thincontrollers1.php

<?php
/** @Entity */
class Bug
{
    /** @Column(type="integer") */
    private $id;
    /** @Column(length=50) */
    private $status;
    //...
}

thincontrollers2.php

<?php
// $em instanceof Doctrine\ORM\EntityManager
$fixedbugs = $em->getRepository('Bug')
    ->findBy(array('status' => 'fixed'));

thincontrollers3.php

<?php
$fixedbugs = $em
    ->createQuery("SELECT b FROM Bug b WHERE b.status = 'fixed'")
    ->getResult();

thincontrollers4.php

<?php
/**
 * @Entity(repositoryClass="BugRepository")
 */
class Bug
{ /* ... */ }

class BugRepository extends EntityRepository
{
    public function findAllFixedBugs()
    {
        return $this->_em
            ->createQuery("SELECT b FROM Bug b WHERE b.status = 'fixed'")
            ->getResult();
    }
}

thincontrollers5.php

<?php
$fixedbugs = $em->getRepository('Bug')->findAllFixedBugs();