Hibernate Select Top and Bottom n Rows with Criteria

Question

Let\'s say I have two tables, Books and Reviews. Reviews has a column, stars, that can have a value between 1 and 5. A Book can have many Reviews.

How would I select al

Answer 1

Two HQL queries using org.springframework.data.domain.Pageable like:

before in the middle-layer-service you create pageable and call repo:

Pageable pageableTop = new PageRequest(0, 3, Direction.ASC, "yourFieldToSortBy");
yourRepository.findTopOrderByYourEntity(pageableTop);

Pageable pageableBottom = new PageRequest(0, 3, Direction.DESC, "yourFieldToSortBy");
yourRepository.findTopOrderByYourEntity(pageableBottom);

the repo:

public interface YourRepository extends CrudRepository {

    @Query("FROM YourEntity")
    List findTopOrderByYourEntity(Pageable pageable);
}