Client storage

Client Side Storage Star wars style  WebSQL and IndexedDB

Long time ago, in a galaxy farfar away …

… days of the old republic … • Cookies – – Limited storage, key value pairs • Local/Session Storage – Store {Key,Value} pairs – Iterate over values – Synchronous, no transactions – Not a database, don‟t fake it

... restoring balance to the force ... • Google Gears:Database module – First release: 2007-05-31 – Database API based on SQLite – built in DB • Web Database API – Dialect of SQLite 3 (ref) – Deprecated (ref)

... WebSql refresher... IndexedDB Example http://yourwebpage.com search Database Database Transactions Transactions Create table bookShop (key varchar(255), value varchar(255)) Insert into bookShop values (“name”, “desc”) Drop table bookShop SQLite Dialect Select * from bookShop where name = „name‟;

... an apprentice to a master ...

... an apprentice to a master ... • Powerful query capabilities • Familiar SQL syntax, easy for developers • Already supported by browsers, no better alternative. “User agents must implement the SQL dialect supported by Sqlite 3.6.19”

... Denying the destiny ...

Come over to the dark side*

… the birth of a hero … • WebSimpleDB – ISAM based store – influenced by Berkley DB – Concepts of ObjectStores, Indexes, Cursors – Most APIs were synchronous – Async models – function callbacks – No SQL

… the force is strong with this one.… • Mozilla, Microsoft Bless youngling – Implemented in Chrome 12, Firefox 4.0, IE10 • Simple implementation for browsers – Basic concepts like transactions – Async and Sync APIs – Libraries to enhance capabilities

... IndexedDB refresher... IndexedDB Example http://yourwebpage.com search Database Database Object Store Object Store key : value Index key : value Index key : value key : value Cursor on Cursor on key : value Index key : value Index Cursor on Cursor on Object Store Object Store

Demo time

… what a piece of junk! … • Specification still evolving – setVersion vs onupgradeneeded – IDBTransaction.READ_ONLY vs “readonly” – Mostly done, now the browsers need to catch up • No SQL • Verbose syntax – requests vs promises

… the alliance … • https://github.com/axemclion/jquery- indexeddb • http://linq2indexeddb.codeplex.com/ • https://github.com/superfeedr/indexeddb- backbonejs-adapter • https://github.com/philikon/queryIndexedD B • http://gazeljs.org/ • http://aaronpowell.github.com/db.js/

… for the rest of us …

... The grand plan …

… The grand plan … - IndexedDB Shim over WebSql - http://nparashuram.com/IndexedDB/polyfill - WebSql shims over Flash, etc. - Or use the libraries

… the alliance …

… the alliance …• Lawnchair• persistence.js• persistJS• amplify.store• localStorageDB• realStorage• YUI3 CacheOffline• dojox.storage• DomSQL• Impel• ActiveJS ActiveRecord• JazzRecord• picnet.data.DataManager• ShinyCar• Lscache• Kizzy• Artemia• microcache.js• Store.js

… always in motion is the future … • Impact of ECMA.Next – IndexedDB module – Promises – Iterators, Generators, Yield support – Save binary blobs – De-structuring assignments [x,y] = [1,2] – Classes as Object Schema

http://nparashuram.com/IndexedDBMay the force be with you @ http://nparashuram.com

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Client storage

by Parashuram Narasimhan

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Client storage

by Parashuram Narasimhan

Accessibility

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6 Embeds 1,163

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Client storage Presentation Transcript

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