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Larry Ullman's Book Forums


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  1. I have this stored procedure that has 2 parameters, the first one is the cartId(which is the IN) and I have the newOrderId(which is the OUT). Now, I know that the inCartId is the cart id which will come from the form or whatever means the cart is been access but I don't understand the OUT newOrderId since that is what MySQL will return. Now, in the PHP calling this Stored procedure, it will look like this. $sql = 'CALL create_order(:cart_id, "What will be here")// The cart_id is what PHP will pass to MySQL, but what will be passed to the 2nd argument since does not before hand what MySQL will return. CREATE PROCEDURE create_order( IN inCartId int, OUT newOrderId int ) BEGIN -- 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 newOrderId; -- Insert order details in order_detail table INSERT INTO order_detail ( order_id, product_id, attributes, product_name, quantity, unit_cost ) SELECT orderId, p.id, sc.attributes, p.name, sc.quantity, COALESCE( NULLIF( p.discounted_price, 0 ), p.price ) AS unit_cost FROM shopping_cart sc INNER JOIN products p ON sc.product_id = p.id WHERE sc.cart_id = inCartId AND sc.buy_now; -- Save the order's total amount UPDATE orders SET total_amount = ( SELECT SUM( unit_cost * quantity ) FROM order_detail WHERE order_id = orderId ) WHERE id = orderId; -- Clear the shopping cart CALL shopping_cart_empty(inCartId); END
  2. oh sorry Larry for disturbing you as I have grasped the ideas of referencing events after posting. Albeit, I want to know if you have any book written on Phyton?
  3. in chapter 8, larry talks about events and referencing them. I need more examples on how to reference the event
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