Hibernate Sort String field after changing to Integer

	Criteria criteria = getCurrentSession().createCriteria(LabOrder.class);

		criteria.createAlias("practice", "pract", JoinType.INNER_JOIN);
		criteria.createAlias("patient", "pat", JoinType.INNER_JOIN);
		criteria.createAlias("labpanel", "panel", JoinType.LEFT_OUTER_JOIN);
		criteria.addOrder(new org.hibernate.criterion.Order("orderNo", true) {
			@Override
			public String toSqlString(Criteria criteria,
					CriteriaQuery criteriaQuery) throws HibernateException {
				return "cast(orderNo as UNSIGNED) desc";
			}
		});