登录.frm

初学vb,做的第一个系统.一个星期内看vb并做完这个系统的.

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Begin VB.Form login 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "登录"
   ClientHeight    =   2550
   ClientLeft      =   5565
   ClientTop       =   4365
   ClientWidth     =   4050
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   10.5
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   2550
   ScaleWidth      =   4050
   Begin VB.CommandButton Command3 
      Caption         =   "修改密码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   480
      TabIndex        =   6
      Top             =   1800
      Width           =   975
   End
   Begin MSAdodcLib.Adodc Adodc1 
      Height          =   375
      Left            =   120
      Top             =   2640
      Visible         =   0   'False
      Width           =   1200
      _ExtentX        =   2117
      _ExtentY        =   661
      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=MSDASQL.1;Persist Security Info=False;User ID=sa;Data Source=stu_manage;Initial Catalog=std_manage"
      OLEDBString     =   "Provider=MSDASQL.1;Persist Security Info=False;User ID=sa;Data Source=stu_manage;Initial Catalog=std_manage"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   "sa"
      Password        =   "manager"
      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"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1680
      TabIndex        =   5
      Top             =   1800
      Width           =   975
   End
   Begin VB.CommandButton Command1 
      Caption         =   "登录"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2880
      TabIndex        =   4
      Top             =   1800
      Width           =   975
   End
   Begin VB.TextBox Text2 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   1560
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1080
      Width           =   1455
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1560
      TabIndex        =   2
      Top             =   360
      Width           =   1455
   End
   Begin VB.Label Label2 
      Caption         =   "密  码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   600
      TabIndex        =   1
      Top             =   1080
      Width           =   735
   End
   Begin VB.Label Label1 
      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
      Height          =   255
      Left            =   600
      TabIndex        =   0
      Top             =   360
      Width           =   735
   End
End
Attribute VB_Name = "login"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

'登录
Private Sub Command1_Click()
    
    '声明用户名和密码变量
    Dim user As String, password As String

    '连接数据库
    Dim rs As New ADODB.Recordset
    Dim adoconn As New ADODB.Connection 'Connection 对象代表了打开与数据源的连接。
    adoconn.ConnectionString = Adodc1.ConnectionString 'Adodc1为窗体中的ADO控件，并已成功连接数据库
    adoconn.Open
    Set rs = New ADODB.Recordset
    rs.CursorLocation = adUseClient
    rs.CursorType = adOpenStatic
    rs.LockType = adLockBatchOptimistic
    
    '获取用户名和密码
    user = Text1.Text
    password = Text2.Text
    
    '检测用户名和密码的输入是否有空值
    If Len(user) = 0 Then
        MsgBox "请输入用户名！"
        Text1.Text = ""
        Text1.SetFocus
        Exit Sub
    ElseIf Len(password) = 0 Then
        MsgBox "请输入密码！"
        Text2.SetFocus
        Exit Sub
    End If
  
    '检测输入用户名和密码是否合法，若合法，则显示主界面；若非法，则重试
    rs.Open "select * from admin", adoconn
    rs.MoveFirst
    For i = 0 To rs.Fields.count - 1
        '若找到，则关闭本窗口，进入主界面
        If rs.Fields("id") = user And rs.Fields("pwd") = password Then
            rs.Close
            adoconn.Close
            Unload Me
            main.Show
            Exit Sub
        End If
        rs.MoveNext
    Next i
            
    'for循环结束，肯定没找到，也就是用户名或密码错误
    MsgBox "用户名或密码错误，请重试！"
    Text1.Text = ""
    Text2.Text = ""
    Text1.SetFocus
    rs.Close
    adoconn.Close
End Sub

'取消退出
Private Sub Command2_Click()
    End
End Sub
'修改密码
Private Sub Command3_Click()
    Unload Me
    change_password.Show
End Sub

Private Sub Command4_Click()
    Unload Me
    main.Show
End Sub