使用 TClientDataSet(1)

本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, Grids, DBGrids, DB, DBClient, StdCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    Panel1: TPanel;

    Button1: TButton;

    Button2: TButton;

    ClientDataSet1: TClientDataSet;

    DataSource1: TDataSource;

    DBGrid1: TDBGrid;

    procedure FormCreate(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



{本来可以不写代码, 设置四个属性即可}

procedure TForm1.FormCreate(Sender: TObject);

var

  DataFile: string;

begin

  {获取 CodeGear 共享安装的数据文件: country.xml 的路径}

  DataFile := GetEnvironmentVariable('COMMONPROGRAMFILES');   {C:\Program Files\Common Files}

  DataFile := DataFile + '\CodeGear Shared\Data\country.xml'; {country.cds 也可}



  DBGrid1.DataSource := DataSource1;     {DBGrid 需要连接数据源}

  DataSource1.DataSet := ClientDataSet1; {数据源 DataSource 需要连接数据集}

  ClientDataSet1.FileName := DataFile;   {让数据集 ClientDataSet 关联一个数据文件}



  {打开数据集}

  ClientDataSet1.Active := True; //或 ClientDataSet1.Open;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 251

  ClientWidth = 439

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  PixelsPerInch = 96

  TextHeight = 13

  object Panel1: TPanel

    Left = 0

    Top = 0

    Width = 439

    Height = 41

    Align = alTop

    Caption = 'Panel1'

    TabOrder = 0

    object Button1: TButton

      Left = 20

      Top = 8

      Width = 75

      Height = 25

      Caption = 'Button1'

      TabOrder = 0

    end

    object Button2: TButton

      Left = 101

      Top = 8

      Width = 75

      Height = 25

      Caption = 'Button2'

      TabOrder = 1

    end

  end

  object DBGrid1: TDBGrid

    Left = 0

    Top = 41

    Width = 439

    Height = 210

    Align = alClient

    TabOrder = 1

    TitleFont.Charset = DEFAULT_CHARSET

    TitleFont.Color = clWindowText

    TitleFont.Height = -11

    TitleFont.Name = 'Tahoma'

    TitleFont.Style = []

  end

  object DataSource1: TDataSource

    Left = 160

    Top = 104

  end

  object ClientDataSet1: TClientDataSet

    Aggregates = <>

    Params = <>

    Left = 168

    Top = 112

  end

end