@Override
  public boolean login(String staffid, String password) {
    Staff staff = staffDao.findByStaffId(staffid);
    if (staff == null) {
      return false;
    }

    if (password.equals(staff.getPassword())) return true;
    else return false;
  }
 private StaffInfo convertEntity(Staff entity) {
   StaffInfo temp = new StaffInfo();
   temp.setId(entity.getId());
   temp.setStaffid(entity.getStaffid());
   temp.setPosition(entity.getPosition());
   temp.setStaffname(entity.getStaffname());
   temp.setPassword(entity.getPassword());
   temp.setRemarks(entity.getRemarks());
   return temp;
 }