How do I store dataentered in the app just on the device and not on appery cloud database?

I would like to have user enter some data in the app and leave it on that specific app instance on the local phone.

I understand that If user uninstalls the app, they lose all the data.

How do I get data from a table for a certain criteria? eg: i created a table that stores userid, grades. one userid can have multiple grades. on login of a specific user, i want to display all the grades of the logged in user. I created a list service for the table and had userid in request paramete...