Memory leak when executing Doctrine query in loop

Question

I\'m having trouble in locating the cause for a memory leak in my script. I have a simple repository method which increments a \'count\' column in my entity by X amount:

Answer 1

You're wasting memory for each iteration. A much better way would be to prepare the query once and swap arguments many times. For example:

class MyEntity extends EntityRepository{
    private $updateQuery = NULL;

    public function incrementCount($id, $ammount)
    {
        if ( $this->updateQuery == NULL ){
            $this->updateQuery = $this->createQueryBuilder('e')
                ->update('MyEntity', 'e')
                ->set('e.count', 'e.count + :amount')
                ->where('e.id = :id')
                ->getQuery();
        }

        $this->updateQuery->setParameter('id', $id)
                ->setParameter('amount', $amount);
                ->execute();
    }
}

As you mentioned, you can employ batch processing here, but try this out first and see how well (if at all) performs...