frmlogin.frm

学生信息管理系统

VERSION 5.00
Begin VB.Form frmLogin 
   Caption         =   "登录"
   ClientHeight    =   2850
   ClientLeft      =   3360
   ClientTop       =   2880
   ClientWidth     =   4725
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2850
   ScaleWidth      =   4725
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton cmdQuit 
      Caption         =   "退出"
      Height          =   420
      Left            =   2400
      Style           =   1  'Graphical
      TabIndex        =   6
      Top             =   2280
      Width           =   1095
   End
   Begin VB.CommandButton cmdLogin 
      Caption         =   "登陆"
      Height          =   420
      Left            =   1080
      Style           =   1  'Graphical
      TabIndex        =   5
      Top             =   2280
      Width           =   1095
   End
   Begin VB.Frame Frame1 
      Appearance      =   0  'Flat
      ForeColor       =   &H80000008&
      Height          =   1575
      Left            =   120
      TabIndex        =   0
      Top             =   600
      Width           =   4455
      Begin VB.TextBox txtPassword 
         Appearance      =   0  'Flat
         BackColor       =   &H80000018&
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   10.5
            Charset         =   134
            Weight          =   400
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         ForeColor       =   &H00000000&
         Height          =   350
         IMEMode         =   3  'DISABLE
         Left            =   1680
         PasswordChar    =   "*"
         TabIndex        =   4
         Top             =   960
         Width           =   2055
      End
      Begin VB.TextBox txtUserName 
         Appearance      =   0  'Flat
         BackColor       =   &H80000018&
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   10.5
            Charset         =   134
            Weight          =   400
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         ForeColor       =   &H00000000&
         Height          =   350
         Left            =   1680
         TabIndex        =   2
         Top             =   360
         Width           =   2055
      End
      Begin VB.Label Label2 
         AutoSize        =   -1  'True
         Caption         =   "密码："
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   12
            Charset         =   134
            Weight          =   400
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         ForeColor       =   &H00000000&
         Height          =   240
         Left            =   840
         TabIndex        =   3
         Top             =   1015
         Width           =   720
      End
      Begin VB.Label Label1 
         AutoSize        =   -1  'True
         Caption         =   "用户名："
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   12
            Charset         =   134
            Weight          =   400
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         ForeColor       =   &H00000000&
         Height          =   240
         Left            =   600
         TabIndex        =   1
         Top             =   415
         Width           =   960
      End
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "学生信息管理系统"
      BeginProperty Font 
         Name            =   "华文彩云"
         Size            =   22.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H80000002&
      Height          =   465
      Left            =   600
      TabIndex        =   7
      Top             =   120
      Width           =   3720
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'----------------------------------frmLogin.frm----------------------------------
Option Explicit

'登陆
Private Sub cmdLogin_Click()
    '声明ADODB.Recordset对象变量
    Dim objRecordset As ADODB.Recordset
    '声明SQL字符串
    Dim strSQL As String
    
    '查找用户名
    strSQL = "select UserName from Users where UserName='" & Trim(txtUserName.Text) & "'"
    '获得符合输入的用户记录集
    Set objRecordset = ExecuteSQL(strSQL)
    '如果输入的用户不存在
    If objRecordset.EOF = True Then
        MsgBox " 用户名错误！", vbExclamation + vbOKOnly, "警告"
        txtUserName.SetFocus
        txtUserName.SelStart = 0
        txtUserName.SelLength = Len(txtUserName.Text)
        Exit Sub
    End If
    
    '从数据库中获得用户名
    UserName = objRecordset.Fields(0)
    
    '查找用密码
    strSQL = "select UserName from Users where Password='" & Trim(txtPassword.Text) & "'"
    '获得符合输入的密码记录集
    Set objRecordset = ExecuteSQL(strSQL)
    '如果输入的密码不存在
    If objRecordset.EOF = True Or UserName <> objRecordset.Fields(0) Then
        MsgBox "密码错误！", vbExclamation + vbOKOnly, "警告"
        txtPassword.SetFocus
        txtPassword.SelStart = 0
        txtPassword.SelLength = Len(txtPassword.Text)
        Exit Sub
    End If
    
    '显示主界面
    mdiMain.Show
    '卸载登陆窗体
    Unload Me
End Sub

'退出登陆
Private Sub cmdQuit_Click()
    Unload Me
End Sub

'输入用户名
Private Sub txtUserName_KeyPress(KeyAscii As Integer)
    '输入回车表示输入结束，密码框获得焦点
    If KeyAscii = 13 Then
        txtPassword.SetFocus
    End If
End Sub

'输入密码
Private Sub txtPassword_KeyPress(KeyAscii As Integer)
    '输入回车表示输入结束，登陆按钮获得焦点
    If KeyAscii = 13 Then
        cmdLogin.SetFocus
    End If
End Sub