这个语句为什么查不出数据？
    Criterion cria = Restrictions.like("uname", "三%");
        Calendar c = Calendar.getInstance();// java日历类
        c.set(2013, 11, 21);
        Criterion crib = Restrictions.ge("bith", c.getTime());
        Criterion cric = Restrictions.isNull("password");
        Criterion crid = Restrictions.and(cria, crib);
        cri.add(cria);
这几句分别是什么意思