frmlogin.frm

this is my first software.

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "登录"
   ClientHeight    =   1530
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   3990
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   1530
   ScaleWidth      =   3990
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton cmdCancel 
      Caption         =   "取消"
      Height          =   375
      Left            =   2520
      TabIndex        =   3
      Top             =   1080
      Width           =   975
   End
   Begin VB.CommandButton cmdOk 
      Caption         =   "登录"
      Default         =   -1  'True
      Height          =   375
      Left            =   720
      TabIndex        =   2
      Top             =   1080
      Width           =   975
   End
   Begin VB.TextBox txtPassword 
      Height          =   300
      IMEMode         =   3  'DISABLE
      Left            =   1320
      PasswordChar    =   "*"
      TabIndex        =   1
      Top             =   600
      Width           =   2415
   End
   Begin VB.TextBox txtUserName 
      Height          =   300
      Left            =   1320
      TabIndex        =   0
      Top             =   240
      Width           =   2415
   End
   Begin VB.Label Label2 
      Caption         =   "密码"
      Height          =   255
      Left            =   480
      TabIndex        =   5
      Top             =   645
      Width           =   735
   End
   Begin VB.Label Label1 
      Caption         =   "用户名"
      Height          =   255
      Left            =   480
      TabIndex        =   4
      Top             =   285
      Width           =   855
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private LoginSucceeded As Boolean           '记录是否登录成功


Private Sub cmdCancel_Click()
    '设置全局变量为 false
    '不提示失败的登录
    LoginSucceeded = False
    Unload Me
End Sub

Private Sub cmdOK_Click()
    
    userName = txtUsername.Text         '全局变量：记录当前用户的用户名
    userPassword = txtPassword.Text     '全局变量：记录当前用户的密码
    '检查正确的密码
    '在此处要从数据库中检索是否有这个用户，以及密码是否正确
    cn.Open
    Set rs = New ADODB.Recordset
    Set rs.ActiveConnection = cn
    rs.LockType = adLockReadOnly
    rs.CursorType = adOpenForwardOnly
    
    rs.Open "select * from 用户密码表 where 用户名 = '" & userName & "' and 密码 = '" & userPassword & "'"
    If rs.EOF Then
        LoginSucceeded = False
    Else
        userXingMing = rs!姓名          '全局变量：记录当前用户的姓名
        LoginSucceeded = True
    End If
   
    If LoginSucceeded = False Then
        '程序执行到此，说明一定没有登录成功
        MsgBox "无效的用户名或密码，请重试!", , "登录"
        txtUsername.SetFocus
        txtPassword.Text = ""
        SendKeys "{Home}+{End}"
    Else
        Me.Hide
    End If
    rs.Close
    cn.Close
    If LoginSucceeded = True Then
        Unload Me
        frmMain.Show
    End If
End Sub

Private Sub Form_Activate()
    txtUsername.Text = ""
    txtPassword.Text = ""
    txtUsername.SetFocus
    
    Set cn = New ADODB.Connection
    cn.ConnectionString = connectString
End Sub

Private Sub Form_Load()
    LoginSucceeded = False
End Sub