How to do a LIKE database query in Symfony2

Question

This should be simple but I can't find a working example. Here's a controller method that throws the error "Invalid parameter number: number of bound variables does not match number of tokens". I'm posting the "searchterm" variable successfully but can't get the query to work. What is missing? Thanks!

 public function searchAction()
{
    $request = $this->getRequest();

    $searchterm = $request->get('searchterm');

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

    $query = $em->createQuery("SELECT n FROM AcmeNodeBundle:Node n WHERE n.title LIKE '% :searchterm %'")
             ->setParameter('searchterm', $searchterm);

    $entities = $query->getResult();

    return array('entities' => $entities);

}

Answer 1

Working example from my Symfony2 project:

$qb = $this->createQueryBuilder('u');
$qb->where(
         $qb->expr()->like('u.username', ':user')
     )
     ->setParameter('user','%Andre%')
     ->getQuery()
     ->getResult();