使用C＃從Arduino串行收集的數據進行SQL更新

Question

我正在嘗試編寫一個簡單的C＃程序，它將讀取通過串行連接的Arduino的數據輸出，將相關數據從格式化為便於理解的文本字符串中移出串行監視器，並顯示兩個信息在兩個用作計數器的只讀文本框中（每次更新信息時都會覆蓋），並使用這些數字來更新SQL表。

---

例：

Arduino輸出：

'Day Users: 234231'
'All Users: 433241'

C＃在textbox1中顯示完整消息

C＃在textbox2中顯示234231

C＃在textbox3中顯示433241

C＃UPDATES SQL表類似於：

SqlCommand myCommand = new SqlCommand("UPDATE USER_NUMBERS
SET NUMBERZ= 234231 
WHERE UPTIME = DAYHK");

但是顯然，'234231'是一個變量，由Arduino的輸入指定，然后通知textbox2的內容和更新SQL表所需的值。

---

我是C＃的新手，但到目前為止，我有一個程序可以讀取Arduino的串行數據，並將整個輸出放入textbox1中，但僅此而已。

我如何在要分配給值的傳入數據中指定一部分作為textbox2（或textbox3）中的文本輸出，然后使用它來做這件事和更新SQL表中保存的值？

到目前為止，我的代碼是：

    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Serial_Reader
{
    public partial class Form1 : Form
    {

        string RxString;

        public Form1()
        {
            InitializeComponent();
        }

        private void buttonStart_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM3";
            serialPort1.BaudRate = 9600;

            serialPort1.Open();
            if (serialPort1.IsOpen)
            {
                buttonStart.Enabled = false;
                buttonStop.Enabled = true;
                buttonSQL.Enabled = true;
                textBox1.ReadOnly = false;
            }
        }

        private void buttonStop_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                serialPort1.Close();
                buttonStart.Enabled = true;
                buttonStop.Enabled = false;
                buttonSQL.Enabled = false;
                textBox1.ReadOnly = true;
            }
        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            // If the port is closed, don't try to send a character.

            if (!serialPort1.IsOpen) return;

            // If the port is Open, declare a char[] array with one element.
            char[] buff = new char[1];

            // Load element 0 with the key character.

            buff[0] = e.KeyChar;

            // Send the one character buffer.
            serialPort1.Write(buff, 0, 1);

            // Set the KeyPress event as handled so the character won't
            // display locally. If you want it to display, omit the next line.
            e.Handled = true;
        }

        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            RxString = serialPort1.ReadExisting();
            this.Invoke(new EventHandler(DisplayText));
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (serialPort1.IsOpen) serialPort1.Close();
        }

        private void DisplayText(object sender, EventArgs e)
        {
            textBox1.AppendText(RxString);
        }

        private void buttonSQL_Click(object sender, EventArgs e)
        {

        }

    }
 }

你可以從“我”擅長評論，但不稱職的節目中，我使用的代碼從輝煌教程看這里 ：和所有我的計划將有額外的一個按鈕，開始SQL通信，當串行通信被攔停，和兩個額外的文本框。

---

編輯 ：

輸入的格式為：

Someone got up from seat number 9
All-time users on seat number 9 is: 5
Today's total users: 17
All-time total users: 17

這樣，非程序員檢查串行監視器就可以輕松理解輸出。 第一行始終是“有人從那里站起來”或“有人坐下來”，在第二行上，只有數字改變了，在第三和第四行上又改變了，但是在第三和第四行上（這種情況是相同的，因為系統運行時間少於一天）是需要解析的系統。

---

編輯2 （新代碼）：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Serial_Reader
{
    public partial class Form1 : Form
    {

        string RxString;

        public Form1()
        {
              InitializeComponent();
        }

        private void buttonStart_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM3";
            serialPort1.BaudRate = 9600;

            serialPort1.Open();
            if (serialPort1.IsOpen)
            {
                buttonStart.Enabled = false;
                buttonStop.Enabled = true;
                buttonSQL.Enabled = true;
                textBox1.ReadOnly = true;
            }
        }

        private void buttonStop_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                serialPort1.Close();
                buttonStart.Enabled = true;
                buttonStop.Enabled = false;
                buttonSQL.Enabled = false;
                textBox1.ReadOnly = true;
            }
        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            // If the port is closed, don't try to send a character.

            if (!serialPort1.IsOpen) return;

            // If the port is Open, declare a char[] array with one element.
            char[] buff = new char[1];

            // Load element 0 with the key character.

            buff[0] = e.KeyChar;

            // Send the one character buffer.
            serialPort1.Write(buff, 0, 1);

            // Set the KeyPress event as handled so the character won't
            // display locally. If you want it to display, omit the next line.
            e.Handled = true;
        }

        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            RxString = serialPort1.ReadExisting();
            this.Invoke(new EventHandler(DisplayText));


        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (serialPort1.IsOpen) serialPort1.Close();
        }

        private void DisplayText(object sender, EventArgs e)
        {
            textBox1.AppendText(RxString);

        }

        private void buttonSQL_Click(object sender, EventArgs e)
        {
            //   SqlConnection myConnection = new SqlConnection("user id=username;" +
            //                            "password=password;server=serverurl;" +
            //                            "Trusted_Connection=yes;" +
            //                            "database=database; " +
            //                            "connection timeout=30");

            do
            {
                string dayUsers, allUsers;
                string s1 = "Today's total users: ";
                string s2 = "All-time total users: ";

                if (RxString.Contains(s1))
                {
                dayUsers = RxString.Replace(s1, "");
                textDU.Text = dayUsers;
           //     string queryDay = "UPDATE USER_NUMBERS SET NUMBERZ=" + dayUsers + "WHERE UPTIME=DAYHK";
                }

                if (RxString.Contains(s2))
                {
                allUsers = RxString.Replace(s2, "");
                textAU.Text = allUsers;
           //     string queryAll = "UPDATE USER_NUMBERS SET NUMBERZ=" + allUsers + "WHERE UPTIME=ALLHK";
                }
            }
            while (serialPort1.IsOpen);
        }



        private void textDU_TextChanged(object sender, EventArgs e)
        {

        }

        private void textAU_TextChanged(object sender, EventArgs e)
        {

        }

    }
}

---

編輯3 （傳入數據）：

if (abs (then [i] - now[i]) > THRESH)
{
  Serial.print ("Someone ");
  if (now [i] > then [i])
  {
    Serial.print ("sat on");
    allusers++;
    dayusers++;
    digitalWrite(counterPin, HIGH);  // hit counter
    delay(75);
    digitalWrite(counterPin, LOW);
    val[i]++;
  }  
  else
  {
    Serial.print ("got up from");
  }  
  Serial.print (" seat number ");
  Serial.println (i);
  Serial.print ("All-time users on seat number ");
  Serial.print (i);
  Serial.print (" is: ");
  Serial.println (val[i]); 
  Serial.print ("Today's total users: ");
  Serial.println (dayusers);
  Serial.print ("All-time total users: ");
  Serial.println (allusers);
}

Answer 1

如果您知道輸入字符串始終采用相同的格式，並且數字始終具有6位數字，則可以使用簡單的子字符串：

int dayUsers, allUsers;
Int32.TryParse(RxString.Substring(12, 6), out dayUsers);
Int32.TryParse(RxString.Substring(32, 6), out allUsers);

否則，您可以使解析更加復雜：

int dayUsers, allUsers;
string[] parts = RxString.Split('\'', ':');
if (parts.Length > 5)
{
    Int32.TryParse(parts[2].Trim(), out dayUsers);
    Int32.TryParse(parts[5].Trim(), out allUsers);
}

然后，只需使用文本框中的數字和SQL查詢即可：

textBox2.Text = dayUsers.ToString();
textBox3.Text = allUsers.ToString();

string query = "UPDATE USER_NUMBERS SET NUMBERZ=" + dayUsers + "WHERE UPTIME=DAYHK"

編輯：鑒於textBox1中有四行數據，您可以使用類似這樣的方法來提取包含數字的字符串：

string[] inputLines = textBox1.Text.Split('\n');
if (inputLines.Length == 4)
{
    string dayUsers = inputLines[2].Substring(inputLines[2].IndexOf(':') + 1).Trim();
    string allUsers = inputLines[3].Substring(inputLines[3].IndexOf(':') + 1).Trim();
}

編輯2：建議代碼解析TextBox1中的數據可能不完整：

private void buttonSQL_Click(object sender, EventArgs e)
{
    // Get unsaved input from text box
    string input = textBox1.Text;
    string[] inputLines = input.Split('\n');

    // Find and process relevant input
    foreach(string line in inputLines)
    {
        if (line.EndsWith("\r")) // Make sure line is complete
        {
            if (line.StartsWith("Today's total users: "))
            {
                string dayUsers = line.Substring(20).Trim();
                textDU.Text = dayUsers;
                // SQL query...
            }
            else if (line.StartsWith("All-time total users: "))
            {
                string allUsers = line.Substring(21).Trim();
                textAU.Text = allUsers;
                // SQL query...
            }
        }
    }

    // Only keep unparsed text in text box
    textBox1.Text = inputLines[inputLines.Length - 1];
}