form4.frm

这是一个商品交易管理系统的代码

VERSION 5.00
Begin VB.Form Form4 
   BackColor       =   &H00C0C0C0&
   BorderStyle     =   1  'Fixed Single
   Caption         =   "登录"
   ClientHeight    =   3375
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   4860
   ForeColor       =   &H00000000&
   LinkTopic       =   "Form4"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   Picture         =   "Form4.frx":0000
   ScaleHeight     =   3375
   ScaleWidth      =   4860
   StartUpPosition =   2  '屏幕中心
   Begin VB.Data Data1 
      Caption         =   "Data1"
      Connect         =   "Access"
      DatabaseName    =   "商品交易.mdb"
      DefaultCursorType=   0  '缺省游标
      DefaultType     =   2  '使用 ODBC
      Exclusive       =   0   'False
      Height          =   375
      Left            =   960
      Options         =   0
      ReadOnly        =   0   'False
      RecordsetType   =   1  'Dynaset
      RecordSource    =   "系统信息"
      Top             =   2520
      Visible         =   0   'False
      Width           =   2415
   End
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   2520
      TabIndex        =   5
      Top             =   1920
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      BackColor       =   &H00C0C0C0&
      Caption         =   "登录"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   480
      TabIndex        =   4
      Top             =   1920
      Width           =   1455
   End
   Begin VB.TextBox Text2 
      DataField       =   "密码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      IMEMode         =   3  'DISABLE
      Left            =   2520
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1080
      Width           =   1695
   End
   Begin VB.TextBox Text1 
      DataField       =   "用户名"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   2520
      TabIndex        =   2
      Top             =   240
      Width           =   1695
   End
   Begin VB.Label Label3 
      Caption         =   "Label3"
      Height          =   15
      Left            =   3000
      TabIndex        =   6
      Top             =   600
      Width           =   135
   End
   Begin VB.Label Label2 
      BackStyle       =   0  'Transparent
      Caption         =   "输入密码"
      DataSource      =   "Data1"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   360
      TabIndex        =   1
      Top             =   1200
      Width           =   1695
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "输入用户名"
      DataSource      =   "Data1"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   360
      TabIndex        =   0
      Top             =   360
      Width           =   1815
   End
End
Attribute VB_Name = "Form4"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim micount As Integer
Private Sub Command1_Click()
Dim sqlstr As String
sqlstr = "select * from 系统信息 where 用户名='" & Text1.Text & "'"
Data1.RecordSource = sqlstr
Data1.Refresh
If Data1.Recordset.BOF Then
MsgBox "用户名错误,请重新输入!", vbCritical, "错误"
Text1.Text = " ": Text1.SetFocus
Else
If Data1.Recordset.Fields("密码") = Text2 Then
Unload Me
MDIForm1.Show
Else
MsgBox "密码错误，请重新输入！", vbCritical, "错误"
Text2.Text = "": Text2.SetFocus
End If
End If
micount = micount + 1
If micount = 3 Then
Unload Me
End If
End Sub

Private Sub Command2_Click()
Unload Me
Form2.Show
End Sub