Executing Multiple Queries Using PDO

Question

I am trying to execute the following query using a PDO Prepared Statement, but when I call $query->fetch(); it throws an exception SQLSTATE[HY000]: General

Answer 1

You would be correct in that PDO (and I believe any PHP method?) does not allow for multiple queries in a single by default. There are some workarounds which you can read about more, such as:

PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)

but they do increase the risk of SQL injection so it is ill-advised.

Answer 2

Run your first query which is the insert then after success on that one get the last insertid then use the id on your next query.. Eg.

<?php



try {

        $db = new Database(); //Create a new object of type Database establishing a connection to the MySQL database


        $query = $db->prepare("INSERT INTO orders (order_type`, `item`, `amount`, `price`, `price_btc`, `status`, `timestamp`, `placed_by`, `secret`, `first_name`, `last_name`, `address_1`, `address_2`, `city`, `zip_code`, `country`, `state`, `phone_number`) VALUES(:order_type, :item, :amount, :price, :price_btc, :status, :timestamp, :placed_by, :secret, :first_name, :last_name, :address_1, :address_2, :city, :zip_code, :country, :state, :phone_number)");

        $query->execute(array( /* your values*/ ));


        $lastId = $db->lastInsertId(); // fetch last insert id, after success.


        $order = $db->prepare("SELECT * FROM `orders` WHERE `ID`=?");
        $order->bindValue(1, $lastId);
        $order->execute();
        //Fetch your records and display.


}
catch (PDOException $e) {
        echo "Error : " . $e->getMessage();

}

?>

I left some part of the codes like you did, but the important thing is to run the insert first then collect the last

Answer 3

You don't need a multiple statement.

So just run your queries one by one

$db = new Database(); //Create a new object of type Database establishing a connection to the MySQL database
$query = $db->pdo->prepare("INSERT INTO `orders` (`order_type`, `item`, `amount`, `price`, `price_btc`, `status`, `timestamp`, `placed_by`, `secret`, `first_name`, `last_name`, `address_1`, `address_2`, `city`, `zip_code`, `country`, `state`, `phone_number`)
                         VALUES(:order_type, :item, :amount, :price, :price_btc, :status, :timestamp, :placed_by, :secret, :first_name, :last_name, :address_1, :address_2, :city, :zip_code, :country, :state, :phone_number)"
); //Prepare the first query

/*HERE IS SOME CODE TO BIND PLACEHOLDERS TO SOME VALUES*/

$query->execute();

$order = $db->pdo->query("SELECT * FROM `orders` WHERE `ID`=LAST_INSERT_ID()")->fetch(PDO::FETCH_ASSOC);