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Why have we included the IS NULL condition in Listings 6-8 and 6-9 You might remember from 2 that if we make a comparison with a Null value, the result is false in SQL. If we want to find managers who aren t in a team, we need to specifically include that possibility in our query. Had the requirement been just that a manager must not belong to a different team, we could have left out the checking of Null values, because a manager with no team would have been OK. As always, clearly understanding what you are actually trying to find can be the most difficult part of formulating any query. The queries in Listings 6-8 and 6-9 will find teams with incorrect managers, but only after they have been added to the database. How do we prevent them from being added in the first place The solution depends on which database product you are using. Before changes to data are finally committed to a database, they are usually recorded in a buffer of some sort. For example, in SQL Server, the records being updated or added are kept in a temporary table called inserted. If we add or update some records to the Team table, a temporary table (inserted) that has the same structure as the Team table is created to hold the new records temporarily. We want to perform a query similar to that in Listing 6-10 to check if any of the new records have managers who don t obey the constraint. However, instead of looking at the Team table, we want to look at the records in the temporary inserted table and count how many of those are invalid.

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Expressions are just what they sound like. They are a piece of Python code that can be evaluated and produces a value. Expressions are not instructions to the interpreter, but rather a combination of values

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The .NET Framework is a set of web development technologies from Microsoft. It is the successor to Active Server Pages (ASP) and is part of the .NET platform. It features a common language runtime (CLR) that all Microsoft applications share. This means that developers can write .NET web applications in any language supported by the CLR, including C#, VB .NET, JScript .NET, Perl, and Python. I ve written the samples in this chapter in VB .NET. The .NET Framework offers a managed run-time environment. It includes a range of controls and supports data binding. Tools such as Visual Studio allow developers to work visually. Microsoft released .NET 2.0 in November 2005. It also released Visual Studio 2005 and SQL Server 2005 at the same time.

and operators that are evaluated. If we wish to perform a calculation based upon two variables or numeric values then we are producing an expression. Listing 1-9. Examples of Expressions >>> >>> >>> >>> x x x x + * / y y y y

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Listing 6-10. Part of a SQL Server Trigger to Prevent Adding Invalid Team Managers IF (SELECT COUNT(*) FROM Member m INNER JOIN inserted i ON m.MemberID = i.Manager WHERE m.Team <> i.Teamname OR m.Team IS NULL) <> 0) BEGIN

The examples of expressions that are shown above are very simplistic. Expressions can be made to be very complex and perform powerful computations. They can be combined together to produce complex results.

There are many reasons for working with the .NET Framework, including the following: The .NET Framework is free, and you can download it from the Microsoft web site. The .NET Framework runs on the Microsoft IIS web server, which is provided with many recent Windows operating systems. .NET is documented extensively on the Microsoft Developer Network (MSDN) at http://msdn.microsoft.com. .NET developers can work in a range of languages.

Oftentimes it is nice to take suites of code that perform specific tasks and extract them into their own unit of functionality so that the code can be reused in numerous places without retyping each time. A common way to define a reusable piece of code is to create a function. Functions are named portions of code that perform that usually perform one or more tasks and return a value. In order to define a function we use the def statement. The def statement will become second nature for usage throughout any Python programmer s life. The def statement is used to define a function. Here is a simple piece of pseudocode that shows how to use it. Listing 1-10. def my_function_name(parameter_list): implementation The pseudocode above demonstrates how one would use the def statement, and how to construct a simple function. As you can see, def precedes the function name and parameter list when defining a function. Listing 1-11. >>> def my_simple_function(): ... print 'This is a really basic function' ... >>> my_simple_function() This is a really basic function This example is about the most basic form of function that can be created. As you can see, the function contains one line of code which is a print statement. We will discuss the print statement in more detail later in this chapter; however, all you need to know now is that it is used to print some text to the screen. In this case, we print a simple message whenever the function is called. Functions can accept parameters, or other program variables, that can be used within the context of the function to perform some task and return a value.

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