Accessing FILESTREAM from an SQL CLR assembly

Posted by superware on Stack Overflow See other posts from Stack Overflow or by superware
Published on 2012-10-20T09:01:13Z Indexed on 2012/10/22 5:01 UTC
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Filed under:

sql-server

|

ADO.NET

|

filestream

|

sqlclr

I'm trying to stream FILESTREAM data from an unsafe SQL CLR assembly.

The connection string is

Data Source=LAPTOP2\SQLEXPRESS;Initial Catalog=test;Integrated Security=True;Enlist=False

When creating a new SqlFileStream (inside a SqlTransaction, of course), I'm getting:

The request is not supported

at OpenSqlFilestream.

So I decided to try native OpenSqlFilestream, but then I'm getting an invalid handle (-1) while GetLastWin32Error returns that same:

The request is not supported (ERROR_NOT_SUPPORTED).

I have also tried SqlContext.WindowsIdentity.Impersonate() with no apparent effect.

I couldn't find any documentation referencing this restriction. Is it really unsupported? If it is unsupported, is there a good reason? Does anyone know of a workaround?

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