Spring Data JPA inheritance in repositories

Question

I have an abstract class annotated with @MappedSuperClass. There are around 15 entities that extend this abstract class (having 15 corresponding tables in the d

Answer 1

You will have to create repository for each class. However you can keep your methods in the abstract. You'll need to provide @Query on each of the methods and use SpeL(Spring Expression Language) to add the type to the queries.

@NoRepositoryBean
public interface AbstractRepository 
        extends CrudRepository{

 @Query("select e from #{#entityName} as e from equipment where e.name = equipmentName")
 T findEquipmentByName(String equipmentName);

}

Then extend like the following

@Transactional
public interface SpecialEquipmentRepo extends AbstractRepository{

}