main.pas

Delphi7数据库开发教程,包含该书21套实例

unit main;

interface

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

type
  TForm1 = class(TForm)
    ADOConnection1: TADOConnection;
    ADODataSet1: TADODataSet;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    btnClose: TButton;
    btnConnect: TButton;
    btnDisconnect: TButton;
    procedure btnCloseClick(Sender: TObject);
    procedure btnConnectClick(Sender: TObject);
    procedure btnDisconnectClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnCloseClick(Sender: TObject);
begin
  Close;
end;

procedure TForm1.btnConnectClick(Sender: TObject);
begin
  ADODataSet1.Active := True;
  //如果连接成功则设置按钮状态
  if ADOConnection1.Connected then
  begin
    btnConnect.Enabled := False;
    btnDisconnect.Enabled := True;
  end;
end;

procedure TForm1.btnDisconnectClick(Sender: TObject);
begin
  ADODataSet1.Active := False;
  ADOConnection1.Close; 
  //如果成功断开连接则设置按钮状态
  if not ADOConnection1.Connected then
  begin
    btnConnect.Enabled := True;
    btnDisconnect.Enabled := False;
  end;

end;

end.