unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    ADOConnection1: TADOConnection;
    ADODataSet1: TADODataSet;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;
  Form2_close:Boolean;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
  Form2_close:=False;
  begin
  //檢驗(yàn)用戶名和密碼
  if ((Trim(edit1.Text)<>'') and (Trim(edit2.Text)<>'')) then
    begin
     Adoconnection1.Connected:=True;
     AdoDataset1.Active:=False;
     AdoDataset1.CommandText:='select * from Login where id='''+Trim(edit1.Text)+'''';
     AdoDataset1.Active:=True;
     if (Adodataset1.RecordCount<>0) then
       begin
         if Adodataset1.Fields[1].AsString=Trim(edit2.Text) then
             begin                                                                       //登陸成功
               Form2_close:=True;
               close;
             end
         else
               messagedlg('密碼錯(cuò)誤!',Mtwarning,[Mbok],0);
       end
     else
      messagedlg('用戶名錯(cuò)誤!',mtwarning,[Mbok],0);
    end
  else
     messagedlg('請(qǐng)輸入完整的用戶名和密碼!',mtwarning,[Mbok],0);
  end
end;

procedure TForm2.Button2Click(Sender: TObject);
begin
  application.Terminate;
end;

procedure TForm2.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if Form2_close then
    close
  else
    application.Terminate;

end;

end.


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