Spring Data JPA - JPQL Update query?

Question

Spring

I have a specific exercise as part of my homework in class at the university. This entity structure looks like this:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class Parent {
...some fields...
}

@Entity
public class ChildA extends Parent {
...
}

@Entity
public class ChildB extends Parent {
...
}

I need to implement the JpaRepository method on ParentRepository or rather JPQL Query to perform an update operation on the table given in Class<? expands the Parent> parameter. It's just that the method should update some field, but only in the subclass given as a parameter.

The structure of the method should be:

public interface ParentRepository extends JpaRepository<Parent, Integer> {

    void updateInBulk(Class<? extends Parent> clazz, int someParameter);
}

I came up with something like this but it didn't work.

public interface ParentRepository extends JpaRepository<Parent, Integer> {

    @Modifying
    @Query("update :entity e set e.some_field = 'T' where e.other_field > :some_param")
    void updateInBulk(@Param("entity") Class<? extends Parent> clazz, @Param("some_param") int someParam);
}

It was just my blind shot, but I couldn't find any material that explains how to do this kind of thing.
Does anyone have any suggestions how to solve this problem?

Answer 1

Is it possible to specify the table name as a parameter?
As far as I know, this is only allowed for table fields.