NHibernate在HQL中加入数据

Question

我在NHibernate中映射了以下两个表：

VehicleCheck

ID (int) 
VehicleReg (varchar) 
DriverName (varchar) 
TS (datetime)

VehicleCheckItem

ID (int)
VehicleCheckID (int)
CheckType (int)
Passed (bit)

我想要做的是使用HQL或Criteria API获取每辆车的最新车辆检查和每辆车检查失败的数量。

在SQL中，这看起来像：

select VehicleCheck.ID, VehicleCheck.VehicleReg, VehicleCheck.DriverName,
VehicleCheck.TS, CheckItems.FailCount
FROM VehicleCheck
JOIN
    (select VehicleReg, Max(TS) TS
    FROM VehicleCheck
    GROUP BY VehicleReg) LastChecks
    ON LastChecks.VehicleReg = VehicleCheck.VehicleReg and LastChecks.TS = VehicleCheck.TS

LEFT OUTER JOIN
    (select VehicleCheckID, Count(Passed) FailCount
    FROM VehicleCheckItem
    Where Passed = 0
    GROUP BY VehicleCheckID) CheckItems
    on CheckItems.VehicleCheckID = VehicleCheck.ID

其中包含车辆登记最近车辆检查的ID，VehicleReg，DriverName，TS和FailCount。

我如何在HQL中执行此操作？ HQL是否支持连接中的子查询？

我得到了：

select vehicleCheck.ID, vehicleCheck.DriverName, vehicleCheck.VehicleReg, max(vehicleCheck.TS), 
count(vehicleCheckItems.Passed)
from VehicleCheck vehicleCheck
join vehicleCheck.VehicleCheckItems vehicleCheckItmes
group by vehicleCheck.VehicleReg

这给了我几乎正确的结果，但是VehicleReg的组导致VehicleCheckItems的计数是每Reg而不是每次检查是否有意义。

谢谢！