$repGroup = $this->getDoctrine()->getRepository('AppBundle:Group');
 $group = $repGroup->findAll();

/**
 * @ORMEntity
 * @ORMTable(name="Group")
 */
class Group
{
/**
 * @ORMId
 * @ORMColumn(type="integer")
 * @ORMGeneratedValue(strategy="AUTO")
 */
private $id;

/**
 * @ORMColumn(type="string", length=100, nullable=false)
 */
private $name;

/**
 * @ORMColumn(type="text", length=255, nullable=true)
 */
private $description;