TClientDataSet的操作

记性不好了，唉，这里写个被忘

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids, DB, DBClient, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    ClientDataSet1: TClientDataSet;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
begin
  ClientDataSet1.LoadFromFile('E:\TEMP.XML');
end;


procedure TForm1.Button1Click(Sender: TObject);
var  tempClientDataSet : TClientDataSet;
begin
tempClientDataSet := TClientDataSet.Create(self);
try    with tempClientDataSet do
  begin
        with FieldDefs.AddFieldDef do
        begin
               DataType := ftInteger;
               Name     := 'Field1';
        end;
        with FieldDefs.AddFieldDef do
        begin
               DataType := ftdatetime;
               Name     := 'Field2';
        end;
        createDataSet;
        appendRecord([3,now]);
        appendRecord([1,now]);
        appendRecord([2,now]);
        tempClientDataSet.AddIndex('T1', 'Field1', []);
        tempClientDataSet.IndexName := 'T1';
        first;
        while not EOF do
          begin
              showmessage(intToStr(FieldByName('Field1').AsInteger)+formatdatetime('yyyymmdd HH:NN:DD',FieldByName('Field2').AsDateTime ));
              next;
          end;
        end;
        tempClientDataSet.SaveToFile('E:\TEMP.XML');
  finally
  tempClientDataSet.Free;
end;
end;



end.