systemlogon.frm

自测考试系统

VERSION 5.00
Begin VB.Form Form2 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "系统登陆"
   ClientHeight    =   2940
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   5280
   ControlBox      =   0   'False
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2940
   ScaleWidth      =   5280
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.ComboBox cmbtype 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   330
      Left            =   2040
      TabIndex        =   7
      Text            =   "Combo1"
      Top             =   1560
      Width           =   2055
   End
   Begin VB.TextBox txtpwd 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   2040
      PasswordChar    =   "*"
      TabIndex        =   6
      Text            =   "Text2"
      Top             =   960
      Width           =   2055
   End
   Begin VB.TextBox txtname 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2040
      TabIndex        =   5
      Text            =   "Text1"
      Top             =   240
      Width           =   2055
   End
   Begin VB.CommandButton cmdcancel 
      Caption         =   "退出"
      Height          =   375
      Left            =   2760
      TabIndex        =   4
      Top             =   2400
      Width           =   1215
   End
   Begin VB.CommandButton cmdok 
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   375
      Left            =   960
      TabIndex        =   3
      Top             =   2400
      Width           =   1215
   End
   Begin VB.Label Label3 
      Caption         =   "身份"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   720
      TabIndex        =   2
      Top             =   1680
      Width           =   975
   End
   Begin VB.Label Label2 
      Caption         =   "口令"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   720
      TabIndex        =   1
      Top             =   1080
      Width           =   975
   End
   Begin VB.Label Label1 
      Caption         =   "用户名"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   720
      TabIndex        =   0
      Top             =   360
      Width           =   975
   End
End
Attribute VB_Name = "Form2"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Const maxlogtimes As Integer = 3
Dim objadmin As Recordset
Dim objstudent As Recordset
Dim objteacher As Recordset

Private Sub cmdok_Click()
'静态的常量intlogtimes用于保存用户请求验证的次数
Static intlogtimes As Integer
intlogtimes = intlogtimes + 1
If intlogtimes > maxlogtimes Then
MsgBox "你已经超过允许的登陆验证次数！", vbCritical, "应用程序结束！", vbCritical, "登陆验证"
End
End If
'检验是否输入用户名
If Trim(txtname) = "" Then
msg "请输入用户名！", vbExclamation, "登陆验证"
txtname.SetFocus
Exit Sub
End If
'检验是否输入登陆口令
If Trim(txtpwd) = "" Then
MsgBox "请输入登陆口令！", vbExclamation, "登陆验证"
txtpwd = ""
txtpwd.SetFocus
Exit Sub
End If
'根据用户身份创建用于检验用户名和口令的合法性的recorset对象
Dim objlog As New Recordset
Select Case cmbtype
Case "学生"
      set objlog

End Sub

Private Sub Form_Load()
'清空用户名和口令文本框
txtname = ""
txtpwd = ""
'创建设分列表
cmbtype.AddItem "学生"
cmbtype.AddItem "教师"
cmbtype.AddItem "系统管理员"
cmbtype.ListIndex = 2
'创建与数据库的连接
Dim objcn As New Connection
With objcn
          .Provider = "sqloledb"
          .ConnectionString = "user id=sa;pse=123;data source=(local);" & _
          "initial catalog=自测系统"
          .Open
End With
'访问数据库获得管理员登陆信息
Set objadmin = New Recordset
With objadmin
.CursorLocation = adUseClient
.CursorType = adOpenStatic
.Open "select*from 管理员", objcn
Set .ActiveConnection = Nothing
End With
'访问数据库获得学生登陆信息
Set objstudent = New Recordset
With objstudent
.CursorLocation = adUseClient
.CursorType = adOpenStatic
.Open "select 学号,考号 from 学生信息", objcn
Set .ActiveConnection = Nothing
End With
'访问数据库获得教师登陆信息
Set objteacher = New Recordset
With objteacher
.CursorLocation = adUseClient
.CursorType = adOpenStatic
.Open "select 姓名,口令 from 阅卷教师", objcn
Set .ActiveConnection = Nothing
End With
objcn.Close
Set objcn = Nothing
End Sub