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If you were creating lots of pages at once, you could use session.add_all([test_page1, test_page2, test_page3]) instead. SQLAlchemy 0.4 used session.save() instead but session.add() is the correct method to use for SQLAlchemy 0.5 and above. At this stage, objects added to the session are still pending, and no SQL has been issued or echoed to the console. Let s see what happens when you access the test_page object s .id attribute: >>> print test_page.id None As you can see, it returns None. You ll remember from the table definition that id is the page table s primary key column and that an id value is automatically assigned by the underlying RDBMS when the row is created. At this stage, although test_page has been added to the session, its data hasn t been sent to the underlying RDBMS. You can force this to happen by flushing the session. Once the session has been flushed, the SQL is sent, and SQLAlchemy finds out the id of the page: >>> session.flush() 2008-09-04 20:53:55,191 INFO sqlalchemy.engine.base.Engine.0x..90 BEGIN 2008-09-04 20:53:55,193 INFO sqlalchemy.engine.base.Engine.0x..90 INSERT INTO page (content, posted, title, heading) VALUES ( , , , ) 2008-09-04 20:53:55,194 INFO sqlalchemy.engine.base.Engine.0x..90 [u'Test content', '2008-09-04 20:53:55.193033', u'Test Page', None] As you can see, SQLAlchemy has now sent the INSERT statement to the SQLite database, but the interesting thing is that it also sent the SQL keyword BEGIN before it sent the INSERT statement. This starts a transaction within the RDBMS so that any changes can still be rolled back until they are committed. It also means that the changes won t yet be visible to other users.

When everything is set up, it is just a matter of sending the list to the stream by using the << operator and closing the file All the details are sorted out by the different layers of << operators being called directly and indirectly for QList, ColorText, QString, and QColor Listing 8-7 Saving a list of ColorText items QList<ColorText> list; ColorText data; datatext = "Red"; datacolor = Qt::red; list << data;.

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In the previous section, we assumed that at least either Alice or Bob had generated asymmetric keys and had a public key certificate3 However, what if Alice and Bob did not have public key certificates Could they still exchange a symmetric key over an insecure channel that they would know, but that Eve would not While it may not intuitively seem possible, it is possible due to a key exchange protocol invented by Whit Diffie and Martin Hellman The DH key exchange protocol allows two parties to agree upon a key without meeting or relying on an alternate secure channel We now describe how DH works In DH, both Alice and Bob execute the key exchange protocol using some public parameters g and p that are known to all users, where p is a (large) prime number and g is a generator (sometimes called a primitive element).

Some RDBMSs don t support transactions and therefore cannot roll back data or hide it from other users after it has been flushed. MySQL s default MyISAM tables don t support transactions, so if you need this functionality, you should use InnoDB tables instead. If you are using MySQL, you can specify this by adding mysql_engine='InnoDB' to your Table classes. See http://www.sqlalchemy.org/docs/05/ documentation.html#metadata_tables_options for more information.

Before you can start working with plugins, you need to understand how a plugin works. To a Qt application a plugin is just another instance of a class. The methods available are determined by an interface class. An interface class usually contains only pure virtual methods, so no functions are implemented in the interface class. The plugin then inherits the QObject class and the interface class and implements all the methods with their specific functionality. When the application loads a potential plugin with the QPluginLoader class, it gets a QObject pointer. By attempting to cast the given object to the interface class using qobject_cast, the application can tell whether the plugin implements the expected interface and can be treated as an actual plugin. For the QPluginLoader to work properly the interface class must be declared an interface by using the Q_DECLARE_INTERFACE macro, and the plugins must declare that they implement an interface by using the Q_INTERFACES macro. These two macros enable you to safely match a given plugin to the right interface. It is one step in a whole range of criteria that must be fulfilled for Qt to trust the plugin. The following list contains all the checks that Qt performs when attempting to load a plugin. If any criteria are not met, the plugin is not loaded. The same version of Qt must have been used for building the plugin and the application. Qt checks that the major (4) and minor (4.2) numbers match, but the revision number (4.2.2) can differ. The plugin and application must have been built using the same compiler for the same operating system on the same platform. Versions of the compiler can differ as long as their internal architecture remains the same (for example, name mangling).

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