OverWrite all Data in CoreData "Table"

[StefanL]

Hi Folks,

I am fetching master data from a json file and populate my Entities with it. Now I need to update my entities frequently to keep the app on the valid. How can I achieve this? I need to overwrite the whole Entities...

        NSManagedObjectContext *context = [self managedObjectContext];
        
        Stamm *insert = [NSEntityDescription
                            insertNewObjectForEntityForName:@"Stamm" 
                            inManagedObjectContext:context];
        insert.vendor = @"Grazer Verkehrsbetriebe";
        insert.town = @"Graz";
        insert.image  = @"graz_small.png";

This is how I add the data to the Core Data...

Thanks for your help!

BR,

Stefan

[dljeffery]

You would need to individually delete each object; you can't do a single mass deletion like you can with a SQL statement.

If you are going to have a small number of items in your database, perhaps this will be OK. But if you are putting lots of data in there that you will need to refresh frequently, you might find it to be too slow. With a large number of objects that need to be frequently deleted and replaced, it might be better to just use SQLite directly rather than using Core Data (but only if you find Core Data slows things down too much).