symfony 3.4 Doctrine COUNT - symfony

Question

this code works well to count how many "2014-01-01 00:00:00" there is in my column "session" but I want the day to be anything not only 01.
class BooknowRepository extends \Doctrine\ORM\EntityRepository
{
public function findAllOrderedByNb() {
return $this->createQueryBuilder('a')
->select('COUNT(a)')
->where('a.session = :session')
->setParameter('session', '2014-01-01 00:00:00')
->getQuery()
->getSingleScalarResult();
}
}

Answer 1

class BooknowRepository extends \Doctrine\ORM\EntityRepository
{
public function findAllOrderedByNb() {
return $this->createQueryBuilder('a')
->select('COUNT(a)')
->where('a.session LIKE :session')
->setParameter('session', '%2014-01%')
->getQuery()
->getSingleScalarResult()
;
}
}

Answer 2

Several dates
but I want the day to be anything not only 01
If I have understood you correctly, your want find count of dates from array. In SQL this is implemented using WHERE IN syntax — in Doctrine you are greatly encouraged to use $qb->expr()->in() method.
$sessions = ['2014-01-01 00:00:00', '2014-01-03 00:00:00'];
...
$qb = $this->createQueryBuilder('a');
...
$qb->select('COUNT(a)')
->where($qb->expr()->in('a.session', ':sessions'))
->setParameter('sessions', sessions)
Dotrine doc: https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/query-builder.html#high-level-api-methods
Date range
If you want to get count of rows in month/year you need set a interval until the start of the next month
->andWhere('a.session >= :startSession')
->andWhere('a.session < :finishSession')
->setParameter('startSession', '2014-01-01 00:00:00')
->setParameter('finishSession', '2014-02-01 00:00:00')