Question

我制作了一个MS Access DB表，并添加了Visual Basic以与Arduino一起使用。该表具有列（SerialNumber，Name，RFID_Number，Date / time，foodtype），我可以将arduino的RFID标签发送到Visual Basic Windows程序。那么我想知道如何使用来自Arduino的串行数据来比较表中的数据，例如：如果RFID数字与日期/时间匹配，然后向arduino发送命令以打开Serve1来给狗吃东西。

该程序使三只狗= D每天按时为他们提供食物。

我的问题是如何比较表DB中的变量。

这是我在Visual Basic中的全部代码，现在我可以从Arduino接收RFID编号了。

Imports System
Imports System.IO.Ports

Public Class Form1
Dim comPORT As String
Dim receivedData As String = ""

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    'TODO: This line of code loads data into the 'SpringdbDataSet.SpringData' table. You can move, or remove it, as needed.
    Timer1.Enabled = False
    comPORT = ""
    For Each sp As String In My.Computer.Ports.SerialPortNames
        comPort_ComboBox.Items.Add(sp)
    Next
    Me.SpringDataTableAdapter.Fill(Me.SpringdbDataSet.SpringData)
    SerialNumberTextBox.Clear()
    FullnameTextBox.Clear()
    RFIDTagTextBox.Clear()
    SpringSizeTextBox.Clear()
    OperationTimeDateTimePicker.Value = Now
End Sub

Private Sub PreBnt_Click(sender As Object, e As EventArgs) Handles PreBnt.Click
    SpringDataBindingSource.MovePrevious()
End Sub
Private Sub AddBnt_Click(sender As Object, e As EventArgs) Handles AddBnt.Click
    SpringDataBindingSource.AddNew()

End Sub
Private Sub SaveBnt_Click(sender As Object, e As EventArgs) Handles SaveBnt.Click
    Try
        SpringDataBindingSource.EndEdit()
        TableAdapterManager.UpdateAll(SpringdbDataSet)
        MsgBox("Success")

    Catch ex As Exception
        MsgBox("Error occur, please recheck the fields and try again.")
    End Try
End Sub

Private Sub DeleteBnt_Click(sender As Object, e As EventArgs) Handles DeleteBnt.Click
    SpringDataBindingSource.RemoveCurrent()
    TableAdapterManager.UpdateAll(SpringdbDataSet)
    MsgBox("Current Record Deleted")
End Sub


Private Sub NextBnt_Click(sender As Object, e As EventArgs) Handles NextBnt.Click
    SpringDataBindingSource.MoveNext()
End Sub

Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
    SpringDataBindingSource.Filter = "SerialNumber LIKE '%" & TextBox1.Text & "%'" & " OR Fullname LIKE '%" & TextBox1.Text & "%'"

End Sub

Private Sub comPort_ComboBox_SelectedIndexChanged(sender As Object, e As EventArgs) Handles comPort_ComboBox.SelectedIndexChanged
    If (comPort_ComboBox.SelectedItem <> "") Then
        comPORT = comPort_ComboBox.SelectedItem
    End If
End Sub

Private Sub connect_BTN_Click(sender As Object, e As EventArgs) Handles connect_BTN.Click
    If (connect_BTN.Text = "Connect") Then
        If (comPORT <> "") Then
            SerialPort1.Close()
            SerialPort1.PortName = comPORT
            SerialPort1.BaudRate = 9600
            SerialPort1.DataBits = 8
            SerialPort1.Parity = Parity.None
            SerialPort1.StopBits = StopBits.One
            SerialPort1.Handshake = Handshake.None
            SerialPort1.Encoding = System.Text.Encoding.Default 'very important!
            SerialPort1.ReadTimeout = 10000

            SerialPort1.Open()
            connect_BTN.Text = "Dis-connect"
            Timer1.Enabled = True
            Timer_LBL.Text = "Timer: ON"
        Else
            MsgBox("Select a COM port first")
        End If
    Else
        SerialPort1.Close()
        connect_BTN.Text = "Connect"
        Timer1.Enabled = False
        Timer_LBL.Text = "Timer: OFF"
    End If
End Sub

Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
    receivedData = ReceiveSerialData()
    RFIDTagTextBox.Text &= receivedData
End Sub
Function ReceiveSerialData() As String
    Dim Incoming As String
    Try
        Incoming = SerialPort1.ReadExisting()
        If Incoming Is Nothing Then
            Return "nothing" & vbCrLf
        Else
            Return Incoming
        End If
    Catch ex As TimeoutException
        Return "Error: Serial Port read timed out."
    End Try

End Function

Private Sub Timer_LBL_Click(sender As Object, e As EventArgs) Handles Timer_LBL.Click

End Sub

Private Sub RFIDTagTextBox_TextChanged(sender As Object, e As EventArgs) Handles RFIDTagTextBox.TextChanged

End Sub
End Class

如何比较Visual Basic数据库表中的变量

0 个答案: