unit2.pas

图书管理 很好。很好 ado 多用户不错

unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    XPMenu1: TXPMenu;
    Label3: TLabel;
    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 Unit5,unit6;

{$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);
 var
 mypath:string;
begin
MyPath:=ExtractFilePath(ParamStr(0));
  ADOConnection1.ConnectionString:='Provider=Microsoft.Jet.OLEDB.4.0;Data Source='+
  MyPath+'db1.mdb;Persist Security Info=False';

 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.