getHibernateTemplate()的查询问题(已解决)

我想根据username来查询纪录，然后删除：
public void delete(String username) {
        String QueryUserByUsername = "from User u where u.username=:"+username;
        List list = getHibernateTemplate().find(QueryUserByUsername);
        User user = (User)list.get(0);
        getHibernateTemplate().delete(user);
    }
User有以下属性：id,username,age,address,job
但是总报错：
EVERE: Servlet.service() for servlet action threw exception
org.springframework.orm.hibernate3.HibernateQueryException: Not all named parameters have been set: [Bob] [from User u where u.username=:Bob]; nested exception is org.hibernate.QueryException: Not all named parameters have been set: [Bob] [from User u where u.username=:Bob]
org.hibernate.QueryException: Not all named parameters have been set: [Bob] [from User u where u.username=:Bob]
可能是我的hql语句不对。请问应该怎么写才能正常查询啊？谢谢~~~

[[italic] 本帖最后由 hwoarangzk 于 2007-12-28 16:14 编辑 [/italic]]