Formotus forms do not support ADO data connections directly to a SQL server or other database software because our forms communicate over HTTPS. In order to connect your forms to your database you have two options:
1. Write and expose a SOAP/REST Web service to connect the form to the database. Here are some links to help you learn how to do that:
2. Use SharePoint as an intermediary. For example, use SharePoint's BCS to populate a list with data from the database, then build your form to query the SharePoint list. You can also submit Formotus form data to SharePoint lists.