使用PDO for PHP Xcode将数据插入MySQL

Question

I am really struggling trying to understand why the below code does not insert the date I am sending?

<?php
$servername = "servername";
$username = "username";
$password = "passwrd";
$dbname = "dbname";


$conn  = new PDO ("mysql:host=$servername;dbname=$dbname", $username, $password); 
$conn ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$Name = $_POST['Name'];
$Last = $_POST['Last'];
$email = $_POST['email'];
$pwd = $_POST['pwd'];
$userID = $_POST['userID'];

$sql = "INSERT INTO Users (Name, Last, email, password, userID) VALUES (:var1, :var2, :var3, :var4, :var5) "; 

$q = $conn -> prepare($sql);

$q -> execute (array(':var1' => $Name,
               ':var2' => $Last,
               ':var3' => $email,
               ':var4' => $pwd,
               ':var5' => $userID));

?>

If instead of

$Name = $_POST['Name']; 

and so on ... I hard code the values, so I might have:

$Name = 'Jane';

It adds the data to the database, but with $_POST, it fails at the execute line.

My Xcode looks like:

NSString *strURL = [NSString stringWithFormat:@"http://www.myserver/AddUser.php?Name=%@&Last=%@&email=%@&pwd=%@&userID=%@", Name, Last, email, pwd, userID];
NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];
NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];

I have gone through numerous tutorials and questions in SO and I can't see what the problem is.

Answer 1

It seems as though you're issuing a get request, not a post request, which means your $_POST is undefined, which is probably what's causing PDO's errors you're seeing. Instead, you should retrieve the values from the $_GET global variable:

$Name = $_GET['Name'];
$Last = $_GET['Last'];
$email = $_GET['email'];
$pwd = $_GET['pwd'];
$userID = $_GET['userID'];

Answer 2

Your HTTP request is being sent using the GET protocol, but you are accessing your data using the POST protocol. You have three potential fixes,

1. Change PHP to read data using GET

   $email = $_GET['email'];

2. Change PHP to be agnostic to mode (my preference)

   $email = $_REQUEST['email'];

3. Change your iPhone app to send using post.