Question

i got problem with load and evict in session of hibernate here are the codes.

        public virtual void ClearData(T obj)
    {

        using (ISession ses = SessionManager.OpenSession())
        {
            ses.Evict(obj);
        }

    }

        public virtual T Load<T>(object id)
    {
        using (ISession ses = SessionManager.OpenSession())
        {
            return (T)ses.Load(typeof(T), id);
        }
    }

calling it with

            Firmy fir = new Firmy();
        fir.ClearData(fir);
        var yol = fir.Load<Firmy>(6);
        Response.Write("<br/><br/><br/> TEST get");
        Response.Write(yol.NazwaFirmy);
        Response.Write("<br/><br/><br/> TEST EVI");
        fir.ClearData(yol);
        Response.Write(yol.NazwaFirmy);

and here is session menager

    public  class SessionManager
{
    #region Class Member Declarations
    private static readonly ISessionFactory _sessionFactory;
    private static readonly Configuration _configuration;
    #endregion
    static SessionManager()
    {
        _configuration = new Configuration();
        _configuration.Configure();
        _configuration.AddAssembly(typeof(SessionManager).Assembly);
        _sessionFactory = _configuration.BuildSessionFactory();
    }


    public static ISession OpenSession()
    {
        return _sessionFactory.OpenSession();
    }
    #region Class Property Declarations

    public static ISessionFactory SessionFactory
    {
        get { return _sessionFactory; }
    }
    #endregion
}

I wanna to load some data of fir with load function and then clear data with cleardata but idk how to do this was based on some tutroial.

Answer 1

Where do you exaclty get the error?

A couple of things that are not ok:

• You’re calling evict (first time) for an object that is not related to any nhibernate session (you just created it). Evict is for detaching an object from a session, but only make sense if you loaded the object with that session.

• You create a session on every opearation and that’s not the recommended way to go. You load an object with one session and then you try to evict it on a different session and that’s not possible.