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![Common Tasks
MongoDB
{
"_id" : ObjectId("4c03e856e258c2701930c091"),
"title" : "Welcome to MongoDB",
"slug" : "welcome-to-mongodb",
"body" : "Today, we're gonna totally rock your world...",
"published" : true,
"created" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)",
"updated" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)",
"comments" : [
{
"author" : "Bob",
"email" : "bob@example.com",
"body" : "My mind has been totally blown!",
"created" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)"
}
],
"tags" : [
"databases", "MongoDB", "awesome"
]
}](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-12-320.jpg)
![[...frantic hand-wringing ensues...]](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-13-320.jpg)
![[...pause, deep breath...]](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-14-320.jpg)
![Querying
dontTrust = db.people.find({
“age”: { $gt : 30 }
})
awesome = db.posts.find({ “tags” : {
$in : [‘MongoDB’, ‘awesome’]
}})
todo = db.tasks.find({
“status” : { $nin : [
‘In Progress’, ‘Completed‘
]}
})](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-19-320.jpg)
![Grouping results
[
{ 'hits' => 0, 'count' => 5 },
{ 'hits' => 1, 'count' => 4 },
{ 'hits' => 2, 'count' => 7 },
...
]](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-22-320.jpg)
![Map/reduce
> db.items.insert({tags: ['dog', 'cat']})
> db.items.insert({tags: ['dog']})
> db.items.insert({tags: ['dog', 'mouse']})
> db.items.insert({tags: ['dog', 'mouse', 'hippo']})
> db.items.insert({tags: ['dog', 'mouse', 'hippo']})
> db.items.insert({tags: ['dog', 'hippo']})](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-24-320.jpg)
![Map/reduce
> var reduce = function(key, val) {
var count = 0;
for(var i = 0, len = val.length; i < len; i++) {
count += val[i].count;
}
return { count: count };
}](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-26-320.jpg)
![Map/reduce
db["tmp.mr.mapreduce_1273861517_683"].find()
{ "_id" : "cat", "value" : { "count" : 1 } }
{ "_id" : "dog", "value" : { "count" : 6 } }
{ "_id" : "hippo", "value" : { "count" : 3 } }
{ "_id" : "mouse", "value" : { "count" : 3 } }](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-29-320.jpg)
![Atomic Operations
Array operations: $push[All], $pull[All],
$addToSet & $pop:
db.posts.update({ "tags": "MongoDB" }, {
$push: { "tags" : "awesome" }
})
db.posts.update({ "tags": "MySQL" }, {
$pull: { "tags" : "awesome" }
})](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-32-320.jpg)
![Atomic Operations
Array operations: $push[All], $pull[All],
$addToSet & $pop:
db.queues.update(
{ _id : new ObjectId("4c041e...30c093") },
{ $pop: { "operations" : 1 }}
)
db.todos.update(
{ _id : new ObjectId("4c041e...30c093") },
{ $pop: { "listItems" : -1 }}
)](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-33-320.jpg)
![Indexes
When in doubt, explain()
{ "cursor" : "BtreeCursor hits_1 multi",
"indexBounds" : [
[{ "hits" : 0 }, { "hits" : 0 }],
[{ "hits" : 1 }, { "hits" : 1 }]
],
"nscanned" : 1,
"nscannedObjects" : 1,
"n" : 1,
"millis" : 35,
"allPlans" : [
{
"cursor" : "BtreeCursor hits_1 multi",
"indexBounds" : [
[{ "hits" : 0 }, { "hits" : 0 }],
[{ "hits" : 1 }, { "hits" : 1 }]
]
}
]
}](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-37-320.jpg)
![Location
MongoDB makes location-aware apps stupid-simple
First, add an index:
db.places.ensureIndex({ location: “2d” })
Go to town:
db.places.find({
location: { $near : [
40.79870933724115, -73.7656099560547
]}
})](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-39-320.jpg)
![Location
db.places.find({
location: { $within : { $box : {
[
[40.800788494123154,
-73.85556051757814],
[40.68008976560161,
-74.04232809570314]
]
});](https://image.slidesharecdn.com/buildingappswithmongodb-100605230445-phpapp02/85/Building-Apps-with-MongoDB-41-320.jpg)
Uploaded byNate Abele
Building Apps with MongoDB
The document discusses the benefits and functionalities of using MongoDB as an alternative to traditional relational databases. It covers various topics such as querying techniques, atomic operations, indexing, and location-aware app development. Additionally, it highlights integration with frameworks like Drupal and CakePHP, along with community resources and examples for using MongoDB effectively.
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Similar to Building Apps with MongoDB
Building Apps with MongoDB
- 1. Building Apps With NateAbele IPC — 1 June 2010 Berlin
- 3.
- 4. Me Former lead developer,CakePHP Lead developer, Lithium Twitter: @nateabele
- 5. “Alternative” databases? What’s thepoint? Relational databases » relational algebra » set theory ORM “impedance mismatch” Failed alternatives reinforced the status quo
- 6. What’s a documentdatabase? Composed of documents ...duh Each document is heterogenous, and may have a completely unique structure compared to other documents ...That’s pretty much it
- 7. Why Mongo? .org : “The best features of document databases, key-value stores, and relational databases.”
- 8. Mongo is... Fast Smart Scalable
- 9. Terminology Database » Database Table » Collection Row » Document
- 10. Common Tasks tags id MySQL name posts_tags id posts comments post_id id id tag_id title post_id slug author body email published body created created updated
- 11. Common Tasks id posts title slug MongoDB body published created updated comments author email body created tags
- 12. Common Tasks MongoDB { "_id" : ObjectId("4c03e856e258c2701930c091"), "title" : "Welcome to MongoDB", "slug" : "welcome-to-mongodb", "body" : "Today, we're gonna totally rock your world...", "published" : true, "created" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)", "updated" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)", "comments" : [ { "author" : "Bob", "email" : "[email protected]", "body" : "My mind has been totally blown!", "created" : "Mon May 31 2010 12:48:22 GMT-0400 (EDT)" } ], "tags" : [ "databases", "MongoDB", "awesome" ] }
- 13.
- 14.
- 15. Doing the “normaldb” stuff How do I... ...do pattern-matching? db.posts.find({ "title" : /mongodb/i }) ...find all posts tagged ‘MongoDB’? db.posts.find({ "tags" : "MongoDB" }) ...find all Bob’s comments? db.posts.find({ "comments.email" : "[email protected]" })
- 16. Doing the “normaldb” stuff How do I... ...change Bob’s email? db.posts.update( { "comments.email": "[email protected]" }, { $set : { "comments.$.email" : "[email protected]" }} )
- 17.
- 18. Querying $gt $all $gte $size $lt $exists $lte $type $ne $elemMatch $in $not $nin $where $mod
- 19. Querying dontTrust = db.people.find({ “age”: { $gt : 30 } }) awesome = db.posts.find({ “tags” : { $in : [‘MongoDB’, ‘awesome’] }}) todo = db.tasks.find({ “status” : { $nin : [ ‘In Progress’, ‘Completed‘ ]} })
- 20. Querying By arbitrary function: db.posts.find({$where: function() { return this.hits % 2 == 0; }}) By grouping key: db.posts.group({ "key": { "hits": true }, "initial": { count: 0 }, "reduce": function(obj, prev) { prev.count++; } });
- 21. Querying By grouping function: db.photos.group({ keyf: function(o) { return { hits: Math.round(o.hits / 1000) }; }, "initial": { count: 0 }, "reduce": function(obj, prev) { prev.count++; } });
- 22. Grouping results [ { 'hits' => 0, 'count' => 5 }, { 'hits' => 1, 'count' => 4 }, { 'hits' => 2, 'count' => 7 }, ... ]
- 23. Map/reduce ...with apologies toJohn Nunemaker.
- 24. Map/reduce > db.items.insert({tags: ['dog', 'cat']}) > db.items.insert({tags: ['dog']}) > db.items.insert({tags: ['dog', 'mouse']}) > db.items.insert({tags: ['dog', 'mouse', 'hippo']}) > db.items.insert({tags: ['dog', 'mouse', 'hippo']}) > db.items.insert({tags: ['dog', 'hippo']})
- 25. Map/reduce > var map= function() { this.tags.forEach(function(t) { emit(t, {count: 1}); }); }
- 26. Map/reduce > var reduce= function(key, val) { var count = 0; for(var i = 0, len = val.length; i < len; i++) { count += val[i].count; } return { count: count }; }
- 27. Map/reduce > var result= db.items.mapReduce(map, reduce);
- 28. Map/reduce { "ok" : 1, "timeMillis" : 86, "result" : "tmp.mr.mapreduce_1273861517_683", "counts" : { "input" : 6, "emit" : 13, "output" : 4 } }
- 29. Map/reduce db["tmp.mr.mapreduce_1273861517_683"].find() { "_id" : "cat", "value" : { "count" : 1 } } { "_id" : "dog", "value" : { "count" : 6 } } { "_id" : "hippo", "value" : { "count" : 3 } } { "_id" : "mouse", "value" : { "count" : 3 } }
- 30. Atomic Operations Incrementing &decrementing: $inc: db.posts.update( { _id : new ObjectId("4c041e...30c093") }, { $inc : { "hits" : 1 }} ) db.posts.update( { _id : new ObjectId("4c041e...30c093") }, { $inc : { "hits" : -1 }} )
- 31. Atomic Operations Adding, updating& removing: $set & $unset: db.posts.update({}, { $set : { "hits" : 0 }}) db.posts.update({}, { $unset : { "hits" : 1 }})
- 32. Atomic Operations Array operations:$push[All], $pull[All], $addToSet & $pop: db.posts.update({ "tags": "MongoDB" }, { $push: { "tags" : "awesome" } }) db.posts.update({ "tags": "MySQL" }, { $pull: { "tags" : "awesome" } })
- 33. Atomic Operations Array operations:$push[All], $pull[All], $addToSet & $pop: db.queues.update( { _id : new ObjectId("4c041e...30c093") }, { $pop: { "operations" : 1 }} ) db.todos.update( { _id : new ObjectId("4c041e...30c093") }, { $pop: { "listItems" : -1 }} )
- 34. Indexes Slows write performance,but greatly improves reads For best results, index on what you query on Mongo likes to fit its indexes in memory
- 35. Indexes db.users.ensureIndex({ “email”: 1}) db.posts.ensureIndex({ “tags”: 1 }) db.posts.ensureIndex({ “created”: -1 }) db.posts.ensureIndex({ “tags”: 1, “created”: -1 })
- 36. Indexes “unique” / “dropDups”:ensure uniqueness “safe”: Make sure it worked. Else, panic. “name”: Mostly for troubleshooting “background”: Best. Performance. Panic. Button. Ever.
- 37. Indexes When in doubt,explain() { "cursor" : "BtreeCursor hits_1 multi", "indexBounds" : [ [{ "hits" : 0 }, { "hits" : 0 }], [{ "hits" : 1 }, { "hits" : 1 }] ], "nscanned" : 1, "nscannedObjects" : 1, "n" : 1, "millis" : 35, "allPlans" : [ { "cursor" : "BtreeCursor hits_1 multi", "indexBounds" : [ [{ "hits" : 0 }, { "hits" : 0 }], [{ "hits" : 1 }, { "hits" : 1 }] ] } ] }
- 38.
- 39. Location MongoDB makes location-awareapps stupid-simple First, add an index: db.places.ensureIndex({ location: “2d” }) Go to town: db.places.find({ location: { $near : [ 40.79870933724115, -73.7656099560547 ]} })
- 40.
- 41. Location db.places.find({ location: { $within : { $box : { [ [40.800788494123154, -73.85556051757814], [40.68008976560161, -74.04232809570314] ] });
- 42. Easy to getstarted Up and running on most systems in a half-dozen commands or less fewer http://try.mongodb.org/
- 43. Coming to aplatform near you
- 44. Drupal for MongoDB http://drupal.org/project/mongodb D7:mongodb_cache: Store cache items in mongodb D7: mongodb_field_storage: Store the fields in mongodb D7: mongodb_session: Store sessions in mongodb D6/D7: mongodb_watchdog: Store the watchdog messages in mongodb D6/D7: mongodb: support library for the other modules D7: mongodb_block: Store block information in mongodb. Very close to the core block API D7: mongodb_queue: DrupalQueueInterface implementation using mongodb http://sf2010.drupal.org/conference/sessions/mongodb-humongous-drupal
- 45. Even MORE Drupal Workto get listing API into core: http://drupal.org/node/780154 Experimental goodies to play with: http://drupalcode.org/viewvc/drupal/contributions/ sandbox/chx/dbtng_mongo_experimental/
- 46. Joomla! MongoDB helper libraryfor Joomla! Branch of 1.6 development for alternative query builder Full MongoDB support most likely in 2.0
- 47. Lithium PHP framework MongoDBnative support since 0.2 http://rad-dev.org/lithium/wiki Projects demonstrating MongoDB support: http://rad-dev.org/lithium_mongo/source http://rad-dev.org/lithium_blog/source
- 48. CakePHP framework MongoDB datasource http://github.com/ichikaway/mongoDB-Datasource Examplearticle http://mark-story.com/posts/view/using-mongodb- with-cakephp
- 49.
- 50.
- 51.
- 52.
- 53. Thanks! { email: “[email protected]”, twitter: “@nateabele”, web: “http://lithify.me/”, slides: “http://www.slideshare.net/nateabele” }