InfoPath Dev

I tired 2 ways, But neither of them worked Stored the signature xml tag alone in SQL, Retrieve via Stored Procedure and 1) Set the XML using QRules's 6.1  SetXML Method 2) Set the XML using InfoPath 2010 Object Model ( as XML AppendChild) In both approaches, The InfoPath couldn't  ...

 My Scenario    I have an InfoPath template and the data is stored in SQL Server.  My question    Using Qrules, Can I save the Digital Signature in SQL Server (via GetXML) and populate the digital signature back to the template via (SetXML).