With the code:
$qb = $entityManager->createQueryBuilder();
$qb->select('cat')->from('BuyAndSellSiteBundle:Category ', 'cat');
$qb->getQuery();
$a =$qb->getResult();
I get an exception:
FatalErrorException: Error: Call to undefined method Doctrine\ORM\QueryBuilder::getResult() in C:\xampp\htdocs\buySell\src\BuyAndSell\SiteBundle\Controller\DefaultController.php line
This makes sense. Because QueryBuilder does not change itself, you need to store result of getQuery() invocation :
$queryBuilder = $entityManager->createQueryBuilder();
$queryBuilder->select('cat')->from('BuyAndSellSiteBundle:Category ', 'cat');
// get the Query from the QueryBuilder here ...
$query = $qb->getQuery();
// ... then call getResult() on the Query (not on the QueryBuilder)
$result = $query->getResult();
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