Nhibernate filtering by user defined function output

Question

I\'m reasonably new to NHibernate and everything has been going pretty well so far but I\'ve come across a problem I\'m not exactly sure of how to go about solving. Basicall

Answer 1

Creating custom dialect extensions is rather easy:

public class CustomFunctionsMsSql2005Dialect : MsSql2005Dialect 
{ 
   public CustomFunctionsMsSql2005Dialect() 
   { 
      RegisterFunction("calculatedistance",
                       new SQLFunctionTemplate(NHibernateUtil.Int32,
                                               "CalculateDistance(?1, ?2, ?3, ?4)"));
   }
}

Register it, like so:

  CustomFunctionsMsSql2005Dialect, MyAssembly

Now you can use it like any other HQL function in queries like those created with session.CreateQuery().