TClientDataSet.Data { 数据的二进制格式的描述 }TClientDataSet.XMLData { 数据的 XML 格式的描述 }
//先在窗体上放置 ClientDataSet1、Memo1 和三个按钮uses XMLDoc, IOUtils; { 分别提供 FormatXMLData 和 TFile.ReadAllText 函数 }{ 设定当前目录 }procedure TForm1.FormCreate(Sender: TObject);begin ChDir(GetEnvironmentVariable('COMMONPROGRAMFILES') + '\CodeGear Shared\Data\');end;{ 读取 XMLData 测试 }procedure TForm1.Button1Click(Sender: TObject);begin ClientDataSet1.LoadFromFile('employee.cds'); Memo1.Text := FormatXMLData(ClientDataSet1.XMLData);end;{ 写入 XMLData 测试 }procedure TForm1.Button2Click(Sender: TObject);var str: string;begin str := TFile.ReadAllText('country.xml'); ClientDataSet1.XMLData := str; Memo1.Text := FormatXMLData(ClientDataSet1.XMLData);end; { 读写 Data 测试 }procedure TForm1.Button3Click(Sender: TObject);var ClientDataSet2: TClientDataSet;begin ClientDataSet2 := TClientDataSet.Create(Self); ClientDataSet2.LoadFromFile('parts.cds'); ClientDataSet1.Data := ClientDataSet2.Data; ClientDataSet2.Free; Memo1.Text := FormatXMLData(ClientDataSet1.XMLData);end;{ 合并两个数据集 }procedure TForm1.Button4Click(Sender: TObject);var cds1,cds2: TClientDataSet;begin cds1 := TClientDataSet.Create(Self); cds2 := TClientDataSet.Create(Self); cds1.LoadFromFile('industry.cds'); ShowMessage(IntToStr(cds1.RecordCount)); { 7 } //把 cds1 的结构与数据复制到 cds2 cds2.Data := cds1.Data; ShowMessage(IntToStr(cds2.RecordCount)); { 7 } //把 cds1 的数据合并到 cds2 cds2.AppendData(cds1.Data, True); ShowMessage(IntToStr(cds2.RecordCount)); { 14 } //把 cds2 的数据合并到 cds1 cds1.AppendData(cds2.Data, True); ShowMessage(IntToStr(cds1.RecordCount)); { 21 } cds1.Free; cds2.Free;end;
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