Hibernate4 占位符(?)

Hibernate3使用？占位符：

Session session = sessionFactory.getCurrentSession();
  session.beginTransaction();
  //？占位符使用
  String sql = "update User t set t.username = ? where t.id = ?";
  Query query = session.createQuery(sql);
  query.setString(0, "hel");
  query.setInteger(1, 22);
  int result = query.executeUpdate();
  session.getTransaction().commit();
  System.out.println("result = " + result);

Hibernate4 占位符：

Session session = sessionFactory.getCurrentSession();
  session.beginTransaction();

  //使用占位符
  String sql = "update User t set t.username = :newname where t.id = :oldId";
  Query query = session.createQuery(sql);
  query.setString("newname", "hello");
  query.setInteger("oldId", 22);
  int result = query.executeUpdate();
  session.getTransaction().commit();
  System.out.println("result = " + result);