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Another place where you will have to think about encoding and decoding is the database. You should encode to whichever encoding the database expects immediately before executing a query and decode to Unicode immediately after receiving results from the database. SQLAlchemy has a Unicode column type that you can use to store Unicode characters. If you use this column type, SQLAlchemy will be responsible for handling the encoding and decoding for you so that you don t need to worry about it yourself. If you look back at the model for the SimpleSite application, you ll see that you have already been using Unicode columns. This is good practice because you never know when a user of your application might place a non-ASCII character in a form field, and it is best to be able to handle that situation.

Note To access the QObject class, the header file <QObject> has to be included. This works for most Qt classes; simply include a header file with the same name as the class, omitting the .h, and everything should work fine.

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Now that you ve seen the various places your Pylons applications might have to deal with Unicode, I ll take you through an example request cycle and explain exactly what happens in terms of encoding and decoding Unicode Start the SimpleSite application, and edit a page by visiting http://localhost:5000/page/ view/1 Try copying and pasting some Chinese or Arabic text into the content field (Just search Google for the words Arabic or Chinese characters, and some of the results are bound to contain suitable sample text) When you save the page, the text will be sent to your application as UTF-8 (since this is the encoding of the page) Pylons will then receive the request, and the form fields will be decoded to Unicode in the Pylons request global The code within the view() action then retrieves the value of the content field from request.

Let s say the SQL query could be rewritten as follows: sql_query = "SELECT pizza, toppings, quantity, order_day " + "FROM orders " + "WHERE userid=" + sessiongetCurrentUserId() + " " + "AND toppings LIKE '%" + kill_quotes(requestgetParameter("topping")) + "%'"; The kill_quotes() method would eliminate each occurrence of a single-quote character If the kill_quotes() method were implemented in Java, it might look as follows: String kill_quotes(String str) { StringBuffer result = new StringBuffer(strlength()); for (int i = 0; i < strlength(); i++) { if (strcharAt(i) != '\'') resultappend(strcharAt(i)); } return resulttoString(); } The kill_quotes() method iterates through each character of its input string (str), and copies over each character that is not a quote to the output string (result) This is a blacklistingbased approach in which the quote character is blacklisted, or eliminated, from the input string.

The parent argument is simply passed on to the QObject constructor like this: MyClass::MyClass( const string& text, QObject *parent ) : QObject( parent ) Let s look at the effects of the change, starting with Listing 1-3. It shows a main function using the MyClass class dynamically without Qt. Listing 1-3. Dynamic memory without Qt #include <iostream> int main( int argc, char **argv ) { MyClass *a, *b, *c; a = new MyClass( "foo" ); b = new MyClass( "ba-a-ar" ); c = new MyClass( "baz" ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; a->setText( b->text() ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; int result = a->getLengthOfText() - c->getLengthOfText(); delete a; delete b; delete c; return result; } Each new call must be followed by a call to delete to avoid a memory leak. Although it is not a big issue when exiting from the main function (because most modern operating systems free the memory when the application exits), the destructors are not called as expected. In locations other than loop-less main functions, a leak eventually leads to a system crash when the system runs out of free memory. Compare it with Listing 1-4, which uses a parent that is automatically deleted when the main function exits. The parent is responsible for calling delete for all children and ta-da! the memory is freed.

params where it has already been decoded to a Unicode string It then sets the content attribute of the page object using the Unicode value When the session is committed, the page object is automatically flushed SQLAlchemy takes over and performs the necessary encoding before sending the content to the underlying database engine When the saved page is redisplayed, SQLAlchemy will issue a query to fetch the content and decode the results it fetches to Unicode The page s content data is passed as a Unicode string to a Mako template where it is rendered The render() function will obtain the result from Mako and return the entire template as a UTF-8 encoded string, which is then returned from the view() action Pylons assembles the response using the UTF-8 encoded response from the action and any settings in the response global Because response.

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