CODEWITHSUNDEEP
c#nhibernate
Morph
Morph

Reputation: 299

NHibernate SessionFactory

They say that to build a session factory in NHibernate is expensive and that it should only happen once. I use a singleton approach on this. This is done on the first time that a session is requested.

My question : Would there every be a time when you should close the Session factory? If so, when would one do this?

Upvotes: 4

Views: 6080

Answers (4)

Rich
Rich

Reputation: 2096

To AZ: This is referring to the SessionFactory, not the session. Though I wouldn't say there should only be one instance of SessionFactory. There should be one per unique configuration. For instance, if a single app is connecting to 2 different databases, then you need 2 different SessionFactory instances.

Upvotes: 2

vsingh
vsingh

Reputation: 6779

There should be only one instance of sessionfactory . The code above is not an example of singleton pattern. If you are working in an enterprise application, I would suggest use Spring with hibernate . That would help you out in managing transactions and take away all this headache of managing session factory

Upvotes: 0

Svante Svenson
Svante Svenson

Reputation: 12478

No, it dies with your program and that is fine.

Upvotes: 1

Lliane
Lliane

Reputation: 831

This is what i do in Java with Hibernate :

 public class HibernateUtil
{

    private static final SessionFactory sessionFactory;

    static
    {
        try
        {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new Configuration().configure().buildSessionFactory();
        }
        catch (Throwable ex)
        {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory()
    {
        return sessionFactory;
    }

}

You can free your SessionFactory when you don't need it anymore I guess, but honestly I've never closed my session factory

Upvotes: 6

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