10/5/2011 8:41:28 PM
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9/20/2011 2:47:09 AM
Hibernate Demo
Tạo file "SessionFactoryUtil.java" package hibernateExample; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; /** * This class garanties that only one single SessionFactory * is instanciated and that the configuration is done thread safe as * singleton. Actually it only wraps the Hibernate SessionFactory. * You are free to use any kind of JTA or Thread transactionFactories. */ public class SessionFactoryUtil { /** The single instance of hibernate SessionFactory */ private static SessionFactory sessionFactory; /* disable contructor to guaranty a single instance */ private SessionFactoryUtil() { } static{ // Annotation and XML sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); // XML only //sessionFactory = new Configuration().configure().buildSessionFactory(); } public static SessionFactory getInstance() {return sessionFactory;} /** * Opens a session and will not bind it to a session context * @return the session */ public Session openSession() {return sessionFactory.openSession();} /** * Returns a session from the session context. If there is no session in the context it opens a session, * stores it in the context and returns it. * This factory is intended to be used with a hibernate.cfg.xml * including the following property thread This would return * the current open session or if this does not exist, will create a new * session * * @return the session */ public Session getCurrentSession() { return ((SessionFactoryUtil) sessionFactory).getCurrentSession(); } /** * closes the session factory */ public static void close(){ if (sessionFactory != null) sessionFactory.close(); sessionFactory = null; } }
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