Hi, I'm new to NHibernate and this forum so go easy...

I have setup versioning and it's working. I now have to fulfil a requirement that all versions of the entities are saved in the database, so it will be possible to "roll back" to a previous version of the entity.

NHibernate only increments the version number as far as I can tell. How can I make the versioning create a new row?

This needs to deal with the fact that the entities have child relationships too.

Thanks,
Jonty

Is this actually something that NHibernate deals with? If not, can anyone share their implementation? It must be a fairly common scenario.

Hibernate's versioning and audit/change tracking are completely different approaches. You can use an Interceptor for the latter:

http://www.hibernate.org/318.html

It's for hibernate but it shows the idea. With NHibernate 2.0 you'll probably are better of with using the event system. Checkout the documentation about NH 2.0

http://www.nhforge.org/wikis/reference2-0en/default.aspx