Calling stored procedures with an OUT parameter in PHP [duplicate] - php

Question

This question already has answers here:
PHP: Calling MySQL Stored Procedure with Both INPUT AND OUTPUT Parameters (NOT "INOUT")
(2 answers)
Closed 3 years ago.
To call a Stored procedure with an IN parameter is easy like
CREATE PROCEDURE `catalog_delete_product`(IN `inProductId` INT) BEGIN DELETE FROM product_attribute WHERE product_id = inProductId; DELETE FROM product_category WHERE product_id = inProductId; DELETE FROM shopping_cart WHERE product_id = inProductId; DELETE FROM product WHERE product_id = inProductId; END
You can see that it is as easy as that. But how do we call an OUT parameter in MySQL Stored parameter and use it in PHP?

Answer 1

As an example to illustrate it, I will a real world practical example(inserting data into an order table and returning the lastInsertId).
CREATE PROCEDURE `shopping_cart_create_order`(IN `inCartId` INT(11), OUT `newOrderId` INT(11)) BEGIN
DECLARE newOrder int;
-- Insert a new record into orders and obtain the new order ID
INSERT INTO orders (created_on) VALUES (NOW());
-- Obtain the new Order ID
SELECT LAST_INSERT_ID() INTO newOrder;
SET newOrder = newOrderId;
END
At PHP level// Probably at the Model/Entity level First, we need to execute the
shopping_cart_create_order()
stored procedure. Which might probably be in a function.
Second, to get the last order id, we need to query it from the variable
#oid
. It is important that we must call the method
closeCursor()
of the PDOStatement object in order to execute the next SQL statement.
function query($pdo, $sql, $parameters = []){
$query = $pdo->prepare($sql);
$query->execute($parameters);
return $query;
}
function create_order($pdo, $cart_id){
// Binding the parameters
$parameters = [':cart_id' => $cart_id];
// calling stored procedure command
$sql = 'CALL shopping_cart_create_order(:cart_id)';
// prepare for execution of the stored procedure, pass value to the command
and execute the Stored Procedure
$query = query($pdo, $sql, $parameters);
// Then close Cursor. It is important for you to close it.
$query->closeCursor();
// execute the second query to get last insert id
$row = $pdo->query("SELECT #oid AS oid")->fetch();
return $row;
}