unit2.pas

来自「学生档案管理系统,有登录模块」· PAS 代码 · 共 82 行

unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Label3: TLabel;
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    ADOQuery1: TADOQuery;
    ADOConnection1: TADOConnection;
    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 Unit5;

{$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.ShowModal;
    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人为删除或改名','无法打开数据库',0);
     application.Terminate;
 end;
end;

end.