I would appreciate some help combining logical expressions in criteria
queries.
My toy object model is three classes
Order and a subclass SpecialOrder
Person
each Order has a Person property. I'm trying to do a query for all Orders
where the order is of type special order or where the Order.Person is not
deleted. I've tried this:
DetachedCriteria detached= DetachedCriteria.For(typeof(Person), "p")
.Add(Property.ForName("p.IsDeleted").Eq(false));
ICriteria criteria = session.CreateCriteria(typeof (Order))
.Add(Restrictions.Or(
Property.ForName("class").Eq(typeof(SpecialOrder)),
Property.ForName("Person").Eq(detached)
)).List();
but I get a null Reference exception in:
"NHibernate.Criterion.SubqueryExpression.InitializeInnerQueryAndParameters(ICriteriaQuery
criteriaQuery)"
Any thoughts on how to get this kind of query right?
Thanks
Jon
P.S. I'm expecting that the sql generated should look something like this:
select .... from Orders o, left out join Persons p on o.PersonID = p.ID
where
o.Class = 'SpecialOrder' or (o.PersonID is not null and p.IsDeleted = 0)
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