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I also would like to know about this as a future option. Commenting to follow responses.
Not sure if I understand that correctly. Would you like to fetch or pull data from your own SQL server database, then submit it directly on your form?
Here's how I can see this possible:
1. Get or user your form's full source code. Here's a guide that you can follow: http://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form
2. Create a script that will fetch data from your own database and populate them in the form's input fields.
3. Click the submit button, the data will then be sent to our servers.
You can prepopulate the form fields using the URL parameters. Here's a guide that you can follow: http://www.jotform.com/help/71-Prepopulating-fields-to-your-JotForm-via-URL-parameters
You can prepopulate it by fetching the data in your own database and redirect the user to a prepopulated form URL.
I'm not sure if I understand your process flow correctly, if you can share us more information on this, please do let us know.
To assist you and better discuss your concern, please do open a new thread by using this link: http://www.jotform.com/contact/. Thank you for your understanding.