作为我正在整理的项目的一部分，我有一个 Arduino 通过 C♯ 更新 MySQL 数据库，并且在另一个位置我有另一个 C♯ 程序对数据库执行简单的 SELECT 查询，并通过将其发现传达给另一个 Arduino串行。我已经为第二个程序编写了大部分代码，但最后遇到了一些烦人的问题。
下面是代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using System.Xml;
using System.IO.Ports;
namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
string hkday;
string hkall;
//SERIAL
SerialPort serialPort1 = new SerialPort();
serialPort1.PortName = "COM4";
serialPort1.BaudRate = 9600;
serialPort1.NewLine = "\n";
//OPEN SERIAL
serialPort1.Open();
//SQL
string connString = "Server=xxxx;Uid=xxxx;Password=xxxx;Port=xxxx;Database=xxxx;";
MySqlConnection conn = new MySqlConnection(connString);
MySqlCommand command1 = conn.CreateCommand();
command1.CommandText = "Select USERS from HK where UPTIME='HKDAY'";
MySqlCommand command2 = conn.CreateCommand();
command2.CommandText = "Select USERS from HK where UPTIME='HKALL'";
//EXECUTE QUERIES
if (_continue = true)
{
conn.Open(); //Connect
MySqlDataReader reader1 = command1.ExecuteReader();
while (reader1.Read())
{
//Write to value and string
Console.WriteLine(reader1["USERS"].ToString());
hkday = reader1["USERS"].ToString();
}
Console.ReadLine();
_continue = false;
conn.Close(); //Disconnect
}
else
{
conn.Open(); //Connect
MySqlDataReader reader2 = command1.ExecuteReader();
while (reader2.Read())
{
//Write to console and string
Console.WriteLine(reader2["USERS"].ToString());
}
hkall = reader2["USERS"].ToString();
Console.ReadLine();
_continue = true;
conn.Close(); //Disconnect
//WRITE STRINGS TO SERIAL
serialPort1.WriteLine(
String.Format(hkday, hkall));
}
serialPort1.Close();
}
public static bool _continue { get; set; }
}
}
我无法弄清楚我的标题为 WRITE STRINGS TO SERIAL 的部分需要如何编写语法并将其放置在代码中才能引用“hkday”和“hkall”
我的 'if (_continue = true)' 标志似乎不起作用，我不知道为什么。
我认为如果解决了这两个问题，程序应该可以工作，你还能看到其他明显的问题吗？
谢谢，我知道这些只是小问题，但我似乎无法解决它们。
潜在重要：我正在尝试将输出设为 '123,456\n'，因为我的 arduino 程序已经将其识别为它的输入。
更新
收到我的答案后，我将这个项目与我目前正在做的另一个项目结合起来，尝试让 arduino 通过 C# 更新 MySQL 数据库，然后让它下载它没有更新的表数据以显示通过另一个arduino。
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.IO.Ports;
using MySql.Data.MySqlClient;
namespace SQL_Scraper
{
public partial class Sandro : Form
{
//Serial Settings
SerialPort UNO = new SerialPort("COM4", 9600);
SerialPort MEGA = new SerialPort("COM3", 9600);
//Incoming Data String
string RxString;
//Int for download
int? vnday = 0;
int? vnall = 0;
public Sandro()
{
InitializeComponent();
//Open UNO port
UNO.Open();
//Open MEGA Port
MEGA.Open();
}
private void MEGA_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
}
private void Sandro_FormClosing(object sender, FormClosingEventArgs e)
{
if (UNO.IsOpen | MEGA.IsOpen)
{
UNO.Close();
MEGA.Close();
}
}
private void DisplayText(object sender, EventArgs e)
{
}
private void Begin_Click(object sender, EventArgs e)
{
//Turn off start button
Begin.Enabled = false;
//?
this.Invoke(new EventHandler(DisplayText));
//Create Event Handler if data is receiverd
MEGA.DataReceived += new SerialDataReceivedEventHandler(MEGA_DataReceived);
string SQLString = "Server=benchmarkcount.db.9506323.hostedresource.com;Uid=benchmarkcount;Password=Watercress2428;Port=3306;Database=benchmarkcount;";
MySqlConnection SQLConnection = new MySqlConnection(SQLString);
//Receive data
RxString = MEGA.ReadExisting();
//Append Serial Input to Output box)
outputBox.AppendText(RxString);
//Get Unsaved input from text box
string input = outputBox.Text;
string[] inputLines = input.Split('\n');
//Upload findings from MEGA to SQL
foreach (string line in inputLines)
{
if (line.EndsWith("\r")) //Makes sure line is complete
{
if (line.StartsWith("Today's total users: "))
{
string dayUsers = line.Substring(20).Trim();
MySqlCommand UpdateHKDAY = SQLConnection.CreateCommand();
UpdateHKDAY.Parameters.AddWithValue("param1", dayUsers);
UpdateHKDAY.CommandText = "UPDATE HK SET USERS=?param1 WHERE UPTIME='HKDAY'";
SQLConnection.Open();
UpdateHKDAY.ExecuteNonQuery();
SQLConnection.Close();
}
else if (line.StartsWith("All-time total users: "))
{
string allUsers = line.Substring(21).Trim();
MySqlCommand UpdateHKALL = SQLConnection.CreateCommand();
UpdateHKALL.Parameters.AddWithValue("param2", allUsers);
UpdateHKALL.CommandText = "UPDATE HK SET USERS=?param2 WHERE UPTIME='HKALL'";
SQLConnection.Open();
UpdateHKALL.ExecuteNonQuery();
SQLConnection.Close();
}
}
}
//Only keep unparsed text in text box
outputBox.Text = inputLines[inputLines.Length - 1];
//Download Numbers Query
MySqlCommand DownUsers = new MySqlCommand("Select USERS, UPTIME from VN where UPTIME IN ('VNDAY', 'VNALL')", SQLConnection);
//Open Connection
SQLConnection.Open();
//Execute Downloading Numbers
MySqlDataReader theResults = DownUsers.ExecuteReader();
while (theResults.Read())
{
switch (theResults["UPTIME"] as string)
{
case "VNDAY":
vnday = theResults["USERS"] as int?;
break;
case "VNALL":
vnall = theResults["USERS"] as int?;
break;
}
}
//Do things with the results
UNO.WriteLine(String.Format("{0},{1}", vnday, vnall));
Console.WriteLine(String.Format("{0},{1}", vnday, vnall));
//Close Connection
SQLConnection.Close();
}
private void Sandro_Load(object sender, EventArgs e)
{
}
private void Cease_Click(object sender, EventArgs e)
{
Begin.Enabled = true;
Cease.Enabled = false;
}
}
}
但是，我希望能够在我的 inputBox 中检查这些数据——发送到 arduino 的数据，以确保它的格式为“vnday，vnall\n”