Attempt to obtain an upgrade lock, using an Oracle-style
            SELECT ... FOR UPGRADE NOWAIT. 
            
Namespace: NHibernateAssembly: NHibernate (in NHibernate.dll) Version: 3.2.0.4000 (3.2.0.4000)
Syntax
Remarks
            The semantics of this lock mode, once obtained, are the same as Upgrade