A quick introduction to CouchDB and CouchRest done at nwrug.org

1. Intro to CouchDB Ben Aldred http://geekmade.co.uk @benaldred

4. Apache (so it must be good, right?)

5. Document orientated Database

6. CouchDB aims to solve problems

7. Scaling

8. Storing Data

9. How?

10. CouchDB Scales just like rails!

11. Non-locking Multiversion concurrency control (MVCC)

12. Replication

13. New way to model data

14. Case Study: Invoices

15. JSON { "_id":"hello-world", "_rev":"AE19EBC7654", "title":"Hello World", "body":"content...", "date":"2009/12/25 15:52:20" }

16. JSON { "_id":"hello-world", "_rev":"AE19EBC7654", "title":"Hello World", "body":"content...", "date":"2009/12/25 15:52:20" }

17. JSON { "_id":"hello-world", "_rev":"AE19EBC7654", "title":"Hello World", "body":"content...", "date":"2009/12/25 15:52:20" }

18. HTTP REST API Create: PUT /:db Read: GET /:db/:docid Update: PUT /:db/:docid Delete: DELETE /:db/:docid

19. Views

20. Map function(doc) { if(doc.date && doc.title) { emit(doc.date, doc.title); } } key | value ------------------------------------- "2009/12/25 15:52:20" | "Hello World"

21. Query the View http://localhost:5984/mydb/_design/post/_view/foo

22. Query the View http://localhost:5984/mydb/_design/post/_view/foo

23. Demo

24. When to use CouchDB

25. When you need to scale

26. When availibility is more important than consistency

27. When not to use it

28. You want to leaverage the power of an ORM

29. CouchDB + Ruby

30. CouchRest

31. Core couch = CouchRest.new("http://127.0.0.1:5984") db = couch.database!('NWRUG') db.save_doc({ 'title' => 'Intro to CouchDB', 'speaker' => 'Ben Aldred', 'location' => 'BBC', 'tags' => ['couchdb', 'ruby'] })

32. More class Presentation < CouchRest::ExtendedDocument include ::CouchRest::Validation property :title property :speaker property :location validates_present :title end

33. More Presentation.first Presentation.all Presentation.by_title(:key => 'Ben Aldred') Presentation.get('intro_to_couchdb')

34. More property :questions, :cast_as => ['Question'] property :speaker, :cast_as => 'Person' property :started_at, :cast_as => 'Time'

35. More view_by :started_at, :descending => true view_by :speaker, :title

36. More view_by :name, :map => "function(doc) { if(doc.date && doc.title) { emit(doc.date, doc.title); } }"

37. Loads More but I have not got time

39. http://github.com/jchris/couchrest

40. http://couch.io

41. http://labs.mudynamics.com/wp-content/uploads/2009/04/icouch.html

42. http://geekmade.co.uk