frmenter.frm

实现某班级的图书信息管理

VERSION 5.00
Begin VB.Form FrmEnter 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "图书管理系统"
   ClientHeight    =   3285
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   4815
   LinkTopic       =   "Form1"
   LockControls    =   -1  'True
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3285
   ScaleWidth      =   4815
   StartUpPosition =   3  'Windows Default
   Begin VB.Data DataEnter 
      Caption         =   "Data1"
      Connect         =   "Access"
      DatabaseName    =   ""
      DefaultCursorType=   0  'DefaultCursor
      DefaultType     =   2  'UseODBC
      Exclusive       =   0   'False
      Height          =   345
      Left            =   2400
      Options         =   0
      ReadOnly        =   0   'False
      RecordsetType   =   1  'Dynaset
      RecordSource    =   ""
      Top             =   -240
      Visible         =   0   'False
      Width           =   1455
   End
   Begin VB.CommandButton CmdExit 
      Caption         =   "退出"
      Height          =   375
      Left            =   2520
      TabIndex        =   3
      Top             =   2400
      Width           =   975
   End
   Begin VB.CommandButton CmdEnter 
      Caption         =   "登入"
      Height          =   375
      Left            =   1200
      TabIndex        =   2
      Top             =   2400
      Width           =   975
   End
   Begin VB.TextBox TxtPassword 
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   1560
      PasswordChar    =   "*"
      TabIndex        =   1
      Top             =   1440
      Width           =   1815
   End
   Begin VB.TextBox TxtUser 
      Height          =   375
      Left            =   1560
      TabIndex        =   0
      Top             =   840
      Width           =   1815
   End
   Begin VB.Label Label2 
      Caption         =   "密码"
      Height          =   375
      Left            =   840
      TabIndex        =   5
      Top             =   1560
      Width           =   495
   End
   Begin VB.Label Label1 
      Caption         =   "用户名"
      Height          =   375
      Left            =   840
      TabIndex        =   4
      Top             =   960
      Width           =   615
   End
End
Attribute VB_Name = "FrmEnter"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
 '************************************************************************
     '本窗本用于用户登陆，当三次密码不对就退出
 '*************************************************************************
Option Explicit
Private rsUserTable As Recordset
Private intcount As Integer
Private Sub CmdEnter_Click()
      
      If intcount >= 3 Then
            MsgBox "非法用户！", vbOKOnly + vbExclamation, ""
            Exit Sub
            End
       End If

       If TxtUser.Text = "" Or TxtPassword.Text = "" Then
            MsgBox "请输入用户名与密码！", vbOKOnly + vbInformation, ""
            Exit Sub
       End If
       
       With rsUserTable
            rsUserTable.FindFirst " username = '" & TxtUser & "'"
       If .NoMatch Then
            intcount = intcount + 1
            MsgBox "用户名不存在！", vbOKOnly + vbInformation, ""
            TxtUser.Text = ""
            TxtUser.SetFocus
            Exit Sub
       End If
       
            .FindFirst "password ='" & TxtPassword & "'"
       If .NoMatch Then
            intcount = intcount + 1
            
            MsgBox "密码输入不正确！", vbOKOnly + vbInformation, ""
            TxtPassword.Text = ""
            TxtPassword.SetFocus
            Exit Sub
                  
       End If
           
       End With
       username = TxtUser.Text
       userPassword = TxtPassword.Text
       
       Unload Me
       
       Load MDILibrary
       MDILibrary.Show
       
End Sub

Private Sub CmdRegister_Click()

End Sub

Private Sub CmdExit_Click()
    Unload Me
    
End Sub

Private Sub Form_GotFocus()
    TxtUser.SetFocus
End Sub

Private Sub Form_Load()
        Me.Left = (Screen.Width - Me.ScaleWidth) * 1 / 2
        Me.Top = (Screen.Height - Me.ScaleHeight) * 1 / 2
        InitializeDataPath
        DataEnter.DatabaseName = DataPath
        
        DataEnter.RecordSource = "select * from usertable"
        DataEnter.Refresh
        Set rsUserTable = DataEnter.Recordset
        
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Set rsUserTable = Nothing
    DataEnter.DatabaseName = ""
    
End Sub

Private Sub TxtPassword_KeyPress(KeyAscii As Integer)
     If KeyAscii = 13 Then
        If TxtPassword.Text <> "" Then
        
            CmdEnter_Click
        
        End If
    End If
End Sub

Private Sub TxtUser_KeyPress(KeyAscii As Integer)
    If KeyAscii = 13 Then
        If TxtUser.Text <> "" Then
        
            TxtPassword.SetFocus
        
        End If
    End If
End Sub