On Jun 21, 2008, at 3:33 AM, René v Amerongen wrote:
Does someone has any experience about having a local data store
which is syncing wit the server store using Coredata?
We have a few 300+ laptop users and 50+ desktop users who are
working in the same database.
Now I have to make a similar database but then that the Laptop users
can work offline.
I would like to have them sync their local copy with the server when
they are online again.
Is this possible with Coredata and SQL? Does someone has suggestions
in this directions?
Core Data doesn't do this out of the box. What you can do is create a
server back-end that the front-end applications synchronize with.
You'll have to implement both the server and the synchronization logic
yourself, but two-way/multi-way synchronization are themselves
actually well-traveled computer science problems.
Data Synchronization
http://en.wikipedia.org/wiki/Data_Synchronization
Category: Data Synchronization
http://en.wikipedia.org/wiki/Category:Data_synchronization
You'll need to ensure that each entity whose instances you want to
synchronize has an additional "sync ID" property that is set to a UUID
or something equivalent, and implement one of the standard sync
algorithms. Communication with a back-end server that implements a
REST-style protocol using Cocoa is very simple as well.
The advantage of doing this is that you can still get all of the
benefits of Core Data for work on local systems, and just treat the
local Core Data persistent store as a cache for the user's interaction
with the server. (In other words, it makes offline/disconnected use
of the application feasible.)
Of course you still have to write code to do this, but at least you
don't have to switch the application that runs on end-user systems
completely away from Core Data to use hand-generated SQL.
-- Chris
PS - As always, if there are capabilities you'd like to see in Core
Data or elsewhere in Cocoa, please file a feature/enhancement request
at <http://bugreport.apple.com/>. Feature and enhancement requests
are particularly useful if you describe a bit about why you'd like
what you're suggesting -- what you'd do with it, what your business
case or user base is ("300+ laptop users and 50+ desktop users"), and
so on.
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