hibernate练习遇到有查询语句然而没有查询结果的问题

Question

 //criteria查询测试
    @SuppressWarnings("unchecked")
    public List<House> criteriaQuery() {
        List<House> house =  HibernateSessionfactory.getSession()
                .createCriteria(House.class,"h")
//              .add(Restrictions.eq("h.price", 5000.00))
                .add(Restrictions.between("h.price", 4000.00, 7000.00))
//              .add(Restrictions.disjunction().add(Restrictions.eq("type_id", 1000)))
//              .add(Restrictions.like("title", "一",MatchMode.START))
//              .addOrder(Order.asc("houseid"))
                .list();

        return house;
    }

当我使用 .add(Restrictions.eq("h.price", 5000.00))完全没有问题。结果如下

 Hibernate: 
    select
        this_.houseid as houseid1_0_,
        this_.user_id as user2_1_0_,
        this_.type_id as type3_1_0_,
        this_.title as title1_0_,
        this_.description as descript5_1_0_,
        this_.price as price1_0_,
        this_.pubdate as pubdate1_0_,
        this_.floorage as floorage1_0_,
        this_.contact as contact1_0_,
        this_.street_id as street10_1_0_ 
    from
        `house` this_ 
    where
        this_.price=?
11001   中关村两居
11004   一室两厅
11005   一室两厅

是有结果的。问题是我注释掉eq语句改用between的时候就没有结果了。debug时house返回值也是null。执行结果是

 Hibernate: 
    select
        this_.houseid as houseid1_0_,
        this_.user_id as user2_1_0_,
        this_.type_id as type3_1_0_,
        this_.title as title1_0_,
        this_.description as descript5_1_0_,
        this_.price as price1_0_,
        this_.pubdate as pubdate1_0_,
        this_.floorage as floorage1_0_,
        this_.contact as contact1_0_,
        this_.street_id as street10_1_0_ 
    from
        `house` this_ 
    where
        this_.price between ? and ?

这就查询没有结果了。这个语句拿到MySQL里面去又是可以查到结果的，所以本身不是结果null，hibernate为什么没结果？我不太懂，郁闷啊，大神指教一下！