Hibernate怎么在使用模板查询且分页时 获得记录总数

 Criteria criteria = getSession().createCriteria(o.getClass()).add(  
          Example.create(o));  
int count=((Number) criteria .setProjection(Projections.rowCount())
							.uniqueResult()).intValue();
				criteria.setProjection(null);
      criteria.setFirstResult(counter.getBegin());  
        criteria.setMaxResults(counter.getSize());  
         return criteria.list();