SpringDataJPA: custom data mapping with Native Query

Question

public interface UserRepository extends JpaRepository {

  @Query(value = \"SELECT * FROM USERS WHERE EMAIL_ADDRESS = ?0\", nativeQuery = true)
  User          


        

Answer 1

What about interface based projection?

Basically you write interface with getters that correspond to SQL query parameters.

In this way you even don't need to force @Id parameter on projection:

@Entity
public class Book {
     @Id
     private Long id;
     private String title;
     private LocalDate published;
}

public interface BookReportItem {
     int getYear();
     int getMonth();
     long getCount();
}

public interface BookRepository extends Repository {
     @Query(value = "select " +
                    "  year(b.published) as year," +
                    "  month(b.published) as month," +
                    "  count(b) as count," +
                    " from Book b" +
                    " group by year(b.published), month(b.published)")
     List getPerMonthReport();
}

It uses org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap underneath as proxy for interface in current Spring implementation.

It works for nativeQuery = true too.