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BEYOND CORE DATA: NOSQL FOR MOBILE
Sam Ritchie
APP DATA STORAGEiOS Data Storage
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Core Data SQLite FMDB Magical Record
DATABASESDATABASES
Logical model
Arbitrary queries
Concurrency
Tool support
Existing skills
RELATIONAL
Replication
Full Text indexing
Spatial indexing
Schema upgrades
Object-Relational impedance
Order
Order
Order
Customer
Customer
Customer
Order Line
Order Line
Order Line
Product
Product
Product
Order
Customer
Order Line
Product
Order Line
Product
Order Line
Product
WHAT ARE THE OPTIONS?
The File System
YapDatabase
CloudKit
BENCHMARKS
{ title : …, body : …, createdDate : …, ownerId : “users/1234”, ownerDisplayName : “Sam”, … answers : [ { score : …, body : …, ownerId : “users/4567”, ownerDisplayName : “Jon Skeet”, comments : [] }], comments : [ { score : …, text : …, ownerId : “users/1234”, ownerDisplayName : “Sam” }], tags : [ “objective-c”, “iOS” ], duplicates : [ “questions/456” ], related : [] }
questions/123 users/1234{ displayName : “Sam” reputation : 1337, profileImageURL : …, websiteURL : …, age : …, location : …, creationDate : …, lastAccessDate : … }
Fetch Group By Full Text Search LOC
Core Data Realm CouchBase Lite YapDatabase LevelDB
Awesome
Crap
LEAKY ABSTRACTIONS
COST OF ABSTRACTION
CBLQuery *query = [[self.database viewNamed:@"tags"] createQuery]; query.groupLevel = 1; for (CBLQueryRow *row in [query run:NULL]) NSLog(@"%@ (%@)", row.key, row.value);
Couchbase Lite
__block NSString *currentTag = nil; __block int count = 0; [database enumerateKeysWithPrefix:@"i/tags/" block:^(NSString *key, BOOL *stop) { NSString *tag = [[key stringByDeletingLastPathComponent] stringByReplacingOccurrencesOfString:@"i/tags/" withString:@""]; if (!currentTag || ![currentTag isEqualToString:tag]) { NSLog(@"%@ (%d)", currentTag, count); count = 0; currentTag = tag; } count++; }]; NSLog(@"%@ (%d)", currentTag, count);
LevelDB
COST OF ABSTRACTION
select name, count(1) from Tags group by name
NSFetchRequest* fetch = [NSFetchRequest fetchRequestWithEntityName:@"Tag"]; NSEntityDescription* entity = [NSEntityDescription entityForName:@"Tag" inManagedObjectContext:self.context]; NSAttributeDescription* nameDesc = [entity.attributesByName objectForKey:@"name"]; NSExpression *keyPathExpression = [NSExpression expressionForKeyPath: @"name"]; NSExpression *countExpression = [NSExpression expressionForFunction: @"count:" arguments: [NSArray arrayWithObject:keyPathExpression]]; NSExpressionDescription *expressionDescription = [[NSExpressionDescription alloc] init]; [expressionDescription setName: @"count"]; [expressionDescription setExpression: countExpression]; [expressionDescription setExpressionResultType: NSInteger32AttributeType]; [fetch setPropertiesToFetch:[NSArray arrayWithObjects:nameDesc, expressionDescription, nil]]; [fetch setPropertiesToGroupBy:[NSArray arrayWithObject:nameDesc]]; [fetch setResultType:NSDictionaryResultType]; NSError* error = nil; NSArray *results = [self.context executeFetchRequest:fetch error:&error]; for (NSDictionary *result in results) NSLog(@"%@ (%@)", result[@"name"], result[@"count"]);
Core Data
REPLICATION
Order
Order
Order
Customer
Customer
Customer
Order Line
Order Line
Order Line
Product
Product
Product
Order
Order
Order
Customer
Customer
Customer
Order Line
Order Line
Order Line
Product
Product
Product
Order Line
OrderOrder
Customer
Customer
Product
Order +
Order
Order Line
Order Line
Order
Order Line
Product
Order Line
Product
Order Line
Product
Customer
Order
Customer
Order Line
Product
Order Line
Product
Order Line
ProductProduct
Customer
!
LIVE CODING DEMO
THANKS!
http://codesplice.com.au
@FakeSamRitchie
