Hibernate 的 Query.setParameter(String s, Object o) 方法无效

方法如下,获取日志设备分组

    public List<LogEntity> getGroup(String col) {
        MySession mySession = HibernateUtil.openSession();
        try {
            Query query = mySession.createQuery("from " + LogEntity.class.getName() + " group by :col");
            query.setParameter("col", col);
            String queryString = query.getQueryString();
            System.out.println(queryString);
            List<LogEntity> list = query.list();
            return list;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            mySession.close();
        }
        return null;
    }

调用代码如下

    TestLogDao dao = new TestLogDao();
    List<LogEntity> devices = dao.getGroup("devices");
    for (LogEntity en : devices) {
        System.out.println(en.getDevices());
    }

下面是打印结果

from com.mh.myservice.entity.LogEntity group by :col
SM-G9350

“:col”没有被替换为指定的列名

而把上面部分代码改为:

//不做参数绑定,直接写入语句中
Query query = mySession.createQuery("from " + LogEntity.class.getName() + " group by devices");

则结果正常

from com.mh.myservice.entity.LogEntity group by devices
H60-L01
MI 8
MI NOTE LTE
MIX 2
OD103
PBAM00
PRA-AL00X
Redmi 6
SM-G9350
SM-G9500
SM-G9550

请问有没有遇到过同样问题的??

java version "1.7"

hibernate version "5.1.1"

没毛病啊,仔细想想 statement 、prepareStatement 的区别!

另外,假定你数据库是mysql,数据表为 log_entity
原生sql语句:

 select * from  log_entity group by 'devices'

 select * from  log_entity group by devices

2者虽然都合法,但是含义是不等价的