MongoDB - Javascript for your Data

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MongoDB - Javascript for your Data

  1. 1. javascript for your datajavascript for your data
  2. 2. MongoDB Bridge the gap between key/val stores and traditional RDBMS
  3. 3. MongoDB Bridge the gap between key/val stores and traditional RDBMS
  4. 4. MongoDB the gap ● table
  5. 5. MongoDB the gap ● table → collection
  6. 6. MongoDB collection
  7. 7. MongoDB collection ● BSON document
  8. 8. MongoDB collection ● BSON document ● a set of fields
  9. 9. MongoDB collection ● BSON document ● a set of fields – key-value pair
  10. 10. MongoDB collection ● BSON document ● a set of fields – key-value pair ● key: a name (string)
  11. 11. MongoDB collection ● BSON document ● a set of fields – key-value pair ● key: a name (string) ● val: any basic type – string, int, float, date, binary, array, document, ...
  12. 12. MongoDB collection ● of BSON documents ● queryable
  13. 13. MongoDB the gap ● table → collection ● SQL
  14. 14. MongoDB the gap ● table → collection ● SQL → query objects
  15. 15. MongoDB Query object
  16. 16. MongoDB Query object ● JSON-like query representation
  17. 17. MongoDB Query object ● JSON-like query representation ● db.users.find({ 'lastname': 'Heckmann' });
  18. 18. MongoDB Query object { 'lastname': 'Heckmann' }
  19. 19. MongoDB Query object { 'lastname': 'Heckmann' } could even be an array
  20. 20. MongoDB Query object { 'lastname': 'Heckmann' , 'body.odor': 'nasty' , 'age': { $gt: 32 } , ... }
  21. 21. MongoDB Query object { 'lastname': 'Heckmann' , 'body.odor': 'nasty' , 'age': { $gt: 32 } , ... }
  22. 22. MongoDB Query object { 'lastname': 'Heckmann' , 'body.odor': 'nasty' , 'age': { $gt: 32 } , ... }
  23. 23. MongoDB Query object { 'lastname': 'Heckmann' , 'body.odor': 'nasty' , 'age': { $gt: 32, $lt: 65 } , ... }
  24. 24. MongoDB Query object $gt $lt $ne $in $nin $all $not $size $exists … more
  25. 25. MongoDB Query object RegExp too!
  26. 26. MongoDB Query object RegExp too db.users.find({ 'lastname': /eckmann$/i });
  27. 27. MongoDB Query object Subsets db.users.find({ 'lastname': /eckmann$/i }, { 'age': true });
  28. 28. MongoDB Query object db.users .find({ 'lastname': /eckmann$/i }) .sort({ 'lastname': -1 }) .limit(10) .skip(10*(pageNumber - 1)) ;
  29. 29. MongoDB Query object db.users .find({ 'lastname': /eckmann$/i }) .sort({ 'lastname': -1 }) ← descending .limit(10) .skip(10*(pageNumber - 1)) ;
  30. 30. MongoDB Query object db.users .find({ 'lastname': /eckmann$/i }) .count() ;
  31. 31. MongoDB ● no JOINs
  32. 32. MongoDB ● no JOINs ● less normalization
  33. 33. MongoDB ● no JOINs ● less normalization ● embedded documents
  34. 34. MongoDB embedded documents
  35. 35. MongoDB embedded documents { name: 'aaron' , scores: [ { total: 93, class: ObjectID } , { total: 46, class: ObjectID } , { total: 20, class: ObjectID } ] }
  36. 36. MongoDB embedded documents { name: 'aaron' , scores: [ { total: 93, class: ObjectID } , { total: 46, class: ObjectID } , { total: 20, class: ObjectID } ] } think foreign keys
  37. 37. MongoDB embedded documents { name: 'aaron' , scores: [ { total: 93, class: ObjectID } , { total: 46, class: ObjectID } , { total: 20, class: ObjectID } ] } { _id: ObjectID , name: 'how to be a good neighbor' , teacher: 'mr rogers' }
  38. 38. MongoDB ObjectID ● unique identifier of a document ● each document has one ● auto inserted if missing
  39. 39. MongoDB Insertion and UpdationInsertion and Updation
  40. 40. MongoDB
  41. 41. cheesy
  42. 42. Atomic OperationsAtomic Operations
  43. 43. MongoDB $set $unset $inc $push $pushAll $pop $pull $pullAll $addToSet $rename Atomic Ops
  44. 44. MongoDB IndexingIndexing
  45. 45. MongoDB Indexing ● any property ● into embedded documents ● into arrays
  46. 46. MongoDB Indexing db.users.ensureIndex({ lastname: 1 }) db.users.ensureIndex({ 'body.odor': 1 }) db.users.ensureIndex({ 'body.odor': 1, age: 1 })
  47. 47. MongoDB HTTP InterfaceHTTP Interface
  48. 48. MongoDB HTTP Interface ● http://localhost:28017/ ● http://localhost:28017/database/collection/?limit=5 ● http://localhost:28017/database/collection/?filter_key=value
  49. 49. MongoDB ● Document oriented ● Schema-less ● Rich queries ● Full index support ● Atomic operations ● MapReduce ● Auto-sharding / replication / GridFS
  50. 50. MongoDB Mongoose ● https://github.com/learnboost/mongoose/tree/1.0
  51. 51. Thank You http://www.mongodb.org https://github.com/mongodb https://github.com/learnboost/mongoose https://github.com/christkv/node-mongodb-native http://www.mongodb.org/display/DOCS/Production+Deployments https://github.com/aheckmann http://twitter.com/#!/aaronheckmann

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