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CHAPTER 9 DEALING WITH CUSTOMER ORDERS
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The order_detail Table Let s see what information the order_detail table contains. Take a look at Figure 9-3 to see some typical order_detail records.
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Figure 9-3. Sample data in the order_detail table Each record in order_detail represents an ordered product that belongs to the order specified by order_id. The primary key is formed by both order_id and product_id because a particular product can be ordered only once in one order. A quantity field contains the number of ordered items, so it wouldn t make any sense to have one product_id recorded more than once for one order. You might be wondering why the product_id and the price and product name are recorded in the order_detail table, especially because if you have the product id, you can get all of the product s details from the product table without having any duplicated information. We chose to duplicate the product data (the product s name and price) in the order_detail table to guard against product information changes; products can be removed from the database, and their name and price can change, but this shouldn t affect the orders data. We store the product_id because apart from being the only programmatic way to link back to the original product info (if the product still exists), product_id is used to create the primary key of order_detail. product_id comes in very handy here because having it in the composite primary key in order_detail saves you from needing to add another primary key field, and also ensures that you won t have the same product more than once in a single order.
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Implementing the Data Tier
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At this stage, you need to add two additional data tier functions in the hatshop database. The most important is shopping_cart_create_order, which takes the products from the shopping cart and creates an order with them. The other function is shopping_cart_empty, which empties the visitor s cart after the order has been placed.
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In the following exercise we ll implement those functions starting with shopping_cart_empty because this is called from shopping_cart_create_order.
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Exercise: Implementing the Functions
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1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the shopping_cart_empty function in your hatshop database: -- Create shopping_cart_empty function CREATE FUNCTION shopping_cart_empty(CHAR(32)) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; BEGIN DELETE FROM shopping_cart WHERE cart_id = inCartId; END; $$; When a customer places an order, shopping_cart_create_order will call shopping_cart_empty to delete the products from the customer s shopping cart. 4. Use the query tool to execute this code, which creates the shopping_cart_create_order function in your hatshop database: -- Create shopping_cart_create_order function CREATE FUNCTION shopping_cart_create_order(CHAR(32)) RETURNS INTEGER LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; outOrderId INTEGER; cartItem cart_product; orderTotalAmount NUMERIC(10, 2); BEGIN -- Insert a new record into orders INSERT INTO orders (created_on) VALUES (NOW()); -- Obtain the new Order ID SELECT INTO outOrderId currval('orders_order_id_seq'); orderTotalAmount := 0; -- Insert order details in order_detail table FOR cartItem IN SELECT p.product_id, p.name, COALESCE(NULLIF(p.discounted_price, 0), p.price) AS price, sc.quantity, COALESCE(NULLIF(p.discounted_price, 0), p.price) * sc.quantity AS subtotal
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CHAPTER 9 DEALING WITH CUSTOMER ORDERS
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FROM shopping_cart sc INNER JOIN product p ON sc.product_id = p.product_id WHERE sc.cart_id = inCartId AND sc.buy_now LOOP INSERT INTO order_detail (order_id, product_id, product_name, quantity, unit_cost) VALUES (outOrderId, cartItem.product_id, cartItem.name, cartItem.quantity, cartItem.price); orderTotalAmount := orderTotalAmount + cartItem.subtotal; END LOOP; -- Save the order's total amount UPDATE orders SET total_amount = orderTotalAmount WHERE order_id = outOrderId; -- Clear the shopping cart PERFORM shopping_cart_empty(inCartId); -- Return the Order ID RETURN outOrderId; END; $$; This function gets called when the customer decides to buy the products in the shopping cart and clicks the Place Order button. The role of shopping_cart_create_order is to create a new order based on the products in the customer s shopping cart. This implies adding a new record to the orders table and a number of records (one record for each product) in the order_detail table.
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