login.frm

次项目是一个用VB开发的图书管理系统

VERSION 5.00
Begin VB.Form login 
   Caption         =   "登录"
   ClientHeight    =   3075
   ClientLeft      =   60
   ClientTop       =   465
   ClientWidth     =   5280
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3075
   ScaleWidth      =   5280
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command2 
      Caption         =   "取 消"
      Height          =   495
      Left            =   2640
      TabIndex        =   5
      Top             =   1680
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "登 录"
      Height          =   495
      Left            =   1080
      TabIndex        =   4
      Top             =   1680
      Width           =   1215
   End
   Begin VB.TextBox Text2 
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   2160
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   960
      Width           =   1575
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   2160
      TabIndex        =   2
      Top             =   360
      Width           =   1575
   End
   Begin VB.Label Label2 
      Caption         =   "密 码："
      Height          =   375
      Left            =   1080
      TabIndex        =   1
      Top             =   1080
      Width           =   855
   End
   Begin VB.Label Label1 
      Caption         =   "用户名："
      Height          =   375
      Left            =   1080
      TabIndex        =   0
      Top             =   480
      Width           =   855
   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 cnt As Integer
Private Sub Command1_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
If Trim(Text1.Text) = "" Then
MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
Text1.SetFocus
Else
sql = "select * from 密码表 where 用户名='" & Text1.Text & "'"
rs_login.Open sql, conn, adOpenKeyset, adLockOptimistic
If rs_login.EOF = True Then
MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
Text1.SetFocus
Else
If Trim(rs_login.Fields(1)) = Trim(Text2.Text) Then
userID = Text1.Text
userpow = rs_login.Fields(2)
rs_login.Close
Formfrm.Show
Me.Hide
Else
MsgBox "密码不正确", vbOKOnly + vbExclamation, ""
Text2.SetFocus
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
Unload Formfrm
End Sub

Private Sub Form_Load()
Dim connectionString As String
connectionString = "provider=Microsoft.Jet.oledb.4.0;" & _
                   "data source=F:\系统制作\图书管理系统1\tushu.mdb"
conn.Open connectionString
cnt = 0
End Sub