Hi All,

I'm going through the initial tutorial, why is it that the listEvents function below needs to wrap the list function in a transaction? I would've thought we could do a read only query without needing a transaction?

From tutorial:

private List listEvents() {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List result = session.createQuery("from Event").list();
session.getTransaction().commit();
return result;
}

For every interaction thru Hibernate layer, you need to have a Transaction [ This is hibernate transaction object and not the JDBC Transaction one]. This object internally manages the resources and acts specific to the underlying JDBC connection.

Hence you need to begin transaction for INSERT, UPDATE, READ , DELETE in Hibernate.

Essentially, this code is going to the database, and to go to the database, you need a transaction. A transaction simply represents a 'unit of work' at the most basic level. Going to the database is work. :)