如何通过数据库中的电子邮件编写查询更新数据库

Question

我在编码c时遇到问题，我需要通过使用Visual Studio在Arduino上读取序列来更新数据库中心跳的值，但是当我更新该值时，它将更新该值。数据库。

所以我的问题是我想如何通过电子邮件更新值？我不知道查询是通过电子邮件更新的。

我认为我需要更改此查询的代码：

database.updateQuery = $"UPDATE hbs SET hbvalue = '{heartBeat}'";

这是我的完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO.Ports;
using System.Threading;
using MySql.Data.MySqlClient;

namespace ReadSerial
{
    class Program
    {
        static SerialPort _serialPort;

        static void Main(string[] args)
        {
            //Serial port configuration
            _serialPort = new SerialPort();
            _serialPort.PortName = "COM3";//Set your board COM
            _serialPort.BaudRate = 9600;
            _serialPort.Open();

            while (true)
            {
                string heartBeat = _serialPort.ReadExisting();  //Read serial input

                Console.WriteLine($"Serial Read: {heartBeat}"); //print to console
                Thread.Sleep(1000);  //delay 1 second

                //update database
                DatabaseObject database = new DatabaseObject();
                database.updateQuery = $"UPDATE hbs SET hbvalue = '{heartBeat}'";
                database.UpdateDatabase();
                Console.WriteLine();
            }


        }


    }

    public class DatabaseObject
    {

        public string updateQuery = "";
        private MySql.Data.MySqlClient.MySqlConnection connection;
        private string server;
        private string database;
        private string user;
        private string password;
        private string port;
        private string connectionString;
        private string sslM;

        public void UpdateDatabase()
        {
            //Configure database connection
            server = "localhost"; //server IP address
            database = "heartbeat"; //database name
            user = "root"; //username
            password = ""; //password
            port = "3306"; //SQL port
            sslM = "none"; //SSL requirement

            connectionString = String.Format("datasource={0};port={1};username={2};password={3};database={4};SSL Mode={5}", server, port, user, password, database, sslM);

            connection = new MySql.Data.MySqlClient.MySqlConnection(connectionString);
            MySqlCommand command = new MySqlCommand(updateQuery, connection);
            command.CommandTimeout = 5;

            try
            {

                connection.Open();

                if (command.ExecuteNonQuery() == 1)
                {
                    Console.WriteLine("DATA UPDATED");
                }
                else
                {
                    Console.WriteLine("Data NOT UPDATED");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            connection.Close();
        }

    }
}