form1.frm

学生信息管理系统

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3375
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   6015
   LinkTopic       =   "Form1"
   ScaleHeight     =   3375
   ScaleWidth      =   6015
   StartUpPosition =   3  '窗口缺省
   Begin VB.Frame frmLogin 
      Caption         =   "登录"
      Height          =   1335
      Left            =   360
      TabIndex        =   3
      Top             =   1560
      Width           =   4935
      Begin VB.TextBox txtUser 
         Height          =   345
         Left            =   1080
         TabIndex        =   7
         Top             =   360
         Width           =   1485
      End
      Begin VB.TextBox txtPwd 
         Height          =   345
         IMEMode         =   3  'DISABLE
         Left            =   1080
         PasswordChar    =   "*"
         TabIndex        =   6
         Top             =   885
         Width           =   1485
      End
      Begin VB.CommandButton cmdOK 
         Caption         =   "确定"
         Default         =   -1  'True
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   390
         Left            =   3360
         TabIndex        =   5
         Top             =   360
         Width           =   1140
      End
      Begin VB.CommandButton cmdCancel 
         Cancel          =   -1  'True
         Caption         =   "取消"
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   390
         Left            =   3360
         TabIndex        =   4
         Top             =   840
         Width           =   1140
      End
      Begin VB.Label lblLabels 
         AutoSize        =   -1  'True
         Caption         =   "口令："
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   240
         Index           =   1
         Left            =   240
         TabIndex        =   9
         Top             =   915
         Width           =   765
      End
      Begin VB.Label lblLabels 
         AutoSize        =   -1  'True
         Caption         =   "用户名："
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   240
         Index           =   0
         Left            =   120
         TabIndex        =   8
         Top             =   360
         Width           =   900
      End
   End
   Begin VB.Frame fraUser 
      Caption         =   "选择身份"
      ForeColor       =   &H00000000&
      Height          =   975
      Left            =   360
      TabIndex        =   0
      Top             =   360
      Width           =   4935
      Begin VB.OptionButton optUserType 
         Caption         =   "教务管理人员"
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   255
         Index           =   0
         Left            =   600
         TabIndex        =   2
         Top             =   480
         Width           =   1935
      End
      Begin VB.OptionButton optUserType 
         Caption         =   "学生"
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   12
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   255
         Index           =   1
         Left            =   3000
         TabIndex        =   1
         Top             =   480
         Width           =   855
      End
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

'表示当前用户登录所选择的身份，即用户类型, 0-表示教务管理人员；1-表示学生
Dim mnUserType As Integer

Private Sub cmdcancel_Click()
   If MsgBox("你选择了退出系统登录，退出将不能启动管理系统！" & vbCrLf _
              & "是否真的退出？", vbYesNo, "登录验证") = vbYes Then
        Unload Me               '卸载登录窗体
    End If
End Sub

Private Sub cmdOK_Click()
    '取得用户输入的用户名和密码
    Dim user As String, pwd As String
    user = txtUser
    pwd = txtPwd
        
    '根据不同的身份，选择不同的表用以查询
    Dim r As New ADODB.Recordset
    Set r = DataEnv.rssqlSeek
    Dim strSQL As String
    Select Case mnUserType
        Case 0: '若身份为管理员
            strSQL = "select * from 用户表 where 用户名='" & user & "' and 密码='" & pwd & "'"
        Case 1: '若身份为学生
            strSQL = "select * from 学生表  where 学号='" & user & "' and  密码='" & pwd & "'"
    End Select
    
    On Error Resume Next
    '查询DataEnv.rssqlSeek的状态，如果已经打开，则先关闭
    If r.State = adStateOpen Then r.Close
    r.Open strSQL       '根据strSQL的内容刷新DataEnv.rssqlSeek
       
    '用户密码错误的次数，如果错误次数超过3次，则退出系统
    Static nTryCount As Integer
    
    If r.EOF Then   '登录失败
      MsgBox "对不起，无此用户或者密码不正确！请重新输入！！", vbCritical, "错误"
      txtUser.SetFocus
      txtUser.SelStart = 0
      txtUser.SelLength = Len(txtUser)
      nTryCount = nTryCount + 1
      If nTryCount >= 3 Then
         MsgBox "您无权操作本系统!再见！", vbCritical, "无权限"
         Unload Me
      End If
    Else            '登陆成功
      '显示MDI窗体, 并将用户类型和用户名传到MDI窗体中的mnUserType, msUserName中
      Load MDIMain
      With MDIMain
        .mnUserType = mnUserType
        .msUserName = pwd
        .Show
      End With
      Unload Me
    End If
End Sub



Private Sub Form_Load()
    optUserType(0).Value = True
End Sub

Private Sub optUserType_Click(Index As Integer)
    mnUserType = Index
End Sub