Re: CoreData: How to create two separate in-memory stores?
Re: CoreData: How to create two separate in-memory stores?
- Subject: Re: CoreData: How to create two separate in-memory stores?
- From: Frank Illenberger <email@hidden>
- Date: Wed, 27 Jul 2005 18:57:02 +0200
Two points:
1. Using a separate persistent store coordinator is not an option
because I have to be able to get objects from both stores into one
managed object context
2. There is no limitation to the number of stores you can use with
one PSC. I am successfully using three separate SQLite stores on one
PSC. It just does not work with more than one in-memory store.
Am 27.07.2005 um 18:45 schrieb SA Dev:
Someone please correct me if I'm wrong here (I've not tried this
myself), but the way I understand it is that you'd have to create a
separate NSPersistentStoreCoordinator. I *think* this is because
you can only have one store of any given type in the coordinator.
Again, I may be dead wrong.
On Jul 27, 2005, at 12:25 PM, Frank Illenberger wrote:
Sure, I tried the following:
NSPersistentStoreCoordinator *psc = [moc
persistentStoreCoordinator]; id storeA = [psc
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:nil options:nil error:nil];
id storeB = [psc
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:nil options:nil error:nil];
Which produces the "Can't add the same store twice" exception.
And I tried:
id storeA = [psc
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:[NSURL urlWithString:@"storeA"] options:nil error:nil];
id storeB = [psc
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:[NSURL urlWithString:@"storeB"] options:nil error:nil];
Which throws the exception "Can't find table for entity Person in
database at URL storeA" and actually creates two files named
"storeA" and "storeB".
Am 27.07.2005 um 18:21 schrieb SA Dev:
Frank:
It all depends on what you mean by "... try to add a second
store with the same call ...". That's a pretty big question.
Actual code, please? :-)
On Jul 27, 2005, at 11:57 AM, Frank Illenberger wrote:
Hi,
does anybody know if it is possible to use two separate in
memory stores with one persistent store coordinator?
I use the following code to create an in-memory store:
NSPersistentStoreCoordinator *psc = [moc
persistentStoreCoordinator];
id store = [psc
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:nil options:nil error:nil];
This works fine. But if I try to add a second store with the
same call, I get the following exception: "Can't add the same
store twice"
So I thought, the two stores needed separate urls identifying
them. But when I start putting names into the URL like in the
following line
id store = [coordinator
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:[NSURL URLWithString:@"storeA"] options:nil error:nil];
I get the following error: "Can't find table for entity Person
in database at URL storeA"
So how do I create two separate in-memory stores in one PSC?
Cheers
Frank
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