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Listing 13-6. Records in the customer_audit Table After Updating mysql> SELECT * FROM customer_audit; +----+--------+-------------+---------+---------------------+ | id | action | customer_id | name | changed | +----+--------+-------------+---------+---------------------+ | 1 | update | 1 | Mike | 2005-05-10 22:20:44 | | 2 | update | 2 | Jay | 2005-05-10 22:20:44 | | 3 | update | 3 | Johanna | 2005-05-10 22:20:44 | | 4 | update | 4 | Michael | 2005-05-10 22:20:44 | | 5 | update | 5 | Heidi | 2005-05-10 22:20:44 | | 6 | update | 6 | Ezra | 2005-05-10 22:20:44 | +----+--------+-------------+---------+---------------------+ 6 rows in set (0.00 sec) As you can see in Listing 13-6, the customer_audit table contains the previous value for name and the time it was changed. As part of our audit trail, we also want to keep track of any records that are removed from the customer table. The before_customer_delete trigger defined in Listing 13-7 does this for deletions to the customer table. Listing 13-7. Creating the before_customer_delete Trigger DELIMITER // CREATE TRIGGER before_customer_delete BEFORE DELETE ON customer FOR EACH ROW BEGIN INSERT INTO customer_audit SET action='delete', customer_id = OLD.customer_id, name = OLD.name, changed = NOW(); END // DELIMITER ; Listing 13-7 looks a lot like the before_customer_update trigger, but the trigger is modified to respond to DELETE statements against the customer table. Before any row is deleted from the customer table, a record is inserted into the customer_audit table with the values of that row. To test the trigger, we issue a command to delete all the records in the customer table: mysql> DELETE FROM customer; Query OK, 6 rows affected (0.01 sec)

Having a screen full of sprites is of little use for gaming if they cannot move, so this section will look at different methods for moving the sprites around the page. There are two approaches that we can use for this: procedural movement based on the application s rendering event or storyboard animation. Each of these has its advantages and disadvantages, so let s take a look and see how they work and what they do.

The scene graph in Figure 2-7 doesn t include the view branch graph; that branch is shown in Figure 2-8.

This statement removes all the records from the customer table and activates the customer table s trigger for record deletions. If we look at the customer_audit table, we ll see a row inserted for each of the deletions from the customer table, as shown in Listing 13-8. Listing 13-8. Records in the customer_audit Table After Deletions mysql> SELECT * FROM customer_audit; +----+--------+-------------+---------+---------------------+ | id | action | customer_id | name | changed | +----+--------+-------------+---------+---------------------+ | 1 | update | 1 | Mike | 2005-05-10 22:20:44 | | 2 | update | 2 | Jay | 2005-05-10 22:20:44 | | 3 | update | 3 | Johanna | 2005-05-10 22:20:44 | | 4 | update | 4 | Michael | 2005-05-10 22:20:44 | | 5 | update | 5 | Heidi | 2005-05-10 22:20:44 | | 6 | update | 6 | Ezra | 2005-05-10 22:20:44 | | 7 | delete | 1 | MIKE | 2005-05-10 23:00:20 | | 8 | delete | 2 | JAY | 2005-05-10 23:00:20 | | 9 | delete | 3 | JOHANNA | 2005-05-10 23:00:20 | | 10 | delete | 4 | MICHAEL | 2005-05-10 23:00:20 | | 11 | delete | 5 | HEIDI | 2005-05-10 23:00:20 | | 12 | delete | 6 | EZRA | 2005-05-10 23:00:20 | +----+--------+-------------+---------+---------------------+ 12 rows in set (0.00 sec) As you can see, the table has entries for both the UPDATE and the DELETE statements we ran, giving us a history of the changes to the customer table. Now that you ve seen some of the syntax and a working example, let s take a look at the details of each piece of the CREATE TRIGGER statement.

We can provide programmatic updates to the sprites within our game along very similar lines to the approach used in XNA While Silverlight doesn t have any concept of updating and drawing the objects that it wants to display, it does provide an event named Rendering that is fired every time the scene is ready to be redrawn We can hook into this event and use it to trigger the updates to the sprites in our game There is no need to explicitly draw them, of course, because Silverlight automatically draws all controls within its current page Listing 13 15 shows the code required within a page to add a handler to the Rendering event and respond to it when it fires Listing 13 15 Responding to the Rendering event public MainPage() { InitializeComponent(); // Add the Rendering event handler CompositionTarget.

CHAPTER 2 s GET A LIFE (IN 3D)

When you re building triggers, we recommend you use a versioning system like CVS or subversion for Tip the source of the trigger creation statements. Trigger development, like other pieces of your database and application, results in a piece of code that is valuable to your organization.