frmlogin.frm

用VB编写的简单的学生成绩管理系统

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   1785
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   3750
   Icon            =   "frmLogin.frx":0000
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   1054.637
   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 labNote 
      Caption         =   "注意：登录成功后可修改密码"
      Height          =   255
      Left            =   480
      TabIndex        =   6
      Top             =   1560
      Width           =   3135
   End
   Begin VB.Label lblLabels 
      Caption         =   "用户名称(&U):"
      Height          =   270
      Index           =   0
      Left            =   105
      TabIndex        =   0
      Top             =   150
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      Caption         =   "登录密码(&P):"
      Height          =   270
      Index           =   1
      Left            =   105
      TabIndex        =   2
      Top             =   540
      Width           =   1080
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Public LoginSucceeded As Boolean
Dim objCn As Connection     '定义连接对象
Dim objSysLogin As Recordset
Private Sub cmdCancel_Click()
    LoginSucceeded = False '设置全局变量为 false，不提示失败的登录
    End     '我自己加的退出语句.
End Sub
Private Sub cmdOK_Click()   '检查正确的密码
    Set objCn = New Connection      '初始化连接对象
    With objCn
        .Provider = "SQLOLEDB"      '制定提供者
        .ConnectionString = "User ID=db4;PWD=lsc;Data Source=(local);" & _
        "Initial Catalog=成绩管理"
        .Open
    End With
    Set objSysLogin = New Recordset
    With objSysLogin
        Set .ActiveConnection = objCn
        .CursorLocation = adUseClient
        .CursorType = adOpenStatic
        .LockType = adLockOptimistic    '开放式记录锁定（逐条），只在调用Update方法时锁定记录。
        .Open "select * from Systemlogin"
    End With
    objSysLogin.MoveFirst
    If txtPassword = Trim(objSysLogin.Fields("pass")) And txtUserName = Trim(objSysLogin.Fields("user")) Then
        '将代码放在这里传递
        '设置全局变量时最容易的
        LoginSucceeded = True
        Me.Hide
        objCn.Close
        frmMain.Show
    Else
        MsgBox "无效的用户名或密码，请重试!", vbCritical, "登录"
        txtPassword.SetFocus
        SendKeys "{Home}+{End}"
    End If
End Sub