TClientDataSet[16]: 用计算字段显示 UpdateStatus

TClientDataSet.UpdateStatus: TUpdateStatus;
TUpdateStatus = (usUnmodified, usModified, usInserted, usDeleted);

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测试图:

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相关代码:

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uses TypInfo;

procedure TForm1.ClientDataSet1CalcFields(DataSet: TDataSet);
begin
  ClientDataSet1.FieldByName('UpdateStatus').AsString :=
    GetEnumName(TypeInfo(TUpdateStatus), Ord(ClientDataSet1.UpdateStatus));
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ClientDataSet1.MergeChangeLog;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  ClientDataSet1.Delete;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  ClientDataSet1.UndoLastChange(True);
end;