frmlogin.frm

通过对空间数据的分析

VERSION 5.00
Begin VB.Form frmLogin 
   Caption         =   "用户登陆"
   ClientHeight    =   3345
   ClientLeft      =   60
   ClientTop       =   465
   ClientWidth     =   5115
   LinkTopic       =   "Form1"
   ScaleHeight     =   3345
   ScaleWidth      =   5115
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command3 
      Caption         =   "新用户"
      Height          =   495
      Left            =   3600
      TabIndex        =   7
      Top             =   1680
      Width           =   1215
   End
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   495
      Left            =   3600
      TabIndex        =   6
      Top             =   1080
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   495
      Left            =   3600
      TabIndex        =   5
      Top             =   480
      Width           =   1215
   End
   Begin VB.Frame Frame1 
      Caption         =   "登陆"
      Height          =   1815
      Left            =   120
      TabIndex        =   0
      Top             =   360
      Width           =   3135
      Begin VB.TextBox Text2 
         Height          =   375
         IMEMode         =   3  'DISABLE
         Left            =   1200
         PasswordChar    =   "*"
         TabIndex        =   4
         Top             =   840
         Width           =   1575
      End
      Begin VB.TextBox Text1 
         Height          =   375
         Left            =   1200
         TabIndex        =   3
         Top             =   360
         Width           =   1575
      End
      Begin VB.Label Label2 
         Caption         =   "密码"
         Height          =   495
         Left            =   240
         TabIndex        =   2
         Top             =   960
         Width           =   855
      End
      Begin VB.Label Label1 
         Caption         =   "用户名"
         Height          =   375
         Left            =   240
         TabIndex        =   1
         Top             =   480
         Width           =   855
      End
   End
End
Attribute VB_Name = "frmlogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim rs_user As New ADODB.Recordset
Private Sub Command1_Click()
  '首先检查用户是否输入了用户名和密码
    If Text1.Text = "" Then
       MsgBox "请输入用户名！", vbOKOnly + vbInformation, "注意"
       Text1.SetFocus
       Exit Sub
    ElseIf Text2.Text = "" Then
       MsgBox "请输入密码！", vbOKOnly + vbInformation, "注意"
       Text2.SetFocus
       Exit Sub
    End If
    Dim sqluser As String
    '构造查询该用户名和密码的sql语句
    sqluser = "select * from sjk where 用户名 = '" & Text1.Text _
    & "' and 密码 = '" & Text2.Text & "'"
    rs_user.CursorLocation = adUseClient
    '打开数据游标
    rs_user.open sqluser, conn, adLockPessimistic
    If rs_user.EOF = True Then
       MsgBox "用户名和密码不正确！", vbOKOnly + vbInformation, "注意"
       Text1.Text = ""
       Text2.Text = ""
       Text1.SetFocus
       rs_user.Close
       Exit Sub
    Else
       
       '提示用户登录成功并关闭游标和登录窗口
       MsgBox "登录成功！", vbOKOnly + vbInformation, "注意"
       rs_user.Close
       Unload Me
       frmMain.Show
    End If
End Sub

Private Sub Command2_Click()
   Text1.Text = ""
   Text2.Text = ""
End Sub

Private Sub Command3_Click()
  Unload Me
  frmAddUser.Show
End Sub

Private Sub Form_Load()
   Dim strCnn As String   '定义一个连接串变量
   Dim X0 As Long
   Dim Y0 As Long
   '让窗体居中
   X0 = Screen.Width
   Y0 = Screen.Height
   X0 = (X0 - Me.Width) / 2
   Y0 = (Y0 - Me.Height) / 2
   Me.Move X0, Y0
   
   ' 在窗体中打开对数据库的连接
   strCnn = "Provider=MSDASQL.1;Persist Security Info=False;Data Source=Sjk"
   conn.open strCnn
End Sub