ORDER BY in Criteria API for a computed column name (by alias)

Question

Having a situation where my java code is symbolic to query -

  SELECT CUSTOMER_ID,
         CUSTOMER_NAME,
         CASE
             WHEN COUNT (DISTINCT CARD_ID         


        

Answer 1

It seems this is not possible with the JPA Criteria API and you will have to fallback to using JPQL/HQL instead.

Answer 2

Using the Criteria API, you need to order by the caseSelect expression. I gave it a try and it works fine with Hibernate 5.4. Which version do you use?

Answer 3

This is fairly not possible and just feels like a case missed by JPA. Though if using hibernate API it is possible. But, my workaround was -

1. Created a view which would contain the case expression.
2. Join the view with my entity (you cannot do a join, but one more query.from(View.class)).
3. In the where add the ids of View and the entity.

Now in the order by you could mention the column name by View.column_name.

Answer 4

I faced a similar situation...

query.multiselect(root, computedColumn);
query.orderBy(new Order[]{filterDTO.getSortAsc() ? cb.asc(cb.literal(2)) : cb.desc(cb.literal(2))});

I my case computedColumn is Subquery...I did not manage to make it work by column alias but it seems to work by column index returned in the tupple so I guess in your code it should work by index 1

query.orderBy(cb.asc(cb.literal(1)));