Question

我有3个表：组织，车辆和 VehicleStatus 。

带车辆的组织（一对多）。（一个组织可以有很多车辆）。使用VehicleStatus的车辆（一对多）（车辆具有我们在状态更改时存储的不同状态，VehicleStatus具有statusDate列以在状态更改完成时存储）。

我想获得statusType（列）具有BROKEN且属于位于NewYork的组织的车辆。

VehicleStatus（id，statusType，statusDate，Vehicle）车辆（身份证，组织）组织（身份证，城市）

这是SQL查询：

SELECT * FROM Vehicles V, VehicleStatus VS, Organization O
where (V.id = VS.Vehicle) AND (V.organisation = O.id)
and (O.city = "Bordeaux")
and (VS.statusType = "Broken")
and (VS.statusDate == (select Max(statusDate) from VehicleStatus groupBy vehicle where vehicle = V.id);

如何在JPQL中转换它？

感谢

Answer 1

You can achieve this with the 

In Vehicle entity  you should have the relation as like 

@ManytoOne
@joinColumns(name="organization_id" , insertable=false, updatable=false)
private Organization organization;

and in you should have the  relationship to the  VehicleStatus entity as below in Vehicle entity

@OneToMany
private List<VehicleStatus> vehicleStatuses;

，您的查询应该是这样的

List<Vehicle> Vehicles=createQuery("select new Vehicle(required column list )  from  Vehicle v left join v.organization o  left join v.vehicleStatuses vs where  vs.status=?1 and o.organizationId=?2")
.setparameter(1,status)
.setParameter(2,organizationId)
.getResultList();

对JPQL的复杂SQL查询

1 个答案: