private function delete()
 {
     \CADB\Fields\DBM::delete($this->field);
     if ($this->field['iscolumn']) {
         \CADB\Fields\DBM::dropColumn($this->params);
     }
     $this->fid = $this->params['fid'];
     \CADB\RespondJson::ResultPage(array($this->fid, '삭제되었습니다.'));
 }