In grails, what is the quickest way to obtain a reference to the current hibernate session?

Question

I got a singleton service and inside its only method I need to obtain a reference to the hibernate session bound to the current request. What is the quickest way of doing that?

Answer 1

We do it the following way:

import org.hibernate.Session;
import org.hibernate.SessionFactory;

public class YourService  {

    SessionFactory sessionFactory // set by Dependency Injection

    public void yourMethod() {
        Session session = sessionFactory.getCurrentSession();
        // do something with session
    }
}

When your service is in the grails-app/services directory and ends wirh "Service", the sessionFactory is injected by grails.

Answer 2

Or just

def someServiceMethod {
   SomeDomainObjectClass.withSession { session ->
     .....
   }
}

Domain objects are classes defined in grails-app/domain directory. session variable will obtain current Hibernate Session reference inside withSession closure.