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The main configuration option you need is sqlalchemyurl This specifies the data source name (DSN) for your database and takes the format engine://username:password@host:port/ database foo=bar, where foo=bar sets an engine-specific argument named foo with the value bar Once again, this is the same setting you learned about in 7 during the discussion of engines For SQLite, you might use an option like this to specify a database in the same directory as the config file: sqlalchemyurl = sqlite:///%(here)s/databasefilesqlite Here databasefilesqlite is the SQLite database file, and %(here)s represents the directory containing the developmentini file If you re using an absolute path, use four slashes after the colon: sqlite:////var/lib/myapp/databasefilesqlite The example has three slashes because the value of %(here)s always starts with a slash on Unix-like platforms Windows users should use four slashes because %(here)s on Windows starts with the drive letter.

For MySQL, you might use these options: sqlalchemyurl = mysql://username:password@host:port/database sqlalchemypool_recycle = 3600 Enter your username, your password, the host, the port number (usually 3306), and the name of your database It s important to set the pool_recycle option for MySQL to prevent MySQL server has gone away errors This is because MySQL automatically closes idle database connections without informing the application Setting the connection lifetime to 3600 seconds (1 hour) ensures that the connections will be expired and re-created before MySQL notices they re idle pool_recycle is one of many engine options SQLAlchemy supports Some of the others are listed at http://wwwsqlalchemyorg/docs/05/dbenginehtml#dbengine_options and are used in the same way, prefixing the option name with sqlalchemy. For PostgreSQL, your DSN will usually look like this: sqlalchemy.

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Image readers and writers work with QIODevice objects so an image can be read or written from, Tip and to network streams, memory buffers, files you name it because QIODevice is the base class of the classes that manage these interfaces.

Once the CA s self-signed certificate (sometimes also called the root certificate) is constructed, it is distributed to all principals such that they all have the CA s public key. On the Internet, there are in fact many CAs, and their self-signed certificates are preinstalled in web browsers when they are shipped. Figure 15-1 shows the list of CAs that have their self-signed certificates installed in the Firefox web browser, and Figure 15-2 shows the contents of the certificate for the thawte CA. The certificate shown in Figure 15-2 and those typically used on the Internet are standardized to use a format called X.509 (Housley et al. 2002).

url = postgres://username:password@host:port/database The options are the same as for MySQL, but you don t generally need to use the pool_recycle option with PostgreSQL By default, Pylons sets up the DSN sqlalchemyurl = sqlite:///%(here)s/developmentdb, so if you don t change it, this is what will be used Whichever DSN you use, you still need to make sure you have installed SQLAlchemy along with the appropriate DB-API driver you want to use; otherwise, SQLAlchemy won t be able to connect to the database Again, see 7 for more information..

Both the reading and writing cases are shown in Figure 11-2. The figure also shows what part is Qt and what part is the plugin. The shown scenario is commonly used with Qt plugins. One is queried for what the plugin has to offer and then returns instances that perform the actual tasks. In the case of image plugins, the QImageIOPlugin is queried and returns a QImageIOHandler.

Figure 15-2. Preinstalled thawte CA certificate in Firefox A principal such as Alice can approach a CA to obtain a certificate attesting to the binding between her identity and her public key. Alice can construct the following certificate text and authenticates herself to the CA using some out-of-band mechanism (such as showing the CA her driver s license):

Once you have configured the engine, it is time to configure the model. This is easy to do; you simply add all your classes, tables, and mappers to the end of model/__init__.py. The SimpleSite application will use the structures you worked through in the previous chapter, so I won t discuss them in detail here. Change model.__init__.py to look like this:

Now you re ready to have a look at the ASCII art image plugin that can handle text images; the format is called ti. You ll also tell Qt to use ti as the preferred file extension for these text images. The TextImagePlugin class inherits from the QImageIOPlugin class, while the TextImageHandler inherits the QImageIOHandler class (nothing else is in the plugin). Let s start looking at the code, beginning with the class declaration of the TextImagePlugin in Listing 11-1. The interface consists of three methods: keys, capabilities, and create. The keys method returns a QStringList of the image formats that the plugin supports. The capabilities method takes a QIODevice and an image format as arguments and then returns a value indicating whether the plugin CanRead or CanWrite the specified format to or from the given device. The last method, create, creates a QImageIOHandler for a given device and format.

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