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SQL s UPDATE statement However, the kind of multiple assignment we believe we need, and the kind we ll be discussing in the rest of this chapter, is different from all of these! Dijkstra s notion of concurrent assignment is, perhaps, closest to what we have in mind Unlike Dijkstra, however, we do not require that the target variables all be distinct; in some cases, in fact, we explicitly want to be able to specify the same target variable more than once, for reasons that should become clear as we proceed..

The ability to query key states is helpful for the game s organization When you extend the Canvas class directly, you must implement keyPressed(int keyCode) if your game is interested in keystrokes The application management software then calls this method when the user presses a button But if your program is running on its own thread, this might happen at any point in your game s algorithm If you re not careful about using synchronized blocks, this could potentially cause errors if one thread is updating data about the game s current state and the other is using that data to perform calculations The program is simpler and easier to follow if you get the keystroke information when you want it by calling the GameCanvas method getKeyStates() An additional advantage of the getKeyStates() method is that it can tell you if multiple keys are being pressed simultaneously.

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6. In this chapter we use the terms table, row, and column in SQL contexts (mainly in Appendix A), the more formal terms relation, tuple, and attribute elsewhere.

CHAPTER 8 JOHNNXT IS ALIVE!

At this point, it would be nice if we could say exactly what our multiple assignment operator is. As you might expect, however, the fact that we want to be able to specify the same target variable more than once causes complications, and we aren t yet in a position to explain just what those complications are. Until further notice, therefore, we focus not so much on what the operator actually is, but rather on why we need it and why systems should support it and we hope our examples will be sufficient, for now, to give some idea as to how it s supposed to work. As a basis for our first example, consider the usual suppliers-and-parts database, with definition as follows (Tutorial D syntax): VAR S RELATION /* suppliers */ { S# S#, SNAME CHAR, STATUS INTEGER, CITY CHAR } KEY { S# } ; VAR P RELATION { P# P#, PNAME CHAR, COLOR COLOR, WEIGHT WEIGHT, CITY CHAR } KEY { P# } ; /* parts */

VAR SP RELATION /* shipments */ { S# S#, P# P#, QTY QTY } KEY { S#, P# } FOREIGN KEY { S# } REFERENCES S FOREIGN KEY { P# } REFERENCES P ; S, P, and SP here are relation variables or relvars (see The Third Manifesto for further explanation). Sample values for those relvars are shown in Figure 11-1.

The keyCode that s passed to the keyPressed(int keyCode) method can tell you only about a single key and therefore will be called multiple times even if the user presses two keys at the same time In a game, the precise timing of each keystroke is often important, so the Canvas method keyPressed() loses valuable information Looking at the method checkKeys() in Listing 3-3, you can see that the value returned by getKeyStates() contains all the keystroke information All you need to do is perform a bitwise and (&) between the getKeyStates() return value and a static field such as GameCanvasLEFT_PRESSED to tell if a given key is currently being pressed.

Add the symmetric panel #5 and another couple panels #5 and #6 to shape the round shoulders of JohnNXT.

(the one that attempts to move supplier S1 to Paris) is shorthand for the following: S := WITH ( ( ( ( ( S WHERE S# = S# ('S1') ) AS T1 , EXTEND T1 ADD ( 'Paris' AS NEWCITY ) ) AS T2 , T2 { ALL BUT CITY } ) AS T3 , T3 RENAME ( NEWCITY AS CITY ) ) AS T4 : S MINUS T1 ) UNION T4 ;

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