I have an unusual DB schema, which however I would rather not change.

Most of my tables have a composite key. For instance, the Donor table's key is donornum plus year. Each year, I copy all Donors to the new year, retaining their donornum and incrementing the year.

However, donornum is a generated column, so that when I add a new Donor (not a copy from the previous year), it gets a generated new donornum that no other donor has. (In Firebird, it will be done by a Generator.)

Can that be modelled successfully in NHibernate?

Thanks.