A lot of users will say to use
https://www.b4x.com/android/forum/t...ation-of-rdc-remote-database-connector.61801/
But as all my MySQL apps are for internal business use only (no play store apps), I personally use the MySQL connection libraries from
@DonManfred. there's no messing about and they just work straight out in 5 minutes flat, no uploading of anything, no messing about with server files etc and all my clients are more than happy with my solutions.