NHibernate Validator and Schema Export question

Question

I'm learning to use NHibernate validator and it's Fluent API (Loquacious).

I have noticed is that I can't set an integer property or nullable int property (int?) to be not nullable. Well, why not?

In a database, an integer column can have null values. Even worse, when I generate DDL using SchemaExport, the integer column wont be picking up that non-nullabity (unless I express it in the Nhibernate mappings).

Answer 1

If you specify the validators using ValidatorDef<>, this is detected by the the schema export, and you'll get the appropriate SQL definitions, example:

public class InvoiceValidationDef : ValidationDef<Invoice>
{
   public InvoiceValidationDef()
   {
       ...
       Define(x => x.Description).NotNullable().And.MaxLength(255);
       ...
   }
}

Results in

create table Invoices (
   ...
   Description NVARCHAR2(255) not null,
   ...
)