import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;


public class HibernateUtil {
    
    private static final SessionFactory sessionFactory;
    
    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (HibernateException ex) {
            ex.printStackTrace();
            throw new RuntimeException("Configuration problem: " + ex.getMessage(), ex);
        }
    }
    
    public static final ThreadLocal session = new ThreadLocal();
    
    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }
    
    public static void CreaSchema() throws Exception {
        
        Configuration cfg = new Configuration().configure();
        new SchemaExport(cfg).create(true, true);
    }
    
    
    
    
    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        session.set(null);
        if (s != null)
            s.close();
    }
}