Arduino UNO, update data in MySQL table - mysql

Question

I need to update a record in a MySQL table with Arduino UNO. I want to send data from HC-SR06 sensor to db. Firstly I need to see whether a record is updated or not. I am using Ethernet shield and Arduino UNO.
Here is my Arduino source code:
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 177};
EthernetServer server(80);
String txData ="";
String wname = "sensor1";
void setup()
{
Serial.begin(9600);
Ethernet.begin(mac, ip);
server.begin();
}
void loop()
{
txData = "name="+ wname;
EthernetClient client = server.available();
if (client) {
delay (1000);
Serial.println(" client is ok-->");
boolean current_line_is_blank = true;
while (client.connected())
{
delay (1000);
Serial.println(" client connected-->");
if (client.available())
{
delay (1000);
Serial.println(" client available-->");
Serial.println("Connected to MySQL server. Sending data...");
client.print("POST /update_data.php HTTP/1.1\n");
client.print("Host: 192.168.1.177:80\n");
client.print("Connection: close\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(txData.length());
client.print("\n\n");
client.print(txData);
Serial.println("Successfull");
delay (1000);
}
}
delay(1);
client.stop();
}
}
Here is the update_data.php file:
<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
echo "dbconnect.php will run";
// Connect to MySQL
include("dbconnect.php");
// Prepare the SQL statement
$query = "update arduino.sensors SET value=1
where name = '$_POST[name]' ";
// Go to the review_data.php (optional)
//header("Location: review_data.php");
if(!#mysql_query($query))
{
echo "&Answer; SQL Error - ".mysql_error();
return;
mysql_close();
}
?>
Here is the dbconnect.php file:
<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
$Username = "root"; // enter your username for mysql
$Password = "1234"; // enter your password for mysql
$Hostname = "localhost"; // this is usually "localhost" unless your database resides on a different server
$Database = "arduino"; //database name
$dbh = mysql_connect($Hostname , $Username, $Password) or die (mysql_error());;
if (!$dbh){
die('MySQL ERROR: ' . mysql_error());
}
#mysql_select_db($Database) or die ('MySQL Error:'.mysql_error());
?>
Client is started and I see the logs on browser like this, bu sensor1 record is not updated.
name=sensor1POST /update_data.php HTTP/1.1
Host: 192.168.1.177:80
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 12

Answer 1

You are literally sending:
update arduino.sensors SET value=1
where name = '$_POST[name]'
to the database. Unless you have a sensor called $_POST[name] nothing will happen!
You need to send the value of variable $_POST[name] as a parameter. I suggest you research Prepared Statements, as building a query by concatenating strings is open to SQL injection attacks.