unit2.pas

学生信息管理系统

unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

uses Unit3;

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
var
   u,p:string;
begin
   u:=edit1.Text;
   p:=edit2.Text;
   Adoquery1.Close;
   ADOQuery1.SQL.Clear;
   ADOQuery1.SQL.Add('select user,pass from denlu where user='+''''+u+''''+'and pass='+''''+p+'''');
   ADOQuery1.Open;
   if ADOQuery1.RecordCount=0 then
   begin
       Application.MessageBox('密码错误，请重新输入','提示',mb_ok);
       edit1.SetFocus;
   end
   else
      begin
      form2.hide;
      form5.Show;
      end;
end;

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

procedure TForm2.FormClose(Sender: TObject; var Action: TCloseAction);
begin
    application.Terminate;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin
   try
        ADOConnection1.open;
   except
        application.MessageBox('找不到数据库，引起该问题的原因是数据库文件可能被认为删除或改名。','无法打开数据库',0);
        application.Terminate;
   end;
end;

end.