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There are two types of data: base data and derivable data Base data is data that cannot be derived in any way from other data residing in the information system It is crucial that base data is stored in the database Derivable data can be deduced (for example, with a formula) from other data For example, if we store both the age and the date of birth of each course attendee in our database, these two attributes are mutually derivable assuming that the current date is available at any moment Actually, every question issued against a database results in derived data In other words, it is both undesirable and impossible to store all derivable data in an information system Storage of derivable data is referred to as redundancy Another way of defining redundancy is storage of the same data more than once.

When SessionMiddleware is activated, each HttpRequest object the first argument to any Django view function will have a session attribute, which is a dictionary-like object You can read it and write to it in the same way you d use a normal dictionary For example, in a view you could do stuff like this: # Set a session value: requestsession["fav_color"] = "blue" # Get a session value -- this could be called in a different view, # or many requests later (or both): fav_color = requestsession["fav_color"] # Clear an item from the session: del requestsession["fav_color"] # Check if the session has a given key: if "fav_color" in requestsession: .. You can also use other mapping methods like keys() and items() on requestsession There are a couple of simple rules for using Django s sessions effectively: Use normal Python strings as dictionary keys on request.

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faculty.add(p1); faculty.add(p2); faculty.add(p3); // --------// Students. // --------s1 = new Student("Joe Blow", "111-11-1111", "Math", "M.S."); s2 = new Student("Fred Schnurd", "222-22-2222", "Information Technology", "Ph. D."); s3 = new Student("Mary Smith", "333-33-3333", "Physics", "B.S."); // Add these to the appropriate ArrayList. studentBody = new ArrayList<Student>(); studentBody.add(s1); studentBody.add(s2); studentBody.add(s3); // -------// Courses. // -------c1 = new Course("CMP101", "Beginning Computer Technology", 3.0); c2 = new Course("OBJ101", "Object Methods for Software Development", 3.0); c3 = new Course("CMP283", "Higher Level Languages (Java)", 3.0); c4 = new Course("CMP999", "Living Brain Computers", 3.0); c5 = new Course("ART101", "Beginning Basketweaving", 3.0); // Add these to the appropriate ArrayList. courseCatalog = new ArrayList<Course>(); courseCatalog.add(c1); courseCatalog.add(c2); courseCatalog.add(c3); courseCatalog.add(c4); courseCatalog.add(c5);

Sometimes, it makes sense to store redundant data in a database; for example, in cases where response time is crucial and in cases where repeated computation or derivation of the desired data would be too time-consuming But typically, storage of redundant data in a database should be avoided First of all, it is a waste of storage capacity However, that s not the biggest problem, since gigabytes of disk capacity can be bought for relatively low prices these days The challenge with redundant data storage lies in its ongoing maintenance With redundant data in your database, it is difficult to process data manipulation correctly under all circumstances In case something goes wrong, you could end up with an information system containing internal contradictions In other words, you would have inconsistent data Therefore, redundancy in an information system results in ongoing consistency problems.

We use the addPrerequisite method of the Course class to interrelate some of the Courses, so that c1 is a prerequisite for c2, c2 for c3, and c3 for c4. The only Courses that do not specify prerequisites in our test case are c1 and c5. // Establish some prerequisites (c1 => c2 => c3 => c4). c2.addPrerequisite(c1); c3.addPrerequisite(c2); c4.addPrerequisite(c3); To create Section objects, we take advantage of the Course class s scheduleSection method which, as you may recall, contains an embedded call to a Section class constructor. Each invocation of scheduleSection returns a handle to a newly created Section object, which we store in the appropriate collection. // --------// Sections. // --------// Schedule sections of each Course by calling the // scheduleSection method of Course (which internally // invokes the Section constructor). sec1 = c1.scheduleSection('M', "8:10 - 10:00 PM", "GOVT101", 30); sec2 = c1.scheduleSection('W', "6:10 - 8:00 PM", "GOVT202", 30); sec3 = c2.scheduleSection('R', "4:10 - 6:00 PM", "GOVT105", 25); sec4 = c2.scheduleSection('T', "6:10 - 8:00 PM", "SCI330", 25); sec5 = c3.scheduleSection('M', "6:10 - 8:00 PM", "GOVT101", 20); sec6 = c4.scheduleSection('R', "4:10 - 6:00 PM", "SCI241", 15); sec7 = c5.scheduleSection('M', "4:10 - 6:00 PM", "ARTS25", 40); // Add these to the Schedule of Classes. scheduleOfClasses.addSection(sec1); scheduleOfClasses.addSection(sec2); scheduleOfClasses.addSection(sec3); scheduleOfClasses.addSection(sec4); scheduleOfClasses.addSection(sec5); scheduleOfClasses.addSection(sec6); scheduleOfClasses.addSection(sec7); Next, we use the agreeToTeach method declared for the Professor class to assign Professors to Sections:

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