iPhone Persistence For Mere Mortals

Code and Slides:http://thillerson.googlecode.com

iPhone Persistence For Mere Mortals Tony Hillerson

Software Architect

Tuesday, March 3, 2009


Persistence



... or it means saving stuff.

Persistence



BTW: I’m a n00b

Persistence: Disclaimer



Persistence: Savin’ stuff on ur foneYour options



Settings SQLiteFilesystemThe Internets

Persistence: Options



Persistence: Our Sweet App



Persistence: Sweet Codeshttp://github.com/thillerson/grocery_getter/

Download


http://github.com/thillerson/grocery_getter/

http://github.com/thillerson/grocery_getter/


Persistence: SettingsYours or Apple’s?



Apple’s => Settings.bundle

Persistence: Settings

Yours => Roll your ownBoth end up in NSUserDefaults




Can be one of:NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary



[NSUserDefaults standardUserDefaults];


NSUserDefaults *settings = [NSUserDefaults standardUserDefaults];

[settings setBool:YESforKey:@"shouldSortAfterComplete"];

[NSUserDefaults resetStandardUserDefaults];BOOL on = [settings boolForKey:@"shouldSortAfterComplete"];



Persistence: SQLiteIt’s small, but it’s feisty!



Persistence: SQLite

YO DAWG I HERD YOU LIEK DATA...



Persistence: SQLite

SQLite - Embedded Relational Database written in C



Persistence: SQLite

Embedded Relational Database

written in C



CocoaTouch:Terra Firma

SQLite:Hic Draconae

Sunt



Persistence: SQLite

3 Takes on our Sweet App:• SQLite C API• fmdb + fmdb-migration-

manager• Aptiva’s ActiveRecord



Persistence: SQLite

SQL C API:http://www.sqlite.org/c3ref/funclist.html


http://www.sqlite.org/c3ref/funclist.html





Persistence: SQLite

• fmdb - Thin Wrapper around SQLite• fmdb-migration-manager - Rails-style

migrations using fmdb

• http://code.google.com/p/"ycode/• http://github.com/mocra/fmdb-

migration-manager/


http://code.google.com/p/flycode/

http://code.google.com/p/flycode/

http://github.com/mocra/fmdb-migration-manager/





Persistence: SQLite

• Aptiva’s ActiveRecordIn software engineering, the active record pattern is a design pattern frequently found in software that stores its data in relational databases. It was named by Martin Fowler in his book Patterns of Enterprise Application Architecture.- http://en.wikipedia.org/wiki/Active_record_pattern

http://github.com/aptiva/activerecord/


http://en.wikipedia.org/wiki/Active_record_pattern

http://en.wikipedia.org/wiki/Active_record_pattern






Persistence: SQLite

Quick! To the CODES!



Persistence: A Few PointsTake two, they’re small!



Persistence: Tips

Consider how your settings will be used



Persistence: Tips

A database is an implementation detail



Persistence: Tips

Encapsulation is your friend



Persistence: Tips

Don’t forget to move your database



Persistence: Tips

SQLite write speed is constrained by transactions



Persistence: Tips

SQLite uses duck-typing



Persistence: Tips

FMDB: executeQuery != executeUpdate



Persistence: Tips

RTFS



Persistence: Thank you!

slideshare.com/thillersongithub.com/thillerson twitter.com/thillersonbrightkite.com/thillerson

EffectiveUI.com

Tony HillersonSoftware Architect


http://slideshare.com/thillerson

http://slideshare.com/thillerson

http://github.com/thillerson








iPhone Persistence For Mere Mortals

Technology

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