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Choosing Between CLR Integration and Middle-Tier Components
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As noted earlier, a common approach to implementing data-oriented procedural logic is to place it in middle-tier .NET components. Although this incurs the cost of data marshaling, it remains a viable option, even with the advent of SQL Server 2005 and CLR Integration.
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The database server is typically the most heavily taxed server in the enterprise. So, although the marshaling of data causes overhead, it also unloads the procedural processing from the database server, thus freeing precious CPU resources to do other tasks. Understanding this tradeoff is key to making the right decision about where to execute the logic. Here are a few other factors that can influence the ultimate placement of any procedural logic: The procedural logic may already be contained within the database as a stored procedure. In this case, it s generally appropriate to take advantage of CLR Integration and port the logic to a managed language. The procedural logic may represent business logic that you wish to share with other applications. This is typically easier to do if the logic is in the middle tier. The procedural logic may represent business logic that requires data from other external data sources. Obviously, this is much easier if the code is in the middle tier and can use ADO.NET to access a variety of data sources. Related to the previous case, you may wish to allow an easy transition to another database server in the future. Clearly, having a significant amount of logic contained within a SQL Server 2005 database complicates any transition to another type of database. Again, in this scenario, placing the code in middle tier components is the better option. As the preceding points show, SQL Server 2005 s CLR Integration feature does not render middle-tier components obsolete. This question, though, of where best to place data-oriented procedural logic is not new; it is simply a continuation of the age-old debate between T-SQL stored procedures and middle-tier business objects. In other words, the issues and concerns that affect your choice between CLR Integration and the middle tier are essentially the same as those that affect your choice between T-SQL stored procedures and the middle tier. The primary difference when you re considering CLR Integration versus the middle tier is that you no longer need to factor the awkwardness, difficulty, and performance concerns of expressing the procedural logic in T-SQL. So, generally speaking, if you would otherwise feel comfortable implementing the logic in a T-SQL stored procedure, then using CLR integration and a managed language is an appropriate solution.
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Surveying the CLR Integration Features
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Now that we ve established the role of CLR Integration, its time to look at the specific types of managed database items this new feature supports. CLR Integration provides five different types of managed database items: Managed stored procedures: The classic stored procedure in a managed language. User-defined functions (UDFs): Return single scalar values and are generally called from queries. Table-valued functions (TVFs): Like user-defined functions, but can return a result set. User-defined aggregates (UDAs): Enable you to define your own custom aggregate function that behaves like SUM, AVG, MAX and other built-in functions. User-defined types (UDTs): Enable you to extend the SQL Server type system with your own custom type.
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In the rest of this section, we discuss each of these options in more detail and provide guidance on how to choose the best option for a particular task.
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Note The examples provided in this section use the AdventureWorks sample database, which is available
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only as a separate download and install from SQL Server 2005 and SQL Server 2005 Express.
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Managed Stored Procedures A good way to introduce CLR Integration is to start by looking at the stored procedure functionality. With this feature, you can write a stored procedure using any .NET language. Once the stored procedure is completed and deployed to the database, you can invoke it like any standard T-SQL stored procedure. The code within a managed stored procedure looks similar to any other code written in C# or VB .NET. The main difference, however, is that the logic must somehow access the internal database data and also must return result sets back to the caller. To facilitate this, SQL Server 2005 provides several interesting features. In-proc ADO.NET: This is a term used to describe the technology used to access SQL Server 2005 data from managed code running inside the database process. This technology provides data access through standard ADO.NET API calls. In other words, it contains classes like SqlCommand and SqlDataReader that you can use to query the database and read the results. SqlPipe: This class enables you to return the results of the stored procedure back to the caller. SqlContext: This class provides access to the current SQL context. Most notably, it contains a Pipe property that returns a SqlPipe object that you can use to return the results of a query to the caller. For example, the following code defines a stored procedure that returns the title, first, and last name of every row in a Contacts table. public partial class StoredProcedures { [SqlProcedure()] public static void GetContactFullName() { // Note the connection string for an in-proc connection using (SqlConnection cnn = new SqlConnection("context connection=true")) using (SqlCommand cmd = new SqlCommand( "Select Title, FirstName, LastName From Person.Contact", cnn)) { cnn.Open(); SqlCommand cmd = new SqlCommand( "Select Title, FirstName, LastName From Person.Contact", cnn);
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