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Deleting Row 2008-09-04 17:04:34,460 INFO sqlalchemy.engine.base.Engine.0x..f0 DELETE FROM page WHERE page.id = 2008-09-04 17:04:34,460 INFO sqlalchemy.engine.base.Engine.0x..f0 [1] 2008-09-04 17:04:34,461 INFO sqlalchemy.engine.base.Engine.0x..f0 COMMIT The important thing to note about all these examples is that the code you write with the SQL Expression API will have the same effect on any of the RDBMSs that SQLAlchemy supports without you having to change any of your code. The only thing you need to change is the URI string to the create_engine() function. This automatic abstraction is a huge advantage if you are trying to write Pylons applications to work on multiple database back ends. This has been a taste of the SQL Expression API, but there is a lot more too. It is extremely powerful, allowing you to do complex joins, aliases, group bys, functions, unions, other set operations and more, all through natural-feeling Python code based on information defined through the metadata in your tables and columns. Once again, the SQLAlchemy documentation is the best place to go to learn about all the features: http://www.sqlalchemy.org/docs/05/sqlexpression.html

In such a network, phones connect to a switch (central office) that directs calls If someone wants to attack your ability to place phone calls, he might cut the telephone line that connects to that particular central office, and as a result you would not be able to make calls Attackers sometimes cut off a victim s ability to communicate prior to launching an attack One potential way to avoid single points of failure is to add redundancy (Note that we are referring to a different type of redundancy than the redundancy we referred to in our discussion of message integrity) A second switch can be added to the network so that if an attacker disables the first switch, the system will automatically connect you to the second Another potential DoS attack can be conducted by filling up a system s disk.

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All Qt collection classes are implicitly shared, so no copies are made of a list until it is modified. PassTip ing lists as arguments or returning lists as results is inexpensive performance and memory wise. Passing const references to lists as arguments or results is even cheaper because it guarantees that no change can be made unintentionally.

The highest-level API SQLAlchemy provides is the Object-Relational API, which is the one you will spend the majority of your time using in your Pylons applications. The API allows you to work directly with Python objects without needing to think too much about the SQL that would normally be required to work with them. Before you learn about the details of how the API works, I ll cover some key concepts about relational databases.

Let s start by looking at the QList class. Listing 1-13 shows how a list of QString objects is created and populated. Using the << operator for appending data makes it easy to fill lists with information. When the list is populated, the foreach macro is used to print the contents of the list.

As you learned earlier in the chapter, object-relational mappers (ORMs) map rows from tables in relational databases to the objects used in your Pylons application The difficulty is that Python objects don t always easily map to rows in tables Before you look at SQLAlchemy s Object-Relational API, let s take a few moments for a very quick overview of the core ideas of relational databases that you need to know to use SQLAlchemy effectively Let s consider a wiki application that allows the creation of pages, has a comments system, and allows pages to be tagged Each of the items mentioned in the previous sentence are known as entities in relational database terminology They are the main things that exist in the real world.

Suppose users are sharing a disk on a server that is used to store their photos That server may be running critical processes that need some disk space themselves If an attacker can sign up as a user (or compromise an existing account) and fill up the shared disk with his own photos (or garbage data), then the critical processes may not be able to properly function, and system failure may ensue If you impose limits on the amount of disk space that each user can use, then even if the attacker is able to compromise one user s account, he will only be able to use up a certain amount of disk space The attacker would need to compromise additional accounts to use up more disk space.

The QPainter class is the workhorse when creating custom widgets with painting logic. If you want to represent multiple independent shapes in a single document or widget, the graphics view framework is helpful. By creating a QGraphicsScene and populating it with QGraphicsItem objects, you can easily create an interactive canvas for the users. The scene can be shown using a QGraphicsView widget or just as easily printed using a QPainter for painting to a QPrinter.

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