将原始 sql 查询映射到 DTO 对象 Spring

Question

SPRING BOOT , JAVA 11 , POSTGRES

I have a big SQL query:

select c.id,c.image_url,c.status,c.name, cat.id,cat.name
from client_organization o join organization c
on o.organization_id = c.id
join client w on o.client_id = w.id
join org_category cat on c.category_id = cat.id
where w.id = ?

So i need to convert the given result to List of Data Transfer Objects(DTO). If it is important, here is my DTO(constructor, getters and setters are not included):

public class OrganizationListDto {
    Long id;
    String image;
    Boolean status;
    String name;
    Long categoryId;
    String categoryName;
}

I have been looking for solution for some days and found that this operation can be implemented in different ways(jdbc, hibernate etc) So please explain me what and when I need to use them? How to implement this operation?

Answer 1

Follow the below approach have used spingJpa

@Service public class OrganizationServiceImpl

{
    @Autowired
    OrganizationListRepository organizationListRepository;

        public OrganizationListDto  fetch(usrId)
        {
        OrganizationListDto orgListData = new OrganizationListDto();
    List<OrganizationListMapping> orgData = organizationListRepository.fetchData(usrId);
    BeanUtils.copy(orgData,orgListData)

        return orgData;
        }

}

@Repository public interface OrganizationListRepository extends JpaRepository{

@Query(native="true",value="select  cat.id as id,cat.name as name
from client_organization o join organization c
on o.organization_id = c.id
join client w on o.client_id = w.id
join org_category cat on c.category_id = cat.id
where w.id = usrId"
OrganizationListMapping fetchData(@Param ("usrId") Integer usrId);
}

public interface OrganizationListMapping {
    public Long getId();
    public String getName();

}


public class OrganizationListDto {
    Long id;
    String name;

}