http://nhforge.org/doc/nh/en/index.html#batch-statelesssession<http://nhforge.org/doc/nh/en/index.html#batch-statelesssession>"Collections
are ignored by a stateless session."
2009/9/9 ChrisHolmes <[email protected]>
>
> I'm having a problem using a StatelessSession and I don't understand
> why. Hoping for some help here.
>
> I've got a Movie entity that is mapped (fluently) like so:
>
> public class MovieMap : ClassMap<Movie>
> {
> public MovieMap()
> {
> Id(x => x.Id).UnsavedValue(0);
> Map(x => x.Title);
> Map(x => x.ReleaseYear);
> HasManyToMany(x => x.Directors)
> .FetchType.Select()
> .Table("MovieToDirector")
> .ParentKeyColumn("MovieId")
> .ChildKeyColumn("DirectorId");
> HasManyToMany(x => x.Actors)
> .FetchType.Select()
> .Table("MovieToActor")
> .ParentKeyColumn("MovieId")
> .ChildKeyColumn("ActorId");
> References(x => x.Genre).Column("GenreId").Not.LazyLoad
> ().Fetch.Select();
> }
> }
>
> As you can see, the Movie has sub-lists of Actors and Directors and
> references a class called Genre. I'm fetching the list of movies from
> the database and displaying them in a DataGrid like so:
>
>
> private void LoadMovies()
> {
> using (ITransaction tx = Session.BeginTransaction())
> {
> IList<Movie> movies = Session.CreateCriteria<Movie>
> ().List<Movie>();
>
> if (movies.Count > 0)
> movies = movies.OrderBy(x => x.Title).ToList();
>
> View.Movies = movies;
> tx.Commit();
> }
> }
>
> When I use a regular ISession, like above, it works fine. But I only
> want to display the Movie entities and I am not displaying anything to
> do with the child collections of Actor and Director. My thinking was
> that if I used a StatelessSession, I would be able to do this...
>
> However, when I change this from a ISession to a IStatelessSession, I
> get an exception:
>
>
>
> ---> NHibernate.ADOException: could not execute query
> [ SELECT this_.Id as Id2_0_, this_.Title as Title2_0_,
> this_.ReleaseYear as ReleaseY3_2_0_, this_.GenreId as GenreId2_0_ FROM
> dbo.[Movie] this_ ]
> [SQL: SELECT this_.Id as Id2_0_, this_.Title as Title2_0_,
> this_.ReleaseYear as ReleaseY3_2_0_, this_.GenreId as GenreId2_0_ FROM
> dbo.[Movie] this_] -
> --> NHibernate.AssertionFailure: possible non-threadsafe access to the
> session
> at NHibernate.Engine.TwoPhaseLoad.InitializeEntity(Object entity,
> Boolean readOnly, ISessionImplementor session, PreLoadEvent
> preLoadEvent, PostLoa
> dEvent postLoadEvent)
> at NHibernate.Loader.Loader.InitializeEntitiesAndCollections(IList
> hydratedObjects, Object resultSetId, ISessionImplementor session,
> Boolean readOn
> ly)
>
> What I don't understand about this is that it is complaining of a
> threading problem, but everything is happening on the same thread. And
> the exact line error indicates this line:
>
> IList<Movie> movies = Session.CreateCriteria<Movie>().List<Movie>();
>
> So I am not even getting to the point of ordering the movie list, or
> displaying it to the screen. I am only changing one thing in this
> code: I am changing the use from the Session to the StatelessSession,
> and that is it.
>
> Why is this happening and how can I fix it?
>
> Thanks,
>
> -Chris
>
> >
>
--
Fabio Maulo
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