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vb點虐 登入頁面代碼 vb用戶登錄界面代碼

用vb點虐 ,后臺用access 做一個登錄窗口

建個模塊, Dim varcnn As OleDb.OleDbConnection ReadOnly Property cnn() As OleDb.OleDbConnection

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Get

If varcnn Is Nothing OrElse varcnn.State ConnectionState.Open Then Dim cnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=""" My.Application.Info.DirectoryPath "\Contact.mdb"";Persist Security Info=True"

varcnn = New OleDbConnection(cnstr)

varcnn.Open()

End If

Return varcnn

End Get

登錄窗體,新建一個就行了。代碼Public Class LoginForm1

Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click

Using cmd As New OleDb.OleDbCommand("select password from tbuser where userid =?", cnn)

cmd.Parameters.Add("?", OleDbType.VarChar).Value = Me.UsernameTextBox.Text

Dim obj As Object = cmd.ExecuteScalar

If (Not IsDBNull(obj)) AndAlso (obj IsNot Nothing) AndAlso obj = PasswordTextBox.Text Then

Me.DialogResult = Windows.Forms.DialogResult.OK

Else MessageBox.Show("密碼不正確!") Return

End If

End Using Me.Close()

End Sub Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel.Click

Me.DialogResult = Windows.Forms.DialogResult.Cancel

Me.Close()

End SubEnd Class 項目屬性里點查看應用程序事件,寫代碼Namespace My ' 以下事件可用于 MyApplication:

'

' Startup: 應用程序啟動時在創(chuàng)建啟動窗體之前引發(fā)。

' Shutdown: 在關閉所有應用程序窗體后引發(fā)。如果應用程序異常終止,則不會引發(fā)此事件。

' UnhandledException: 在應用程序遇到未處理的異常時引發(fā)。

' StartupNextInstance: 在啟動單實例應用程序且應用程序已處于活動狀態(tài)時引發(fā)。

' NetworkAvailabilityChanged: 在連接或斷開網絡連接時引發(fā)。

Partial Friend Class MyApplication

Private Sub MyApplication_Startup(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup

Dim f As New LoginForm1

If Not f.ShowDialog = DialogResult.OK Then

End

End If

End Sub End ClassEnd Namespace

你測試一下吧。

一個vb點虐 的用戶登陸頁面代碼

Private Sub Button _Click(ByVal sender As System Object ByVal e As System EventArgs) Handles Button Click

If TextBox Text = Or TextBox Text = Then

Label Text = 請確認您的輸入!

Return

End If

Dim sql As String = select * from pwd where stu_id=@stu_id and pwd=@pwd

Dim m As SqlCommand = New SqlCommand(sql conn)

m Parameters Add(New SqlParameter( @stu_id SqlDbType Int ))

m Parameters( @stu_id ) Value = TextBox Text

m Parameters Add(New SqlParameter( @pwd SqlDbType Char ))

m Parameters( @pwd ) Value = TextBox Text

Dim dr As SqlDataReader

conn Open()

dr = m ExecuteReader

If dr Read Then

Session( stu_id ) = TextBox Text

dr Close()

m Cancel()

Dim sql_ As String = update stu_base set point=point+ where stu_id=@stu_id

m = New SqlCommand(sql_ conn)

m Parameters Add(New SqlParameter( @stu_id SqlDbType Int ))

m Parameters( @stu_id ) Value = Session( stu_id )

m ExecuteNonQuery()

m Cancel()

Response Redirect( detail aspx?stu_id= Session( stu_id ) )

Else

Label Text = 您還沒有注冊或賬號密碼錯誤

End If

End Sub

Private Sub Button _Click(ByVal sender As System Object ByVal e As System EventArgs) Handles Button Click

TextBox Text =

TextBox Text =

lishixinzhi/Article/program/net/201311/13960

求一份VB.NET的注冊頁面的代碼

創(chuàng)建完相應的用戶名,密碼控件之后,輸入以下代碼:

Imports System.Data.OleDb

Public Class Form1

Private Sub cmdok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdok.Click

Dim m_username As String

Dim m_userpwd As String

Dim cmd_result As MsgBoxResult

Dim m_da As New OleDbDataAdapter

Dim m_ds As New DataSet

Dim m_command As New OleDbCommand

Dim strsql As String

m_username = txtusername.Text

m_userpwd = txtuserpwd.Text

strsql = " select * from user_info where username='" m_username "' and userpwd='" m_userpwd "'"

OleDbConnection1.Open()

m_command.CommandType = CommandType.Text

m_command.CommandText = strsql

m_command.Connection = OleDbConnection1

m_da.SelectCommand = m_command

m_da.Fill(m_ds, "user_info")

If m_ds.Tables("user_info").Rows.Count 0 Then

cmd_result = MsgBox("歡迎登錄", MsgBoxStyle.OKOnly, "提示")

Else

MsgBox("登錄失敗,請確認用戶名和密碼")

End If

End Sub

End Class


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