hibernate hql sum case when then else end execution in java problem

Question

I need to execute a HQL query with sum when then else end clause in Java that run with no problem in postgres :

SELECT r.reviewer_id,
  sum(case when c.service_type = 'مالتی مدیا' AND c.genre_id = '66c92962-324c-11e7-93ae-92361f002671' then 1 else 0 end) image_multimedia,
  sum(case when c.service_type is null AND c.genre_id = '66c92b1a-324c-11e7-93ae-92361f002671' then 1 else 0 end) image_null

 FROM module_samim.content c
  Join module_samim.content_reviewer r on c.id = r.content_id
  Join module_samim.file f on f.id = c.file_id
  Group by r.reviewer_id

I tried to run it with createQuery() but I get :

Sep 11, 2018 8:57:20 AM org.hibernate.hql.internal.ast.ErrorCounter reportError
ERROR: line 1:58: expecting "then", found 'مدیاAND'
line 1:58: expecting "then", found 'مدیاAND'
and

Sep 11, 2018 8:57:20 AM org.hibernate.hql.internal.ast.ErrorCounter reportError
ERROR: line 1:264: unexpected token: image_null
Sep 11, 2018 8:57:20 AM org.hibernate.hql.internal.ast.ErrorCounter reportError
ERROR: line 1:264: unexpected token: image_null
line 1:264: unexpected token: image_null

please help me! thank you!

Answer 1

I found the solution :)) I used createNativeQuery() and @SqlResultSetMapping explained in this link to solve my problem completely

Answer 2

The syntax seems to be a SQL, not HQL.

Therefore, we need instead of this

createQuery()

to call that

createSqlQuery()

Answer 3

It seems that you are mixing the usage of native query over HQL/JPQL createQuery API

Just to clarify it for you, there are three different ways we can create a SQL query in Hibernate:

   1) session.createQuery()             //Hibernate APi
   2) entityManager.createQuery()       //JPA Api

   3) session.createSQLQuery()          // **** Hibernate API ****
   4) entityManager.createNativeQuery() //JPA API

• So if you are using Hibernate, you should user session.createSQLQuery() and if you are using JPA you should use entityManager.createNativeQuery()