What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately, this is not possible to achieve this inside of the form builder.
If you have the programming resource, you can create a custom program using server side programming like PHP to create an interface/connection to pull data from your database to the form fields. You will also need to use the form's full source code then.
If you want to prepopulate fields, via URL parameters, you can achieve it according to the article mentioned on below URL:
You may also use the app to generate a prepopulated form: http://prepopulate.jotform.io
If you need further assistance, feel free to revert back.