1. Who am I?

2. Myles Braithwaite

4. We Develop Websites

5. What is CouchDB?

6. Erlang

7. 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/.

8. Document-Oriented
Database

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

10. <people>
<person first_name=quot;Mylesquot;
last_name=quot;Braithwaitequot;>
<emails>
<email value=quot;me@myles.tkquot;/>
<email value=quot;myles@miys.netquot;/>
</emails>
</person>
</people>

11. [
{
quot;first_namequot;: quot;Mylesquot;,
quot;last_namequot;: quot;Braithwaitequot;,
quot;emailsquot;: [
{ quot;emailquot;: quot;me@myles.tkquot; },
{ quot;emailquot;: quot;myles@miys.netquot; }
]
}
]

12. Relational Database it would require two tables

13. What is RESTful HTTP?

14. Does anyone not know
what HTTP is?

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

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

17. “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school in the same way that Django makes ASP look outdated.”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

18. What is JSON?

19. • JavaScript version of XML.

20. • A less dramatic/lightweight version of XML.

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

22. Distributed

25. Bi-Directional Conflict
Detection and
Resolution

26. Bi-Directional Conflict
Detection and
Resolution

27. Bi-Directional Conflict
Detection and
Resolution

28. Query Documents with
JavaScript

29. Views

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

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

32. 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);
}
};

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

34. Futon

35. Basically the
PHPMyAdmin for
CouchDB

36. Demo Time

37. $ 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}

38. $ 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}

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

40. $ 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}

41. $ 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;}},
...

42. $ 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;}}
]}

43. 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;}

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

45. $ 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;]}

46. $ 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;}}}
...

47. Use Cases

52. 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.

53. 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/