使用 C# 从 Arduino Serial 收集的数据进行 SQL 更新

Question

我正在尝试用 C# 编写一个简单的程序，该程序将读取通过串行连接的 Arduino 输出的数据，将相关数据从文本字符串中提取出来，这些文本字符串经过格式化以便在串行监视器中易于理解，显示两个只读文本框中的两条信息，充当计数器（每次更新信息时覆盖），并使用这些数字更新 SQL 表。

---

例子：

Arduino 输出：

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

C# 在 textbox1 中显示完整的消息

C# 在 textbox2 中显示 234231

C# 在 textbox3 中显示 433241

C# UPDATES SQL 表类似于：

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

但显然，'234231' 是一个变量，由 Arduino 的输入指定，然后通知 textbox2 的内容和更新 SQL 表所需的值。

---

我对 C# 很陌生，但到目前为止，我有一个程序可以从 Arduino 读取串行数据并将整个输出放入 textbox1，但仅此而已。

如何指定我想要分配给值的传入数据的一部分作为 textbox2（或 textbox3）中的文本输出，然后使用它来执行此操作并更新我保存的值SQL 表？

到目前为止我的代码是这样的：

    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)
        {

        }

    }
 }

正如您从“我的”专家评论中看到的，但编程无能，我正在使用出色教程 here 中的代码：而我的程序将有一个额外的按钮来开始 SQL 通信，当串行通讯已停止，并出现两个额外的文本框。

---

编辑：

输入格式为：

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

这样检查串行监视器的非程序员可以很容易地理解输出。第一行总是“有人起床”或“有人坐下”，在第二行，只有数字发生变化，第三行和第四行也是如此，但第三和第四行的数字（在这种情况相同，因为系统运行不到一天）是需要解析的。

---

编辑 2（新代码）：

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)
        {

        }

    }
}

---

EDIT 3（传入数据）：

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

如果您知道输入字符串始终采用相同的格式，并且数字始终为 6 位，您可以使用简单的子字符串：

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

否则你可以让解析更复杂一点：

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);
}

那么就只需要使用文本框中的数字和SQL查询即可：

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

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

编辑： 鉴于 textBox1 中有四行数据，您可以使用类似这样的方法来提取包含数字的字符串：

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();
}

编辑 2： TextBox1中可能不完整数据的代码解析建议：

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];
}