form9.frm

数据库在VB界面上的实现.如何实现数据库登陆界面、以何种形式登陆、销售系统界面等

VERSION 5.00
Begin VB.Form frmLogin 
   Caption         =   "Form1"
   ClientHeight    =   5055
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   6330
   LinkTopic       =   "from1"
   ScaleHeight     =   5055
   ScaleWidth      =   6330
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton cmdCancel 
      Caption         =   "取消"
      Height          =   375
      Left            =   3600
      TabIndex        =   7
      Top             =   3960
      Width           =   1695
   End
   Begin VB.CommandButton cmdLogin 
      Caption         =   "登录"
      Height          =   375
      Left            =   840
      TabIndex        =   6
      Top             =   3960
      Width           =   1455
   End
   Begin VB.Frame Frame1 
      Height          =   2175
      Left            =   360
      TabIndex        =   0
      Top             =   1560
      Width           =   5535
      Begin VB.TextBox txtPwd 
         Height          =   285
         IMEMode         =   3  'DISABLE
         Left            =   2160
         PasswordChar    =   "*"
         TabIndex        =   5
         Top             =   1200
         Width           =   2295
      End
      Begin VB.TextBox txtUser 
         Height          =   285
         Left            =   2160
         TabIndex        =   3
         Top             =   720
         Width           =   2295
      End
      Begin VB.Label Label3 
         Caption         =   "用户密码"
         Height          =   255
         Left            =   600
         TabIndex        =   4
         Top             =   1320
         Width           =   1335
      End
      Begin VB.Label Label2 
         Caption         =   "用户名称"
         Height          =   400
         Left            =   720
         TabIndex        =   2
         Top             =   720
         Width           =   1095
      End
   End
   Begin VB.Label label1 
      Caption         =   "                        销售管理信息系统"
      Height          =   615
      Left            =   480
      TabIndex        =   1
      Top             =   720
      Width           =   5415
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub cmdCancel_Click()
   Unload Me
End Sub

Private Sub cmdLogin_Click()
  If txtUser.Text = "" Then
    MsgBox "请填入用户姓名！", vbOKOnly + vbInformation, "注意"
    txtUser.SetFocus
    Exit Sub
    
  ElseIf txtPwd.Text = "" Then
    MsgBox "请填入用户密码！", vbOKOnly + vbInformation, "注意"
    txtPwd.SetFocus
    Exit Sub
  End If
   
   Dim rstUser As New ADODB.Recordset
   Dim sql As String
   sql = "select * from userdb where 用户名='" & txtUser.Text & "'and " & "密码='" & txtPwd.Text & "'"
   rstUser.Open sql, conn, adOpenDynamic, adLockPessimistic
   
   If rstUser.EOF = True Then
   MsgBox "用户名或密码错误,无法登录", vbOKOnly + vbExclamation, ""
   rstUser.Close
   Exit Sub
   Else
       MsgBox "正确登录", vbOKOnly + vbExclamation, ""
    MDIfrmMain.mnchpwd.Enabled = True
    MDIfrmMain.mntrade.Enabled = True
    MDIfrmMain.mnbuy.Enabled = True
    MDIfrmMain.mnsell.Enabled = True
    MDIfrmMain.mngrade.Enabled = True
    MDIfrmMain.mntable.Enabled = True
    rstUser.Close
    Unload Me
    End If
        
End Sub