Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Possible duplicate <a href="https://stackoverflow.com/questions/13109257/is-it-possible-to-have-multiple-core-data-databases-on-one-ios-app">here</a>.</p> <p>You can have any number of data models, provided you create different managed object contexts for each and manage them properly.</p> <pre><code>- (NSURL *)applicationDocumentsDirectoryForCoreData { return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; } </code></pre> <p>//first data model</p> <pre><code>NSURL *modelURL1 = [[NSBundle mainBundle] URLForResource:@"1_model" withExtension:@"momd"]; NSURL *storeURL1 = [[self applicationDocumentsDirectoryForCoreData] URLByAppendingPathComponent:@"1_model.sqlite"]; NSError *error = nil; NSManagedObjectModel *managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL1]; persistentStoreCoordinator1 = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: managedObjectModel]; if (![persistentStoreCoordinator1 addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL1 options:nil error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } </code></pre> <p>//second model.</p> <pre><code> NSURL *modelURL2 = [[NSBundle mainBundle] URLForResource:@"2_model" withExtension:@"momd"]; NSURL *storeURL2 = [[self applicationDocumentsDirectoryForCoreData] URLByAppendingPathComponent:@"2_model.sqlite"]; managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL2]; NSError *error = nil; persistentStoreCoordinator2 = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel]; if (![persistentStoreCoordinator2 addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL2 options:nil error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } </code></pre> <p>And while taking out the MOC for the store you want:</p> <pre><code>//select your store - do that in selectStore or a function like that. NSPersistentStoreCoordinator *coordinator = [self selectStore]; if (coordinator != nil) { managedObjectContext = [[NSManagedObjectContext alloc] init]; [managedObjectContext setPersistentStoreCoordinator:coordinator]; } </code></pre> <p>Selection between two stores.</p> <pre><code>-(NSPersistentStoreCoordinator *)selectStore { if(someCondtion? return persistentStoreCoordinator1: persistentStoreCoordinator2; } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POis it possilbe to have mutliple core data model files to one single xcode project?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USsatheeshwaran
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POis it possilbe to have mutliple core data model files to one single xcode project?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COi am talking about multiple .xcdatamodel file.. is it possible. if yes then how to add that?
      singulars
      1. PO
      1. USHarshit Gupta
    2. COYes it is possible, .xcdatamodel file means a core data sqlite db. So you can have multiple .xcdatamodel files.
      singulars
      1. PO
      1. USsatheeshwaran
    3. COdid you get my point? please upvote to carry on discussion atleast.
      singulars
      1. PO
      1. USHarshit Gupta
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload