java hibernate要怎么备份数据库啊

public class backupDAO {
public void backups( String filename) {
  Session session = HibernateSessionFactory.getSession();
  Transaction t =  session.beginTransaction();
  System.out.println(filename);
  String sql =  "backup database key to disk='d:\\"+filename+"'";
  Query q =session.createQuery(sql);
  session.save(q);
  t.commit();
  session.flush();
          session.close();
  }
}