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Intro to CouchDBBen Aldredhttp://geekmade.co.uk@benaldred
DisclaimerI am not a CouchDB expert
I still quite like Relational DatabasesIntroducing...
Apache(so it must be good, right?)
Document orientated Database
CouchDB aims to solve problems
Scaling
Storing Data
How?
CouchDB Scalesjust like rails!
Non-locking Multiversion concurrency control (MVCC)
Replication
New way to model data
Case Study: Invoices
JSON{       "_id":"hello-world",    "_rev":"AE19EBC7654",    "title":"Hello World",    "body":"content...",    "date":"2009/12/25 15:52:20" }
JSON{   "_id":"hello-world",    "_rev":"AE19EBC7654",    "title":"Hello World",    "body":"content...",    "date":"2009/12/25 15:52:20" }
JSON{       "_id":"hello-world","_rev":"AE19EBC7654",    "title":"Hello World",    "body":"content...",    "date":"2009/12/25 15:52:20" }
HTTP REST APICreate:    PUT            /:db Read:      GET            /:db/:docidUpdate:   PUT            /:db/:docidDelete:    DELETE     /:db/:docid
Views
Mapfunction(doc) {    if(doc.date && doc.title) {        emit(doc.date, doc.title);       }} key                  |  value-------------------------------------"2009/12/25 15:52:20"  | "Hello World"
Query the Viewhttp://localhost:5984/mydb/_design/post/_view/foo
Query the Viewhttp://localhost:5984/mydb/_design/post/_view/foo
Demo
When to use CouchDB
When you need to scale
When availibility is more important than consistency
When not to use it
You want to leaverage the power of an ORM
CouchDB + Ruby
CouchRest
Corecouch = 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']})
Moreclass Presentation < CouchRest::ExtendedDocument  include ::CouchRest::Validation  property :title  property :speaker  property :location  validates_present :titleend
MorePresentation.firstPresentation.allPresentation.by_title(:key => 'Ben Aldred')Presentation.get('intro_to_couchdb')
Moreproperty :questions, :cast_as => ['Question']property :speaker, :cast_as => 'Person'property :started_at, :cast_as => 'Time'
Moreview_by :started_at, :descending => trueview_by :speaker, :title
Moreview_by :name,  :map =>     "function(doc) {      if(doc.date && doc.title) {        emit(doc.date, doc.title);      }    }"
Loads Morebut I have not got time
Resourceshttp://books.couchdb.org/relax/

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Intro to CouchDB