unit4.pas

delphi开发的图书馆管理系统

unit Unit4;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, DBGrids, jpeg, ExtCtrls;

type
  TForm4 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    GroupBox1: TGroupBox;
    Button4: TButton;
    DBGrid1: TDBGrid;
    Image1: TImage;
    procedure Button4Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form4: TForm4;

implementation

uses dem, Unit6, Unit7;

{$R *.dfm}

procedure TForm4.Button4Click(Sender: TObject);
begin
close;
end;

procedure TForm4.Button2Click(Sender: TObject);
var bno:string;
begin

dm.mpl.Active:=false;
dm.mpl.CommandText:='select * from book ';
dm.mpl.active:=true;
dm.mpl.requery;

end;

procedure TForm4.Button1Click(Sender: TObject);
begin
form6.show;
end;

procedure TForm4.Button3Click(Sender: TObject);
begin
form7.show;
end;

end.