struts+hibernate 问题。。

错误：
     javax.servlet.ServletException: could not execute query
 
action文件：
     
    public ActionForward execute (ActionMapping mapping,  
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response) {
        IndexForm indexform = new IndexForm();
        Session session = HibernateSessionFactory.getSession();
        String hql="from welcome i where i.name="+request.getParameter("name")+" and i.password="+request.getParameter("password");
        Query query = session.createQuery(hql);
        System.out.println(hql);
        List list = null;
        list = query.list();
        System.out.println(list.size());
        if(list.isEmpty())
            return mapping.findForward("no");
        else
            return mapping.findForward("ok");
    }

奇怪的是我在页面上输入一条数据库里没有的数据他会正确forword到no，如果数据库里有数据他就报could not execute query 错误。请教了。。。。。