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  SQL Server Tips by Gama and Naughter

Hello World in VB.NET

This sample is a function that will return a string. The function is implemented within a class and the class is part of a namespace (a namespace is a way of grouping a collection of classes). The code will be compiled into a .NET DLL (which is called an Assembly).

imports System
imports System.data.sql
imports System.data.sqlserver
namespace HelloWorldNameSpace
public class HelloWorldClass
<SqlFunction()> public shared function HelloWorld() as string
return "Hello World!"
end function
public sub new()
end sub
end class
end namespace

The code can be saved anywhere as long as the DLL is created in the Binn folder under the folder where SQL Server 2005 is installed. Let us assume the default: C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn
After the DLL is created, it needs to be registered. This is done from the Script Editor with the following command:

CREATE ASSEMBLY HelloWorldNameSpace FROM 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\HelloWorld.DLL'
WITH PERMISSION_SET = UNSAFE


The function from the assembly must be mapped to an internal UDF:

CREATE FUNCTION udfHelloWorld() returns nvarchar(4000)
as external name [HelloWorldNameSpace].[HelloWorldNameSpace.HelloWorldClass].HelloWorld


Now, the function can be used from SQL Server:

SELECT dbo.udfHelloWorld()

The result is:
Hello World!

To remove the function is very straightforward:

DROP FUNCTION udfHelloWorld

To remove the assembly:

DROP ASSEMBLY HelloWorldNameSpace


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm
 

 

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