Doctrine and Function YEAR() - php

Question

Hello i'm working in project with Symfony 2.4 i want to make a select using QueryBuilder but i have a exception :
FatalErrorException: Error: Call to undefined method getEntityManager()
This is my code :
$session=$this->get('session');
$id_client=$session->get('client');
$emConfig = $this->getEntityManager()->getConfiguration();
$emConfig->addCustomDatetimeFunction('YEAR', 'DoctrineExtensions\Query\Mysql\Year');
$qb = $this->createQueryBuilder('f');
$qb->select('SUM(f.montantTtc)');
$qb->from('factureBundle:Facture', 'f');
$qb->where('f.client = :id_client');
$qb->groupBy('YEAR(f.dateEdition)');
$qb->setParameter('id_client', $id_client);
$factures_by_years=$qb->getQuery()->getResult();
plz help me

Answer 1

here is the topic :
https://simukti.net/blog/2012/04/05/how-to-select-year-month-day-in-doctrine2.html
and this is the code :
<?php
// .........
// Doctrine2 repository class for entity 'Post'
// .........
public function findOneByYearMonthDay($year, $month, $day)
{
$emConfig = $this->getEntityManager()->getConfiguration();
$emConfig->addCustomDatetimeFunction('YEAR', 'DoctrineExtensions\Query\Mysql\Year');
$emConfig->addCustomDatetimeFunction('MONTH', 'DoctrineExtensions\Query\Mysql\Month');
$emConfig->addCustomDatetimeFunction('DAY', 'DoctrineExtensions\Query\Mysql\Day');
$qb = $this->createQueryBuilder('p');
$qb->select('p')
->where('YEAR(p.postDate) = :year')
->andWhere('MONTH(p.postDate) = :month')
->andWhere('DAY(p.postDate) = :day');
$qb->setParameter('year', $year)
->setParameter('month', $month)
->setParameter('day', $day);
$post = $qb->getQuery()->getSingleResult();
return $post;
}