How to call an Oracle function from Hibernate with a return parameter?

Question

My question is very much like Getting the return value of a PL/SQL function via Hibernate

I have a function which does some modifications internally and it returns a

Answer 1

I wrote an article about various ways of calling Oracle stored procedures and functions from Hibernate so, to summarize it, you have the following options:

1. With a @NamedNativeQuery:

   @org.hibernate.annotations.NamedNativeQuery(
       name = "fn_my_func",
       query = "{ ? = call MYSCHEMA.MYFUNC(?, ?) }",
       callable = true,
       resultClass = Integer.class
   )
   
   Integer result = (Integer) entityManager.createNamedQuery("fn_my_func")
       .setParameter(1, 1)
       .setParameter(2, 1)
       .getSingleResult();    
   

2. With JDBC API:

   Session session = entityManager.unwrap( Session.class );
   
   final AtomicReference result = 
       new AtomicReference<>();
   
   session.doWork( connection -> {
       try (CallableStatement function = connection
               .prepareCall(
                   "{ ? = call MYSCHEMA.MYFUNC(?, ?) }"
               )
           ) {
           function.registerOutParameter( 1, Types.INTEGER );
           function.setInt( 2, 1 );
           function.setInt( 3, 1 );
           function.execute();
           result.set( function.getInt( 1 ) );
       }
   } );            
   

3. With a native Oracle query:

   Integer result = (Integer) entityManager.createNativeQuery(
       "SELECT MYSCHEMA.MYFUNC(:postId, :transId) FROM DUAL")
       .setParameter("postId", 1)
       .setParameter("transId", 1)
       .getSingleResult();