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On Unix-related platforms, it s possible to add a shebang line as the first line of a Ruby script so that it can be executed without having to invoke the Ruby interpreter explicitly. For example: #!/usr/bin/ruby puts "Hello, world!" You can take this script, give it a simple filename such as hello (no .rb extension needed), make the file executable (using chmod), and run it directly using its filename rather than having to invoke the Ruby interpreter explicitly. 10 covers this technique in more depth. More information about the shebang line specifically is available at http://en.wikipedia.org/ wiki/Shebang_(Unix).

One measure of programming complexity is the number of mental objects you have to keep in mind simultaneously in order to understand a program. This mental juggling act is one of the most difficult aspects of programming and is the reason programming requires more concentration than other activities. It s the reason programmers get upset about quick interruptions such interruptions are tantamount to asking a juggler to keep three balls in the air and hold your groceries at the same time. Intuitively, the complexity of a program would seem to largely determine the amount of effort required to understand it. Tom McCabe published an influential paper arguing that a program s complexity is defined by its control flow (1976). Other researchers have identified factors other than McCabe s cyclomatic complexity metric (such as the number of variables used in a routine), but they agree that control flow is at least one of the largest contributors to complexity, if not the largest.

All the Windows clients of an SBS network must be running Windows XP SP2 or later, but in most networks they will be running Windows Vista. If you have any workstations running earlier versions of Windows, they are no longer supported and should be upgraded. You can also have Mac and even UNIX or Linux clients, but their ability to integrate fully with the SBS network will be limited. Windows clients must be running a business-class version of Windows speci cally, Windows XP Professional, Windows XP Tablet PC Edition, Windows Vista Business, Windows Vista Enterprise, or Windows Vista Ultimate.

Using the new OUTPUT clause, you can direct the deleted rows from each batch into the OrdersArchive table. For example, the following code is the enhanced solution, which purges orders with an OrderDate before 2001 in batches and also archives them: WHILE 1=1 BEGIN BEGIN TRAN DELETE TOP(5000) FROM dbo.LargeOrders OUTPUT deleted.* INTO dbo.OrdersArchive WHERE OrderDate < '20010101'; IF @@rowcount < 5000 BEGIN COMMIT TRAN BREAK; END COMMIT TRAN END

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