How do I get fluent nhibernate to save "null" to the db for uninitialized variables

Question

I have a class like this:

public class test
{
    public virtual int Id { get; private set; }
    public virtual char testType { get; set; }
    public virtual char testType2 { get; set; }
}

When I create this, but don't specificy testType2, I want the value to be "null" in the database. Instead, the value is an empty char. One way that I found to force this to be null is to use char? for the type. However, this apparently doesn't work for strings (doesn't compile), and I really don't want to mess with nullable types. Is there any way to get fluent nhibernate to always save uninitialized variables as "null"?

Edit: uninitialized string variables are saved as "null" in the db. I still need a solution for char and int.

Answer 1

public class test
{
    public virtual int? Id { get; private set; }
    public virtual DateTime? SomeDate { get; private set; }
    public virtual char? testType { get; set; }
    public virtual char? testType2 { get; set; }
}

All you need to do is to add a ? after the type.