SQL Server 2005 CLR integration and assembly registering troubles

For the first time in my life I’m playing around with the new SQL Server 2005 .NET CLR integration. A mouth full, as everything with Microsoft.

The most easy way is to start a new DatabaseSQL Server Project. You then right-click the project and select to add a “Stored Procedure…”. In your newly created class you can produce something like this: 

[Microsoft.SqlServer.Server.SqlProcedure]
public static void MyFirstStoredProcedure()
{
  SqlContext.Pipe.Send("dude!");
}

After that, look in the “Test Scripts” directory and find the Test.sql script. In it you’ll want exactly one line.

exec MyFirstStoredProcedure

If you haven’t done so already, enable CLR integration in SQL Server 2005.

sp_configure 'clr enabled', 1
GO
RECONFIGURE
GO

Next step is just hit F5, but only when you have SQL Server 2005 on the machine you’re working on. On my machine, it sometimes completely locks up, but comes back after a minute or so. Great huh?

In your output window you should see the “dude!” message. Let’s see how we can enable this on a server that’s not locally run. With Management Studio you connect to the remote server. If you haven’t changed the name of your project, it’ll be ‘SqlServerProject1’. Let’s register it.

IF EXISTS (SELECT * FROM sys.assemblies WHERE [name] = 'SqlServerProject1')
DROP ASSEMBLY [SqlServerProject1]
GO
 
CREATE ASSEMBLY SqlServerProject1 
FROM 'C:projectsSqlServerProject1binDebugSqlServerProject1.dll'
WITH PERMISSION_SET = SAFE;
GO;

Now in the above code, you can see the exact command to remove the assembly if it already existed (which isn’t very likely 😉 and to register it. However, when creating this post, at some point this didn’t work anymore. I’ll come back to this, but in the meanwhile while you get an error, it’s also possible to register your assembly in Management Studio. When you go to your database, open the “Programmability” folder, and then “Assemblies”. Right-click it and choose to add your assembly.

Now let’s register our Stored Procedure.

CREATE PROCEDURE StoredProcedure1
AS EXTERNAL NAME SqlServerProject1.[SqlServerProject1].MyFirstStoredProcedure;

When you go look for your StoredProc, you can see a little lock symbol in the icon. That’s because we registered the assembly with permission to safe, so the asssembly can’t access the drive, registry, etc.

Now you have a C# Stored Procedure in SQL Server 2005. However, that’s not why I was initially writing this post. I just kept getting errors registering my assembly and could not figure out why. The error was :

Could not impersonate the client during assembly file operation

After searching Google, it should have something to do with not being able to access the file or something. But it happened to me all the time when I was trying to register my assembly on the remote SQL Server. Even when I used an incorrect path to my assembly. I started to think they used the following code to register assemblies.

public void RegisterAssembly(string fullPath)
{
  try
  {
    // code to register assembly
  }
  catch 
  {
    // Console.WriteLine("Dude, something went wrong!");
    Console.WriteLine("Could not impersonate the client during assembly file operation");
  }
}

 For some reason it works now and the error doesn’t return, hopefully.

If you want more info on SQL CLR integration, download some samples here.

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