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raising Exceptions Using Message >>> raise Exception("An exception is being raised") Traceback (most recent call last): File "<stdin>", line 1, in <module> Exception: An exception is being raised >>> raise TypeError("You've specified an incorrect type") Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: You've specified an incorrect type Now you ve surely seen some exceptions raised in the Python interpreter by now Each time an exception is raised, a message appears that was created by the interpreter to give you feedback about the exception and where the offending line of code may be There is always a traceback section when any exception is raised This really gives you more information on where the exception was raised Lastly, let s take a look at raising an exception using a different format Namely, we can use the format raise Exception, message Listing 7-18.

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n 11, you learned about many advantages to using XML on the server. You also saw that .NET has good support for XML. In this chapter, I ll work through a .NET case study, so you can see some of the techniques available to you. In this case study, I ll build a News application to display XML browser news. The application will show XML and web news from a Microsoft Access database, and users will be able to add news items. The site will make the news available as a Really Simple Syndication (RSS) 2.0 feed and will display feeds from other web sites. This application isn t intended as a secure and robust case study. Rather, it s an example of what you can achieve using .NET and XML on the server. You ll start by learning more about how the application is structured. After that, I ll work through each section of the application in detail.

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You must be very careful to think about which columns you include in the tables you are using in an intersect operation. Figure 7-13 shows what happens if we include all the columns as in Listing 7-18, instead of just projecting the MemberIDs.

Using the raise Statement with the Exception, message Syntax >>> raise TypeError,"This is a special message" Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: This is a special message.

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In this case study, I ll work with news items in a database and RSS feeds. If you re not familiar with RSS, it describes news items using an XML vocabulary. Netscape originally developed RSS, and there are actually seven different specifications. In this example, I ll focus on RSS 2.0. You can find out more about the RSS 2.0 specification at http://blogs.law.harvard.edu/ tech/rss. The application displays and manages news items stored in an Access database. It generates an RSS 2.0 feed from these news items and uses an XSLT stylesheet to display them on the home page. Users can add, edit, and delete news items. They can also view and consume the RSS feed. The application allows users to display RSS 2.0 news feeds from other web sites. The same XSLT stylesheet transforms these feeds into XHTML for display on the page.

example, we are going to walk you through the creation of a table named Player that will be used in an application example in the next section Listing 12-25 Creating a Database Table >>>player = Table('player', metadata, .. Column('id', Integer, primary_key=True), .. Column('first', String(50)), .. Column('last', String(50)), .. Column('position', String(30))) >>> metadatacreate_all(engine) Our table should now exist in the database and the next step is to create a Python class to use for accessing this table See Listing 12-26 Listing 12-26 Creating a Python Class to Access a Database Table class Player(object): def __init__(self, first, last, position): selffirst = first selflast = last selfposition = position def __repr__(self): return "<Player('%s', '%s', '%s')>" %(selffirst, selflast, selfposition) The next step is to create a mapper to correlate the Player python object and the player database table.

Listing 7-18. This Intersection Will Not Return Anything SELECT * FROM Entry WHERE TourID = 25 INTERSECT SELECT * FROM Entry WHERE TourID = 36

To do this, we use the mapper() function to create a new Mapper object binding the class and table together (Listing 12-27) The mapper function then stores the object away for future reference Listing 12-27 Create a Mapper to Correlate the Python Object and the Database Table >>> from sqlalchemyorm import mapper >>> mapper(Player, player) <Mapper at 0x4; Player> Creating the mapper is the last step in the process of setting up the environment to work with our table Now, let s go back and take a quick look at performing all of these steps in an easier way If we want to create a table, class, and mapper all at once, then we can do this declaratively Please note that with the Oracle dialect, we need to use a sequence to generate the auto-incremented id column for the table To do so, import the sqlalchemyschema.

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