AssertionFailure: “null identifier” - FluentNH + SQLServerCE

Question

The code fails at

session.Save(employee);

with AssertionFailure \"null identifier\". What am I doing wrong?

using FluentNHibernate.Cf         


        

Answer 1

There's a "bug" when using NHibernate with SQL CE identity columns. There are two workarounds that I know of:

1 - Set the connection.release_mode property to on_close in configuration:

mySessionFactory = Fluently.Configure()
    .Database(MsSqlCeConfiguration.Standard
    .ConnectionString("Data Source=MyDB.sdf"))
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf())
    .ExposeConfiguration(BuildSchema)
    .ExposeConfiguration(x => x.SetProperty("connection.release_mode", "on_close"))
    .BuildSessionFactory();

2 - Perform inserts in a transaction:

    using (ISession session = DB.OpenSession())
    using (ITransaction txn = session.BeginTransaction())
    {
        session.Save(employee);
        txn.Commit();
    }

I realize the question is more than a month old but I hope this answer is still of use to you.

Answer 2

Is is still the true. Even first call to SELECT @@IDENTITY returns corect value, but seconds returns null

I use

*connection.driver_class = NHibernate.Driver.SqlServerCeDriver dialect: NHibernate.Dialect.MsSqlCeDialect*

After adding property *connection.release_mode: on_close* to my NHIbernate configuration it works