Best way to delete all rows in a table using NHibernate?

Question

In the TearDown of my UnitTests, I mostly do this:

using( ISession s = ... )
{
   s.Delete ("from Object o");
   s.Flush();
}

This should delete all entities.
If you want to delete all instances of one specific entity, you can do this:

using( ISession s = .... )
{
    s.Delete ("from MyEntityName e");
    s.Flush();
}

Offcourse, there’s a drawback with this method, and that is that NHibernate will first fetch the entities before deleting them.