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Figure 1-8. It does not show on the surface, but MyClass is playing an important role in this application. The important thing to remember is that MyClass knows nothing about QLineEdit or QLabel, and vice versa they meet in the main function where they are interconnected. There is no need for having events, delegates, or signal classes that are commonly known by the involved classes. The only common factor is that they inherit QObject; the rest of the needed information is available at run-time from the meta-objects.

the Internet and stored in a physically secure location where no one is allowed to access it, the computer will be very secure The problem is that such a computer is not readily available to anyone for use You want to design systems whose functionality is available to the largest possible intended audience while being as secure as possible A service like PayPal (wwwpaypalcom), which supports person-to-person payments, is an example of a system that generates more revenue the more users take advantage of it, and as such, its availability is critical users may get very upset if they cannot access their funds at a moment s notice How does one achieve availability in a system One method is to add redundancy to eliminate any single point of failure For example, consider a telephone network.

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The SQL builder assembles chunks of SQL, and printing them displays the SQL. Notice that it has correctly added the || operator, which causes the strings to be concatenated in most RDBMSs. MySQL is slightly different, though. It requires strings to be concatenated with the concat() function. SQLAlchemy even does the right thing with MySQL. On MySQL you get this: >>> print page_table.c.name + user_table.c.title concat(page.name, user.title) Once you have generated a select object, you can still add extra clauses to it. For example, if you wanted to add an ORDER_BY clause, you could write this: s = select([page_table], and_(page_table.c.id<=10, page_table.c.name.like(u't%'))) s = s.order_by(page_table.c.title.desc(), page_table.c.id) This would run the same query as before but order by title descending and then by id. You can write update statements like this: print "\nUpdating Results\n" from sqlalchemy import update u = update(page_table, page_table.c.title==u'New Title') connection.execute(u, title=u"Updated Title") If you add the previous to the sqlexpressions_test.py file before connection.close() and execute it again, the corresponding UPDATE statement looks like this: Updating Results 2008-09-04 17:00:58,673 INFO sqlalchemy.engine.base.Engine.0x..d0 UPDATE page SET title= WHERE page.title = 2008-09-04 17:00:58,673 INFO sqlalchemy.engine.base.Engine.0x..d0 [u'Updated Title', u'New Title'] 2008-09-04 17:00:58,674 INFO sqlalchemy.engine.base.Engine.0x..d0 COMMIT Notice that SQLAlchemy automatically sent a COMMIT message to save the changes. Finally, let s look at deleting rows. The pattern should be getting very familiar now. You can write delete statements like this: print "\nDeleting Row\n" from sqlalchemy import delete d = delete(page_table, page_table.c.id==1) connection.execute(d) If you add the previous to the sqlexpressions_test.py file before connection.close() and execute it again, the corresponding DELETE statement looks like this:

Qt has classes to replace the classes of the C++ STL (until now, you have seen the QString class). This section looks at the containers and iterators that Qt has to offer. Qt s containers are template classes and can contain any other mutable class. There is a range of different containers, including different lists, stacks, queues, maps, and hash lists. With these classes come iterators both STL-compatible ones and Qt s Java-inspired versions. Iterators are lightweight objects that are used to move around in the containers and to get access to the data kept in them.

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