Question

Last night I started working on an NHibernate provider. I m creating a criteria that several records will match, however I only want to return the most recent record (the record with the largest Id). I thought UniqueResult() would do this it cannot be used if a list would be returned otherwise.

I could theoretically select the full list and then return the desired record, but I believe there is a better way.

Answer 1

Can you add an Order?

ICriteria cr = Session.CreateCriteria<MyType>();

cr.AddOrder(Order.Desc("Id"));

MyType justone = cr.UniqueResult();

Answer 2

Here is ultimately what was required. It was actually a combination of a couple of things I had earlier tried.

MyObject mo = (MyObject)_session.CreateCriteria(typeof(MyObject))
                .Add(Restrictions.Eq("Property", value))
                .AddOrder(Order.Desc("Id"))
                .SetMaxResults(1).UniqueResult();
            Log.Info(this, string.Format("Retrieving latest MyObject {0}.", mo.Name));
            return mo;

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