1. CouchDB relax
Kota Sakoda
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2. • cohtan ( Kota Sakoda )
•
•
•
•
• codecheck.in
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3. Agenda
• DB CouchDB
•
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4. What’s CouchDB?
• Erlang DB
• Not Relational!
• RESTful API
• SQL MapReduce
• N-Master Replication
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5. Erlang
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6. Erlang
•
•
• 0.9.0 11067 !
($ cat src/couchdb/*.erl | wc)
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7. Document Oriented
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8. Document Oriented
• RDB
•1 JSON
• JSON
•
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9. {
“_id”: “ABCDEFG”,
“_rev”: “1-AB123C”,
“type”: “person”,
“name”: “Kota Sakoda”,
“age”: 29,
“computer”:
[”MacBook Air”, “MacBook”, “Inspiron
Mini 12”],
}
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10. {
“_id”: “ABCDEFG”,
“_rev”: “2-AB123C”,
“type”: “person”,
“name”: “Kota Sakoda”,
“age”: 29,
“computer”:
[”MacBook Air”, “MacBook”, “Inspiron
Mini 12”, “SC430”],
“hobby”:{“program”:[”perl”,”erlang”]}
}
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11. RESTful API
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12. RESTful API
• Crete
HTTP PUT /dbname/docid
• Read
HTTP GET /dbname/docid
• Update
HTTP PUT /dbname/docid
• Delete
HTTP DELETE /dbname/docid
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13. RESTful API
•
http://wiki.apache.org/couchdb/Basics
• Amazon EC2, ExtJS, C, C#, Erlang, Futon,
Haskell, Java, JavaScript, LISP, LotusScript,
Objective-C, Perl, PHP, Python, Ruby,
Smalltalk
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14. MapReduce Framework
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15. MapReduce Framework
• JavaScript MapReduce!
• Map JSON
KeyValue
• Reduce KeyValue
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16. {
“_id”:“ABCDEFG”,
“_rev”:“1-A1B2C3”,
“tag”:“perl couchdb cpan”,
“title”:”AnyEvent::CouchDB”,
“href”:”http://search.cpan.org/
~beppu/AnyEvent-CouchDB/”
}
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17. // Map Function
function(doc) {
if(doc.tag.match(/couchdb/i){
emit(doc.title, doc.href);
}
}
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18. Result
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19. // Map Function
function(doc) {
var tags = doc.tag.split(“ “);
for(var i in tags) {
emit(tags[i], 1);
}
}
// Reduce Function
function(keys, values) {
return sum(values);
}
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20. Result
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21. N-Master Replication
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22. $ curl -X POST --data
'{”source”:”http://remote:5984/
somedb”,”target”:”somedb”}'
http://localhost:5984/_replicate
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23. Replication Complete
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24. !!!
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25. 2009 6 1

26. N-Master Replication
• Master - Slave
•
• source, target
• ※
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27. Demo
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28. Demo
• cohtan Delicious
CouchDB
•
All Document, Design Document, Temporary View, created view
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29. CouchApp
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30. CouchApp
• CouchDB Design Document
/
Python Framework
• Python
• HTML JavaScript
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31. Sofa
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32. Sofa
• CouchApp
• CouchDB
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33. Demo
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34. Demo
• Sofa Demo
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35. • Web Application Fit
• RESTful JSON
•
•
• Scaffold
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36. : http://delicious/com/cohtan/couchdb
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