NHibernate回滚似乎不起作用

Question

My question is simple. I have the below code and user is still inserted. When I check the database just after SaveOrUpdate (and before the rollback) I see user is already inserted. It's like flush mode and transaction not working. Where am I going wrong?

using (var session = sessionFactory.OpenSession())
{
    session.FlushMode = FlushMode.Never;

    using (var tran = session.BeginTransaction())
    {
        var user = CreateUser();

        session.SaveOrUpdate(user);

        tran.Rollback();
    }
}

Answer 1

If we check "just after SaveOrUpdate " ... we are still inside of one transaction. Lot of stuff could happen before final decision (commit or rollback).

And one of the operation would be to decide if object should be Created or Updated . So in case, that the ID generator is set to native/identity (eg SQL server) - NHibernate must execute the INSERT to get the ID. Lot of operation could be postponed, but to receive the ID - there is no way to wait.

So most likely your ID need to be obtained from DB.. and that's why INSERT happens. BUT other stuff won't be written into DB, until Flush() is called... So, I wouldn't mark described behaviour as something special.