ESP8266到在线mysql数据库

如何解决ESP8266到在线mysql数据库

我试图将数据从带有LM35的ESP8266传输到在线MySQL数据库。我遵循了教程，但是没有用。

Arduino代码

#include <ESP8266WiFi.h>


const char* ssid = "ssid";
const char* password = "password";
const char* host = "ftp.jasperator.be";

const int sensor=A0; // Assigning analog pin A0 to variable 'sensor'
float tempc;  //variable to store temperature in degree Celsius
float tempf;  //variable to store temperature in Fahreinheit 
float vout;  //temporary variable to hold sensor reading

void setup()
{
  
Serial.begin(115200);

    // We start by connecting to a WiFi network

    Serial.println();
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);

    WiFi.begin(ssid,password);

    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());

    pinMode(sensor,INPUT); // Configuring pin A1 as input

}



void loop()
{
  
vout=analogRead(sensor);
vout=(vout*500)/1023;
tempc=vout; // Storing value in Degree Celsius
tempf=(vout*1.8)+32; // Converting to Fahrenheit 
Serial.print("in DegreeC=");
Serial.print("\t");
Serial.print(tempc);
Serial.println();
delay(1000); //Delay of 1 second for ease of viewing 
   
    Serial.print("connecting to ");
    Serial.println(host);

    // Use WiFiClient class to create TCP connections
    WiFiClient client;
    const int httpPort = 21;
    if (!client.connect(host,httpPort)) {
        Serial.println("connection failed");
        return;
    }

 


    // This will send the request to the server
 client.print(String("GET http://myserver.mysuffix/index.php?") + 
                          ("&realtime_data=") + tempc +
                          " HTTP/1.1\r\n" + 
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");
    unsigned long timeout = millis();
    while (client.available() == 0) {
        if (millis() - timeout > 1000) {  
            Serial.println(">>> Client Timeout !");
            client.stop();
            return;
        }
    }

    // Read all the lines of the reply from server and print them to Serial
    while(client.available()) {
        String line = client.readStringUntil('\r');
        Serial.print(line);
        
    }

    Serial.println();
    Serial.println("closing connection");    
} 

PHP代码

下一个代码是我的PHP文件，在这里我尝试获取温度传感器数据并将其放入我的在线数据库中。

$temperature = $_GET["tempc"];
        
$query = "INSERT INTO mydatabasename (realtime_data) VALUES ('$temperature')";
$conn->exec($query);
echo "Insertion Success!<br>";

我在ESP8266和我的互联网之间以及我的Web主机之间建立了连接，但是它只给我数据库中的空输入。