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The SUM function does not make any distinction between {1,2,3,NULL} and {1,2,3,0}. The MIN and AVG functions don t make any distinction between {1,2,3,NULL} and {1,2,3,2}. The MAX function gives the same result on all three sets. Looking back at Listing 8-19, you see an example of function nesting: the AVG function operates on the result of the COALESCE function. This is a typical method to handle null values explicitly. As you can see from Listing 8-19, the results of AVG(COMM) and AVG(COALESCE(COMM,0)) are obviously different. In this case, the Oracle DBMS replaces all null values by zeros before applying the AVG function, because the null values in the COMM column actually mean not applicable. The next query, shown in Listing 8-20, tells us how many different courses are scheduled for each trainer and the total number of scheduled courses. Listing 8-20. GROUP BY and DISTINCT select trainer , count(distinct course) , count(*)

// Initialize the CourseCatalog collection. // Note that we're using a custom Exception type (as we did // for Faculty) to signal various initialization errors. public static CourseCatalog initializeCourseCatalog() throws SRSInitializationException { Details explained later in the chapter ... } // Initialize ScheduleOfClasses. Note that we're using a custom Exception // type (as we did for Faculty) to signal various initialization errors. public static ScheduleOfClasses initializeScheduleOfClasses(String semester) throws SRSInitializationException { Details explained later in the chapter ... } // // // // Initialize a single Student. Again, we are using a custom Exception -- in this case, InvalidStudentException, which is a subtype of SRSInitializationException -- to signal various issues with retrieving the Student's state from persistent storage.

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The message system is a lightweight way to queue messages for given users. A message is associated with a User. There s no concept of expiration or timestamps. Messages are used by the Django admin interface after successful actions. For example, when you create an object, you ll notice a The object was created successfully message at the top of the admin page. You can use the same API to queue and display messages in your own application. The API is simple: To create a new message, use user.message_set.create(message='message_text'). To retrieve/delete messages, use user.get_and_delete_messages(), which returns a list of Message objects in the user s queue (if any) and deletes the messages from the queue. In this example view, the system saves a message for the user after creating a playlist: def create_playlist(request, songs): # Create the playlist with the given songs. # ... request.user.message_set.create( message="Your playlist was added successfully." ) return render_to_response("playlists/create.html", context_instance=RequestContext(request)) When you use RequestContext, the currently logged-in user and his or her messages are made available in the template context as the template variable {{ messages }}. Here s an example of template code that displays messages: {% if messages %} <ul> {% for message in messages %} <li>{{ message }}</li> {% endfor %} </ul> {% endif %} Note that RequestContext calls get_and_delete_messages behind the scenes, so any messages will be deleted even if you don t display them. Finally, note that this messages framework only works with users in the user database. To send messages to anonymous users, use the session framework directly.

offerings by trainer;

public static Student initializeStudent(String sId) throws InvalidStudentException { Details explained later in the chapter ... } // Persist the state of a Student. This method writes out all of the // student's information to his/her ssn.dat file when he/she logs off. // Once again, we use a custom Exception type -- StudentPersistenceException -// to signal problems. public static void persistStudent(Student s) throws StudentPersistenceException { Details explained later in the chapter ... } } We ll next look at the initializeScheduleOfClasses method of the SRSDataAccess class in detail.

The static SRSDataAccess.initializeScheduleOfClasses method will be invoked from the main method of our SRS application to initialize the contents of an instance of a ScheduleOfClasses collection, declared as follows in the main method of the SRS class (which we ll review in its entirety a bit later in this chapter):

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