SPRING BOOT,JAVA 11和POSTGRES
我有一个很大的SQL查询:
select c.*, 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 = ?
所以我需要将给定的结果转换为数据传输对象列表(DTO)。如果重要的话,这里是我的DTO(不包括构造函数,getter和setter):
public class OrganizationListDto {
Long id;
String image;
Boolean status;
String name;
Long categoryId;
String categoryName;
}
我一直在寻找解决方案,发现该操作可以通过不同的方式(jdbc,休眠等)实现。因此,请向我解释什么以及何时需要使用它们?如何执行此操作?
Follow the below approach have used spingJpa
@服务公共类OrganizationServiceImpl
{
@Autowired
OrganizationListRepository organizationListRepository;
public OrganizationListDto fetch(usrId)
{
OrganizationListDto orgListData = new OrganizationListDto();
List<OrganizationListMapping> orgData = organizationListRepository.fetchData(usrId);
BeanUtils.copy(orgData,orgListData)
return orgData;
}
}
@存储库公共接口OrganizationListRepository扩展了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;
}