frmlogin.frm

大学数据库原理的课程设计

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   2370
   ClientLeft      =   2910
   ClientTop       =   2430
   ClientWidth     =   3960
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2370
   ScaleWidth      =   3960
   ShowInTaskbar   =   0   'False
   Begin MSAdodcLib.Adodc adoUser 
      Height          =   312
      Left            =   2400
      Top             =   2160
      Visible         =   0   'False
      Width           =   1452
      _ExtentX        =   2566
      _ExtentY        =   582
      ConnectMode     =   0
      CursorLocation  =   3
      IsolationLevel  =   -1
      ConnectionTimeout=   15
      CommandTimeout  =   30
      CursorType      =   3
      LockType        =   3
      CommandType     =   8
      CursorOptions   =   0
      CacheSize       =   50
      MaxRecords      =   0
      BOFAction       =   0
      EOFAction       =   0
      ConnectStringType=   1
      Appearance      =   1
      BackColor       =   -2147483643
      ForeColor       =   -2147483640
      Orientation     =   0
      Enabled         =   -1
      Connect         =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Stud97.mdb;Persist Security Info=False"
      OLEDBString     =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Stud97.mdb;Persist Security Info=False"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   ""
      Password        =   ""
      RecordSource    =   ""
      Caption         =   "Adodc1"
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      _Version        =   393216
   End
   Begin VB.CommandButton cmdCancel 
      Caption         =   "取消"
      Height          =   312
      Left            =   2003
      TabIndex        =   6
      Top             =   1800
      Width           =   1095
   End
   Begin VB.CommandButton cmdOk 
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   312
      Left            =   803
      TabIndex        =   5
      Top             =   1800
      Width           =   1095
   End
   Begin VB.TextBox txtPassword 
      Height          =   264
      IMEMode         =   3  'DISABLE
      Left            =   1344
      MaxLength       =   16
      PasswordChar    =   "#"
      TabIndex        =   4
      Text            =   "123456"
      Top             =   1200
      Width           =   2052
   End
   Begin VB.TextBox txtUserID 
      Height          =   264
      Left            =   1344
      MaxLength       =   16
      TabIndex        =   3
      Text            =   "ADMIN"
      Top             =   840
      Width           =   2052
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "用户密码"
      Height          =   180
      Left            =   504
      TabIndex        =   2
      Top             =   1248
      Width           =   720
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "用 户 名"
      Height          =   180
      Left            =   504
      TabIndex        =   1
      Top             =   888
      Width           =   732
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "学生信息管理系统"
      BeginProperty Font 
         Name            =   "华文彩云"
         Size            =   16.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   336
      Left            =   600
      TabIndex        =   0
      Top             =   240
      Width           =   2700
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'用户登录窗体frmLogin
Option Explicit
Dim Rs As ADODB.Recordset '定义记录集变量

Private Sub cmdCancel_Click()
    Unload Me
End Sub

Private Sub cmdOk_Click()
    Static intErr As Integer        '静态变量累加出错次数
    adoUser.Refresh                 '刷新记录集(关键语句)
    Set Rs = adoUser.Recordset      '设置记录集变量
    
    Rs.Find "用户名='" & txtUserID.Text & "'"
    If Not Rs.EOF Then              '若用户名正确
        '检查密码
        If Rs("密码") = txtPassword.Text Then '若密码正确
            gstrUser = txtUserID.Text         '存用户名
            If Rs("权限") = "管理员" Then     '存用户权限
                gblnPurview = True
            Else
                gblnPurview = False
            End If
            frmMain.Show                '显示主窗体
            Unload Me                   '卸载本窗体
        Else                            '若密码错误
            intErr = intErr + 1         '错误数+1
            If intErr = 3 Then          '若出错3次，退出系统
                Set Rs = Nothing
                Unload Me
            Else                    '若出错不足3次，重新输入
                MsgBox "密码输入错误，请重新输入！", vbExclamation
                With txtPassword    '焦点返回密码框
                    .SelStart = 0
                    .SelLength = Len(.Text)
                    .SetFocus
                End With
            End If
        End If
    Else                            '若用户名错误
        intErr = intErr + 1         '错误数+1
        If intErr = 3 Then          '若出错3次，退出系统
            Set Rs = Nothing
            Unload Me
        Else                        '若出错不足3次，重新输入
            MsgBox "用户名输入错误，请重新输入！", vbExclamation
            With txtUserID          '焦点返回用户框
                .SelStart = 0
                .SelLength = Len(.Text)
                .SetFocus
            End With
        End If
    End If
End Sub

Private Sub Form_Initialize()
    ChDrive App.Path
    ChDir App.Path
End Sub

Private Sub Form_Load()         '窗体加载
    cmdOk.Default = True        '“确定”按钮为回车键缺省按钮
    Dim sql As String
    sql = "SELECT * FROM 用户"  'SQL语句用于创建动态记录集
    adoUser.RecordSource = sql  '设置记录源为动态记录集
End Sub