Update data in an app developed in Ionic, when modifying an attribute in a table made in MYSQL

I have developed an app in Ionic 3. I need to know in the same app, when an attribute is modified in a table of a database made in MYSQL.
How can I know from the App if a value was modified in a table of a database in MYSQL?

This is an unusual question, because generally Ionic apps are running on mobile devices, whereas MySQL is generally not running on a mobile device, and ordinarily Ionic apps communicate with REST middleware processes, not with database servers directly. Can you explain your execution environment a bit here?