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//C# using using using using
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System; System.Data; Microsoft.SqlServer.Server; System.Data.SqlTypes;
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public class CLRStoredProc { [Microsoft.SqlServer.Server.SqlProcedure] public static void GetTomorrowsDate() { System.DateTime tomorrow = System.DateTime.Now; System.TimeSpan ts = new System.TimeSpan(1, 0, 0, 0); SqlContext.Pipe.Send(Convert.ToString(tomorrow.Add(ts))); } } 'VB Imports Imports Imports Imports
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System System.Data Microsoft.SqlServer.Server System.Data.SqlTypes
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Public Class CLRStoredProc <Microsoft.SqlServer.Server.SqlProcedure> _ Public Shared Sub GetTomorrowsDate() Dim tomorrow As System.DateTime tomorrow = System.DateTime.Now() Dim ts As New System.TimeSpan(1, 0, 0, 0) SqlContext.Pipe.Send(Convert.ToString(tomorrow.Add(ts))) End Sub End Class
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Notice that the CLRStoredProc method uses the SqlContext object to send a command through the SQL pipe. The SQLContext object is used to provide access to the context of the caller while the managed code executes in the SQL Server. The SqlPipe is one of three objects available through the SqlContext. This represents the pipe in which results flow back to the client. You can execute any one of the following methods:
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Send Used to send data straight to the client. The data can either be a result set using
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a SqlDataReader object or a string message.
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ExecuteAndSend Used to execute a command using a command object and then send
the results back to the client. SendResultsStart Used to send data that did not originate from a SqlDataReader object back to a client. Accepts a SqlDataRecord object as input and marks the beginning of the result set.
Lesson 1: Scale Database Applications
SendResultsRow Used in conjunction with SendResultsStart to send a row of data back
to the client.
SendResultsEnd
Used in conjunction with SendResultsStart and SendResultsRow to send data back to the client. This method is used to set SqlPipe back to its original state.
SQL Server provides command-line compilers that can be used to generate an assembly from a code file. If you are using Visual Basic, you will use vbc.exe, and if you are using C#, you will use csc.exe. To use the compiler, go to a Visual Studio 2005 Command Prompt and enter a command such as the following example. Replace <dir> with the location that you ve created for testing this example. You also have the option of creating a directory named c:\TK442\8\Code\Lab1, which will be used in a lab exercise later in the chapter.
//C# csc /target:library .<dir>\SQLStoredProc.cs 'VB vbc /target:library <dir>\SQLStoredProc.vb
By executing the compiler, you will generate a dynamic-link library (DLL) file that is placed in the target library by default, <dir>\. You will then need to create an assembly in SQL Server that lets you access the stored procedure. You do so by executing a Transact-SQL statement, such as the following, from a new query window:
Use AdventureWorks; CREATE ASSEMBLY SQLStoredProc from <dir>\SQLStoredProc.dll' WITH PERMISSION_SET = SAFE
The final step is to create a stored procedure that references the SQLStoredProc assembly. For example, the following Transact-SQL statement can be used to reference the assembly using its external name:
Use AdventureWorks; CREATE PROCEDURE GetTomorrowsDate AS EXTERNAL NAME SQLStoredProc.CLRStoredProc.GetTomorrowsDate
Now that the procedure has been created, we can execute it just like any Transact-SQL stored procedure. For example, the following Transact-SQL statement will return tomorrow s date in the messages window:
EXEC GetTomorrowsDate
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It has long been established that Transact-SQL is a set-based language and not an object-oriented one. For this reason alone, you should restrict the amount of complex business logic that resides in Transact-SQL stored procedures, user-defined functions, and triggers. Even though there are scenarios where Transact-SQL performs more quickly than code in the .NET Framework, it is generally best to restrict use of Transact-SQL for queries. (For more information about this, refer to Lesson 2, Designing a Cursor Strategy and Lesson 3, Designing Efficient Cursors, in 3, Designing a Cursor and Caching Strategy. ) SQL Server 2005 introduced the ability to execute .NET Framework code on SQL Server, which we covered in the previous section. Now that you have this option, you might need to consider whether moving some of the business logic to the database server is a good idea. SQLCLR is not a magic bullet, and just because it is offered does not mean you should rewrite all your code to utilize it. If you just need to retrieve data, then it is quicker and more efficient to use Transact-SQL. However, if you need to retrieve data and perform complex operations against that data, then SQLCLR might be a better option.
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