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Take a moment to look around the room in which you re reading this book. At first, you may think that there really aren t that many things to observe: some furniture, light fixtures, perhaps some plants, artwork, even some other people or pets. Maybe there is a window to gaze out of that opens up the outside world to observation. Now look again. For each thing that you see, there are myriad details to observe: its size, its color, its intended purpose, the components from which it s assembled (the legs on a table, the lightbulbs in a lamp), etc. In addition, each one of these components in turn has details associated with it: the type of material used to make the legs of the table (wood or metal), the wattage of the lightbulbs, etc. Now factor in your other senses: the sound of someone snoring (hopefully not while reading this book!), the smell of popcorn coming from the microwave oven down the hall, and so forth. Finally, think about all of the unseen details of these objects: who manufactured them, or what their chemical, molecular, or genetic composition is. It s clear that the amount of information to be processed by our brains is truly overwhelming! For the vast majority of people, this doesn t pose a problem, however, because we re innately skilled at abstraction, a process that involves recognizing and focusing on the important characteristics of a situation or object, and filtering out or ignoring all of the unessential details.

In the old days, when the Oracle DBMS didn t yet support referential integrity constraints (which is a long time ago, before Oracle7), you were still able to implement certain integrity constraints by using WITH CHECK OPTION when creating views. For example, you could use subqueries in the view definition to check for row existence in other tables. Listing 10-18 gives an example of such a view. Nowadays, you don t need this technique anymore, of course. Listing 10-18. WITH CHECK OPTION and Constraint Checking SQL> 2 3 4 5 6 7 create select from where and or replace view reg_view as r.* registrations r r.attendee in (select empno from employees) r.course in (select code from courses)

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There are a number of general principles that can protect you from these attacks: Never allow session information to be contained in the URL. Django s session framework (see 12) simply doesn t allow sessions to be contained in the URL. Don t store data in cookies directly. Instead, store a session ID that maps to session data stored on the back-end. If you use Django s built-in session framework (i.e., request. session), this is handled automatically for you. The only cookie that the session framework uses is a single session ID; all the session data is stored in the database. Remember to escape session data if you display it in the template. See the earlier XSS section, and remember that the information there applies to any user-created content as well as any data sent from the browser. You should treat session information as being user created. Prevent attackers from spoofing session IDs whenever possible. Although it s nearly impossible to detect someone who s hijacked a session ID, Django does have built-in protection against a brute-force session attack. Session IDs are stored as hashes (instead of sequential numbers), which prevents a brute-force attack, and a user will always get a new session ID if she tries a nonexistent one, which prevents session fixation. Notice that none of those principles and tools prevents man-in-the-middle attacks. These types of attacks are nearly impossible to detect. If your site allows logged-in users to see any sort of sensitive data, you should always serve that site over HTTPS. Additionally, if you have an SSL-enabled site, you should set the SESSION_COOKIE_SECURE setting to True; this will make Django send session cookies only over HTTPS.

Finally, we ll define the second new (sub)class, Professor. This class would go into a separate Professor.java file: // Professor.java public class Professor extends Person { // Attributes specific only to a Professor; redundant attributes - i.e., those // that are shared with Student, and hence are now declared by Person - are // not included here. private String title; private Department worksFor; // Professor-specific accessor methods go here. public String getTitle() { return title; } public void setTitle(String t) { title = t; } // etc. for the other explicitly declared Professor attributes. // Other Professor-specific methods go here, if any; details omitted. } By generalizing the shared features of Students and Professors into a common superclass called Person, we ll easily be able to introduce a third type of Person, or a fourth, or a fifth, if needed in the future, and they ll all share in these same features through the mechanism of inheritance. Furthermore, if we wish to introduce new subtypes of these subclasses perhaps AdjunctProfessor and TenuredProfessor as subclasses of the Professor class they ll all derive a common set of features as a result of their shared Person ancestry.

and r.evaluation in (1,2,3,4,5) with check option;

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