This presentation described about strength and weakness of Realm db. I also tried to display my own problems and solutions for that

1. Realm
сильные и слабые стороны
Vladimir Hudnitsky
Rubyroid Labs

2. SQLite

3. SQLite
Сильные
стороны

4. SQLite
Сильные
стороны
Низкоуровнево

5. SQLite
Сильные
стороны
Низкоуровнево
Много контроля

6. SQLite
Сильные
стороны
Низкоуровнево
Много контроля
Слабые стороны
Низкоуровнево!

7. SQLite
Сильные
стороны
Низкоуровнево
Много контроля
Слабые стороны
Низкоуровнево!
Слишком много
контроля

8. SQLite
Сильные
стороны
Низкоуровнево
Много контроля
Слабые стороны
Низкоуровнево!
Слишком много
контроля
Boilerplate

9. Core Data

10. Core Data
Не знаю, многим нравится =)

11. Core Data
Не знаю, многим нравится =)
Хочется проще

12. Magic Records
Parse Realm

13. What
REALM?

14. REALM
Mobile
Database
=

15. REALM
Замена, CoreData &
SQLite

16. REALM
Замена, CoreData &
SQLite
Support: iOS, OSX, Watch OS, Android,
Android Wear

17. REALM
Замена, CoreData &
SQLite
Support: iOS, OSX, Watch OS, Android,
Android Wear
ObjC, Swift, Java, KotlinLang:

18. Why REALM?
Very
Fast
ORM like modes and queries
RealmResults auto refresh
Notifications
Open source
More features…

19. How Fast?

20. How Fast?

21. How Fast?

22. Setup
CoreData
Models
Relation
s
+

23. Setup
CoreData
NSManagedObjectModel *managedObjectModel;
NSPersistentStoreCoordinator *persistentStoreCoordinator;
NSManagedObjectContext *managedObjectContext;
etc…

24. Setup
Realm
@protocol RLMInt;
@interface RRLUserModel : RLMObject
NSNumber <RLMInt> *_id;
NSString *name;
@end
+ (NSString *)primaryKey { return @“_id"; }
…

25. Writes
Create
RLMRealm *realm = [RLMRealm defaultRealm];
User *user = [[User alloc] init];
user.name = @“Jonny Appleseed";
[realm transactionWithBlock:^{
[realm addObject:user];
}];

26. Writes
Create or Update

27. Writes
Create or Update
User *user = [[User alloc] init];
user.name = @“Jonny Appleseed";
[realm transactionWithBlock:^{
[realm addOrUpdateObject:user];
}];

28. Writes
Delete
User *user = …
[realm transactionWithBlock:^{
[realm deleteObject:user];
}];

29. Writes
Bulk Create or Update
NSArray<User *>users = …
[realm transactionWithBlock:^{
[realm addOrUpdateObjectsFromArray:users];
}];

30. Queries
All Objects
RLMResults<User*> *users = [User allObjects]

31. Queries
Filtering
RLMResults<User*> *users =
[User objectsWhere:@“name == ‘Jonny’”]

32. Queries
Complex Filtering
RLMResults<User*> *users =
[User objectsWhere:
@“name == ‘Jonny’
and phone beginwith ‘+375’
and age > 21
and job == nil”
]

33. Queries
Complex Filtering + Sorting
RLMResults<User*> *users =
[[User objectsWhere:
@“name == ‘Jonny’
and phone beginwith ‘+375’
and age > 21
and job == nil”
] sortedResultsUsingProperty:
@"name" ascending:YES]

34. Queries
Auto Updating
RLMResults<User*> *users =
[User objectsWhere:@“name == ‘Jonny’]
users.count; // => 0
[realm transactionWithBlock:^{
[User createInRealm:realm withValue:@{@"name":@"Jonny"}];
}];
users.count; // => 1

35. Realms
RLMRealmConfiguration *config = [RLMRealmConfiguration defaultC
config.path = [[NSBundle mainBundle] pathForResource:@"MyBundl
config.readOnly = YES;
RLMRealm *realm = [RLMRealm realmWithConfiguration:config];

36. Realm Across Threads
RLMRealm *realm = [RLMRealm defaultRealm];

37. Notifications
self.token = [realm addNotificationBlock:^(NSString *not
//just update ui here
[self.tableView reloadTable];
}]

38. Notifications
self.token = [realm addNotificationBlock:^(NSString *not
//just update ui here
[self.tableView reloadTable];
}]
What happens?

39. Notifications
No Ideas =(
What happens?

40. Migrations
check old version number
change data according with version

41. AppGroups

42. AppGroups
NSUserDefaults
Wormhole

43. Restrictions

44. Restrictions
RLMArray<RLMObject> +
RLMArray<NSString> -

45. Restrictions
RLMArray<RLMObject> +
RLMArray<NSString> -
Notifications

46. Restrictions
RLMArray<RLMObject> +
RLMArray<NSString> -
Notifications
NSDate is truncated to the second

47. Restrictions
RLMArray<RLMObject> +
RLMArray<NSString> -
Notifications
NSDate is truncated to the second
Realm Object Setters & Getters cannot be overr

48. Вопросы?
Vladimir
Rubyroid Labs