Hibernate 更新指定字段的内容

import org.hibernate.Query;

public void testUpdate() {
Session session = sessionFactory.getCurrentSession();
session.beginTransaction();
Query q = session.createQuery("update Student s set s.name='z5' where s.id = 1");
q.executeUpdate();
session.getTransaction().commit();
}

public void testUpdate2() {
Teacher t = new Teacher();
t.setName("XXX");
Session session = sessionFactory.getCurrentSession();
session2.beginTransaction();
session2.update(t);
session2.getTransaction().commit();
}