If I understand correctly, you want to access a MYSQL database in the WEB directly from a mobile device.
This is not a good idea since MYSQL has no port protection. Access to port 3306 is unprotected!
This can be done via SSL and tunneling the port 3306, or via HTTPS access to a PHP script, which does the necessary queries to the MYSQL database.
In normal GUI development, I use DEVART's SecureBridge components for this. However, this also requires a specially set up server that serves these tunnels.
A difficult topic :-)