Leonardo :
I want to make a complex query and map the result into a DTO. The DTO is below:
@Value(staticConstructor = "of")
public class TotalsDto {
LocalDate date;
long totals;
long totalPerCategory;
int categoryId;
String categoryName;
}
My repository interface is extending from JpaRepository. This is throwing an IllegalArgumentException: Not a managed type, because TotalsDto is not an Entity itself.
The repository is:
@Repository
public interface TotalsRepository extends JpaRepository<TotalsDto, Integer> {
@Query(value = "SELECT ...", nativeQuery = true)
List<TotalsDto> getTotals(params...);
}
The query is getting data from other entities to build the DTO. Any way to map every column to DTO? I tried to map it with the query below but it still getting Not a managed class.
SELECT my.package.TotalsDto.of(column1, subqueryResult1, subqueryResult2...)
Maciej Kowalski :
1) Make TotalsDto an interface
2) Create getters:
public interface TotalsDto{
long getTotals();
int getCategoryId();
...
}
Spring Data Jpa will then automatically create / fill you result object.
More on the subject here