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Here, you see the various pieces of the function, including language and is_deterministic, broken into separate fields. This view of the defined functions is cleaner if you are looking for a quick list of parameters or return types.

Tip You can also use the alpha component of the colors in your GradientStop items, which can result in gradients that fade between being transparent and opaque, in addition to or instead of fading colors.

MySQL provides an ALTER statement for stored functions, but as with stored procedures, the ALTER statement can change only the characteristics of a function, not the SQL statements that make up the body. The ALTER statement has the following syntax: ALTER FUNCTION [database.]<name> <characteristics>; Here is an example: mysql> ALTER FUNCTION shop.calc_total COMMENT 'encapsulate all functions for one big total'; You can change multiple characteristics within a single ALTER statement. If a characteristic isn t specified in the statement, the value is left as it was when the function was created. You can change all the characteristics listed in Table 10-1, shown earlier in the chapter, with one exception: the DETERMINISTIC characteristic isn t allowed in the ALTER statement. To remove a stored function, use the DROP command: DROP FUNCTION [database.]<name> Here is an example: mysql> DROP FUNCTION shop.calc_shipping; As expected, the DROP statement removes the function from the mysql.proc table.

JointsBehavior also calls checkTouching() in Grabbers. It examines each grabber to see if its fingers are touching the floor: public void checkTouching() { if (leftGrabber.touchingGround()) System.out.println("Left Grabber's fingers are touching the ground"); if (rightGrabber.touchingGround()) System.out.println("Right Grabber's fingers are touching the ground"); } // end of checkTouching()

Listing 11 21 shows another piece of XAML, this time containing four GradientStop items. The gradient fill begins in white and fades to black 25 percent of the way along. At 50 percent, it fades to white again, finally fading to gray at the end of the line. Listing 11 21. Multiple GradientStop items within a gradient fill <Rectangle> <Rectangle.Fill> <LinearGradientBrush EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="White" Offset="0" /> <GradientStop Color="Black" Offset="0.25" /> <GradientStop Color="White" Offset="0.5" /> <GradientStop Color="Gray" Offset="1" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> The end result of this fill is shown in Figure 11 17. The four gradient stop points are displayed on the left edge of the figure for illustrative purposes.

When speaking of permissions in regard to stored functions, two main sets are involved: permissions to create and manage stored functions, and permissions to use functions. To create a function in a database, the user must have the CREATE ROUTINE privilege. To change an existing function, the user must have the ALTER ROUTINE privilege. Permissions for creating or changing procedures can be granted globally (in the mysql.user table), at the database level (in the mysql.db table), or for a specific routine (in the mysql.procs_priv table). To use a function, the caller must have the EXECUTE privilege for the particular database. When the function is called, the actions in the function are performed either by the user who is executing the function or the user who defined the function, depending on if the SQL SECURITY is set to DEFINER or INVOKER. As with the CREATE and ALTER statements, permissions for executing a function can be granted globally (in the mysql.user table), at the database level (in the mysql.db table), or for a specific routine (in the mysql.procs_priv table). When a stored function is created, the creator is automatically granted the ALTER ROUTINE and EXECUTE privilege for that routine. 15 addresses account administration and permissions, and provides more details on granting users appropriate permissions for managing and using stored functions.

Figures 4-1 and 4-2 show the grabbers in action, and a grabber s joints are highlighted in Figure 4-3. A grabber has a vertical base, a forearm, and two fingers. Its forearm points along the negative z-axis and can turn left/right, up/down, and spin around its main axis. Its two fingers are vertically aligned and can open and close. There are three joints at the elbow between the base and the forearm for rotating the forearm around the x-, y-, and z- axes, and one joint for each finger. The Grabber class performs three tasks: It builds the grabber s scene graph, which includes TransformGroups for the joints, Java 3D Cylinders and a Box for its shape, and a shiny metallic material and texture for its appearance. It processes rotation commands, moving specified joints, but only within hardwired limits. For example, a finger can only rotate open to a maximum of 20 degrees. It supports bounds detection for its forearm and fingers. However, most of the hard work is done by the GrabberBounds object.