Introduction to CouchDB
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CouchDB is a document-oriented database that uses a RESTful HTTP API and JSON format. It allows for schema-free document storage and querying of documents using JavaScript MapReduce functions. Documents are updated using multi-version concurrency control to prevent conflicts during concurrent updates. Replication between CouchDB servers is peer-to-peer, supports conflict detection/resolution, and can be unidirectional, bidirectional, continuous or filtered.
![Create database:
bash$ curl -X PUT http://localhost:5984/contacts
{"ok":true}
bash$ curl -X PUT http://localhost:5984/contacts/1 -d
'{"firstName":"Gheorghe","lastName":"Doja","phones":{"mobile":"004075123321","home":"4500100"}}'
{"ok":true,"id":"1","rev":"1-c7762a779effe1398d8d2ea36ff958a6"}
bash$ curl -X GET http://localhost:5984/contacts/_all_docs
{"total_rows":1,"offset":0,"rows":[
{"id":"1","key":"1","value":{"rev":"1-c7762a779effe1398d8d2ea36ff958a6"}}
]}
Get all documents from a database
bash$ curl -X GET http://localhost:5984/contacts/1
{"_id":"1","_rev":"1-
c7762a779effe1398d8d2ea36ff958a6","firstName":"Gheorghe","lastName":"Doja","phones":{"mobile":"004075123321","home":"064500100
"}}
Get a specific document
bash$ curl -X PUT http://localhost:5984/contacts/1 -d '{"_id":"1","_rev":"1-c7762a779effe1398d8d2ea36ff958a6","firstName":"Gheorgh
e","lastName":"Doja","phones":{"mobile":"004075123000","home":"+4064500100"}}‘
{"ok":true,"id":"1","rev":"2-875f4f380fe5e3eeb5fbaeb495fc3599"}
Updates a document
bash$ curl -X DELETE http://localhost:5984/contacts/1?rev="2-875f4f380fe5e3eeb5fbaeb495fc3599"
{"ok":true,"id":"1","rev":"3-de88253ac3cb9463aac609d5fdfd3135"}
Delete a document
Create a new document:](https://image.slidesharecdn.com/intro-to-couchdb-150527154131-lva1-app6892/85/Introduction-to-CouchDB-19-320.jpg)
Introduction to CouchDB
- 1. Introduction to CouchDB By Bogdan Sabau, SoftVision
- 2. INTRODUCTION
- 3. Databases
- 10. • A scalable, fault-tolerant, and schema-free document-oriented database • A RESTful HTTP/JSON API accessible from many programming libraries and tools • Incremental Map/Reduce queries written in any language (JavaScript support built-in) • Incremental and flexible replication with conflict management
- 12. What does it means? • It means that you don’t need to think to much upfront about what your data will be structured like. You don’t need to think about relations or what might be needed for the future. You just put the data as it currently is into the database and in case it changes, you just change the documents.
- 13. Relational model id firstName lastName 1 Danila Prepeleac 2 Gheorghe Doja customerId phoneTypeId phoneNumber 1 1 004075123321 1 2 064500100 2 1 +4072600300 Customers Phones id Type 1 Mobile 2 Home PhoneTypes
- 15. Document based { "_id":"1", "_rev":"1c7762a779effe1398d8d2ea36ff958a6", "firstName":"Gheorghe", "lastName":"Doja", "phones": { "mobile":"004075123321", "home":"064500100„ } } Key, unique, it can me autogenerated (UUID) or the user can give it
- 16. Document based { "_id":"1", "_rev":"1c7762a779effe1398d8d2ea36ff958a6", "firstName":"Gheorghe", "lastName":"Doja", "phones": { "mobile":"004075123321", "home":"064500100„ } } Key, unique, it can me autogenerated (UUID) or the user can give it Revision number. Yes! It has revisions!
- 17. CRUD OPERATIONS
- 18. CRUD Operations • CouchDB speaks the language of the web: REST, HTTP, and JSON are how CouchDB works natively • Calls are made to the database via HTTP (we can use anything that talks HTTP) • Responses come back as JSON
- 19. Create database: bash$ curl -X PUT http://localhost:5984/contacts {"ok":true} bash$ curl -X PUT http://localhost:5984/contacts/1 -d '{"firstName":"Gheorghe","lastName":"Doja","phones":{"mobile":"004075123321","home":"4500100"}}' {"ok":true,"id":"1","rev":"1-c7762a779effe1398d8d2ea36ff958a6"} bash$ curl -X GET http://localhost:5984/contacts/_all_docs {"total_rows":1,"offset":0,"rows":[ {"id":"1","key":"1","value":{"rev":"1-c7762a779effe1398d8d2ea36ff958a6"}} ]} Get all documents from a database bash$ curl -X GET http://localhost:5984/contacts/1 {"_id":"1","_rev":"1- c7762a779effe1398d8d2ea36ff958a6","firstName":"Gheorghe","lastName":"Doja","phones":{"mobile":"004075123321","home":"064500100 "}} Get a specific document bash$ curl -X PUT http://localhost:5984/contacts/1 -d '{"_id":"1","_rev":"1-c7762a779effe1398d8d2ea36ff958a6","firstName":"Gheorgh e","lastName":"Doja","phones":{"mobile":"004075123000","home":"+4064500100"}}‘ {"ok":true,"id":"1","rev":"2-875f4f380fe5e3eeb5fbaeb495fc3599"} Updates a document bash$ curl -X DELETE http://localhost:5984/contacts/1?rev="2-875f4f380fe5e3eeb5fbaeb495fc3599" {"ok":true,"id":"1","rev":"3-de88253ac3cb9463aac609d5fdfd3135"} Delete a document Create a new document:
- 20. Updating documents • Highly concurent • It can serve a high number of parallel requests. • MVCC (Multiversion concurrency control)
- 21. Updating a document _rev: 1 CouchDB
- 22. Updating a document _rev: 1 CouchDB _rev: 1_rev: 1 DerpDerpina
- 23. Updating a document _rev: 1 CouchDB _rev: 1_rev: 1 DerpDerpina
- 24. Updating a document _rev: 1 CouchDB _rev: 1_rev: 1 DerpDerpina
- 25. Updating a document _rev: 2 CouchDB _rev: 1 Derpina
- 26. Updating a document _rev: 2 CouchDB _rev: 1 Derpina
- 27. Updating a document _rev: 2 CouchDB _rev: 1 Derpina
- 28. Updating a document _rev: 2 CouchDB _rev: 1 Derpina
- 29. Updating a document _rev: 2 CouchDB _rev: 1 Derpina _rev: 2 Derpina
- 30. Updating a document _rev: 2 CouchDB _rev: 2 Derpina
- 31. Updating a document _rev: 2 CouchDB _rev: 2 Derpina
- 32. Updating a document _rev: 3 CouchDB
- 36. Views • Are stored as an accessible web resource on disk and incrementally updated as well as replicated with the database • Each view defines a map function, and can define a reduce function
- 37. One simple view function(doc) { if (doc.ocupation == "domnitor") { emit(doc.ocupation, doc.firstName + ' ' + doc.lastName); } } input output key value
- 38. { _id: "534ce91c445da85f636284856c000c77", _rev: "1-36d8948a4dc06aad20dfc9a95ad12de1", firstName: "Bogdan", lastName: "Sabau", ocupation: "sportiv" } { _id: "534ce91c445da85f636284856c001087", _rev: "2-eb737c5882c8e7e351a4f19678eeb9f7", firstName: "Gheorghe", lastName: "Doja", ocupation: "nobil" } { _id: "534ce91c445da85f636284856c001c49", _rev: "1-35972e6ee7c7ab828d4110c3dbc3a4de", firstName: "Iacob", lastName: "Heraclide", ocupation: "domnitor" } { _id: "534ce91c445da85f636284856c001eb2", _rev: "1-91c5e4f0cc0836b5f4d0e4bcf3d66467", firstName: "Alexandru", lastName: "Lapusneanu", ocupation: "domnitor" } { _id: "534ce91c445da85f636284856c002529", _rev: "1-a58e090b6138abf648eb65cbcd077ed7", firstName: "Constantin", lastName: "Karadja", ocupation: "diplomat" }
- 39. Output in Futon
- 40. Reduce function
- 41. Reduce function
- 42. REPLICATION
- 43. Replication • Peer to peer • Online/Offline • Conflict detection and resolution • Any number of nodes
- 44. Unidirectional
- 45. Bidirectional
- 46. Continuous 8
- 48. QUESTIONS?