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In SQL, you can also join a table to itself. Although this join type is essentially the same as a regular join, it has its own name: autojoin or self-join. In other words, autojoins contain tables being referenced more than once in the FROM clause. This provides another good reason why you should use explicit tuple variables (as opposed to relying on table names as implicit tuple variables) in your SQL statements. In autojoins, the table names result in ambiguity issues. So why not use tuple variables consistently in all your SQL statements Listing 8-7 shows an example of an autojoin. The query produces an overview of all employees born after January 1, 1965, with a second column showing the name of their managers. (You may want to refer to Figure C-3 in Appendix C, which shows a diagram of the hierarchy of the EMPLOYEES table.)

We may store an entire object in binary form in a single field within a record, in the form of a binary (large) object (BLOB), as depicted conceptually in Figure 15-3.

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Like the session tools, authentication support is bundled as a Django application in django. contrib, which needs to be installed. Like the session system, it s also installed by default, but if you ve removed it, you ll need to follow these steps to install it: 1. Make sure the session framework is installed as described earlier in this chapter. Keeping track of users obviously requires cookies, and thus builds on the session framework. 2. Put 'django.contrib.auth' in your INSTALLED_APPS setting and run manage.py syncdb. 3. Make sure that 'django.contrib.auth.middleware.AuthenticationMiddleware' is in your MIDDLEWARE_CLASSES setting after SessionMiddleware. With that installation out of the way, we re ready to deal with users in view functions. The main interface you ll use to access users within a view is request.user; this is an object that represents the currently logged-in user. If the user isn t logged in, this will instead be an AnonymousUser object (see the following section for more details). You can easily tell if a user is logged in with the is_authenticated() method: if request.user.is_authenticated(): # Do something for authenticated users. else: # Do something for anonymous users.

Listing 8-7. Autojoin (Self-Join) Example select , from , where and e.ename as employee m.ename as manager employees m employees e e.mgr = m.empno e.bdate > date '1965-01-01'; MANAGER -------BLAKE BLAKE SCOTT KING KING FORD

We can output an object in a special binary form known as a Java serialized object, which is ideal for distributing objects over a network. We can save information in a fairly straightforward, human-readable text format, as either of the following:

It turns out that there is another way to create an array in Java that looks more objectlike, but the code isn t pretty :

Because we have two tuple variables e and m, both ranging freely over the same table, we get 14 14 = 196 possible row combinations. The WHERE clause filters out the correct combinations, where row m reflects the manager of row e.

Cross-site scripting (XSS) is found in Web applications that fail to escape user-submitted content properly before rendering it into HTML. This allows an attacker to insert arbitrary HTML into your Web page, usually in the form of <script> tags.

// Declare an array "x" of 20 Student references. Object x = Array.newInstance(Class.forName("Student"), 20);

To fully appreciate what this code is doing is beyond the scope of what you ve learned about objects thus far; suffice it to say that virtually all Java programmers use the shorthand form instead:

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