How to select discriminator column in doctrine 2

Question

I need some help when select only discriminator column from doctrine 2 when run the DQL below

SELECT p.type FROM AppBundle\\Entity\\Product p

Answer 1

You should be able to do this with a scalar result with INSTANCE OF and a case, when, (else,) end clause:

SELECT
  (case
     when p INSTANCE OF AppBundle\Entity\Product then \'0\'
     when p INSTANCE OF AppBundle\Entity\Product\SingleIssue then \'1\'
     when p INSTANCE OF AppBundle\Entity\Product\CountBasedIssue then \'2\'
     when p INSTANCE OF AppBundle\Entity\Product\TimeBasedIssue then \'3\'
     else \'foobar\'
   end) as type
FROM
  AppBundle\Entity\Product p

Of course the disadvantage is you have to update the query every time you add a DiscriminatorMap entry.