登陆界面.frm

学生信息管理系统

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3225
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5130
   ForeColor       =   &H00C0C000&
   Icon            =   "登陆界面.frx":0000
   LinkTopic       =   "Form1"
   ScaleHeight     =   3225
   ScaleWidth      =   5130
   StartUpPosition =   3  '窗口缺省
   Begin VB.Frame Frame1 
      Caption         =   "Frame1"
      Height          =   3495
      Left            =   -120
      TabIndex        =   0
      Top             =   -240
      Width           =   5295
      Begin VB.CommandButton command2 
         Caption         =   "取消"
         Height          =   375
         Left            =   2040
         TabIndex        =   8
         Top             =   2640
         Width           =   1095
      End
      Begin VB.CommandButton command3 
         Caption         =   "退出"
         Height          =   375
         Left            =   3720
         TabIndex        =   7
         Top             =   2640
         Width           =   1215
      End
      Begin VB.CommandButton command1 
         Caption         =   "登陆"
         Height          =   375
         Left            =   360
         TabIndex        =   6
         Top             =   2640
         Width           =   1095
      End
      Begin VB.TextBox text2 
         Height          =   375
         Left            =   1680
         TabIndex        =   5
         Text            =   "Text2"
         Top             =   1800
         Width           =   2055
      End
      Begin VB.TextBox text1 
         Height          =   390
         Left            =   1680
         TabIndex        =   3
         Text            =   "Text1"
         Top             =   1080
         Width           =   2055
      End
      Begin VB.Label Label3 
         Caption         =   "登陆密码"
         Height          =   255
         Left            =   600
         TabIndex        =   4
         Top             =   1800
         Width           =   855
      End
      Begin VB.Label Label2 
         Caption         =   "登陆名"
         Height          =   255
         Left            =   600
         TabIndex        =   2
         Top             =   1200
         Width           =   615
      End
      Begin VB.Label Label1 
         Caption         =   "学生数据库管理系统"
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   21.75
            Charset         =   134
            Weight          =   400
            Underline       =   0   'False
            Italic          =   -1  'True
            Strikethrough   =   0   'False
         EndProperty
         ForeColor       =   &H00808000&
         Height          =   495
         Left            =   600
         TabIndex        =   1
         Top             =   360
         Width           =   3975
      End
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Public ConStr As String

Private Sub Command1_Click()
If IsNAMELegit(Text1.Text) Then
    Dim recd As ADODB.Recordset
    Dim Source As String
    Set recd = New ADODB.Recordset
    Source = "Select 登陆密码 from 登陆 where 登陆名='" & Text1.Text & "'"
    recd.Open Source, ConStr, adOpenForwardOnly, adLockReadOnly
    If recd.BOF And recd.EOF Then
        MsgBox "请输入正确登陆名", vbInformation, "提示"
    Else
        If recd.Fields("登陆密码").Value = Text2.Text Then
                 MDIForm1.Enabled = True
                 MDIForm1.Visible = True
                 '进入系统
                 Unload Me
        Else
            MsgBox "密码错误", vbInformation, "提示"
            Text2 = ""
        End If
    End If
Else
End If
End Sub

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

Private Sub Command3_Click()
End
End Sub

Private Sub Form_Load()
ConStr = "Provider=SQLOLEDB.1;Password=315613;Persist Security Info=True;User ID=sa;Initial Catalog=wt;Data Source=wt"
Text1.Text = ""
Text2.Text = ""
Text2.PasswordChar = "*"
End Sub

Public Function GetNumString(ByVal num As Integer, ByVal length As Integer, ByRef str As String) As Boolean
'输入数字和字符串的长度，得到定长的字符串
str = ""
If num < 0 Or length < 0 Then
    GetNumString = False
    Exit Function
End If
str = num
If Len(str) > length Then
    str = ""
    GetNumString = False
    Exit Function
End If
While Len(str) < length
    str = str & "0"
Wend
GetNumString = True
End Function

Public Function IsNAMELegit(ByVal str As String) As Boolean
'检查输入的字符串是否存在恶意攻击SQL
If InStr(1, str, "'", vbTextCompare) Or Len(str) = 0 Or InStr(1, str, "%", vbTextCompare) Or InStr(1, str, "*", vbTextCompare) Then
    IsNAMELegit = False
    Exit Function
End If
IsNAMELegit = True
End Function