Based on question How to return a custom object from a Spring Data JPA GROUP BY query , my custom query is working, as follows:
@Query("select new br.com.cwidevs.dto.Goleador(j.id, sum(pj.gols)) from PartidaJogador pj join pj.id.jogador j group by j.id")
public List<Goleador> getGoleadores();
Here is the simple bean class:
public class Goleador {
private Long jogador;
private Long totalGols;
}
At this point, how to implement ORDER BY
? Can I achieve thi with Sort ?
Try this:
@Entity
public class Goleador {
//...
}
@Entity
public class PartidaJogador {
//...
@ManyToOne
private Goleador jogador;
private Long gols;
//...
}
// DTO as Projection
public interface GoleadorWithGols {
Goleador getGoleador();
Long getTotalGols()
}
public interface GoleadorRepo extends JpaRepository<Goleador, Long> {
@Query("select j as goleador, sum(pj.gols) as totalGols from PartidaJogador pj join pj.jogador j group by j order by totalGols")
List<GoleadorWithGols> getGoleadores();
}
Here we use a projection GoleadorWithGols as DTO to get necessary data.
More info is here .
JpaRepository extends PagingAndSortingRepository so you can definetly use Sort
Add parameter to your methodpublic List<Goleador> getGoleadores(Sort sort);
when you call it just specify by which column you want to sort your query and you should be good.
repoGoleador.getGoleadores(new Sort("jogador"));
I just solved this problem:
Class-based Projections
doesn't work with query
native(@Query(value = "SELECT ...", nativeQuery = true))
So I recommend to define custom DTO
using interface. Before using DTO
should verify the query syntactically correct or not.
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