login.pas

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unit Login;

interface

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

type
  Tloginform = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    ADOConnection1: TADOConnection;
    ADOTable1: TADOTable;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  loginform: Tloginform;

implementation
uses main,table;
{$R *.dfm}

procedure Tloginform.Button1Click(Sender: TObject);
begin
   if edit1.Text='' then
   showmessage('请填写用户名！')
   else
   begin
     if (edit1.Text=adotable1.FieldByName('name').AsString)  and
        (edit2.Text=adotable1.FieldByName('password').AsString) then
   begin
     close; 
   end
   else
   begin
     showmessage('请输入正确的用户名和密码！');
   end;
end;
end;

procedure Tloginform.Button2Click(Sender: TObject);
begin
  application.Terminate;
  form1.Close;
end;

procedure Tloginform.FormCreate(Sender: TObject);
begin
 adotable1.Close;
 adotable1.Open;
end;

end.