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CLR Integration in SQL Server 2005
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Perhaps the most anticipated new SQL Server 2005 feature (at least from a developer s perspective) is dubbed CLR Integration, and enables managed code to execute within the SQL Server 2005 process and interact directly with the data. This means that you can write stored procedures and user-defined functions using any .NET language while leveraging the rich set of functionality provided by the .NET Framework classes. You can even extend the SQL Server type system by creating your own custom data types. But don t throw out all your T-SQL books yet! It turns out that CLR Integration is intended to complement traditional database development rather than replace it. So the real question regarding CLR Integration is when do you use it versus traditional database techniques such as T-SQL stored procedures To help you answer this question, in this section, we ll go over the nature and capabilities of CLR integration and compare them with conventional database approaches.
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Comparing Managed Code and Transact-SQL
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Traditionally, SQL Server database development is done in Transact-SQL (T-SQL). This language is designed to make it easy to write database queries such as selects, inserts, deletes, and updates. In fact, such queries in T-SQL are syntactically similar to everyday English. Furthermore, T-SQL has many built-in functions that perform calculations on a particular column of a table for a set of selected rows. For example, this T-SQL query averages the unit price of all products in each category. SELECT Categories.CategoryName, AVG(Products.UnitPrice) FROM Products INNER JOIN Categories ON Products.CategoryID = Categories.CategoryID GROUP BY Categories.CategoryName This demonstrates the power of T-SQL. In one statement, this code joins the Products and Categories tables by their respective CategoryID columns, computes the average UnitPrice for all products in each category, and then returns the calculated average UnitPrice for each category. That is quite a bit of work from one (albeit long) statement. Overall, this code demonstrates the effectiveness of T-SQL s set-oriented capabilities, which enable you to quickly and easily work with, filter, relate, and perform calculations on sets of data. Indeed, T-SQL excels at processing sets of data, which is not surprising given the fact that it is, after all, a database language. T-SQL also has many language constructs that are similar to those of a typical procedural programming language. These include WHILE loops, variable declaration and assignment, cursors, decision branching (IF/ELSE, CASE), etc. However, although T-SQL excels at setoriented processing, its procedural capabilities pale in comparison to most general purpose languages, particularly .NET languages such as C# or VB .NET. Furthermore, since T-SQL is an interpreted language, the execution of procedural logic is much slower than the execution of equivalent logic in a compiled language, such as C++, or even in a just-in-time (JIT) compiled language, such as any of those found in .NET. For these reasons, database programmers have always strived to fully leverage the set-oriented features of T-SQL, while resorting to its procedural constructs only when necessary.
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In many cases, the required procedural logic isn t implemented within the database at all. Instead, it is placed within a .NET middle-tier component. This approach frees the SQL Server process to concentrate on what it does best: process sets of data. It also enables the .NET developer to leverage the rich procedural and object-oriented features of any managed .NET language and the full set of functionality provided by the .NET Framework classes. The downside to this approach, however, is that it results in more data marshaling costs as the data must be moved out of the SQL Server process and into the middle-tier component and vice versa.
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Understanding the Role of CLR Integration
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Before CLR Integration, the state of database programming was less than ideal. T-SQL works great for set-oriented tasks, but it is difficult to work with and slow for procedural tasks. .NET languages can provide the necessary procedural logic, but only at the expense of marshaling the data in and out of the SQL Server database. CLR Integration provides an elegant solution to this problem. SQL Server 2005 can host the CLR and, therefore, can execute managed code in process. This provides the following benefits: Instead of struggling with the limited procedural constructs of T-SQL, database developers can take advantage of all the capabilities of a managed .NET language such as C# or VB .NET. These languages provide modern procedural and object-oriented features, making it much easier to develop and reuse complex procedural logic. The JIT compilation scheme these languages employ also performs much better than T-SQL interpretation. When writing database code in a managed language, you can access all the functionality of the .NET Framework. The Framework contains thousands of useful classes, many of which provide functionality that s missing from and difficult to implement in T-SQL. For example, the Framework provides rich string handling, regular expressions, cryptography, XML processing, image manipulation, file access, and much, much more. Since the managed code executes within the SQL Server process, there is no need to marshal data across process. Therefore, this is more efficient than using middle-tier components to implement the procedural logic. In fact, SQL Server 2005 has a new server-side ADO.NET data provider that enables you to use standard ADO.NET calls to access the data. In this way, you get the performance benefits of direct data access while using a familiar programming model. Remember, despite all these advantages, T-SQL remains the preferred mechanism for implementing set-oriented logic. CLR Integration, on the other hand, provides a better approach to implementing tasks that require complex procedural logic or tasks that would benefit from the functionality found in the .NET Framework classes.
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