多条明细（绑定到一个字段）汇总

procedure TdmlSBWXJL_R.qryDataBeforePost(DataSet: TDataSet);
var
  BookMark: TBookmark;
  fYLJE, fYGJE : Extended;
begin
  inherited;
  fYLJE := 0;
  fYGJE := 0;
  BookMark := qryJXYL.GetBookmark;
  qryJXYL.DisableControls;
  try
    qryJXYL.First;
    while not qryJXYL.Eof do
    begin
      fYLJE := fYLJE + tvDetailJXYLSBWXYL_SL.AsFloat * tvDetailJXYLSBWXYL_JG.AsFloat;
      qryJXYL.Next;
    end;
  finally
    qryJXYL.GotoBookmark(BookMark);
    qryJXYL.FreeBookmark(BookMark);
    qryJXYL.EnableControls;
  end;
  BookMark := qryJXYG.GetBookmark;
  qryJXYG.DisableControls;
  try
    qryJXYG.First;
    while not qryJXYG.Eof do
    begin
      fYLJE := fYLJE + tvSBJXYGSBWXYG_GS.AsFloat * tvSBJXYGSBWXYG_JG.AsFloat;
      qryJXYG.Next;
    end;
  finally
    qryJXYG.GotoBookmark(BookMark);
    qryJXYG.FreeBookmark(BookMark);
    qryJXYG.EnableControls;
  end;
  qryDataSBWX_FY.AsFloat := fYLJE + fYGJE;
  if (qryData.State in [dsInsert]) and bIsGZL then
    CallBackOwnerForm(cbWFNewInst,'','');
end;