Automatically truncating strings in NHibernate / SQL Server

Question

I have a nvarchar(2000) column in a SQL Server 2005 database, and have mapped this into NHibernate as:

Answer 1

Create a custom User Type and which truncates the string if it's longer than 2000 chars. Here is sample of creating User Type

<property name="Query" type="Common.Nhibernate.Types.StringTruncType, Common" column="`Query`" type="String" length="2000" not-null="false"/>