Trying to connect from iOS to MySQL Database using php ( HTTP POST ) - php

Question

Below is my sample code for my PHP program, and my database has already been created.
createteam.php:
<?php
$response = array();
if($_SERVER['REQUEST_METHOD']=='POST'){
//getting values
$teamName = $_POST['name'];
$memberCount = $_POST['member'];
//including the db operation file
require_once '../includes/DbOperation.php';
$db = new DbOperation();
//inserting values
if($db->createTeam($teamName,$memberCount)){
$response['error']=false;
$response['message']='Team added successfully';
}else{
$response['error']=true;
$response['message']='Could not add team';
}
}else{
$response['error']=true;
$response['message']='You are not authorized';
}
echo json_encode($response);
config.php:
<?php
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_HOST', 'localhost');
define('DB_NAME', 'iphone');
DbConnect.php:
<?php
class DbConnect
{
private $conn;
function __construct()
{
}
/**
* Establishing database connection
* #return database connection handler
*/
function connect()
{
require_once 'Config.php';
// Connecting to mysql database
$this->conn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);
// Check for database connection error
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// returing connection resource
return $this->conn;
}
}
DbOperation.php:
<?php
class DbOperation
{
private $conn;
function __construct()
{
require_once dirname(__FILE__) . '/Config.php';
require_once dirname(__FILE__) . '/DbConnect.php';
// opening db connection
$db = new DbConnect();
$this->conn = $db->connect();
}
//Function to create a new user
public function createTeam($name, $memberCount)
{
$stmt = $this->conn->prepare("INSERT INTO team(name, member) values(?, ?)");
$stmt->bind_param("si", $name, $memberCount);
$result = $stmt->execute();
$stmt->close();
if ($result) {
return true;
} else {
return false;
}
}
}
However when I use HTTP POST method using Postman in Chrome, it states this
Notice: Undefined index: name in D:\xampp\htdocs\TestServ\api\createteam.php on line 9
Notice: Undefined index: member in D:\xampp\htdocs\TestServ\api\createteam.php on line 10
Warning: mysqli::__construct(): (HY000/1049): Unknown database 'iphone' in D:\xampp\htdocs\TestServ\includes\DbConnect.php on line 20
Failed to connect to MySQL: Unknown database 'iphone'
Warning: mysqli::prepare(): Couldn't fetch mysqli in D:\xampp\htdocs\TestServ\includes\DbOperation.php on line 20
Fatal error: Uncaught Error: Call to a member function bind_param() on null in D:\xampp\htdocs\TestServ\includes\DbOperation.php:21 Stack trace: #0 D:\xampp\htdocs\TestServ\api\createteam.php(18): DbOperation->createTeam(NULL, NULL) #1 {main} thrown in D:\xampp\htdocs\TestServ\includes\DbOperation.php on line 21
What does this mean, and what should I change?

Answer 1

Your first two errors are caused because of these two lines:
$teamName = $_POST['name'];
$memberCount = $_POST['member'];
The error (Undefined index) tells you that you have some non-existing variables, in this case name and member from your $_POST[] variable. Make sure your POST request is correctly made, see undefined variable for more information.
Your third error (Warning: mysqli::__construct(): (HY000/1049)) is caused because there isn't a database called iphone in your database system. Check if you have typed it correctly or if you haven't yet created an actual database with the name iphone.
The last error is caused because of the first two errors, since name and member aren't (correctly) defined in your POST request they have been set to NULL and the mysqli library doesn't like that.