frmlogin.frm

数据库中有三个默认用户。 用户名 密码权限 001 002 管理员 002 002 普通用户

VERSION 5.00
Begin VB.Form frmlogin 
   BackColor       =   &H0080FFFF&
   Caption         =   "登录"
   ClientHeight    =   4500
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   5760
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   4500
   ScaleWidth      =   5760
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton cmdcancel 
      Caption         =   "取消"
      Height          =   495
      Left            =   3000
      TabIndex        =   5
      Top             =   3000
      Width           =   1215
   End
   Begin VB.CommandButton cmdok 
      Caption         =   "确定"
      Height          =   495
      Left            =   720
      TabIndex        =   4
      Top             =   3000
      Width           =   1215
   End
   Begin VB.TextBox txtpwd 
      Height          =   495
      Left            =   2040
      TabIndex        =   3
      Top             =   1800
      Width           =   1695
   End
   Begin VB.TextBox txtname 
      Height          =   495
      Left            =   2040
      TabIndex        =   2
      Top             =   960
      Width           =   1695
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      BackColor       =   &H0080FFFF&
      Caption         =   "密码"
      Height          =   180
      Left            =   1320
      TabIndex        =   1
      Top             =   1800
      Width           =   360
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      BackColor       =   &H0080FFFF&
      Caption         =   "用户名"
      Height          =   180
      Left            =   1200
      TabIndex        =   0
      Top             =   960
      Width           =   540
   End
End
Attribute VB_Name = "frmlogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim cnt As Integer                     '记录确定次数

Private Sub cmdcancel_Click()
conn.Close
Set conn = Nothing
End
End Sub

Private Sub cmdok_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
If Trim(txtname.Text) = "" Then            '判断输入的用户名是否为空
   MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
   txtname.SetFocus
Else
   sql = "select * from 系统管理 where 用户名='" & txtname.Text & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   If rs_login.EOF = True Then
      MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
      txtname.SetFocus
   Else                                  '检验密码是否正确
      If Trim(rs_login.Fields(1)) = Trim(txtpwd.Text) Then
          userID = txtname.Text
          username = rs_login.Fields(2)
          rs_login.Close
          Unload Me
          MDIForm1.Show
      Else
         MsgBox "密码不正确", vbOKOnly + vbExclamation, ""
         txtpwd.SetFocus
      End If
   End If
End If
cnt = cnt + 1
If cnt = 3 Then
   Unload Me
End If
End Sub

Private Sub Form_Load()
Dim connectionstring As String
connectionstring = "provider=Microsoft.Jet.oledb.4.0;" & _
                   "data source= " & App.Path & "\zhongjie.mdb"
conn.Open connectionstring
cnt = 0
End Sub