ftestmidasclientmain.pas

就是这本书的随书代码。包括《实战Delphi 5.x-分布式多层应用系统篇》

unit fTestMidasClientMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Db, DBClient, MConnect, StdCtrls, Grids, DBGrids, ExtCtrls, DBCtrls;

type
  TForm2 = class(TForm)
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    ClientDataSet1: TClientDataSet;
    DCOMConnection1: TDCOMConnection;
    Panel1: TPanel;
    Button1: TButton;
    DBNavigator2: TDBNavigator;
    DBGrid2: TDBGrid;
    ClientDataSet2: TClientDataSet;
    DataSource2: TDataSource;
    cbFields: TComboBox;
    edtOldValue: TEdit;
    edtNewValue: TEdit;
    edtValue: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure ClientDataSet1ReconcileError(DataSet: TClientDataSet;
      E: EReconcileError; UpdateKind: TUpdateKind;
      var Action: TReconcileAction);
    procedure FormActivate(Sender: TObject);
    procedure cbFieldsChange(Sender: TObject);
    procedure ClientDataSet1AfterPost(DataSet: TDataSet);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.DFM}

procedure TForm2.Button1Click(Sender: TObject);
begin
  ClientDataSet1.ApplyUpdates(0);
end;

procedure TForm2.ClientDataSet1ReconcileError(DataSet: TClientDataSet;
  E: EReconcileError; UpdateKind: TUpdateKind;
  var Action: TReconcileAction);
begin
  ClientDataSet2.Data := DataSet.Data;
end;

procedure TForm2.FormActivate(Sender: TObject);
var
  iCount : Integer;
begin
  for iCount := 0 to ClientDataSet1.FieldCount - 1 do
  begin
    cbFields.Items.Add(ClientDataSet1.Fields[iCount].FieldName);
  end;
end;

procedure TForm2.cbFieldsChange(Sender: TObject);
begin
  edtOldValue.Text := ClientDataSet1.FieldByName(cbFields.Text).OldValue;
  edtNewValue.Text := ClientDataSet1.FieldByName(cbFields.Text).NewValue;
  edtValue.Text := ClientDataSet1.FieldByName(cbFields.Text).CurValue;
end;

procedure TForm2.ClientDataSet1AfterPost(DataSet: TDataSet);
begin
  ClientDataSet2.Data := ClientDataSet1.Delta;
end;

end.