hibernate 分页代码

public List findAllCompanyByPageno(Integer pageNo,Integer rowNo)throws Exception{
    Session session = null;
    Transaction tr = null;
    List l= null;
    try{
     session=HibernateUtil.getSession();
     tr = session.beginTransaction();
     Query q = session.createQuery("from AirCompany as c");
     q.setFirstResult(pageNo*rowNo);
     q.setMaxResults(rowNo);
     l = q.list();
     
     tr.commit();
    }catch(Exception e){
     e.printStackTrace();
     tr.rollback();
     throw e;
    }finally{
     HibernateUtil.close();
    }
    return l;
   }