Doctrine\DBAL\Query\QueryBuilder::addOrderBy PHP Method

    public function addOrderBy($sort, $order = null)
    {
        return $this->add('orderBy', $sort . ' ' . (!$order ? 'ASC' : $order), true);
    }

 /**
  * @internal
  */
 private function incorporateDbalQueryBuilder(QueryBuilder $qb, FilterInterface $filter)
 {
     $criteria = $this->getFilteringCriteria($filter);
     // extraindo os rootAliases, pois o DBAL\QueryBuilder não tem
     $fromPart = $qb->getQueryPart('from');
     $rootAliases = array();
     foreach ($fromPart as $part) {
         $rootAliases[] = $part['alias'];
     }
     $visitor = new DbalQueryExpressionVisitor($qb->getConnection(), $rootAliases, $this->fieldMap);
     if ($whereExpression = $criteria->getWhereExpression()) {
         $qb->andWhere($visitor->dispatch($whereExpression));
         $qb->setParameters($visitor->getParameters());
     }
     if ($criteria->getOrderings()) {
         foreach ($criteria->getOrderings() as $sort => $order) {
             $qb->addOrderBy($visitor->getFieldName($sort), $order);
         }
     }
     if (($firstResult = $criteria->getFirstResult()) !== null) {
         $qb->setFirstResult($firstResult);
     }
     if (($maxResults = $criteria->getMaxResults()) !== null) {
         $qb->setMaxResults($maxResults);
     }
 }