Symfony2在Doctrine2中使用querybuilder加入查询

Question

Could somebody convert this query for me in querybuilder?

SELECT m.id,n.unitid 
  FROM mappaths m JOIN unitids n on (m.id=n.id) where n.databaseid=1

I am using this query but it gives me all the values of mm.unitid , while my requirement is to get only one value that is defined by test=1 variable

    $query=$qb->select('mm.unitid')
      ->from('ApiMapBundle:Mappaths','m')
      ->from('ApiMapBundle:Unitids','mm')
     // ->leftJoin('m','u')
       ->leftJoin('m.refUnitids1','u','WITH','m.id = u')
     //  ->leftJoin('m.refUnitids2','v')   
      ->where('m.id=:test')
      ->setParameter('test',1)
      ->getQuery()->getResult();

Answer 1

Try following:

$query = $qb->select('mm.unitid')
      ->from('ApiMapBundle:Mappaths','m')
      ->innerJoin('m.refUnitids1','mm','WITH','m.id = mm.FIELD') //you need to specify on which field of mm join should be done
      ->where('m.id=:test')
      ->setParameter('test',1)
      ->getQuery()
      ->getResult();

You need to specify field of Unitids which should be used to join to Mappaths . The best way would be to define this relation in Entity definition, then you can use just ->innerJoin('m.refUnitids1','mm') without additional join parameters.

Also, in this case, it is better to use innerJoin instead of leftJoin