Use data instead of json
Throw the exception upwards
Throw the exception upwards
Delete method
Update method
Helper method for updating method
Merge branch 'master' of github.com:cs2103aug2014-w10-3j/main into db/sean
Yet another layer to throw up to
Throw all exceptions up
The read will return the information from the main database, namely the first
Throwing exceptions
Make it a singleton class
Merge remote-tracking branch 'origin/db/sean' into logic/wenhao