login.frm

中北大学数据库课程设计

VERSION 5.00
Begin VB.Form login 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "图书管理系统 V1.0"
   ClientHeight    =   2445
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   4185
   Icon            =   "login.frx":0000
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2445
   ScaleWidth      =   4185
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   315
      Left            =   2400
      TabIndex        =   5
      Top             =   1950
      Width           =   690
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   315
      Left            =   960
      TabIndex        =   4
      Top             =   1950
      Width           =   690
   End
   Begin VB.TextBox txtpwd 
      Height          =   300
      IMEMode         =   3  'DISABLE
      Left            =   1200
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1425
      Width           =   2190
   End
   Begin VB.TextBox txtuser 
      Height          =   300
      Left            =   1200
      TabIndex        =   2
      Top             =   900
      Width           =   2190
   End
   Begin VB.Label Label3 
      Caption         =   "图书管理系统登陆"
      BeginProperty Font 
         Name            =   "文鼎新艺体简"
         Size            =   21.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00C00000&
      Height          =   615
      Left            =   300
      TabIndex        =   6
      Top             =   225
      Width           =   3765
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "密码"
      Height          =   180
      Left            =   450
      TabIndex        =   1
      Top             =   1500
      Width           =   360
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "用户名:"
      Height          =   180
      Left            =   375
      TabIndex        =   0
      Top             =   975
      Width           =   630
   End
End
Attribute VB_Name = "login"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim n As Integer

Private Sub Command1_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
If Trim(txtuser.Text) = "" Then
   MsgBox "", vbOKOnly + vbExclamation, ""
   txtuser.SetFocus
Else
   sql = "select * from 系统管理 where 用户名='" & txtuser.Text & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   If rs_login.EOF = True Then
      MsgBox "用户名不存在", vbOKOnly + vbExclamation, ""
      txtuser.SetFocus
   Else
      If Trim(rs_login.Fields(1)) = Trim(txtpwd.Text) Then
          userID = txtuser.Text
          userpow = rs_login.Fields(2)
          rs_login.Close
          Unload Me
          Form1.Show
      Else
         MsgBox "密码错误", vbOKOnly + vbExclamation, ""
         txtpwd.SetFocus
      End If
   End If
End If
n = n + 1
If n = 3 Then
   Unload Me
End If
Exit Sub
End Sub

Private Sub Command2_Click()
Unload Me
End Sub

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