login.frm

用vb开发的图书馆管理系统

VERSION 5.00
Begin VB.Form login 
   Caption         =   "登录"
   ClientHeight    =   3975
   ClientLeft      =   60
   ClientTop       =   390
   ClientWidth     =   5565
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   ScaleHeight     =   3975
   ScaleWidth      =   5565
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   615
      Left            =   2400
      TabIndex        =   5
      Top             =   2880
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   615
      Left            =   960
      TabIndex        =   4
      Top             =   2880
      Width           =   1215
   End
   Begin VB.TextBox Text2 
      DataSource      =   "Adodc1"
      Height          =   615
      IMEMode         =   3  'DISABLE
      Left            =   2160
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1800
      Width           =   1815
   End
   Begin VB.TextBox Text1 
      DataSource      =   "Adodc1"
      Height          =   615
      Left            =   2160
      TabIndex        =   2
      Top             =   960
      Width           =   1815
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "密码"
      Height          =   540
      Left            =   960
      TabIndex        =   1
      Top             =   1920
      Width           =   840
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "用户名"
      Height          =   420
      Left            =   960
      TabIndex        =   0
      Top             =   1080
      Width           =   780
   End
End
Attribute VB_Name = "login"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

Option Explicit
Public userID As String
Public userpow As String
Dim cnt As Integer
Private Sub Command1_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 & "\database1.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 系统信息表 where 用户名='" & 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
     userID = Text1.Text
     If Trim(rs_login.Fields(1)) = Trim(Text2.Text) Then
       
        Unload Me
        Form1.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
Exit Sub
End Sub

Private Sub Command2_Click()
Unload Me
End Sub


Private Sub Form_Load()

cnt = 0
End Sub