Connect Sencha 2.x to online database

guys, i have to find a solution to this:

i have to create an app, which brings information from a database...

as i increment rows in the database, my app gets those information, and updates its content.

but when the app is offline, i just maintain the contents that got from the last update...


i'm kinda new in this tecnology, is that possible to do that??? could somebody give me a way to start doing it?

ps.: i know javascript and the mvc structure... just never used with sencha...

thx! :D

try: http://docs.sencha.com/ext-js/4-0/#!/guide/mvc_pt2