frmlogin.frm

图书馆管理系统的详细设计 功能齐全

VERSION 5.00
Begin VB.Form FrmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "用户登录"
   ClientHeight    =   2070
   ClientLeft      =   45
   ClientTop       =   540
   ClientWidth     =   4830
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2070
   ScaleWidth      =   4830
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  'CenterScreen
   Tag             =   "Login"
   Begin VB.CommandButton cmdCancel 
      Caption         =   "取消"
      Height          =   375
      Left            =   3720
      TabIndex        =   6
      Top             =   1440
      Width           =   735
   End
   Begin VB.CommandButton cmdLogin 
      Caption         =   "确认"
      Height          =   375
      Left            =   3720
      TabIndex        =   5
      Top             =   840
      Width           =   735
   End
   Begin VB.TextBox txtPassword 
      Height          =   285
      IMEMode         =   3  'DISABLE
      Left            =   1440
      PasswordChar    =   "*"
      TabIndex        =   4
      Top             =   1440
      Width           =   1695
   End
   Begin VB.TextBox txtUserName 
      Height          =   285
      Left            =   1440
      TabIndex        =   3
      Top             =   840
      Width           =   1695
   End
   Begin VB.Label Label3 
      Caption         =   "密    码："
      Height          =   255
      Left            =   480
      TabIndex        =   2
      Top             =   1440
      Width           =   735
   End
   Begin VB.Label Label2 
      Caption         =   "用户名："
      Height          =   255
      Left            =   480
      TabIndex        =   1
      Top             =   840
      Width           =   735
   End
   Begin VB.Line Line1 
      X1              =   240
      X2              =   4560
      Y1              =   600
      Y2              =   600
   End
   Begin VB.Label Label1 
      Caption         =   "请输入图书馆管理员账号及密码以登录："
      Height          =   255
      Left            =   240
      TabIndex        =   0
      Top             =   360
      Width           =   3855
   End
End
Attribute VB_Name = "FrmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public OK As Boolean

Private Sub cmdCancel_Click()
    OK = False
    Me.Hide
End Sub

Private Sub cmdLogin_Click()
    
    '检验数据的有效性
    If Trim(txtUserName.Text = "") Then
        MsgBox "请输入用户名！"
        txtUserName.SetFocus
        Exit Sub
    ElseIf Trim(txtPassword = "") Then
          MsgBox "请输入密码!"
          txtPassword.SetFocus
          Exit Sub
    Else
        Dim myDbOper As New DbOperation
        Dim rst As ADODB.Recordset
        Dim sql As String
        '建立连接
        myDbOper.DB_Connect
        '定义查询语句
        sql = "SELECT * FROM Librarian WHERE Id='" + txtUserName + "' AND Password='" + txtPassword + "'"
        Set rst = myDbOper.querySQL(sql)
        If (Not rst.EOF) Then
           OK = True
           Me.Hide
           FrmMain.Show 0
        Else
           MsgBox "用户名和密码错误,请重新输入."
        End If
        rst.Close
        '关闭连接
        myDbOper.DB_DisConnect
        
    End If
  
End Sub