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2014/10/15 下午 10:08:35

iphone Programming Glossary: executefetchrequest

How do i avoid running out of memory when performing a task on every item of core data?

http://stackoverflow.com/questions/12448545/how-do-i-avoid-running-out-of-memory-when-performing-a-task-on-every-item-of-cor

@ version @ @ 1.0 request setPredicate predicate NSArray results AppDelegate applicationDelegate .managedObjectContext executeFetchRequest request error nil int i 0 while i results.count Entry entry results objectAtIndex i entry.version @ 1.1 i But it runs..

Core Data: Quickest way to delete all instances of an entity

http://stackoverflow.com/questions/1383598/core-data-quickest-way-to-delete-all-instances-of-an-entity

myContext allCars setIncludesPropertyValues NO only fetch the managedObjectID NSError error nil NSArray cars myContext executeFetchRequest allCars error error allCars release error handling goes here for NSManagedObject car in cars myContext deleteObject car..

Does CoreData on iPhone support IN predicates?

http://stackoverflow.com/questions/1436032/does-coredata-on-iphone-support-in-predicates

predicateWithFormat @ type in @ shipTypes fetchRequest setPredicate aPredicate theRecords self.managedObjectContext executeFetchRequest fetchRequest error error 安hen run the executeFetchRequest message throws an exception p Terminating app due to uncaught.. setPredicate aPredicate theRecords self.managedObjectContext executeFetchRequest fetchRequest error error 安hen run the executeFetchRequest message throws an exception p Terminating app due to uncaught exception 'NSInvalidArgumentException' reason 'unimplemented.. modifier NSDirectPredicateModifier type NSInPredicateOperatorType options 0 theRecords self.managedObjectContext executeFetchRequest fetchRequest error error Not that this would have caught this particular error at compile time but it WOULD have potentially..

Core Data unique attributes [closed]

http://stackoverflow.com/questions/2239797/core-data-unique-attributes

request.predicate NSPredicate predicateWithFormat @ objectId @ uniqueUserId NSError executeFetchError nil user context executeFetchRequest request error executeFetchError lastObject if executeFetchError NSLog @ @ @ error looking up user with id i with error @..

UITableView Core Data reordering

http://stackoverflow.com/questions/2360938/uitableview-core-data-reordering

sortDescriptors release sortDescriptor release NSError error NSMutableArray mutableFetchResults managedObjectContext executeFetchRequest request error error mutableCopy if mutableFetchResults nil Handle the error. request release return mutableFetchResults..

Retrieving a unique result set with Core Data

http://stackoverflow.com/questions/2656227/retrieving-a-unique-result-set-with-core-data

sortDescriptors sortDescriptors release rankDescriptor release NSArray fetchResults managedObjectContext executeFetchRequest fetchRequest error error fetchRequest release return fetchResults Right now that is crashing with the following Invalid..

How to fetch distinct values in Core Data?

http://stackoverflow.com/questions/2785844/how-to-fetch-distinct-values-in-core-data

fetch NSError error id requestedValue nil WTF This isn't defined or used anywhere NSArray objects managedObjectContext executeFetchRequest request error error if objects nil handle the error This is great and seems perfect for what I need...but how does one actually.. NSArray arrayWithObject @ name Execute the fetch NSError error NSArray objects managedObjectContext executeFetchRequest request error error if objects nil abort for NSDictionary obj in objects NSLog @ Person @ obj objectForKey @ name ... So..

Core data, how to get NSManagedObject's ObjectId when NSFetchRequest returns NSDictionaryResultType?

http://stackoverflow.com/questions/3956406/core-data-how-to-get-nsmanagedobjects-objectid-when-nsfetchrequest-returns-nsd

NSArray arrayWithObjects objectIdDesc anotherPropertyDesc yetAnotherPropertyDesc nil NSArray fetchResults myContext executeFetchRequest myFetchRequest error fetchError You should then have a @ objectID key in the the dictionaries you get back from your fetch..

Coredata Error “data: <fault>”

http://stackoverflow.com/questions/7304257/coredata-error-data-fault

request.predicate NSPredicate predicateWithFormat @ latitude 0 AND longitude 0 NSError error NSLog @ @ self.context executeFetchRequest request error error NSLog @ @ error localizedDescription CoreData should have 9 matching objects and it finds the 9 objects...

Crash when adding persistent store (iCloud enabled) in app delegate

http://stackoverflow.com/questions/8021753/crash-when-adding-persistent-store-icloud-enabled-in-app-delegate

entityForName @ Vehicle inManagedObjectContext moc request setEntity entity NSError error nil NSArray vehicles moc executeFetchRequest request error error for NSManagedObject object in vehicles NSManagedObject newObject NSEntityDescription insertNewObjectForEntityForName..

why is “error:&error” used here (objective-c)

http://stackoverflow.com/questions/8334518/why-is-errorerror-used-here-objective-c

error error&rdquo used here objective c why is error error used here objective c NSError error nil NSArray array moc executeFetchRequest request error error wouldn't an object in objective c be effectively pass by reference anyway iphone objective c ios pass.. to return a different object from the one you passed in. To be clear the method could look something like this NSArray executeFetchRequest Request request error NSError error ... if error NULL some_error_condition error SomeNSErrorSubclass alloc init... autorelease.. the calling code to ignore errors by simply passing in NULL for the error parameter as follows NSArray array moc executeFetchRequest request error NULL Update in response to questions There are two reasons why the argument type has to be NSError instead..

Storing messages using XMPPFramework for ios?

http://stackoverflow.com/questions/8568910/storing-messages-using-xmppframework-for-ios

request NSFetchRequest alloc init request setEntity entityDescription NSError error NSArray messages moc executeFetchRequest request error error self print NSMutableArray alloc initWithArray messages void print NSMutableArray messages @autoreleasepool..

Core Data's NSPrivateQueueConcurrencyType and sharing objects between threads

http://stackoverflow.com/questions/8637921/core-datas-nsprivatequeueconcurrencytype-and-sharing-objects-between-threads

it still the case with performBlock Is the following context performBlock ^ fetch request code NSArray results context executeFetchRequest request error nil dispatch_async dispatch_get_main_queue ^ void Class firstObject results objectAtIndex 0 do something with.. autorelease Now this can safely be called from ANY thread backgroundMOC performBlock ^ NSArray results backgroundMOC executeFetchRequest request error nil for NSManagedObject mo in results NSManagedObjectID moid mo objectID mainMOC performBlock ^ NSManagedObject..