<?php
/*********************************************
* step 2
* - get_products_by_category($category_id)
**********************************************/
function get_products_by_category($category_id) {
    global $db;
    $query = 'SELECT * FROM products
              WHERE products.categoryID = :category_id
              ORDER BY productID';
    $statement = $db->prepare($query);
    $statement->bindValue(":category_id", $category_id);
    $statement->execute();
    $products = $statement->fetchAll();
    $statement->closeCursor();
    return $products;
}

/***********************************************
* step 3
* delete_product($product_id)
***********************************************/
function delete_product($product_id) {
    global $db;
    $query = 'DELETE FROM products
              WHERE productID = :product_id';
    $statement = $db->prepare($query);
    $statement->bindValue(':product_id', $product_id);
    $statement->execute();
    $statement->closeCursor();
}

/***********************************************
* step 5
* add_product($category_id, $code, $name, $price)
***********************************************/
function add_product($category_id, $code, $name, $price) {
    global $db;
    $query = 'INSERT INTO products
                 (categoryID, productCode, productName, listPrice)
              VALUES
                 (:category_id, :code, :name, :price)';
    $statement = $db->prepare($query);
    $statement->bindValue(':category_id', $category_id);
    $statement->bindValue(':code', $code);
    $statement->bindValue(':name', $name);
    $statement->bindValue(':price', $price);
    $statement->execute();
    $statement->closeCursor();
}
?>