frmlogin.frm

用vb实现的图书管理系统

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Begin VB.Form frmLogin 
   Caption         =   "用户登陆"
   ClientHeight    =   4095
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   6180
   LinkTopic       =   "Form2"
   ScaleHeight     =   4095
   ScaleWidth      =   6180
   StartUpPosition =   3  '窗口缺省
   Begin MSAdodcLib.Adodc Adodc1 
      Height          =   330
      Left            =   2280
      Top             =   3840
      Visible         =   0   'False
      Width           =   2055
      _ExtentX        =   3625
      _ExtentY        =   582
      ConnectMode     =   0
      CursorLocation  =   3
      IsolationLevel  =   -1
      ConnectionTimeout=   15
      CommandTimeout  =   30
      CursorType      =   3
      LockType        =   3
      CommandType     =   8
      CursorOptions   =   0
      CacheSize       =   50
      MaxRecords      =   0
      BOFAction       =   0
      EOFAction       =   0
      ConnectStringType=   1
      Appearance      =   1
      BackColor       =   -2147483643
      ForeColor       =   -2147483640
      Orientation     =   0
      Enabled         =   -1
      Connect         =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Documents and Settings\ss\My Documents\book.mdb;Persist Security Info=False"
      OLEDBString     =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Documents and Settings\ss\My Documents\book.mdb;Persist Security Info=False"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   ""
      Password        =   ""
      RecordSource    =   ""
      Caption         =   "Adodc1"
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      _Version        =   393216
   End
   Begin VB.CommandButton Command2 
      Caption         =   "取消"
      Height          =   495
      Left            =   3120
      TabIndex        =   5
      Top             =   3000
      Width           =   1575
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   495
      Left            =   960
      TabIndex        =   4
      Top             =   3000
      Width           =   1575
   End
   Begin VB.TextBox txtPassword 
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   2640
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   2040
      Width           =   1815
   End
   Begin VB.TextBox txtUserName 
      Height          =   375
      Left            =   2640
      TabIndex        =   2
      Top             =   1440
      Width           =   1815
   End
   Begin VB.Label Label3 
      Caption         =   "图书馆管理系统"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1560
      TabIndex        =   6
      Top             =   480
      Width           =   2415
   End
   Begin VB.Label Label2 
      Caption         =   "密 码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   1320
      TabIndex        =   1
      Top             =   2160
      Width           =   975
   End
   Begin VB.Label Label1 
      Caption         =   "用户名"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   1320
      TabIndex        =   0
      Top             =   1560
      Width           =   975
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim strUserName As String
Dim strPassword As String
Dim conn As ADODB.Connection
Dim rsLogin As ADODB.Recordset
Dim strSQL As String

If Trim(txtUserName.Text) = "" Then
    MsgBox "“用户名”不能为空！"
    Exit Sub
Else
   strUserName = Trim(txtUserName.Text)
End If
If Trim(txtPassword.Text) = "" Then
   MsgBox "“口令”不能为空！"
   Exit Sub
Else
   strPassword = Trim(txtPassword.Text)
End If

Set conn = New ADODB.Connection

conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=book.mdb;Persist Security Info=False"
conn.Open

strSQL = "select*from UserInfo where Username = '"
strSQL = strSQL + strUserName + "' and Password='" + strPassword + "'"
Set rsLogin = conn.Execute(strSQL)
If rsLogin.EOF Or rsLogin.BOF Then
 MsgBox "用户名或口令错误，请检查！"
 txtPassword.SelStart = 0
 txtPassword.SelLength = Len(txtPassword.Text)
 txtPassword.SetFocus
 Else
 Unload Me
 If rsLogin.Fields(3).Value = "书籍操作员" Then
 frmMain.Show
 frmMain.MenuUserManager.Enabled = False
 End If
 If rsLogin.Fields(3).Value = "借阅操作员" Then
 frmMain.Show
 frmMain.MenuUserManager.Enabled = False
 frmMain.MenuBookManager.Enabled = False
 End If
 If rsLogin.Fields(3).Value = "管理员" Then
 frmMain.Show
 End If
 End If
  Set rsLogin = Nothing
 Set conn = Nothing
 End Sub

Private Sub Command2_Click()
Unload Me
End Sub