frmlogin.frm

vb写的图书馆管理系统的源码

VERSION 5.00
Begin VB.Form frmLogin 
   Caption         =   "身份验证"
   ClientHeight    =   3645
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   5535
   LinkTopic       =   "Form1"
   ScaleHeight     =   3645
   ScaleWidth      =   5535
   StartUpPosition =   1  '所有者中心
   Begin VB.CommandButton cmdCancle 
      Caption         =   "取消"
      Height          =   495
      Left            =   3240
      TabIndex        =   5
      Top             =   2280
      Width           =   1335
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "确 定"
      Height          =   495
      Left            =   1080
      TabIndex        =   4
      Top             =   2280
      Width           =   1455
   End
   Begin VB.TextBox text2 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      IMEMode         =   3  'DISABLE
      Left            =   1800
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1440
      Width           =   3015
   End
   Begin VB.TextBox text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1800
      TabIndex        =   2
      Top             =   600
      Width           =   3015
   End
   Begin VB.Label Label3 
      Caption         =   "注意：如果您的身份验证三次未正确，系统将自动关闭！"
      ForeColor       =   &H000000FF&
      Height          =   255
      Left            =   360
      TabIndex        =   6
      Top             =   3000
      Width           =   5055
   End
   Begin VB.Label Label2 
      Caption         =   "密码："
      Height          =   375
      Left            =   600
      TabIndex        =   1
      Top             =   1560
      Width           =   1095
   End
   Begin VB.Label Label1 
      Caption         =   "用户名："
      Height          =   375
      Left            =   600
      TabIndex        =   0
      Top             =   720
      Width           =   1095
   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 cmdCancle_Click()
 Unload Me
End Sub

Private Sub cmdOK_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
Dim conn As New ADODB.Connection
conn.Open "provider=Microsoft.Jet.OLEDB.4.0; data source=" & App.Path & "\database.mdb"

 If Trim(Text1.Text) = "" Then
   MsgBox "用户名不能为空，请重新输入！"
   Text1.SetFocus
 Else
   sql = "select * from 用户表 where user_ID='" & Trim(Text1.Text) & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   If rs_login.EOF = True Then
     MsgBox "没有这个用户,请重输入！", vbOKOnly + vbExclamation, ""
     Text1.Text = ""
     Text1.SetFocus
   Else
     username = Text1.Text
     If Trim(rs_login.Fields(1)) = Trim(Text2.Text) Then
       
        Unload Me
        frmMain.Show
     Else
       MsgBox "密码不正确,请重输入！", vbOKOnly + vbExclamation, ""
        Text2.SetFocus
       Text2.Text = ""
     End If
   End If
 End If
 cnt = cnt + 1
 If cnt = 3 Then
  Unload Me
 End If
End Sub

Private Sub Form_Load()
cnt = 0

End Sub