Сохранить BLOB-поле в файл

DECLARE @BufLen [int]
DECLARE @BufPos [int]
DECLARE @Buffer [varbinary](4096)
DECLARE @Stream [int]
DECLARE @HR [int]

SELECT @BufPos = 1, @BufLen = DATALENGTH(MyField) FROM MyTable WHERE SomeField=@SomeID

EXEC @HR = sp_OACreate 'ADODB.Stream',@Stream OUT 
EXEC @HR = sp_OASetProperty @Stream,'Type',1
EXEC @HR = sp_OAMethod @Stream,'Open' 

WHILE @BufLen > 0 
BEGIN
  SELECT @Buffer = SUBSTRING(MyField,@BufPos,4096) FROM MyTable WHERE SomeField=@SomeID
  EXEC @HR = sp_OAMethod @Stream,'Write',null,@Buffer
  SELECT @BufLen = @BufLen - 4096, @BufPos = @BufPos + 4096
END

EXEC @HR = sp_OAMethod @Stream, 'SaveToFile',Null,@Filename,2
EXEC @HR = sp_OAMethod @Stream, 'Close'
EXEC @HR = sp_OADestroy @Stream