I've tried to make an alternative method. I'll try to describe it. I would to use a second an auxiliary index where to save my uuid<->objectURI; results are better, so I try to make a summary of the problem and the solution. If anyone have a better idea I'll be happy to talk about it :) I've about 30,000 messages taken from network and I need to save all into a Core Data Store in form of a tree. Each message contains an unique identification string and no more than one message can be saved on database with the same id. CoreData at this time does not support uniqueness of attributes and I can't use objectID property to ensure this kind of thing. A first solution is, in pseudo code: - Execute a query to see if uuid string is presents in storage - If it's not present I can make a new NSManagedObject with that uuid and put it into storage, otherwise I'll ignore it (it's already on db) - Execute another query to find the direct parent of this new message, if found I'll link both messages, if not it's a root message
This solution has a big problem. With 30k messages I need of 30k query to check if the new message exist on coredata, another 30k to check for parent (plus, I think, another 30k to insert the new object). Over 60k+ queries takes lots of time (a minute or more here). My second solution is to create a second auxiliary NSMutableDictionary where i'll save message uuid as key and NSManagedObjectID's URI rapresentation (the only I can save to NSData) as value for dictionary entry. The result in pseudo code is: - Use objectForKey:uuid to my auxiliary dictionary to see if the message exist in coredata - If yes I'll ignore it. If not i'll put it into the store - Use objectForKey:parentuuid to my auxiliary dictionary to see if the parent of the message is present on coredata. If yes i'll use NSPersistentCoordinator's managedObjectIDForURIRepresentation: to get the NSManagedObject (the parent of the message) and link both parent and child With this solution the entire process takes about 5 seconds to finish (the result dictionary it's around 2mb)._______________________________________________ Cocoa-dev mailing list ([email protected]) 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 [email protected]
