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It doesn t take a lot of effort to understand that this code is reading in numbers for lap times and fuel levels from a couple of text files the code makes this aspect of its behavior much clearer than, say, Example 2-12. When code does what it says it does, you make life much easier for anyone who has to look at the code after you ve written it. And since that probably includes you, you ll make your life easier in the long run by moving functionality into carefully named methods.

Summary

Your colleague might not understand how to use bind variables and might hack your code as follows just to get the job done: $ps = $db->prepare( 'SELECT pizza, toppings, quantity, order_day ' 'FROM orders ' 'WHERE userid= AND order_month= AND order_year=$year'); $ps->execute(array($current_user_id, $month)); Now, even though bind variables are used for the $month parameter, and that parameter is therefore safe from SQL injection, the $year parameter is directly inserted into the query before it is parsed As such, the query is now vulnerable to SQL injection via the $year parameter This example again illustrates that mechanisms to prevent SQL injection, such as bind variables or escaping combined with data validation, must be applied consistently A good way to ensure this is to introduce into your application s architecture a separate module dedicated to facilitating database access.

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In this chapter, we looked at some of the most important concepts involved in the everyday writing of C#. We saw how to create and run projects in Visual Studio. We saw how namespaces help us work with the .NET Framework class library and other external code, without getting lost in the thousands of classes on offer. We used variables and expressions to store and perform calculations with data. We used selection statements to make decisions based on input, and iteration statements to perform repetitive work on collections of data. And we saw how splitting your code into wellnamed methods can enhance the reusability and readability of your code. In the next chapter, we ll step outside the world of methods and look at C# s support for objectoriented programming.

In the previous couple of chapters, we looked at some basic programming techniques such as loops and conditions, and used some of the data types built into the language and platform, such as int and string. Unfortunately, real programs even fairly simple ones are much, much more complicated than the examples we ve built so far. They need to model the behavior of realworld objects like cars and planes, or ideas like mathematical expressions, or behaviors, like the transaction between you and your favorite coffee shop when you buy a double espresso and a brownie with your bank card.

The best way to manage this complexity is to break a system down into manageable pieces, where each piece is small enough for us to understand completely. We should aim to craft each piece so that it fits neatly into the system as a whole with a small enough number of connections to the other pieces that we can comprehend all of those too.

Parallel LINQ (PLINQ) is a LINQ provider that enables any IEnumerable<T> to be processed using normal LINQ query syntax, but in a way that works in parallel. On the face of it, it s deceptively simple. This:

var pq = from x in someList where x.SomeProperty > 42 select x.Frob(x.Bar);

For example, such a module could at application startup initialize a table of prepared statements from static strings A coding style guideline would dictate that rather than invoking prepareStatement itself, application code must call this module to retrieve a prepared statement object for a desired query Compliance with the coding style is very easy to check: the prepared-statement manager module must be the only module that calls prepareStatement and invokes methods for creating database connections,7 which can be.

will use LINQ to Objects, assuming that someList implements IEnumerable<T>. Here s the PLINQ version:

var pq = from x in someList.AsParallel() where x.SomeProperty > 42 select x.Frob(x.Bar);

If you want to make the changes permanent, click the Save button. To restore the mashup s original settings, click the Reset button. If you want to make more significant changes than Tweak It allows, click the More button to go to the mashup creator.

The only difference here is the addition of a call to AsParallel, an extension method that the ParallelEnumerable class makes available on all IEnumerable<T> implementations. It s available to any code that has brought the System.Linq namespace into scope with a suitable using declaration. AsParallel returns a ParallelQuery<T>, which means that the normal LINQ to Objects implementation of the standard LINQ operators no longer applies. All the same operators are available, but now they re supplied by ParallelEnumerable, which is able to execute certain operators in parallel.

Not all queries will execute in parallel. Some LINQ operators essentially force things to be done in a certain order, so PLINQ will inspect the structure of your query to decide which parts, if any, it can usefully run in parallel.

6. Though not shown here, PHP also supports explicitly typed bind variables, similarly to the Java API. 7. The module should not have any public methods that return an initialized database connection object.

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