GTALUG Presentation on CouchDB

Who am I?

Myles Braithwaite

We Develop Websites

What is CouchDB?

Erlang

Apache CouchDB is a distributed, fault-tolerant and schema- free document-oriented database accessible via a RESTful HTTP/JSON API. Among other features, it provides robust, incremental replication with bi-directional conﬂict detection and resolution, and is queryable and indexable using a table- oriented view engine with JavaScript acting as the default view deﬁnition language. Quote from http://couchdb.org/.

Document-Oriented Database

• Each record is store as a document. • Any number of ﬁelds of any length. • Fields can also contain multiple pieces of data.

[ { quot;first_namequot;: quot;Mylesquot;, quot;last_namequot;: quot;Braithwaitequot;, quot;emailsquot;: [ { quot;emailquot;: quot;me@myles.tkquot; }, { quot;emailquot;: quot;myles@miys.netquot; } ] } ]

Relational Database it would require two tables

What is RESTful HTTP?

Does anyone not know what HTTP is?

REST • Representational State Transfer • The foundation of all Web Services • SOAP, • XML-RPC, • and basic HTTP methods like: • POST, GET, PUT, DELETE

RESTful HTTP Methods CRUD POST Create, Update & Delete GET Read PUT Create & Replace DELETE Delete

“Django may be built for the Web, but CouchDB is built of the Web. I’ve never seen software that so completely embraces the philosophies behind HTTP. CouchDB makes Django look old- school in the same way that Django makes ASP look outdated.” — Jacob Kaplan-Moss, Django Developer

What is JSON?

• JavaScript version of XML.

• A less dramatic/lightweight version of XML.

• Google and Yahoo are using it in there Web Services.

Distributed

Bi-Directional Conﬂict Detection and Resolution

Query Documents with JavaScript

• Map Functions • Reduce Functions • Lookup Views -- Demo • Complex Keys -- Demo

Map Functions function(doc) { emit(null, doc); }

Map Functions function(doc) { if (doc.first_name && doc.last_name) { var full_name =Text (doc.first_name + quot; quot; + doc.last_name) emit(full_name, doc); } };

Reduce Functions function (key, values, rereduce) { return sum(values); }

Basically the PHPMyAdmin for CouchDB

Demo Time

$ curl -X PUT -v 'http://127.0.0.1:5984/ temp_database/' > PUT /temp_database/ HTTP/1.1 > User-Agent: curl > Host: 127.0.0.1:5984 > Accept: */* > < HTTP/1.1 201 Created < Server: CouchDB < Date: Tue, 09 Dec 2008 20:32:15 GMT < Content-Type: text/plain;charset=utf-8 < Content-Length: 11 < {quot;okquot;:true}

$ curl -X DELETE -v 'http://127.0.0.1:5984/ temp_database/' > DELETE /temp_database/ HTTP/1.1 > User-Agent: curl > Host: 127.0.0.1:5984 > Accept: */* > < HTTP/1.1 200 OK < Server: CouchDB < Date: Tue, 09 Dec 2008 20:35:26 GMT < Content-Type: text/plain;charset=utf-8 < Content-Length: 11 < {quot;okquot;:true}

$ curl 'http://127.0.0.1:5984/' {quot;couchdbquot;:quot;Welcomequot;,quot;versionquot;:quot;0.8 .1-incubatingquot;}

$ curl 'http://127.0.0.1:5984/ address_book/' {quot;db_namequot;:quot;address_bookquot;,quot;doc_countquot;: 18,quot;doc_del_countquot;:2,quot;update_seqquot;: 117,quot;compact_runningquot;:false,quot;disk_sizequot;: 242905}

$ curl 'http://127.0.0.1:5984/ address_book/_all_docs/' {quot;total_rowsquot;:18,quot;offsetquot;:0,quot;rowsquot;:[ {quot;idquot;:quot;1074d8805eaa79dfec356d34aa719a95quot;, quot;keyquot;:quot;1074d8805eaa79dfec356d34aa719a95quot;, quot;valuequot;:{quot;revquot;:quot;3720758831quot;}}, ...

$ curl 'http://127.0.0.1:5984/ address_book/_all_docs?count=1' {quot;total_rowsquot;:18,quot;offsetquot;:0,quot;rowsquot;:[ {quot;idquot;:quot;1074d8805eaa79dfec356d34aa719a95quot;, quot;keyquot;:quot;1074d8805eaa79dfec356d34aa719a95quot;, quot;valuequot;:{quot;revquot;:quot;3720758831quot;}} ]}

curl 'http://127.0.0.1:5984/address_book/ 1074d8805eaa79dfec356d34aa719a95/' {quot;_idquot;:quot;1074d8805eaa79dfec356d34aa719a95quot; ,quot;_revquot;:quot;3720758831quot;,quot;Fromquot;: {quot;namequot;:quot;Myles Braithwaitequot;,quot;emailquot;:quot;me@mylesbraithwaite .netquot;},quot;Toquot;:quot;tlug@ss.orgquot;,quot;Subjectquot;:quot;Re: [TLUG]: Re: [TLUG-ANNOUNCE]: TLUG Meeting. Tue Sep 9quot;,quot;Datequot;:quot;Wed, 10 Sep 2008 15:28:22 -0400quot;,quot;bodyquot;:quot;...quot;}

$ curl 'http://127.0.0.1:5984/ address_book/ 1074d8805eaa79dfec356d34aa719a95? rev=3720758831'

$ curl 'http://127.0.0.1:5984/ address_book/ 1074d8805eaa79dfec356d34aa719a95? revs=true' {quot;_idquot;:quot;1074d8805eaa79dfec356d34aa719a95quot; ,quot;_revquot;:quot;3720758831quot;, ... quot;_revsquot;: [quot;3720758831quot;,quot;1987563969quot;,quot;3227393092quot;]}

$ curl 'http://127.0.0.1:5984/address_book/_view/ contacts/contact_list/' {quot;total_rowsquot;:5,quot;offsetquot;:0,quot;rowsquot;:[ {quot;idquot;:quot;93a31f6756545d9d59ca53fba6f92fe0quot;,quot;keyquot;:quot;My les Braithwaitequot;,quot;valuequot;: {quot;_idquot;:quot;93a31f6756545d9d59ca53fba6f92fe0quot;,quot;_revquot;:quot; 3685624062quot;,quot;fnquot;:{quot;family- namequot;:quot;Braithwaitequot;,quot;given-namequot;:quot;Mylesquot;},quot;emailquot;: [{quot;valuequot;:quot;me@mylesbraithwaite.netquot;,quot;typequot;:quot;Person alquot;}, {quot;valuequot;:quot;myles@monkeyinyoursoul.comquot;,quot;typequot;:quot;Work quot;}],quot;orgquot;:{quot;organization-namequot;:quot;Monkey in your Soulquot;}}} ...

Use Cases

What CouchDB should not be used for! • A relational database. • A replacement for relational databases. • An object-oriented database. Or more speciﬁcally, meant to function as a seamless persistence layer for an OO programming language.

Pictures • http://flickr.com/photos/ 83737641@N00/2377691249/ • http://flickr.com/photos/ photonquantique/2596581870/ • http://flickr.com/photos/ mbiddulph/2037845171/ • http://flickr.com/photos/ dragon2309/1490657223/ • http://flickr.com/photos/ malcolmtredinnick/202679799/ • http://flickr.com/photos/cgc/ 130309167/ • http://flickr.com/photos/herzogbr/ 359841353/ • http://flickr.com/photos/ andrewmoir/3012531/ • http://www.flickr.com/photos/ daveaustria/2654190796 • http://flickr.com/photos/irisheyes/ 1160297224/ • http://flickr.com/photos/apesara/ 2499666202/ • http://flickr.com/photos/ jessefriedman/1435220149/ • http://flickr.com/photos/ mehrwert/18711050/ • http://flickr.com/photos/tomnatt/ 2763592134/ • http://flickr.com/photos/ bohemianrabbit/2815366720/ • http://flickr.com/photos/ theo_reth/188334429/ • http://flickr.com/photos/ianturton/ 2155423758/

GTALUG Presentation on CouchDB

by Myles Braithwaite

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