A Simple PHP/MySQL Web Service for iOS - php

Question

Based on : http://www.raywenderlich.com/2941/how-to-write-a-simple-phpmysql-web-service-for-an-ios-app
My database looks like this : id | rw_promo_code_id | email_id | device_id | redeemed_time
I try this in the index.php:
// Check for required parameters
if (isset($_POST["rw_app_id"]) && isset($_POST["code"]) && isset($_POST["email_id"]) && isset($_POST["device_id"]) ) {
...........
// Add tracking of redemption
$stmt = $this->db->prepare("INSERT INTO rw_promo_code_redeemed (rw_promo_code_id, email_id, device_id) VALUES (?, ?, ?)");
$stmt->bind_param("is", $id, $email_id, device_id);
$stmt->execute();
$stmt->close();
IF I REMOVE && isset($_POST["device_id"]) and make this line
$stmt = $this->db->prepare("INSERT INTO rw_promo_code_redeemed
(rw_promo_code_id, email_id, device_id) VALUES (?, ?, ?)");
to
$stmt = $this->db->prepare("INSERT INTO rw_promo_code_redeemed
(rw_promo_code_id, email_id) VALUES (?, ?)");
I GET THE EMAIL CORRECTLY IN THE DATABASE OF COURSE, BUT NOT THE DEVICE ID
How can I get the the both values (device_id and email_id) to display in the database and not only one ?
I use this in the app (there is no problem with this)
NSString *emailadrress = email.text;
NSURL *url = [NSURL URLWithString:#"http://localhost:8888/"];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:#"1" forKey:#"rw_app_id"];
[request setPostValue:code forKey:#"code"];
[request setPostValue:emailadrress forKey:#"email_id"];
[request setPostValue:#"23131" forKey:#"device_id"];
[request setDelegate:self];
[request startAsynchronous];
EDIT : HERE IS THE ORGINAL FUNCTION:
function redeem() {
// Check for required parameters
if (isset($_POST["rw_app_id"]) && isset($_POST["code"]) && isset($_POST["device_id"])) {
// Put parameters into local variables
$rw_app_id = $_POST["rw_app_id"];
$code = $_POST["code"];
$device_id = $_POST["device_id"];
// Look up code in database
$user_id = 0;
$stmt = $this->db->prepare('SELECT id, unlock_code, uses_remaining FROM rw_promo_code WHERE rw_app_id=? AND code=?');
$stmt->bind_param("is", $rw_app_id, $code);
$stmt->execute();
$stmt->bind_result($id, $unlock_code, $uses_remaining);
while ($stmt->fetch()) {
break;
}
$stmt->close();
// Bail if code doesn't exist
if ($id <= 0) {
sendResponse(400, 'Invalid code');
return false;
}
// Bail if code already used
if ($uses_remaining <= 0) {
sendResponse(403, 'Code already used');
return false;
}
// Check to see if this device already redeemed
$stmt = $this->db->prepare('SELECT id FROM rw_promo_code_redeemed WHERE device_id=? AND rw_promo_code_id=?');
$stmt->bind_param("si", $device_id, $id);
$stmt->execute();
$stmt->bind_result($redeemed_id);
while ($stmt->fetch()) {
break;
}
$stmt->close();
// Bail if code already redeemed
if ($redeemed_id > 0) {
sendResponse(403, 'Code already used');
return false;
}
// Add tracking of redemption
$stmt = $this->db->prepare("INSERT INTO rw_promo_code_redeemed (rw_promo_code_id, device_id) VALUES (?, ?)");
$stmt->bind_param("is", $id, $device_id);
$stmt->execute();
$stmt->close();
// Decrement use of code
$this->db->query("UPDATE rw_promo_code SET uses_remaining=uses_remaining-1 WHERE id=$id");
$this->db->commit();
// Return unlock code, encoded with JSON
$result = array(
"unlock_code" => $unlock_code,
);
sendResponse(200, json_encode($result));
return true;
}
sendResponse(400, 'Invalid request');
return false;
}
EDIT: The error
PHP Warning: mysqli_stmt::bind_param() [<a
href='mysqli-stmt.bind-param'>mysqli-stmt.bind-param]:
Number of elements in type definition
string doesn't match number of bind
variables in
/Applications/MAMP/htdocs/index.php on
line 134
which is :
$stmt = $this->db->prepare("INSERT
INTO rw_promo_code_redeemed
(rw_promo_code_id, device_id,
email_id) VALUES (?, ?, ?)");
$stmt->bind_param("is", $id,
$device_id, $email_id);

Answer 1

got you...
you are missing value type for third variable.
$stmt = $this->db->prepare("INSERT INTO rw_promo_code_redeemed (rw_promo_code_id, device_id, email_id) VALUES (?, ?, ?)"); $stmt->bind_param("iss", $id, $device_id, $email_id);
change "is" to "iss" or "iis" any one required. you can get further info about bind_param on
http://www.php.net/manual/en/mysqli-stmt.bind-param.php