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For example, in this API call: foo.objects.filter(bar__exact="' OR 1=1") Django will escape the input accordingly, resulting in a statement like this: SELECT * FROM foos WHERE bar = '\' OR 1=1' Completely harmless. This applies to the entire Django database API, with a couple of exceptions: The where argument to the extra() method (see Appendix C). That parameter accepts raw SQL by design. Queries done by hand using the lower-level database API. In each of these cases, it s easy to keep yourself protected. In each case, avoid string interpolation in favor of passing in bind parameters. That is, the example we started this section with should be written as follows: from django.db import connection def user_contacts(request): user = request.GET['username'] sql = "SELECT * FROM user_contacts WHERE username = %s;" cursor = connection.cursor() cursor.execute(sql, [user]) # ... do something with the results The low-level execute method takes a SQL string with %s placeholders and automatically escapes and inserts parameters from the list passed as the second argument. You should always construct custom SQL this way. Unfortunately, you can t use bind parameters everywhere in SQL; they re not allowed as identifiers (i.e., table or column names). Thus, if you need to, say, dynamically construct a list of tables from a POST variable, you ll need to escape that name in your code. Django provides a function, django.db.backend.quote_name, which will escape the identifier according to the current database s quoting scheme.



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' Create typed table Dim customers As Table(Of Customers) = db.GetTable(Of Customers)()

The lesson is this: Telephone numbers (and other numbers that may contain leading zeros) should be represented as strings of digits not integers.





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There s a whole host of other types of content you can generate in Python. Here are a few more ideas and some pointers to libraries you could use to implement them: ZIP files: Python s standard library ships with the zipfile module, which can both read and write compressed ZIP files. You could use it to provide on-demand archives of a bunch of files, or perhaps compress large documents when requested. You could similarly produce TAR files using the standard library tarfile module. Dynamic images: The Python Imaging Library (PIL; http://www.pythonware.com/ products/pil/) is a fantastic toolkit for producing images (PNG, JPEG, GIF, and a whole lot more). You could use it to automatically scale down images into thumbnails, composite multiple images into a single frame, or even do Web-based image processing. Plots and charts: There are a number of incredibly powerful Python plotting and charting libraries you could use to produce on-demand maps, charts, plots, and graphs. We can t possibly list them all, so here are a couple of the highlights: matplotlib (http://matplotlib.sourceforge.net/) can be used to produce the type of high-quality plots usually generated with MatLab or Mathematica. pygraphviz (https://networkx.lanl.gov/wiki/pygraphviz), an interface to the Graphviz graph layout toolkit (http://graphviz.org/), can be used for generating structured diagrams of graphs and networks. In general, any Python library capable of writing to a file can be hooked into Django. The possibilities really are endless. Now that we ve looked at the basics of generating non-HTML content, let s step up a level of abstraction. Django ships with some pretty nifty built-in tools for generating some common types of non-HTML content.

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A typed table is a collection (of type System.Data.Dlinq.Table(Of T)) whose elements are of a specific type. The GetTable method of the data context specifies the data context to access and where to put the results. Here, you got all the rows (but only four columns) from the Customers table and the data context created an object for each row in the customers typed table.

s Data contexts can be strongly typed, and that s the recommended way to use them, but we intentionTip

Django comes with a high-level syndication feed generating framework that makes creating RSS and Atom feeds easy.

ally didn t do that so we d have to explicitly create a typed table and show you how to load it. See DLinq Overview for VB Developers.doc, section 2.2, to learn how to define a strongly typed data context.

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