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How It Works: Implementing Functions
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The first step in shopping_cart_create_order involves creating the new record in the orders table. You need to do this at the beginning to find out what order_id was generated for the new order. Remember that the order_id field is an INTEGER column that has a sequence associated (orders_order_id_seq) and is automatically generated by the database, so you need to retrieve its value after inserting a record into orders: -- Insert a new record into orders INSERT INTO orders (created_on) VALUES (NOW()); -- Obtain the new Order ID SELECT INTO outOrderId currval('orders_order_id_seq'); This is the basic mechanism of extracting the newly generated ID. After the INSERT statement, you save the value returned by currval to a variable. You must do this immediately after inserting the new row because the value returned by currval is incremented after the next successful insert operation. currval returns the current value of the sequence that is equivalent with the last inserted order_id.
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CHAPTER 9 DEALING WITH CUSTOMER ORDERS
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Using the outOrderId variable, you add the order_detail records by gathering information from the product and shopping_cart tables. You get the list of the products and their quantities from shopping_cart, get their names and prices from product, and save these records one by one to the order_detail table. -- Insert order details in order_detail table FOR cartItem IN SELECT p.product_id, p.name, COALESCE(NULLIF(p.discounted_price, 0), p.price) AS price, sc.quantity, COALESCE(NULLIF(p.discounted_price, 0), p.price) * sc.quantity AS subtotal FROM shopping_cart sc INNER JOIN product p ON sc.product_id = p.product_id WHERE sc.cart_id = inCartId AND sc.buy_now LOOP INSERT INTO order_detail (order_id, product_id, product_name, quantity, unit_cost) VALUES (outOrderId, cartItem.product_id, cartItem.name, cartItem.quantity, cartItem.price); orderTotalAmount := orderTotalAmount + cartItem.subtotal; END LOOP;
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When joining product and shopping_cart, you get the product_id from product, but you Tip
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could also get it from shopping_cart; the result would be the same because the table join is made on the product_id column.
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While saving the products, the function also calculates the total amount of the order by adding each product s price multiplied by its quantity to orderTotalAmount. This value is then saved as the order s total_amount: -- Save the order's total amount UPDATE orders SET total_amount = orderTotalAmount WHERE order_id = outOrderId; In the end, the function empties the visitor s shopping cart calling the shopping_cart_empty function and returns the order s ID: -- Clear the shopping cart PERFORM shopping_cart_empty(inCartId); -- Return the Order ID RETURN outOrderId;
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CHAPTER 9 DEALING WITH CUSTOMER ORDERS
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Implementing the Business Tier
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In this step, you only need a single method, CreateOrder, which you ll add to the ShoppingCart class inside business/shopping_cart.php: // Create a new order public static function CreateOrder() { // Build SQL query $sql = 'SELECT shopping_cart_create_order(:cart_id);'; // Build the parameters array $params = array (':cart_id' => self::GetCartId()); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetOne($result, $params); } The method calls the shopping_cart_create_order data tier function, returning the order_id of the newly created order.
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Implementing the Presentation Tier
You ve finally arrived at the part of the process where you ll put the code you ve written into action. The UI consists of the Place Order button along with all the logic behind it, which allows the visitor to become a customer. This button is the only addition on the visitor side for the custom checkout. Let s first place the button on the cart_details template file, and then implement its functionality. To get the desired functionality, you just follow a few simple steps. The first one involves adding the Place Order button to the shopping cart.
Adding the Place Order Button
Modify presentation/templates/cart_details.tpl by adding a new button just after the Update button, as highlighted in the following code snippet: <table> <tr> <td class="cart_total"> <span>Total amount:</span>  <span class="price">${$cart_details->mTotalAmount}</span> </td> <td class="cart_total" align="right"> <input type="submit" name="update" value="Update" /> <input type="submit" name="place_order" value="Place Order" /> </td> </tr> </table> Cool, now you have a Place Order button in the shopping cart!
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