Hibernate執行原始SQL

public void batchUpdate(String year,String state) throws Exception {
    SessionFactory sessionFactory=getHibernateTemplate().getSessionFactory();
        Session session=sessionFactory.openSession();
    Transaction tx=session.beginTransaction();
    Connection conn=session.connection();
    PreparedStatement stmt=conn.prepareStatement("update regioncountyfactory t set t.state="+state+" where t.year="+year);
    stmt.executeUpdate();
    tx.commit();
        }