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Encoding Universal Product Code version A in VS .NET SQL Server 2005 Architecture and Internals

Appendix B
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using System.Data.SqlTypes; using Microsoft.SqlServer.Server;
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public partial class StoredProcedures { [Microsoft.SqlServer.Server.SqlProcedure] public static void SqlPipeTest() { // Connect through the context connection. using (SqlConnection connection = new SqlConnection("context connection=true")) { connection.Open(); SqlCommand command = new SqlCommand( "SELECT VendorID, AccountNumber, Name FROM Purchasing.Vendor " + "WHERE CreditRating <= @rating", connection); command.Parameters.AddWithValue("@rating", rating); // Execute the command and send the results directly to the client. SqlContext.Pipe.ExecuteAndSend(command); } } } 'VB <Microsoft.SqlServer.Server.SqlProcedure()> _ Public Shared Sub StoredProcExecuteCommand(ByVal rating As Integer) Dim command As SqlCommand ' Connect through the context connection Using connection As New SqlConnection("context connection=true") connection.Open() command = New SqlCommand( _ "SELECT VendorID, AccountNumber, Name FROM Purchasing.Vendor " & _ "WHERE CreditRating <= @rating", connection) command.Parameters.AddWithValue("@rating", rating) ' Execute the command and send the results directly to the client SqlContext.Pipe.ExecuteAndSend(command) End Using End Sub
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The code uses a SqlConnection and a SqlCommand to execute a stored procedure and then return the data to the client using a SqlPipe object. This is a very simple example of the infrastructure required to return data to client applications from within CLR objects. The SqlPipe object coupled with the context connection enables all data access to be maintained within the SQLOS process. This has a very succinct advantage over using XPs to accomplish similar tasks. In previous releases of SQL Server, XPs were the only alternative to
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T-SQL with which to write server-side code with logic that was difficult to write in T-SQL. CLR integration provides a more robust alternative to XPs. In addition, with CLR integration, many stored procedures can be better expressed as table-valued functions, enabling them to be invoked and manipulated using the query language. Following are some of the benefits of using CLR procedures rather than XPs:
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Security control. SQL Server administrators have little control over what XPs can or cannot do. Using the Code Access Security (CAS) model, a SQL Server administrator can assign one of three permission buckets SAFE, EXTERNAL_ACCESS, or UNSAFE to exert varying degrees of control over the operations that managed code is permitted to perform. Reliability. Managed code, especially in the SAFE and EXTERNAL_ACCESS permission sets, provides a more reliable programming model than XPs do. Verifiable managed code ensures that all access to objects is performed through strongly typed interfaces, reducing the likelihood that the program accesses or corrupts memory buffers belonging to SQL Server. Data access. With XPs, an explicit connection back to the database a loop-back connection must be made to access the local SQL Server database. In addition, this loop-back connection must be explicitly bound to the transaction context of the original session to ensure that the XP participates in the transaction in which it is invoked. Managed CLR code can access local data using a more natural and efficient programming model that takes advantage of the current connection and transaction context. Additional data types. The managed APIs support new data types (such as XML, (n)varchar(max), and varbinary(max)) introduced in SQL Server 2005, while the ODS APIs have not been extended to support these new types. Scalability. The managed APIs that expose resources such as memory, threads, and synchronization are implemented on top of the SQL Server resource manager, enabling SQL Server to manage these resources for CLR code. Conversely, SQL Server has no view or control over the resource usage of an XP. If an XP consumes too much CPU time or memory, there is no way to detect or control this from within SQL Server. With CLR code, SQL Server can detect that a given thread has not yielded for a long period of time and force the task to yield so that other work can be scheduled. Consequently, using managed code provides for better scalability and robustness.
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As mentioned above, CLR routines can outperform XPs when the intent is to simply obtain some data and return it to the client. For code that does not involve data access or sending results, comparing the performance of XPs and managed code is a matter of comparing managed code with native code. In general, managed code cannot beat the performance of native code in these scenarios. Furthermore, there is an additional cost during transitions
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