login.frm

超市管理系统,有课程设计电子文档

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "请登录"
   ClientHeight    =   2100
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   4695
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   1240.75
   ScaleMode       =   0  'User
   ScaleWidth      =   4408.349
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton cmdOK 
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   390
      Left            =   3480
      TabIndex        =   3
      Top             =   480
      Width           =   1020
   End
   Begin VB.CommandButton cmdCancel 
      Cancel          =   -1  'True
      Caption         =   "取消"
      Height          =   390
      Left            =   3480
      TabIndex        =   4
      Top             =   1200
      Width           =   1020
   End
   Begin VB.Frame fraLogin 
      Caption         =   "登录"
      Height          =   1935
      Left            =   120
      TabIndex        =   5
      Top             =   0
      Width           =   3015
      Begin VB.TextBox txtPwd 
         Height          =   345
         IMEMode         =   3  'DISABLE
         Left            =   1080
         PasswordChar    =   "*"
         TabIndex        =   1
         Top             =   900
         Width           =   1605
      End
      Begin VB.ComboBox cboUserType 
         Height          =   300
         ItemData        =   "Login.frx":0000
         Left            =   1080
         List            =   "Login.frx":0002
         Style           =   2  'Dropdown List
         TabIndex        =   2
         Top             =   1440
         Width           =   1605
      End
      Begin VB.TextBox txtUser 
         Height          =   345
         Left            =   1080
         TabIndex        =   0
         Top             =   360
         Width           =   1605
      End
      Begin VB.Label lblLabels 
         AutoSize        =   -1  'True
         Caption         =   "口令："
         Height          =   195
         Index           =   1
         Left            =   540
         TabIndex        =   8
         Top             =   975
         Width           =   540
      End
      Begin VB.Label lblLabels 
         AutoSize        =   -1  'True
         Caption         =   "选择身份："
         Height          =   180
         Index           =   2
         Left            =   180
         TabIndex        =   7
         Top             =   1500
         Width           =   900
      End
      Begin VB.Label lblLabels 
         AutoSize        =   -1  'True
         Caption         =   "用户名："
         Height          =   195
         Index           =   0
         Left            =   360
         TabIndex        =   6
         Top             =   435
         Width           =   720
      End
   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 Sub cmdCancel_Click()
    Unload Me
End Sub

Private Sub cmdOK_Click()
    On Error GoTo errHandler
     Set gConn = New ADODB.Connection  '数据库连接
    Dim strConn As String
    strConn = "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Supmarket;Data Source=(local);UID=Admin;PWD=111"
    gConn.Open strConn, "Admin", "111"

    Dim user As String, pwd As String  '登陆界面初始化
    user = txtUser
    pwd = txtPwd
    gnUserType = cboUserType.ListIndex
    gsUserName = user
    
    Dim strSQL As String
    strSQL = "select * from userlist where 用户名= '" & user & "' and 用户密码 ='" & pwd & "' and 用户类型=" & gnUserType
    Dim r As New ADODB.Recordset   '定义数据记录集
    r.Open strSQL, gConn, adOpenStatic
    Static nTryCount As Integer
    
        If r.EOF Then
      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
                gConn.Close
      End If
    Else
      Unload Me
      frmMain.Show
    End If
    r.Close
    
    Exit Sub
    
errHandler:
    MsgBox Err.Description, vbCritical, "错误"
End Sub

Private Sub Form_Load()
    cboUserType.Clear
    cboUserType.AddItem "管理人员", 0
    cboUserType.AddItem "仓管人员", 1
    cboUserType.AddItem "销售人员", 2
    
    
    cboUserType.ListIndex = 0
End Sub