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Inside Microsoft SQL Server 2008: T-SQL Querying
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The need for an aggregate product is common in nancial applications for example, to calculate compound interest rates.
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SQL Server allows you to create your own user-de ned aggregates (UDAs). You write UDAs in a .NET language of your choice (for example, C# or Visual Basic), and you use them in T-SQL. This book is dedicated to T-SQL and not to the common language runtime (CLR), so I won t explain CLR UDAs at great length. Rather, I ll provide you with a couple of examples with step-by-step instructions and, of course, the T-SQL interfaces involved. Examples are provided in both C# and Visual Basic.
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This section discusses .NET common language runtime (CLR) integration in SQL Server; therefore, it s appropriate to spend a couple of words explaining the reasoning behind CLR integration in a database. It is also important to identify the scenarios where using CLR objects is more appropriate than using T-SQL. Developing in .NET languages such as C# and Visual Basic gives you an incredibly rich programming model. The .NET Framework includes literally thousands of prepared classes, and it is up to you to make astute use of them. .NET languages are not just data oriented like SQL, so you are not as limited. For example, regular expressions are extremely useful for validating data, and they are fully supported in .NET. SQL languages are set oriented and slow to perform row-oriented (row-by-row or one-row-at-a-time) operations. Sometimes you need row-oriented operations inside the database; moving away from cursors to CLR code should improve the performance. Another bene t of CLR code is that it can be much faster than T-SQL code for operations such as string manipulation and iterations and in computationally intensive calculations. SQL Server 2005 introduced CLR integration, and SQL Server 2008 enhances this integration in a number of ways. Later in this section I ll describe the enhancements that are applicable to UDAs. Although SQL Server supported programmatic extensions even before CLR integration was introduced, CLR integration in .NET code is superior in a number of ways. For example, you could add functionality to earlier versions of SQL Server (before 2005) using extended stored procedures. However, such procedures can compromise the integrity of SQL Server processes because their memory and thread management is not integrated well enough with SQL Server s resource management. .NET code is managed by the CLR inside SQL Server, and because the CLR itself is managed by SQL Server, it is much safer to use than extended procedure code.
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T-SQL a set-oriented language was designed to deal mainly with data and is optimized for data manipulation. You should not rush to translate all your T-SQL code to CLR code. T-SQL is still SQL Server s primary language. Data access can be achieved through T-SQL only. If an operation can be expressed as a set-oriented one, you should program it in T-SQL. You need to make another important decision before you start using CLR code inside SQL Server. You need to decide where your CLR code is going to run at the server or at the client. CLR code is typically faster and more exible than T-SQL for computations, and thus it extends the opportunities for server-side computations. However, the server side is typically a single working box, and load balancing at the data tier is still in its infancy. Therefore, you should consider whether it would be more sensible to process those computations at the client side. With CLR code, you can write stored procedures, triggers, user-de ned functions, user-de ned types, and user-de ned aggregate functions. The last two objects can t be written with declarative T-SQL; rather, they can be written only with CLR code. A user-de ned type (UDT) is the most complex CLR object type and demands extensive coverage.
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More Info For details about programming CLR UDTs, as well as programming CLR routines,
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