php - How to use andWhere and orWhere in Doctrine?

Question

WHERE a = 1 AND (b = 1 Or b = 2) AND (c = 1 OR c = 2)

How can i make this in Doctrine?

$q->where("a = 1");
$q->andWhere("b = 1")
$q->orWhere("b = 2")
$q->andWhere("c = 1")
$q->orWhere("d = 2")

this isnt correctly... Should be:

$q->where("a = 1");
$q->andWhere("b = 1")
   $q->orWhere("b = 2")
$q->andWhere("c = 1")
   $q->orWhere("d = 2")

but how can i make it? In Propel is function getNewCriterion, and in Doctrine...?

Answer 1

$q->where("a = 1")
  ->andWhere("b = 1 OR b = 2")
  ->andWhere("c = 2 OR c = 2")
  ;