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Now let s take a closer look at this queryset key we ve been using all along. Most generic views take one of these queryset arguments it s how the view knows which set of objects to display (see Selecting Objects in 5 for an introduction to QuerySets, and see Appendix C for the complete details). To pick a basic example, we might want to order a list of books by publication date, with the most recent first: book_info = { "queryset" : Book.objects.all().order_by("-publication_date"), } That s a pretty simple example, but it illustrates the idea nicely. Of course, you ll usually want to do more than just reorder objects. If you want to present a list of books by a particular publisher, you can use the same technique: apress_books = { "queryset": Book.objects.filter(publisher__name="Apress Publishing"), "template_name" : "books/apress_list.html" } urlpatterns = patterns('', (r'^publishers/$', list_detail.object_list, publisher_info), (r'^books/apress/$', list_detail.object_list, apress_books), ) Notice that along with a filtered queryset, we re also using a custom template name. If we didn t, the generic view would use the same template as the vanilla object list, which might not be what we want. Also notice that this isn t a very elegant way of doing publisher-specific books. If we want to add another publisher page, we need another handful of lines in the URLconf, and more than a few publishers would get unreasonable. We ll deal with this problem in the next section.

Ever since 2, we ve been typing the official main method header as follows: public static void main(String[] args) { ... We are now in a position to understand why the main method of an application must be declared to be static. When the JVM first starts running, no objects yet exist; objects are created only after the main method begins to execute, as it is the main method that creates the first objects for an application. So, in order to invoke the main method, the JVM must be permitted to invoke it on a class in particular, on the class to which the main method belongs, and whose bytecode we ve explicitly asked the JVM to load. Think back to our discussion of static methods in 7: a static method is one that can be invoked on a class as a whole, without first instantiating an object of that class. Hence, the main method must be static.

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When I first introduced the notion of import directives in 6, I mentioned in passing that whether we use a wildcard character (*) to import all of the classes in a given package // Import all classes in the javax.swing package using a wildcard. import javax.swing.*; or we import individual classes one by one // Import the JFrame and JDialog classes only. import javax.swing.JFrame; import javax.swing.JDialog; neither approach is more or less efficient than the other at run time. Let s use the verbose command-line flag to substantiate this claim. We ll write three different programs called SwingExample1, SwingExample2, and SwingExample3. In these programs, we re importing several classes from the javax.swing package which, as you ll learn in 16, is involved with building GUIs. (I ve chosen to craft this example around

The first row is not touched, because the DELTA_TAB contains no row for product 1. The second row is updated: the SALES value is incremented with 24, and the STATUS is set to CURR. The third (original) row is deleted, because after applying the UPDATE clause, the DELETE condition became TRUE. The fourth row is inserted, because there was no row for product 4.

Note If you get a 404 when requesting /books/apress/, check to ensure that you actually have a publisher with the name Apress Publishing. If you don t have that publisher, you ll get a 404. Generic views have an allow_empty parameter that changes this behavior; see Appendix D for details.

these javax.swing classes in particular because they are not among the core classes that automatically get loaded by the JVM upon startup. Thus, they ll be loaded only if necessary based on how we ve written our SwingExamplex programs.) All three SwingExamplex programs have the exact same main method body, and differ only in their import directives (bolded in the following code): // SwingExample1.java // Import all classes in the javax.swing package using the wildcard syntax. import javax.swing.*; public class SwingExample1 { public static void main(String[] args) { // This is the same exact main method logic as found in the // other two SwingExample programs. JFrame f = new JFrame("sample frame"); JDialog d = new JDialog(f, "sample dialog"); } } //------------------------------------------------------------// SwingExample2.java // Explicitly import the JFrame and JDialog classes only. import javax.swing.JFrame; import javax.swing.JDialog; public class SwingExample2 { public static void main(String[] args) { // This is the same exact main method logic as found in the // other two SwingExample programs. JFrame f = new JFrame("sample frame"); JDialog d = new JDialog(f, "sample dialog"); } } //------------------------------------------------------------// SwingExample3.java // Import two classes that we need -- JFrame and JDialog -- plus // two that we DON'T need/reference in our program. import javax.swing.JFrame; import javax.swing.JDialog; import javax.swing.JOptionPane; import javax.swing.JMenu;

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