vb.net msaccess更新，请问有什么问题，为什么不更新我的数据库？

我不知道是什么问题， 有人能帮忙吗

我已经安装了运行程序所需的所有东西

Public Sub main1_Click(sender As Object, e As EventArgs) Handles main1.Click
    scorestanding.Text = standingscore
    provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source ="
    dataFile = "Database\user.mdb"
    connString = provider & dataFile
    myConnection.ConnectionString = connString
    myConnection.Open()
    Dim str As String

    str = "UPDATE login set[scorestand] = '" & scorestanding.Text & "'  Where [username] = '" & Label1.Text & "'"
    Dim cmd As OleDbCommand = New OleDbCommand(str, myConnection)

    Try
        cmd.CommandText = "UPDATE login set[scorestand] = '" & scorestanding.Text & "'  Where [username] = '" & Label1.Text
        cmd.ExecuteNonQuery()
        cmd.Dispose()
        myConnection.Close()
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
    Me.Close()
    main.Show()
End Sub

    str = "UPDATE login set[scorestand] = '" & scorestanding.Text & "'  Where [username] = '" & Label1.Text & "'"
    Dim cmd As OleDbCommand = New OleDbCommand(str, myConnection)

    Try
        cmd.CommandText = "UPDATE login set[scorestand] = '" & scorestanding.Text & "'  Where [username] = '" & Label1.Text
        cmd.ExecuteNonQuery()
        cmd.Dispose()
        myConnection.Close()
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
    Me.Close()
    main.Show()
End Sub

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它没有任何eror，但也不做任何操作。

设置断点-它们很友好，很好。你需要跨过这一步，看看它在哪里断裂。我可以告诉你有很多问题……如果没有错误，可能是where条件是故障点。创建一个变量，例如Dim Results为Integer=0，然后Results=cmd.ExecuteOnQuery。检查结果的值，如果不满足-1或0的where条件，而如果预期更新一条记录，则应返回1。另一方面，请考虑使用参数而不是为查询连接字符串。