public class DbOperate {
      public boolean save(Object obj) throws HibernateException {
            boolean result = false;
            Session session = SessionFactory.currentSession();
            if (obj != null) {
                  Transaction tx = null;
                  try {
                        tx = session.beginTransaction();
                        session.save(obj);
                        tx.commit();
                        result = true;
                  } catch (HibernateException e) {
                        if (tx != null) {
                              tx.rollback();
                              result = false;
                        }
                  } finally {
                  session.close();
                  return result;
            }
      }
      return result;
}
public void update(Object obj) throws HibernateException {
      Session session = SessionFactory.currentSession();
      if (obj != null) {
            Transaction tx = null;
            try {
                  tx = session.beginTransaction();
                  ////System.out.println("aaaa");
                  session.update(obj);
                  ////System.out.println("bbbb");
                  tx.commit();
                  ////System.out.println("cccc");
            } catch (HibernateException e) {
                  if (tx != null)
                  tx.rollback();
                  throw e;
            }
      }
      session.close();
}
public void delete(Object obj) throws HibernateException {
      Session session = SessionFactory.currentSession();
      if (obj != null) {
            Transaction tx = null;
            try {
                  tx = session.beginTransaction();
                  session.delete(obj);
                  tx.commit();
            } catch (HibernateException e) {
                  if (tx != null)
                  tx.rollback();
                  throw e;
            }
      }
      session.close();
}
public void saveOrUpdate(Object obj) throws HibernateException {
      Session session = SessionFactory.currentSession();
      if (obj != null) {
            Transaction tx = null;
            try {
                  tx = session.beginTransaction();
                  session.saveOrUpdate(obj);
                  tx.commit();
            } catch (HibernateException e) {
                  if (tx != null)
                  tx.rollback();
                  throw e;
            }
      }
      session.close();
}
public List find(String sql) throws HibernateException {
      Session session = SessionFactory.currentSession();
      List list = null;
      Transaction tx = null;
      try {
            tx = session.beginTransaction();
            Query query = session.createQuery(sql);
            list = query.list();
            tx.commit();
      } catch (HibernateException e) {
            if (tx != null)
            tx.rollback();
            throw e;
      }
      session.close();
      return list;
}
}