PHP : return last inserted Id on statement - php

Question

So I want to get and return last inserted id from query.
I am successfully get the last inserted id but I have a little problem when try to return it to index.php file
This is my method code :
public function InsertUserCard(UserCard $uc)
{
if(!$this->DuplicateUserCard($uc))
{
$stmt = $this->conn->prepare("INSERT INTO ".$this->table_name."
(user_id, card_id, barcode, barcode_format, created_at, updated_at)
VALUES(?, ?, ?, ?, ?, ?)");
if ($stmt == FALSE)
{
die($this->conn->error);
}
else
{
$user_id = NULL;
$card_id = NULL;
$barcode = NULL;
$barcode_format = NULL;
$created_at = NULL;
$updated_at = NULL;
$stmt->bind_param("iissss", $user_id, $card_id, $barcode, $barcode_format, $created_at, $updated_at);
$user_id = $uc->getUserId();
$card_id = $uc->getCardId();
$barcode = $uc->getBarcode();
$barcode_format = $uc->getBarcodeFormat();
$created_at = $uc->getCreatedAt();
$updated_at = $uc->getUpdatedAt();
$stmt->execute();
$result = $this->conn->insert_id; <-- This is how I get the last inserted id
$stmt->close();
}
// Check for successful insertion
if ($result)
{
// User card successfully inserted
return USER_CARD_INSERTED_SUCCESSFULLY;
}
else
{
// Failed to insert user card
return USER_CARD_INSERT_FAILED;
}
}
else
{
return USER_CARD_ALREADY_EXISTED;
}
}
and this is my index.php file
$app->post('/user/card/rev', 'authenticate', function() use ($app)
{
// check for required params
verifyRequiredParams(array('user_id', 'card_id', 'barcode', 'barcode_format', 'created_at', 'updated_at'));
global $user_id;
$response = array();
$timestamp = time();
$now = date("Y-m-d H:i:s", $timestamp);
$uc = new UserCard();
$uc->setUserId($user_id);
$uc->setCardId($app->request->post('card_id'));
$uc->setBarcode($app->request->post('barcode'));
$uc->setBarcodeFormat($app->request->post('barcode_format'));
$uc->setCreatedAt($app->request->post('created_at'));
$uc->setUpdatedAt($app->request->post('updated_at'));
// choose card from db by user
$UserCardDB = new UserCardDB(MySqlDb::getInstance()->connect());
$UserCard = $UserCardDB->InsertUserCard($uc);
if ($UserCard == USER_CARD_INSERTED_SUCCESSFULLY)
{
$response["error"] = false;
$response["message"] = "User Card added successfully";
$response["current_timestamp"] = $timestamp;
$response["current_date"] = $now;
$response["last_inserted_id"] = SHOULD_BE_HERE;
echoRespnse(201, $response);
}
});
as you see, I want to put the last inserted id on $response["last_inserted_id"], but I do not know how to do it.
any ideas ?
thanks:)

Answer 1

I think you have your statements backwards
$inserted_id = $this->conn->insert_id;
$result = $stmt->execute();
In prepared statements, execute is what runs your SQL. So you can't get the ID of what hasn't been inserted yet.
$result = $stmt->execute();
$inserted_id = $this->conn->insert_id;
You're also not storing the data anywhere usable ($inserted_id is a local variable to your function). Consider making a class variable like $this->inserted_id and making a function that would return that value.

Answer 2

Try this in you method:
public function InsertUserCard(UserCard $uc)
{
if(!$this->DuplicateUserCard($uc))
{
$stmt = $this->conn->prepare("INSERT INTO ".$this->table_name."
(user_id, card_id, barcode, barcode_format, created_at, updated_at)
VALUES(?, ?, ?, ?, ?, ?)");
if ($stmt == FALSE)
{
die($this->conn->error);
}
else
{
$user_id = NULL;
$card_id = NULL;
$barcode = NULL;
$barcode_format = NULL;
$created_at = NULL;
$updated_at = NULL;
$stmt->bind_param("iissss", $user_id, $card_id, $barcode, $barcode_format, $created_at, $updated_at);
$user_id = $uc->getUserId();
$card_id = $uc->getCardId();
$barcode = $uc->getBarcode();
$barcode_format = $uc->getBarcodeFormat();
$created_at = $uc->getCreatedAt();
$updated_at = $uc->getUpdatedAt();
}
// Check for successful insertion
if ($stmt->execute())
{
$result = $this->conn->insert_id;
$stmt->close();
return $result;
}
else
{
// Failed to insert user card
return USER_CARD_INSERT_FAILED;
}
}
else
{
return USER_CARD_ALREADY_EXISTED;
}
}
and in you index.php:
$app->post('/user/card/rev', 'authenticate', function() use ($app)
{
// check for required params
verifyRequiredParams(array('user_id', 'card_id', 'barcode', 'barcode_format', 'created_at', 'updated_at'));
global $user_id;
$response = array();
$timestamp = time();
$now = date("Y-m-d H:i:s", $timestamp);
$uc = new UserCard();
$uc->setUserId($user_id);
$uc->setCardId($app->request->post('card_id'));
$uc->setBarcode($app->request->post('barcode'));
$uc->setBarcodeFormat($app->request->post('barcode_format'));
$uc->setCreatedAt($app->request->post('created_at'));
$uc->setUpdatedAt($app->request->post('updated_at'));
// choose card from db by user
$UserCardDB = new UserCardDB(MySqlDb::getInstance()->connect());
$UserCard = $UserCardDB->InsertUserCard($uc);
if (($UserCard != "USER_CARD_INSERT_FAILED") and ($UserCard != "USER_CARD_ALREADY_EXISTED"))
{
$response["error"] = false;
$response["message"] = "User Card added successfully";
$response["current_timestamp"] = $timestamp;
$response["current_date"] = $now;
$response["last_inserted_id"] = $UserCard;
echoRespnse(201, $response);
}
});

Answer 3

The way I read that, your // Check for successful insertion section will never run because the function is terminated with return $result; before the conditional. Therefore, USER_CARD_INSERTED_SUCCESSFULLY is never returned.

Answer 4

In my functions, I usually return an array, for example:
$result = array( "status" => $status, "id" => $id );
return $result;
and, in the main:
$result = my_function();
$status = $result['status'];
$id = $result['id'];
I hope this help you!

Answer 5

In your method code instead of using $inserted_id use a $_SESSION variable $_SESSION['inserted_id']. Now you will be able to use this in your index.php
$response["last_inserted_id"] = $_SESSION['inserted_id '];