> I am wondering whether it is possible to create a database in core > data that can be opened by more than one application at the same time. > It is currently impossible to handle one SQLite database with two > instances of the same app. The problem is if user1 quits the app, the > data is saved but user2's instance of the app doesn't recognize this > file system change and just overwrites its version in memory. So the > data from user1 is gone. Is there a way I can handle this? > > Second -- I am having more than two database versions now but still > want to support my version 1.0 but the mapping model only allows one > source model as well as only one target model. I would have to remove > one version but that makes version 1.0 users' database unusable. > > Has anyone gotten something like this to work?
Yes, several Apple frameworks use Core Data databases from multiple processes simultaneously with a single user account and single physical machine. Do you mean "more than one application simultaneously on more than one physical computer over NFS/AFP/SMB" ? Don't do that. Or do you mean an NSDocument based application using Core Data & an SQLite store ? NSDocuments intentionally behave like TextEdit. Last writer wins, overwites everything. If so, you should be using a non-document based Core Data project template. - Ben _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
