hibernate中Query条件查询两种方式

//方法一
  Session session =sf.openSession();
    Transaction tr =session.beginTransaction();
    Query query=session.createQuery("from StudentBean where parentid=?");
    query.setInteger(0,id);
    List<StudentBean> list =query.list();
    tr.commit();
    session.close();

//方法二
  Session session =sf.openSession();
    Transaction tr =session.beginTransaction();
Query query=session .createQuery("from Employee where userName=:userName");
    query.setString("userName", name);
    List<Employee>list=query.list();
    tr.commit();
session.close();