How I could modify webservice according to mysql modification - php

Question

I wrote this code as a web service that it returned json array could be by an android app .
How the app could parsed all data if there an addition in MySQL database during running the app.
<?php
ini_set('default_charset','UTF-8');
$servername = "localhost";
$username = "root";
$password = "passw";
$dbname = "db";
$conn = mysql_connect($servername, $username, $password,$dbname);
//fetch table rows from mysql db
$sql = "select * from t_name where id=1";
$result = mysql_query("SELECT ID from db.t_name where id =1" )
or die("Error in Selecting " . mysqli_error($connection));
//create an array
$emparray[] = array();
while($row =mysql_fetch_assoc($result))
{
$emparray[] = $row;
}
echo json_encode($emparray);
//close the db connection
mysql_close($conn);
?>

Answer 1

Android app will not get affected with additional columns added in yourable, but will defiantly get affected if you change the data type from int to var char or remove the column
The reason behind this is becasue the application will not be using your additional fields so it does not matters him if a few more columns are being added to it
it will only get affected if the columns it is using are not accessible either if you changed its datatype from int to some string or if they stop getting that particular field application will start getting error or crashes.