Manejo de Variables Dinámicas con SSIS y SQL Server

http://www.julian-kuiters.id.au/article.php/ssis-execute-sql-task-output-parameters
http://www.msbiguide.com/2013/09/input-output-and-return-values-in-ssis-execute-sql-task/
http://msdn.microsoft.com/en-us/library/ms141003.aspx