frmpass.frm

这是一个比较实用的图书馆管理系统的源代码。

VERSION 5.00
Begin VB.Form frmPass 
   Caption         =   "图书馆管理系统"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   2  'CenterScreen
   Begin VB.Frame Frame1 
      Caption         =   "用户登录"
      Height          =   1455
      Left            =   360
      TabIndex        =   2
      Top             =   840
      Width           =   3735
      Begin VB.TextBox Text1 
         Height          =   375
         Index           =   0
         Left            =   1080
         TabIndex        =   4
         Top             =   240
         Width           =   2055
      End
      Begin VB.TextBox Text1 
         Height          =   375
         IMEMode         =   3  'DISABLE
         Index           =   1
         Left            =   1080
         PasswordChar    =   "*"
         TabIndex        =   3
         Top             =   720
         Width           =   2055
      End
      Begin VB.Label Label2 
         Caption         =   "口　令"
         Height          =   375
         Index           =   1
         Left            =   360
         TabIndex        =   6
         Top             =   840
         Width           =   735
      End
      Begin VB.Label Label2 
         Caption         =   "用户名"
         Height          =   375
         Index           =   0
         Left            =   360
         TabIndex        =   5
         Top             =   360
         Width           =   735
      End
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   495
      Left            =   480
      TabIndex        =   1
      Top             =   2400
      Width           =   1575
   End
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   495
      Left            =   2400
      TabIndex        =   0
      Top             =   2400
      Width           =   1575
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      Caption         =   "图书馆管理系统"
      BeginProperty Font 
         Name            =   "黑体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   0
      TabIndex        =   7
      Top             =   120
      Width           =   4575
   End
End
Attribute VB_Name = "frmPass"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public n As Integer

Private Sub Command1_Click()
  Dim mrc As ADODB.Recordset
  Dim txtsql As String
  txtsql = "select * from oper where 用户名='" & Trim$(Text1(0).Text) & "'" & " And 口令='" & Trim$(Text1(1).Text) + "' "
  Set mrc = exesql(txtsql)
  If mrc.RecordCount = 0 Then   '没有找到用户记录
      n = n + 1
    If n < 3 Then
       MsgBox "没有这个用户，请继续登录", vbOKOnly + vbExclamation, "信息提示"
       Text1(0).Text = ""
       Text1(1).Text = ""
       Text1(0).SetFocus
    Else
       MsgBox "已经登录失败三次，退出系统！", vbOKOnly + vbExclamation, "信息提示"
       mrc.Close
       Unload Me
    End If
   Else       '找到合法用户
     userlevel = Trim(mrc.Fields("级别"))
     mrc.Close
     Unload Me
     frmMain.Show     '调用Main窗体
   End If
     
  
     
End Sub

Private Sub Command2_Click()
   Unload Me
End Sub

Private Sub Form_Load()
  n = 0     'n保存登录的次数
End Sub


Private Sub Text1_KeyPress(Index As Integer, KeyAscii As Integer)
   If KeyAscii = 13 And Index = 1 Then
      Command1_Click
    Else
      Call endData(KeyAscii)

   End If
End Sub