[英]NHibernate QueryOver with sub-query and alias
I'm struggling to convert the following (simplified) HQL to QueryOver: 我正在努力将以下(简化)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)
)
I've come this far: 我走到这一步:
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());
The problem is that the above Subqueries
and Where
statement gives me the following (invalid) where clause: 问题是上面的
Subqueries
和Where
语句给了我以下(无效)where子句:
where shipment.SubscriptionId is null
when what I want is: 当我想要的是:
where shipment.SubscriptionId = subscription.Id
So the alias and its row-level value isn't taken into account when constructing the SQL, instead its initial value null
is used to compare to the Shipment
's SubscriptionId
. 因此,在构造SQL时不考虑别名及其行级值,而是将其初始值
null
用于与Shipment
的SubscriptionId
进行比较。
With dotjoe's provided solution, I was able to write the QueryOver
statement as follows: 使用dotjoe提供的解决方案,我能够编写
QueryOver
语句,如下所示:
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));
尝试
.Where(shipment => shipment.Subscription.Id == subscription.Id)
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