frmlogin.frm

VB类实现学生信息管理系统

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   3525
   ClientLeft      =   30
   ClientTop       =   330
   ClientWidth     =   5145
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3525
   ScaleWidth      =   5145
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Tag             =   "Login"
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   1800
      TabIndex        =   10
      Top             =   2400
      Width           =   2295
   End
   Begin VB.TextBox txtdb 
      Height          =   288
      IMEMode         =   3  'DISABLE
      Left            =   1800
      TabIndex        =   8
      Top             =   1920
      Width           =   2325
   End
   Begin VB.CommandButton cmdCancel 
      Cancel          =   -1  'True
      Caption         =   "取消"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   360
      Left            =   2520
      TabIndex        =   4
      Tag             =   "Cancel"
      Top             =   3000
      Width           =   1140
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "确定"
      Default         =   -1  'True
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   360
      Left            =   840
      TabIndex        =   3
      Tag             =   "OK"
      Top             =   3000
      Width           =   1140
   End
   Begin VB.TextBox txtPassword 
      Height          =   288
      IMEMode         =   3  'DISABLE
      Left            =   1788
      PasswordChar    =   "*"
      TabIndex        =   2
      Top             =   1488
      Width           =   2325
   End
   Begin VB.TextBox txtUserName 
      Height          =   288
      Left            =   1788
      TabIndex        =   1
      Top             =   1092
      Width           =   2325
   End
   Begin VB.Label lblLabels 
      Caption         =   "数据库类型"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Index           =   3
      Left            =   360
      TabIndex        =   9
      Top             =   2400
      Width           =   1320
   End
   Begin VB.Label lblLabels 
      Caption         =   "数据库"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Index           =   2
      Left            =   600
      TabIndex        =   7
      Top             =   1920
      Width           =   1080
   End
   Begin VB.Label Label1 
      Caption         =   "学生信息管理系统"
      BeginProperty Font 
         Name            =   "华文彩云"
         Size            =   22.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H80000002&
      Height          =   612
      Left            =   720
      TabIndex        =   6
      Top             =   240
      Width           =   3852
   End
   Begin VB.Label lblLabels 
      Caption         =   "用户密码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   252
      Index           =   1
      Left            =   588
      TabIndex        =   0
      Top             =   1500
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      Caption         =   "用户名"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   252
      Index           =   0
      Left            =   720
      TabIndex        =   5
      Tag             =   "&User Name:"
      Top             =   1116
      Width           =   840
   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 OK As Boolean
'记录确定次数
Dim miCount As Integer

Private Sub Form_Load()
    OK = False 'access to database
    miCount = 0
    Combo1.AddItem "access"
    Combo1.AddItem "oracle"
    Combo1.AddItem "sql_server"
End Sub



Private Sub cmdCancel_Click()
    OK = False
    Unload Me
End Sub


Private Sub cmdok_Click()
    Dim txtSQL As String
    
    Dim MsgText As String
    'ToDo: create test for correct password
    'check for correct password
    
    If Combo1.Text = "" Then
       db.db_type = "access"
    Else
       db.db_type = Combo1.Text 'other database
    End If
    
    
    If db.db_type <> "" Then  '不是access数据库
       
       If Trim(txtdb.Text) <> "" Then
           db.db_path = Trim(txtdb.Text) & ";"
       End If
    End If
    
    db.connect
    
    
    
    If Trim(txtUserName.Text = "") Then
        MsgBox "没有这个用户，请重新输入用户名！", vbOKOnly + vbExclamation, "警告"
        txtUserName.SetFocus
    Else
        login_user.user_Id = Trim(txtUserName.Text)
        login_user.query
         
          If login_user.State <> 1 Then
            MsgBox "没有这个用户，请重新输入用户名!", vbOKOnly + vbExclamation, "警告"
            txtUserName.SetFocus
          Else
            
            If login_user.user_pwd = DigestStrToHexStr(Trim(txtPassword.Text)) Then
                OK = True
                
                Me.Hide
               ' UserName = Trim(txtUserName.Text)
            Else
                MsgBox "输入密码不正确，请重新输入！", vbOKOnly + vbExclamation, "警告"
                txtPassword.SetFocus
                txtPassword.Text = ""
            End If
          End If
        
    End If
    
    
    miCount = miCount + 1
    If miCount = 3 Then
        Me.Hide
    End If
    Exit Sub
End Sub