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ne of the great strengths of relational database theory is that the tables (or more formally, the relations) are made up of distinct rows and so can be considered a set. You can then use all the power of mathematical set theory to help you with combining and extracting specific information. Don t be alarmed by the words mathematical and theory, as the ideas presented are both simple and elegant. The algebra notation introduced in s 1 and 2 is a useful way of expressing queries, especially as they become more complex. I will use the algebra notation in this chapter, but will always give you an SQL equivalent so you can choose which representation you find the most helpful. In this chapter, we will look at four set operations: Union Intersection Difference Division Many implementations of SQL (but not all) have keywords that support the first three of these operations directly. We will look at how to use these keywords, as well as alternative ways to achieve the same result when the keywords are not available.

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def turn_left(self): self.direction -= 1 self.direction = self.direction % 4 def move(self, distance): if self.direction == self.NORTH: self.y += distance elif self.direction == self.SOUTH: self.y -= distance elif self.direction == self.EAST: self.x += distance else: self.x -= distance def position(self): return (self.x, self.y) We ll go over that class definition in detail but right now, let s just see how to create a car, move it around, and ask the car where it is. Listing 6-2. from car import Car def test_car(): c = Car() c.turn_right() c.move(5) assert (5, 0) ==

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You ve learned a little about two of the most common server-side languages, so now it s time to move on to an example. I ll work through a simple application that shows the basic XML processing techniques in each language. You ll learn how to read XML content from an external document; transform it with XSLT; and add, edit, and delete content. For the remainder of the chapter, I ll work on a simple web application that organizes a DVD collection. The application stores the details of your DVD library in the XML document in fact, the one used throughout the book. It uses server-side XSLT to generate XHTML to display the contents of the library. The application allows you to add a new DVD, edit an existing DVD, and delete a DVD. Let s get started by looking at the XML document that contains the DVD list.

c.position()

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We will look at each of the set operations in turn, but so that you know where we are heading, I ll begin with a very quick overview of the three most common operations: union ( ), intersection ( ), and difference ( ). Imagine we have membership tables from two golf clubs. We might want to do the following: Determine who is in both clubs. Form a large list that combines all the members. Find out who is in one club but not the other. The basic set operations allow us to carry out all these tasks. Let s assume that the two clubs keep the names of their members in two tables that have exactly the same columns (more about this in the next section). Let s say the two tables are those shown in Figure 7-1. (OK, they are very small clubs!)

c.turn_left() c.move(3) assert (5, 3) == c.position() In Jython there are things that are callables. Functions are one kind of callable; classes are another. So one way to think of a class is that it s just a special kind of function, one that creates object instances. Once we ve created the car instance, we can simply call functions that are attached to the Car class and the object will manage its own location. From the point of view of our test code, we do not need to manage the location of the car nor do we need to manage the direction that the car is pointing in. We just tell it to move, and it does the right thing. Let s go over the syntax in detail to see exactly what s going on here. In Line 1 of car.py, we declare that our Car object is a subclass of the root object class. Jython, like many object-oriented languages, has a root object that all other objects are based off of. This object class defines basic behavior that all classes can reuse. Jython actually has two kinds of classes: new style and old style. The old way of declaring classes didn t require you to type object; you ll occasionally see the old-style class usage in some Jython code, but it s not considered good practice. Just subclass object for any of your base classes and your life will be simpler. Lines 3 to 6 declare class attributes for the direction that any car can point to. These are class attributes, so they can be shared across all object instances of the Car object. Class attributes can be referenced without having to create an object instance.

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