A refresher on IndexedDB, how the API evolved from its initial versions. Example of LINQ on IndexedDB, IndexedDB-Jquery Plugin and some requirements from IndexedDB

1. IndexedDB Designing the API

2. Long time ago, in a galaxy far far away …

3. Applications Partially Connected Applications Can work offline also Email, Calendar, Source Control ? Offline Applications No connection to the internet required Word processors, todo lists Data Caches Privacy, Save bandwidth, Shopping carts, user preferences

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

5. Transactions : Explicit, auto-commit Two Flavors Async on Main browser thread Sync on Web Workers ... more star wars like text ...

6. Cookies – Limited storage, key value pairs and the cookie monster Local Storage Not a database, don’t fake it … days of the old republic …

7. ... 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) Frozen (ref)

8. … the birth of a hero … WebSimpleDB ISAM based store – influenced by Berkley DB Concepts of Entity Store, Indexes, Cursors Most APIs were synchronous Async models – function callbacks Entity Joins, Sequences and Queues

9. Implemented in Chrome 12, Firefox 4.0, IE10 Uniform Requests API Concrete Asynchronous API Use Structured Cloning Algorithm the dojo http://nparashuram.com/ttd/IndexedDB/index.html … the force is strong with this one.…

10. Microsoft and Mozilla bless the youngling Concept of requests introduced Security concerns addressed Authorization section Privacy Section No more joins, sequences, queues Explicit transactions … young hero shows promise…

11. Come over to the dark side*

12. … encountering the Sith Lord … NoSQL Really ? No, No SQL So what should I do for querying ? You got Cursors, Indexes But complex joins ? NoSQL ? Build something on top, we need least common denominator Fine, here is what I’ve done SHOW ME … Stop talking you will …

13. … what a piece of junk! … Language Integrated Query Language Sounds like english – from table in database, select something when some condition and order by something. Why NoSQL ? Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaghhhh  Just an experiment, how about we team up and write a SQL wrapper on this and see how it looks like? http://nparashuram.com/IndexedDB/LINQ/index.html

14. …the ability to speak doesn't make you intelligent … Syntax looks verbose I no Javascript, can I hazJquery? IndexedDB Wrapper on Javascript Less verbose with use of promises, implicit operations http://nparashuram.com/IndexedDB/jquery/index.html

15. … i find your lack of faith disturbing… Multi Column Indexes – aka Joins Perform union and intersection in JS ? Full Text Search Proposed, but punted to next version DB rollback Versions supported, but no DB version revert Change Tracking and Sync with Server I need to contact my mothership–the USS enterprise

16. … always in motion is the future … No DOM interaction 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

17. May the force be with you http://nparashuram.com/IndexedDB @nparashuram http://nparashuram.com