I want to know about the following four programming techniques/ statements:
-> How to save / write data from app element to cloud database?
-> How to read data from cloud database and store in app elements?
-> How to delete data from cloud database through app elements?
->How to update data in cloud database through app elements?
I app making a ordering and feedback app both in one app but the ordering area is not working its showing errror that its undefined and not valid this is the zip file please check