Incorrect Syntax near “?” : Nhibernate Generated Query

Question

I am getting problem while working with positional parameters in Nhbernate.

Criteria GroupProperty is emitting sql with both named and positional variables.

This

Answer 1

It looks like a bug in NHibernate, but if you just want those results you can get the same result by using Projections.Distinct instead of Projections.GroupProperty, ie:

session.CreateCriteria(typeof(MatchStageFrom))
            .SetProjection(Projections.Distinct(
                Projections.SqlFunction("substring", NHibernateUtil.String, 
                    Projections.Property("LastName"), 
                    Projections.Constant(0), 
                    Projections.Constant(1))
                )
            );

Alternatively if you're selecting more than just the first char of the name, then you could probably get it to work using a subselect