登陆窗体.frm

VB图书管理系统

VERSION 5.00
Begin VB.Form 登陆窗体 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "林林图书管理系统登录"
   ClientHeight    =   1545
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   3750
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   Picture         =   "登陆窗体.frx":0000
   ScaleHeight     =   912.837
   ScaleMode       =   0  'User
   ScaleWidth      =   3521.047
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.TextBox txtUserName 
      Height          =   345
      Left            =   1290
      TabIndex        =   1
      Top             =   135
      Width           =   2325
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   390
      Left            =   495
      TabIndex        =   4
      Top             =   1020
      Width           =   1140
   End
   Begin VB.CommandButton cmdCancel 
      Cancel          =   -1  'True
      Caption         =   "取消"
      Height          =   390
      Left            =   2100
      TabIndex        =   5
      Top             =   1020
      Width           =   1140
   End
   Begin VB.TextBox txtPassword 
      Height          =   345
      IMEMode         =   3  'DISABLE
      Left            =   1290
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   525
      Width           =   2325
   End
   Begin VB.Label lblLabels 
      BackStyle       =   0  'Transparent
      Caption         =   "用户名称(&U):"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   300
      Index           =   0
      Left            =   105
      TabIndex        =   0
      Top             =   150
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      BackStyle       =   0  'Transparent
      Caption         =   "密码(&P):"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   420
      Index           =   1
      Left            =   105
      TabIndex        =   2
      Top             =   540
      Width           =   1080
   End
End
Attribute VB_Name = "登陆窗体"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Public LoginSucceeded As Boolean

Private Sub cmdCancel_Click()
    '设置全局变量为 false,不提示失败的登录
    LoginSucceeded = False
    Me.Hide
End Sub

Private Sub cmdOK_Click()
  Dim txtSQL As String '查询登陆帐号的sql语句
  Dim cnn As ADODB.Connection
  Dim rst As ADODB.Recordset
  
  If Trim(Me.txtUserName.Text = "") Then
    MsgBox "用户名不能为空！", vbOKOnly + vbExclamation, "警告"
    txtUserName.SetFocus
  Else
    Set cnn = New ADODB.Connection
    Set rst = New ADODB.Recordset
    cnn.Open "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=db1.mdb;"
    
    txtSQL = "select * from admin where adminuser = '" & txtUserName.Text & "'"
    rst.Open txtSQL, cnn, _
         adOpenKeyset, _
         adLockOptimistic
    If rst.EOF = True Then
      MsgBox "没有这个用户，请重新输入用户名!", vbOKOnly + vbExclamation, "警告"
      txtUserName.SetFocus
    Else
      If Trim(rst.Fields(1)) = Trim(txtPassword.Text) Then
        LoginSucceeded = True
        Me.Hide
        系统主窗体.Show
      Else
        MsgBox "输入密码不正确，请重新输入！", vbOKOnly + vbExclamation, "警告"
        txtPassword.SetFocus
        txtPassword.Text = ""
        SendKeys "{Home}+{End}"
      End If
    End If
  End If
End Sub