How can I access my own 2 iOS app database from each other

I am developing 2 iOS app and i want to access their database from each other.

Eg. : APP1 and APP2 both developed by me -APP1 can access APP2 database and vice-versa

I read somewhere that same iOS app developer can have sandbox access authorities to access their own developed iOS app.

If any can help me regarding this than it will be very thank full.

Thank u Advance.