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All DML changes (INSERT, UPDATE, DELETE, and MERGE) that you apply to the contents of the database initially get a pending status. This means (among other things) that your session can see the changed rows, but other database users will see the original data when they query the same table rows. Moreover, as long as your changes are in this pending state, other database users will not be able to change those rows, until you confirm or abandon your pending changes. The SQL command to confirm pending changes to the database is COMMIT, and the command to abandon them is ROLLBACK. This allows you to perform a number of changes, then confirm them with a COMMIT or abandon them with ROLLBACK, then perform another number of changes, and so on. COMMITand ROLLBACK end the current transaction and start a new one. A transaction is considered to be a logical unit of work. In other words, a transaction is a set of changes that will succeed or fail as a whole.

public class SwingExample3 { 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"); } } If we were to execute these three programs using the verbose command-line option java verbose Swing1 java verbose Swing2 java verbose Swing3 (output not shown), we d discover that all three invocations cause the exact same classes to be loaded that is, the JFrame and JDialog bytecode would be loaded, whereas other extraneous javax.swing classes would not be loaded. Thus, the determination by the JVM at run time as to which classes should be loaded is based strictly on the logic of the main method that we are executing (which happens to be identical in all three example programs), without regard to the manner in which the import directives were crafted.

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Another common need is to filter down the objects given in a list page by some key in the URL. Earlier we hard-coded the publisher s name in the URLconf, but what if we wanted to write a view that displayed all the books by some arbitrary publisher We can wrap the object_list generic view to avoid writing a lot of code by hand. As usual, we ll start by writing a URLconf: urlpatterns = patterns('', (r'publishers/$', list_detail.object_list, publisher_info), (r'books/(w+)/$', books_by_publisher), ) Next, we ll write the books_by_publisher view itself: from django.http import Http404 from django.views.generic import list_detail from mysite.books.models import Book, Publisher def books_by_publisher(request, name): # Look up the publisher (and raise a 404 if it can't be found). try: publisher = Publisher.objects.get(name__iexact=name) except Publisher.DoesNotExist: raise Http404 # Use the object_list view for the heavy lifting. return list_detail.object_list( request, queryset = Book.objects.filter(publisher=publisher), template_name = "books/books_by_publisher.html", template_object_name = "books", extra_context = {"publisher" : publisher} ) This works because there s really nothing special about generic views they re just Python functions. Like any view function, generic views expect a certain set of arguments and return HttpResponse objects. Thus, it s incredibly easy to wrap a small function around a generic view that does additional work before (or after; see the next section) handing things off to the generic view. Notice that in the preceding example we passed the current publisher being displayed in the extra_context. This is usually a good idea in wrappers of this nature; it lets the template know which parent object is currently being browsed.

You learned in 5 that constructors are used to initialize an object s state when it is first instantiated: public class Student { private String name; private String major; // etc. // Constructor. public Student(String n) { setName(n); setMajor("TBD"); // default value // etc. } // etc. } The initialization code contained within a constructor is executed each time a new object of a given type is instantiated; thus, we wouldn t want to include code to initialize a static variable in such a constructor: public class Student { private String name; private String major; private int studentIDNo; private static int nextAvailableStudentIDNo; // etc.

Note The Oracle DBMS also allows you to define autonomous transactions using PL/SQL. These are subtransactions that you can COMMIT or ROLLBACK independently from their main transactions. See PL/SQL User s Guide and Reference for details.

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