带子查询和别名的NHibernate QueryOver

Question

我正在努力将以下(简化的) HQL转换为QueryOver：

select subscription
from Subscription as subscription
where not exists (
    from Shipment as shipment
    where shipment.Subscription = subscription
    and (shipment.DeliveryDate  = :deliveryDate)
)

我已经走了这么远了：

Subscription subscription = null;

Session.QueryOver(() => subscription)
    .Where(Subqueries.NotExists(QueryOver.Of<Shipment>()
        .Where(shipment => shipment.Subscription == subscription)
        .And(shipment=> shipment.DeliveryDate == deliveryDate)
        .Select(shipment => shipment.Id).DetachedCriteria));
    .TransformUsing(new DistinctRootEntityResultTransformer());

问题是上面的Subqueries和Where语句给了我以下(无效的) where子句：

where shipment.SubscriptionId is null

当我想要的是：

where shipment.SubscriptionId = subscription.Id

因此，在构造SQL时不考虑别名及其行级值，而是使用它的初始值null与Shipment的SubscriptionId进行比较。

更新

使用dotjoe提供的解决方案，我能够按如下方式编写QueryOver语句：

Subscription subscription = null;

Session.QueryOver(() => subscription)
    .WithSubquery.WhereNotExists(QueryOver.Of<Shipment>()
        .Where(shipment => shipment.Subscription.Id == subscription.Id)
        .And(shipment => shipment.DeliveryDate == deliveryDate)
        .Select(shipment => shipment.Id));

Answer 1

试一试

.Where(shipment => shipment.Subscription.Id == subscription.Id)