Connect your Gravity Forms directly to your WPDB-Database-Table. This is a plugin for professionals and developers.

Demo
https://codecanyon.net/item/gravity-forms-wpdb-mysql-connect/5968479

Download
https://www.filecad.com/e4qh/Gravity-Forms-%E2%80%93-WPDB--MySQL-Connect-v3.5.1.rar