.nickname FROM u WHERE u.nickname = ?', $rsm);
$query->setParameter(1, 'barno7');
$users = $query->getResult();
I have this error
An exception occurred while executing 'SELECT u.nickname FROM u WHERE u.nickname = ?' with params ["barno7"]:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'sn.u' doesn't exist
my table name sn_user and in my entity SNUserBundle:User have this annotation
* #ORM\Table(name="sn_user")
i try also
$query = $this->getEntityManager()->createNativeQuery('SELECT u.nickname FROM user WHERE u.nickname = ?', $rsm);
and my error is
An exception occurred while executing 'SELECT u.nickname FROM users WHERE u.nickname = ?' with params ["barno7"]:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'sn.user' doesn't exist
my real table is sn_user

Answer 1

I think you are mixing up SQL and DQL, or the functions that use each. It looks like you want to use DQL to query, which will return an object. In that case, you don't use the createNativeQuery method. This method if for SQL.
See the Symfony docs on DQL for an example of how to query with DQL. Here is the example snippet from the docs:
$em = $this->getDoctrine()->getManager();
$query = $em->createQuery(
'SELECT p
FROM AcmeStoreBundle:Product p
WHERE p.price > :price
ORDER BY p.price ASC'
)->setParameter('price', '19.99');
$products = $query->getResult();
follow this syntax, and you should be fine.

Answer 2

I resolve like this
$rsm = new ResultSetMapping;
$rsm->addEntityResult('SNUserBundle:User', 'u');
$rsm->addFieldResult('u', 'id', 'id');
$rsm->addFieldResult('u', 'n', 'nickname');
$query = $this->getEntityManager()->createNativeQuery('
SELECT u.id ,u.nickname as n FROM sn_user u WHERE u.nickname LIKE = ?', $rsm);
$query->setParameter(1, 'barno7');
$users = $query->execute();
return $users;