NHibernate或存在

Question

我无法将以下内容转换为Sql到nhibernate：

SELECT DISTINCT Booking.*
FROM   Booking WHERE  Booking.Status = 2
            OR EXISTS (SELECT 1
            FROM   JourneyFuture
            WHERE  JourneyFuture.BookingId = Booking.BookingId
                    AND ((JourneyFuture.[IsDriverAssigned] = 0
                        AND JourneyFuture.[Status] = 1) -- live
                        OR JourneyFuture.[Status] = 2
                        OR JourneyFuture.[Status] = 4
                        OR (JourneyFuture.[Status] = 1
                            AND (JourneyFuture.IsMetricCalculated = 0
                                    OR JourneyFuture.Duration = 0
                                    OR JourneyFuture.Distance = 0))))

到目前为止，这是我对Nhibernate的看法：

Booking bookingAlias = null;    
var journeyFuture = QueryOver.Of<JourneyFuture>().Where(x=> x.Booking.Id==bookingAlias.Id).
                    And(x => (!x.IsDriverAssigned && x.Status==JourneyStatusType.Live) || x.Status==JourneyStatusType.CancelRequested
                                || x.Status == JourneyStatusType.Modified || 
                                (x.Status == JourneyStatusType.Live && (!x.IsMetricCalculated || x.Duration==0 || x.Distance==0)))
                                .Select(x=> x.Booking);

                var result = session.QueryOver<Booking>(() => bookingAlias)
                    .Where(x => x.Status == BookingStatusType.CancelRequested)
                    .WithSubquery.WhereExists(journeyFuture)
                    .List<Booking>();

然而，这产生了一个“和”存在是有道理的，但我如何获得OR EXISTS？

任何帮助表示感谢。

Answer 1

以下内容应该有效：

Booking bookingAlias = null;    
var journeyFuture = QueryOver.Of<JourneyFuture>().Where(x=> x.Booking.Id==bookingAlias.Id).
    And(x => (!x.IsDriverAssigned && x.Status==JourneyStatusType.Live) || x.Status==JourneyStatusType.CancelRequested
                || x.Status == JourneyStatusType.Modified || 
                (x.Status == JourneyStatusType.Live && (!x.IsMetricCalculated || x.Duration==0 || x.Distance==0)))
                .Select(x=> x.Booking);

var result = session.QueryOver<Booking>(() => bookingAlias)
    .Where(
        Restrictions.Or(
            Restrictions.Where(() => bookingAlias.Status == BookingStatusType.CancelRequested),
            Subqueries.Exists(journeyFuture.DetachedCriteria)))
    .List<Booking>();

基本上用更强大的.WithSubquery和Restrictions.Or替换Subqueries.Exists。我希望有一种方法可以用.WithSubquery来做到这一点，但我不确定是否存在。

一般而言，通过复杂的限制，您可以深入了解Restrictions课程。这样做的缺点是它通常会使您的代码更复杂。