SlideShare a Scribd company logo

MongoDB + Java - Everything you need to know

Download as PPTX, PDF
Norberto Leite, profile picture
Norberto Leite

The document provides comprehensive information on using MongoDB with Java, including announcements about driver releases with new features. It outlines the process for connecting to MongoDB, performing CRUD operations (Create, Read, Update, Delete), handling write concerns, and executing bulk writes. Additionally, it discusses read preferences and filtering data within the database using MongoDB's Java driver.

Technology
1 of 78
Downloaded 239 times
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
MongoDB + Java - Everything you need to know
MongoDB + Java Everything you need to know
Agenda • MongoDB + Java • Driver • ODM's • JVM Languages • Hadoop
Ola, I'm Norberto! Norberto Leite Technical Evangelist Madrid, Spain @nleite norberto@mongodb.com http://www.mongodb.com/norberto
A few announcements…
Announcements
Announcements • Java 3.0.0-beta2 available for testing – Generic MongoCollection – New Codec infrastructure – Asynchronous Support – New core driver • Better support for JVM languages – https://github.com/mongodb/mongo-java- driver/releases/tag/r3.0.0-beta2 • RX Streams – testing only! – https://github.com/rozza/mongo-java-driver- reactivestreams
http://www.humanandnatural.com/data/media/178/badan_jaran_desert_oasis_china.jpg Let's go and test this! http://www.tinypm.com/blog/wp-content/uploads/2015/01/hammer.jpg
Java Driver
Getting Started • Review our documentation – http://docs.mongodb.org/ecosystem/drivers/java/
Connecting http://std3.ru/d3/09/1379154681-d309dacac47a71fb92480157f1d9a0ea.jpg
Connecting public void connect() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //connect to host MongoClient mongoClient = new MongoClient(host); … }
Connecting public void connect() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //connect to host MongoClient mongoClient = new MongoClient(host); … } Client Instance Host Machine
Connecting public void connectServerAddress() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //using ServerAddress ServerAddress serverAddress = new ServerAddress(host); //connect to host MongoClient mongoClient = new MongoClient(serverAddress); … }
Connecting public void connectServerAddress() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //using ServerAddress ServerAddress serverAddress = new ServerAddress(host); //connect to host MongoClient mongoClient = new MongoClient(serverAddress); … } Server Address Instance
Connecting public boolean connectReplicas() throws UnknownHostException{ //replica set members String []hosts = { "mongodb://localhost:30000", "mongodb://localhost:30001", "mongodb://localhost:30000", }; //list of ServerAdress List<ServerAddress> seeds = new ArrayList<ServerAddress>(); for (String h: hosts){ seeds.add(new ServerAddress(h)); } //connect to host MongoClient mongoClient = new MongoClient(seeds); … }
Connecting public boolean connectReplicas() throws UnknownHostException{ //replica set members String []hosts = { "mongodb://localhost:30000", "mongodb://localhost:30001", "mongodb://localhost:30000", }; //list of ServerAdress List<ServerAddress> seeds = new ArrayList<ServerAddress>(); for (String h: hosts){ seeds.add(new ServerAddress(h)); } //connect to host MongoClient mongoClient = new MongoClient(seeds); … } Seed List
Database & Collections public void connectDatabase(final String dbname, final String collname){ //database instance DB database = mongoClient.getDB(dbname); //collection instance DBCollection collection = database.getCollection(collname); https://api.mongodb.org/java/current/com/mongodb/DB.html https://api.mongodb.org/java/current/com/mongodb/DBCollection.html
Security public void connectServerAddress() throws UnknownHostException{ String host = "localhost:27017"; ServerAddress serverAddress = new ServerAddress(host); String dbname = "test"; String userName = "norberto"; char[] password = {'a', 'b', 'c'}; MongoCredential credential = MongoCredential .createMongoCRCredential(userName, dbname, password); MongoClient mongoClient = new MongoClient(serverAddress, Arrays.asList(credential)); http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-java- driver/#authentication-optional
Writing http://std3.ru/d3/09/1379154681-d309dacac47a71fb92480157f1d9a0ea.jpg
Inserting public boolean insertObject(SimplePojo p){ //lets insert on database `test` String dbname = "test"; //on collection `simple` String collname = "simple"; DBCollection collection = mc.getDB(dbname).getCollection(collname); DBObject document = new BasicDBObject(); document.put("name", p.getName()); document.put("age", p.getAge()); document.put("address", p.getAddress()); //db.simple.insert( { "name": XYZ, "age": 45, "address": "49 Rue de Rivoli, 75001 Paris"}) collection.insert(document);… }
Inserting public boolean insertObject(SimplePojo p){ //lets insert on database `test` String dbname = "test"; //on collection `simple` String collname = "simple"; DBCollection collection = mc.getDB(dbname).getCollection(collname); DBObject document = new BasicDBObject(); document.put("name", p.getName()); document.put("age", p.getAge()); document.put("address", p.getAddress()); //db.simple.insert( { "name": XYZ, "age": 45, "address": "49 Rue de Rivoli, 75001 Paris"}) collection.insert(document); … } Collection instance BSON wrapper
Inserting public boolean insertObject(SimplePojo p){ … WriteResult result = collection.insert(document); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); … } https://api.mongodb.org/java/current/com/mongodb/DBObject.html https://api.mongodb.org/java/current/com/mongodb/WriteResult.html
Update public long savePojo(SimplePojo p) { DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); //method replaces the existing database document by this new one WriteResult res = this.collection.save(document); //if it does not exist will create one (upsert) return res.getN(); }
Update public long savePojo(SimplePojo p) { DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); //method replaces the existing database document by this new one WriteResult res = this.collection.save(document); //if it does not exist creates one (upsert) return res.getN(); } Save method
Update public long updateAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); DBObject update = BasicDBObjectBuilder.start().add("name", p.getName()).add("age", p.getAge()).add("address", address).get(); return this.collection.update(query, update).getN(); }
Update public long updateAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); DBObject update = BasicDBObjectBuilder.start().add("name", p.getName()).add("age", p.getAge()).add("address", address).get(); return this.collection.update(query, update).getN(); } Query Object Update Object
Update public long updateSetAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); //db.simple.update( {"name": XYZ}, {"$set":{ "address": ...} } ) DBObject update = BasicDBObjectBuilder.start() .append("$set", new BasicDBObject("address", address) ).get(); return this.collection.update(query, update).getN(); }
Update public long updateSetAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); //db.simple.update( {"name": XYZ}, {"$set":{ "address": ...} } ) DBObject update = BasicDBObjectBuilder.start() .append("$set", new BasicDBObject("address", address) ).get(); return this.collection.update(query, update).getN(); } Using $set operator http://docs.mongodb.org/manual/reference/operator/update/
Remove public long removePojo( SimplePojo p){ //query object to match documents to be removed DBObject query = BasicDBObjectBuilder.start().add("name", p.getName()).get(); return this.collection.remove(query).getN(); }
Remove public long removePojo( SimplePojo p){ //query object to match documents to be removed DBObject query = BasicDBObjectBuilder.start() .add("name", p.getName()).get(); return this.collection.remove(query).getN(); } Matching query
Remove All public long removeAll( ){ //empty object removes all documents > db.simple.remove({}) return this.collection.remove(new BasicDBObject()).getN(); } Empty document http://docs.mongodb.org/manual/reference/method/db.collection.remove/
WriteConcern http://std3.ru/d3/09/1379154681-d309dacac47a71fb92480157f1d9a0ea.jpghttp://www.theworldeffect.com/images/6a00e54fa8abf78833011570eedcf1970b-800wi.jpg
WriteConcern //Default WriteConcern w1 = WriteConcern.ACKNOWLEDGED; WriteConcern w0 = WriteConcern.UNACKNOWLEDGED; WriteConcern j1 = WriteConcern.JOURNALED; WriteConcern wx = WriteConcern.REPLICA_ACKNOWLEDGED; WriteConcern majority = WriteConcern.MAJORITY; https://api.mongodb.org/java/current/com/mongodb/WriteConcern.html
WriteConcern.ACKNOWLEDGED
WriteConcern.UNACKNOWLEDGED
WriteConcern.JOURNALED
WriteConcern.REPLICA_ACKNOWLEDGED
WriteConcern public boolean insertObjectWriteConcern(SimplePojo p){ … WriteResult result = collection.insert(document, WriteConcern.REPLICA_ACKNOWLEDGED); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); //log the last write concern used log.info( "Last write concern used "+ result.getLastConcern() );… }
WriteConcern public boolean insertObjectWriteConcern(SimplePojo p){ … WriteResult result = collection.insert(document, WriteConcern.REPLICA_ACKNOWLEDGED); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); //log the last write concern used log.info( "Last write concern used "+ result.getLastConcern() ); … } Confirm on Replicas
WriteConcern public void setWriteConcernLevels(WriteConcern wc){ //connection level this.mc.setWriteConcern(wc); //database level this.mc.getDB("test").setWriteConcern(wc); //collection level this.mc.getDB("test").getCollection("simple").setWriteConcern(wc); //instruction level this.mc.getDB("test").getCollection("simple").insert( new BasicDBObject() , wc); }
Bulk Write http://images.fineartamerica.com/images-medium-large/2-my-old-bucket-curt-simpson.jpg
Write Bulk public boolean bulkInsert(List<SimplePojo> ps){ … //initialize a bulk write operation BulkWriteOperation bulkOp = coll.initializeUnorderedBulkOperation(); for (SimplePojo p : ps){ DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); bulkOp.insert(document); } //call the set of inserts bulkOp.execute(); … }
Inserting Bulk public void writeSeveral( SimplePojo p, ComplexPojo c){ //initialize ordered bulk BulkWriteOperation bulk = this.collection.initializeOrderedBulkOperation(); DBObject q1 = BasicDBObjectBuilder.start() .add("name", p.getName()).get(); //remove the previous document bulk.find(q1).removeOne(); //insert the new document bulk.insert( c.encodeDBObject() ); BulkWriteResult result = bulk.execute(); //do something with the result result.getClass(); }
Reading http://std3.ru/d3/09/1379154681-d309dacac47a71fb92480157f1d9a0ea.jpghttp://1.bp.blogspot.com/_uYSlZ_2-VwI/SK0TrNUBVBI/AAAAAAAAASs/5334Tlv0IIY/s1600-h/lady_reading_book.jpg
Read public SimplePojo get(){ //basic findOne operation DBObject doc = this.collection.findOne(); SimplePojo pojo = new SimplePojo(); //casting to destination type pojo.setAddress((String) doc.get("address")); pojo.setAge( (int) doc.get("age") ); pojo.setAddress( (String) doc.get("address") ); return pojo; }
Read public List<SimplePojo> getSeveral(){ List<SimplePojo> pojos = new ArrayList<SimplePojo>(); //returns a cursor DBCursor cursor = this.collection.find(); //iterates over the cursor for (DBObject document : cursor){ //calls factory or transformation method pojos.add( this.transform(document) ); } return pojos; }
Read public List<SimplePojo> getSeveral(){ List<SimplePojo> pojos = new ArrayList<SimplePojo>(); //returns a cursor DBCursor cursor = this.collection.find(); //iterates over the cursor for (DBObject document : cursor){ //calls factory or transformation method pojos.add( this.transform(document) ); } return pojos; } Returns Cursor
Read public List<SimplePojo> getAtAge(int age) { List<SimplePojo> pojos = new ArrayList<SimplePojo>(); DBObject criteria = new BasicDBObject("age", age); // matching operator { "age": age} DBCursor cursor = this.collection.find(criteria); // iterates over the cursor for (DBObject document : cursor) { // calls factory or transformation method pojos.add(this.transform(document)); } return pojos; } Matching operator
Read public List<SimplePojo> getOlderThan( int minAge){ … DBObject criteria = new BasicDBObject( "$gt", new BasicDBObject("age", minAge)); // matching operator { "$gt": { "age": minAge} } DBCursor cursor = this.collection.find(criteria); … }
Read public List<SimplePojo> getOlderThan( int minAge){ … DBObject criteria = new BasicDBObject( "$gt", new BasicDBObject("age", minAge)); // matching operator { "$gt": { "age": minAge} } DBCursor cursor = this.collection.find(criteria); … } Range operator http://docs.mongodb.org/manual/reference/operator/query/
Read & Filtering public String getAddress(final String name) { DBObject criteria = new BasicDBObject("name", name); //we want the address field DBObject fields = new BasicDBObject( "address", 1 ); //and exclude _id too fields.put("_id", 0); // db.simple.find( { "name": name}, {"_id:0", "address":1} ) DBObject document = this.collection.findOne(criteria, fields); //we can check if this is a partial document document.isPartialObject(); return (String) document.get("address"); }
Read & Filtering public String getAddress(final String name) { DBObject criteria = new BasicDBObject("name", name); //we want the address field DBObject fields = new BasicDBObject( "address", 1 ); //and exclude _id too fields.put("_id", 0); // db.simple.find( { "name": name}, {"_id:0", "address":1} ) DBObject document = this.collection.findOne(criteria, fields); //we can check if this is a partial document document.isPartialObject(); return (String) document.get("address"); } Select fields
Read Preference http://2.bp.blogspot.com/-CW3UtTpWoqg/UHhJ0gzjxcI/AAAAAAAAQz0/l_ozSnrwkvo/s1600/Grigori+Semenovich+Sedov+-+Choosing+the+bride+of+Czar+Alexis.jpg
Read Preference //default ReadPreference.primary(); ReadPreference.primaryPreferred(); ReadPreference.secondary(); ReadPreference.secondaryPreferred(); ReadPreference.nearest(); https://api.mongodb.org/java/current/com/mongodb/ReadPreference.html
Read Preference – Tag Aware //read from specific tag DBObject tag = new BasicDBObject( "datacenter", "Porto" ); ReadPreference readPref = ReadPreference.secondary(tag); http://docs.mongodb.org/manual/tutorial/configure-replica-set-tag-sets/
Read Preference public String getName( final int age ){ DBObject criteria = new BasicDBObject("age", age); DBObject fields = new BasicDBObject( "name", 1 ); //set to read from nearest node DBObject document = this.collection.findOne(criteria, fields, ReadPreference.nearest() ); //return the element return (String) document.get("name"); } Read Preference
Aggregation // create our pipeline operations, first with the $match DBObject match = new BasicDBObject("$match", new BasicDBObject("type", "airfare")); // build the $projection operation DBObject fields = new BasicDBObject("department", 1); fields.put("amount", 1); fields.put("_id", 0); DBObject project = new BasicDBObject("$project", fields ); // Now the $group operation DBObject groupFields = new BasicDBObject( "_id", "$department"); groupFields.put("average", new BasicDBObject( "$avg", "$amount")); DBObject group = new BasicDBObject("$group", groupFields); …
Aggregation // Finally the $sort operation DBObject sort = new BasicDBObject("$sort", new BasicDBObject("amount", -1)); // run aggregation List<DBObject> pipeline = Arrays.asList(match, project, group, sort); AggregationOutput output = coll.aggregate(pipeline);
Java ODM's
Morphia
Morphia
Morphia public class Employee { // auto-generated, if not set (see ObjectId) @Id ObjectId id; // value types are automatically persisted String firstName, lastName; // only non-null values are stored Long salary = null; // by default fields are @Embedded Address address; … }
Morphia public class Employee { … //references can be saved without automatic loading Key<Employee> manager; //refs are stored**, and loaded automatically @Reference List<Employee> underlings = new ArrayList<Employee>(); // stored in one binary field @Serialized EncryptedReviews encryptedReviews; //fields can be renamed @Property("started") Date startDate; @Property("left") Date endDate; … }
SpringData
Spring Data http://projects.spring.io/spring-data-mongodb/
Jongo
Jongo http://jongo.org/
Others • DataNucleus JPA/JDO • lib-mongomapper • Kundera • Hibernate OGM
JVM Languages
Scala • http://docs.mongodb.org/ecosystem/drivers/scala/ • Cashbah – Java Driver Wrapper – Idiomatic Scala Interface for MongoDB • Community – Hammersmith – Salat – Reactive Mongo – Lift Web Framework – BlueEyes – MSSD
Clojure http://clojuremongodb.info/
Groovy https://github.com/poiati/gmongo
Hadoop
MongoDB Hadoop Connector • MongoDB and BSON – Input and Output formats • Computes splits to read data • Support for – Filtering data with MongoDB queries – Authentication (and separate for configdb) – Reading from shard Primary directly – ReadPreferences and Replica Set tags (via MongoDB URI) – Appending to existing collections (MapReduce, Pig, Spark)
For More Information Resource Location Case Studies mongodb.com/customers Presentations mongodb.com/presentations Free Online Training education.mongodb.com Webinars and Events mongodb.com/events Documentation docs.mongodb.org MongoDB Downloads mongodb.com/download Additional Info info@mongodb.com
http://cl.jroo.me/z3/v/D/C/e/a.baa-Too-many-bicycles-on-the-van.jpg Questions? @nleite norberto@mongodb.com http://www.mongodb.com/norberto
MongoDB + Java - Everything you need to know

More Related Content

PDF
Java development with MongoDB
James Williams
 
PPTX
Morphia: Simplifying Persistence for Java and MongoDB
Jeff Yemin
 
PDF
Java Persistence Frameworks for MongoDB
MongoDB
 
PPTX
Java Development with MongoDB
Scott Hernandez
 
PPTX
MongoDB + Java + Spring Data
Anton Sulzhenko
 
PPTX
Simplifying Persistence for Java and MongoDB with Morphia
MongoDB
 
PPTX
MongoDB: Easy Java Persistence with Morphia
Scott Hernandez
 
PPTX
Java Persistence Frameworks for MongoDB
Tobias Trelle
 
Java development with MongoDB
James Williams
 
Morphia: Simplifying Persistence for Java and MongoDB
Jeff Yemin
 
Java Persistence Frameworks for MongoDB
MongoDB
 
Java Development with MongoDB
Scott Hernandez
 
MongoDB + Java + Spring Data
Anton Sulzhenko
 
Simplifying Persistence for Java and MongoDB with Morphia
MongoDB
 
MongoDB: Easy Java Persistence with Morphia
Scott Hernandez
 
Java Persistence Frameworks for MongoDB
Tobias Trelle
 

What's hot (18)

PPTX
Morphia, Spring Data & Co.
Tobias Trelle
 
PDF
Webinar: MongoDB Persistence with Java and Morphia
MongoDB
 
PDF
MongoDB Performance Tuning
Puneet Behl
 
PDF
Webinar: Building Your First App with MongoDB and Java
MongoDB
 
PPTX
Spring Data, Jongo & Co.
Tobias Trelle
 
PPTX
Getting Started with MongoDB and NodeJS
MongoDB
 
PPTX
Back to Basics Webinar 5: Introduction to the Aggregation Framework
MongoDB
 
PPS
MongoDB crud
Darshan Jayarama
 
PPTX
Benefits of Using MongoDB Over RDBMS (At An Evening with MongoDB Minneapolis ...
MongoDB
 
PDF
MongoDB World 2016: Deciphering .explain() Output
MongoDB
 
PDF
Map/Confused? A practical approach to Map/Reduce with MongoDB
Uwe Printz
 
PPTX
Mythbusting: Understanding How We Measure the Performance of MongoDB
MongoDB
 
PDF
What do you mean, Backwards Compatibility?
Trisha Gee
 
PDF
NoSQL and JavaScript: a Love Story
Alexandre Morgaut
 
ODP
DrupalCon Chicago Practical MongoDB and Drupal
Doug Green
 
PDF
Indexing and Query Optimizer (Mongo Austin)
MongoDB
 
PDF
Building Apps with MongoDB
Nate Abele
 
PDF
MongoDB Performance Tuning
MongoDB
 
Morphia, Spring Data & Co.
Tobias Trelle
 
Webinar: MongoDB Persistence with Java and Morphia
MongoDB
 
MongoDB Performance Tuning
Puneet Behl
 
Webinar: Building Your First App with MongoDB and Java
MongoDB
 
Spring Data, Jongo & Co.
Tobias Trelle
 
Getting Started with MongoDB and NodeJS
MongoDB
 
Back to Basics Webinar 5: Introduction to the Aggregation Framework
MongoDB
 
MongoDB crud
Darshan Jayarama
 
Benefits of Using MongoDB Over RDBMS (At An Evening with MongoDB Minneapolis ...
MongoDB
 
MongoDB World 2016: Deciphering .explain() Output
MongoDB
 
Map/Confused? A practical approach to Map/Reduce with MongoDB
Uwe Printz
 
Mythbusting: Understanding How We Measure the Performance of MongoDB
MongoDB
 
What do you mean, Backwards Compatibility?
Trisha Gee
 
NoSQL and JavaScript: a Love Story
Alexandre Morgaut
 
DrupalCon Chicago Practical MongoDB and Drupal
Doug Green
 
Indexing and Query Optimizer (Mongo Austin)
MongoDB
 
Building Apps with MongoDB
Nate Abele
 
MongoDB Performance Tuning
MongoDB
 
Ad

Viewers also liked (17)

PPTX
Building Spring Data with MongoDB
MongoDB
 
PPT
WebEngage demo at Unpluggd (Nov, 2011)
Avlesh Singh
 
KEY
The Spring Data MongoDB Project
MongoDB
 
PDF
PHP client - Mongo db User Group Pune
Nishant Shrivastava
 
PDF
Spring Data MongoDB 介紹
Kuo-Chun Su
 
PDF
MongoDB training for java software engineers
Moshe Kaplan
 
PDF
Build an AngularJS, Java, MongoDB Web App in an hour
Trisha Gee
 
PDF
Mongo DB on the JVM - Brendan McAdams
JAX London
 
PPTX
Mongo DB
Tata Consultancy Services
 
PDF
Migrating from RDBMS to MongoDB
MongoDB
 
PDF
AngularJS performance & production tips
Nir Kaufman
 
PPSX
Génie Logiciel : les tests
Mohammed Amine Mostefai
 
PDF
How to monitor MongoDB
Server Density
 
PPTX
The Aggregation Framework
MongoDB
 
PDF
ng-owasp: OWASP Top 10 for AngularJS Applications
Kevin Hakanson
 
PDF
Tests & recette - Les fondamentaux
COMPETENSIS
 
ODP
Présentation Agile Testing
jubehr
 
Building Spring Data with MongoDB
MongoDB
 
WebEngage demo at Unpluggd (Nov, 2011)
Avlesh Singh
 
The Spring Data MongoDB Project
MongoDB
 
PHP client - Mongo db User Group Pune
Nishant Shrivastava
 
Spring Data MongoDB 介紹
Kuo-Chun Su
 
MongoDB training for java software engineers
Moshe Kaplan
 
Build an AngularJS, Java, MongoDB Web App in an hour
Trisha Gee
 
Mongo DB on the JVM - Brendan McAdams
JAX London
 
Mongo DB
Tata Consultancy Services
 
Migrating from RDBMS to MongoDB
MongoDB
 
AngularJS performance & production tips
Nir Kaufman
 
Génie Logiciel : les tests
Mohammed Amine Mostefai
 
How to monitor MongoDB
Server Density
 
The Aggregation Framework
MongoDB
 
ng-owasp: OWASP Top 10 for AngularJS Applications
Kevin Hakanson
 
Tests & recette - Les fondamentaux
COMPETENSIS
 
Présentation Agile Testing
jubehr
 
Ad

Similar to MongoDB + Java - Everything you need to know (20)

PPTX
Dev Jumpstart: Build Your First App with MongoDB
MongoDB
 
KEY
CouchDB on Android
Sven Haiges
 
PDF
How to Write Node.js Module
Fred Chien
 
PPTX
Conceptos básicos. Seminario web 2: Su primera aplicación MongoDB
MongoDB
 
PPT
Micro-ORM Introduction - Don't overcomplicate
Kiev ALT.NET
 
PDF
Utilizing Powerful Extensions for Analytics and Operations
Neo4j
 
PDF
Neo4j GraphTour: Utilizing Powerful Extensions for Analytics and Operations
Mark Needham
 
KEY
[Coscup 2012] JavascriptMVC
Alive Kuo
 
PPT
Play!ng with scala
Siarzh Miadzvedzeu
 
PDF
GraphTour - Utilizing Powerful Extensions for Analytics & Operations
Neo4j
 
PDF
Projeto-web-services-Spring-Boot-JPA.pdf
AdrianoSantos888423
 
PPTX
Full stack development with node and NoSQL - All Things Open - October 2017
Matthew Groves
 
PPTX
Full Stack Development with Node.js and NoSQL
All Things Open
 
ODP
This upload requires better support for ODP format
Forest Mars
 
PDF
CouchDB Mobile - From Couch to 5K in 1 Hour
Peter Friese
 
PPTX
Back to Basics, webinar 2: La tua prima applicazione MongoDB
MongoDB
 
PPTX
Webinar: What's new in the .NET Driver
MongoDB
 
PDF
Utilizing Powerful Extensions for Analytics and Operations
Neo4j
 
PDF
My way to clean android - Android day salamanca edition
Christian Panadero
 
PPT
nodejs tutorial foor free download from academia
rani marri
 
Dev Jumpstart: Build Your First App with MongoDB
MongoDB
 
CouchDB on Android
Sven Haiges
 
How to Write Node.js Module
Fred Chien
 
Conceptos básicos. Seminario web 2: Su primera aplicación MongoDB
MongoDB
 
Micro-ORM Introduction - Don't overcomplicate
Kiev ALT.NET
 
Utilizing Powerful Extensions for Analytics and Operations
Neo4j
 
Neo4j GraphTour: Utilizing Powerful Extensions for Analytics and Operations
Mark Needham
 
[Coscup 2012] JavascriptMVC
Alive Kuo
 
Play!ng with scala
Siarzh Miadzvedzeu
 
GraphTour - Utilizing Powerful Extensions for Analytics & Operations
Neo4j
 
Projeto-web-services-Spring-Boot-JPA.pdf
AdrianoSantos888423
 
Full stack development with node and NoSQL - All Things Open - October 2017
Matthew Groves
 
Full Stack Development with Node.js and NoSQL
All Things Open
 
This upload requires better support for ODP format
Forest Mars
 
CouchDB Mobile - From Couch to 5K in 1 Hour
Peter Friese
 
Back to Basics, webinar 2: La tua prima applicazione MongoDB
MongoDB
 
Webinar: What's new in the .NET Driver
MongoDB
 
Utilizing Powerful Extensions for Analytics and Operations
Neo4j
 
My way to clean android - Android day salamanca edition
Christian Panadero
 
nodejs tutorial foor free download from academia
rani marri
 

More from Norberto Leite (20)

PDF
Data Modelling for MongoDB - MongoDB.local Tel Aviv
Norberto Leite
 
PPTX
Avoid Query Pitfalls
Norberto Leite
 
PPTX
MongoDB and Spark
Norberto Leite
 
PDF
Mongo db 3.4 Overview
Norberto Leite
 
PDF
MongoDB Certification Study Group - May 2016
Norberto Leite
 
PDF
Geospatial and MongoDB
Norberto Leite
 
PDF
MongodB Internals
Norberto Leite
 
PDF
MongoDB WiredTiger Internals
Norberto Leite
 
PDF
MongoDB 3.2 Feature Preview
Norberto Leite
 
PDF
Mongodb Spring
Norberto Leite
 
PDF
MongoDB on Azure
Norberto Leite
 
PDF
MongoDB: Agile Combustion Engine
Norberto Leite
 
PDF
MongoDB Capacity Planning
Norberto Leite
 
PDF
Spark and MongoDB
Norberto Leite
 
PDF
Analyse Yourself
Norberto Leite
 
PDF
Python and MongoDB
Norberto Leite
 
PDF
Strongly Typed Languages and Flexible Schemas
Norberto Leite
 
PDF
Effectively Deploying MongoDB on AEM
Norberto Leite
 
PPTX
Advanced applications with MongoDB
Norberto Leite
 
PDF
MongoDB and Node.js
Norberto Leite
 
Data Modelling for MongoDB - MongoDB.local Tel Aviv
Norberto Leite
 
Avoid Query Pitfalls
Norberto Leite
 
MongoDB and Spark
Norberto Leite
 
Mongo db 3.4 Overview
Norberto Leite
 
MongoDB Certification Study Group - May 2016
Norberto Leite
 
Geospatial and MongoDB
Norberto Leite
 
MongodB Internals
Norberto Leite
 
MongoDB WiredTiger Internals
Norberto Leite
 
MongoDB 3.2 Feature Preview
Norberto Leite
 
Mongodb Spring
Norberto Leite
 
MongoDB on Azure
Norberto Leite
 
MongoDB: Agile Combustion Engine
Norberto Leite
 
MongoDB Capacity Planning
Norberto Leite
 
Spark and MongoDB
Norberto Leite
 
Analyse Yourself
Norberto Leite
 
Python and MongoDB
Norberto Leite
 
Strongly Typed Languages and Flexible Schemas
Norberto Leite
 
Effectively Deploying MongoDB on AEM
Norberto Leite
 
Advanced applications with MongoDB
Norberto Leite
 
MongoDB and Node.js
Norberto Leite
 

Recently uploaded (20)

PPTX
Machine Learning_overview_presentation.pptx
kondavamsidharreddy2
 
PPTX
Programs and apps: productivity, graphics, security and other tools
4mqw9zch22
 
PDF
A comparative analysis of optical character recognition models for extracting...
IAESIJAI
 
PPTX
Digital-Transformation-Roadmap-for-Companies.pptx
David Malick Dieng
 
PDF
Spectral efficient network and resource selection model in 5G networks
IAESIJAI
 
PDF
The Rise and Fall of 3GPP – Time for a Sabbatical?
3G4G
 
PPT
Teaching material agriculture food technology
LiaRayya
 
PDF
TokAI - TikTok AI Agent : The First AI Application That Analyzes 10,000+ Vira...
SOFTTECHHUB
 
PDF
Profit Center Accounting in SAP S/4HANA, S4F28 Col11
Libreria ERP
 
PDF
Network Security Unit 5.pdf for BCA BBA.
Serpent6
 
PDF
Getting Started with Data Integration: FME Form 101
Safe Software
 
PDF
Encapsulation theory and applications.pdf
gurumoop
 
PDF
cuic standard and advanced reporting.pdf
SimoneTitaniumTomase
 
PPTX
SOPHOS-XG Firewall Administrator PPT.pptx
AgnesMunisi
 
PDF
Blue Purple Modern Animated Computer Science Presentation.pdf.pdf
Akar16
 
PDF
Per capita expenditure prediction using model stacking based on satellite ima...
IAESIJAI
 
PDF
Video forgery: An extensive analysis of inter-and intra-frame manipulation al...
IAESIJAI
 
PPTX
Group 1 Presentation -Planning and Decision Making .pptx
MatthewLewis227954
 
PPTX
MYSQL Presentation for SQL database connectivity
Swati270511
 
PDF
Diabetes mellitus diagnosis method based random forest with bat algorithm
IAESIJAI
 
Machine Learning_overview_presentation.pptx
kondavamsidharreddy2
 
Programs and apps: productivity, graphics, security and other tools
4mqw9zch22
 
A comparative analysis of optical character recognition models for extracting...
IAESIJAI
 
Digital-Transformation-Roadmap-for-Companies.pptx
David Malick Dieng
 
Spectral efficient network and resource selection model in 5G networks
IAESIJAI
 
The Rise and Fall of 3GPP – Time for a Sabbatical?
3G4G
 
Teaching material agriculture food technology
LiaRayya
 
TokAI - TikTok AI Agent : The First AI Application That Analyzes 10,000+ Vira...
SOFTTECHHUB
 
Profit Center Accounting in SAP S/4HANA, S4F28 Col11
Libreria ERP
 
Network Security Unit 5.pdf for BCA BBA.
Serpent6
 
Getting Started with Data Integration: FME Form 101
Safe Software
 
Encapsulation theory and applications.pdf
gurumoop
 
cuic standard and advanced reporting.pdf
SimoneTitaniumTomase
 
SOPHOS-XG Firewall Administrator PPT.pptx
AgnesMunisi
 
Blue Purple Modern Animated Computer Science Presentation.pdf.pdf
Akar16
 
Per capita expenditure prediction using model stacking based on satellite ima...
IAESIJAI
 
Video forgery: An extensive analysis of inter-and intra-frame manipulation al...
IAESIJAI
 
Group 1 Presentation -Planning and Decision Making .pptx
MatthewLewis227954
 
MYSQL Presentation for SQL database connectivity
Swati270511
 
Diabetes mellitus diagnosis method based random forest with bat algorithm
IAESIJAI
 

MongoDB + Java - Everything you need to know

  • 2. MongoDB + Java Everything you need to know
  • 3. Agenda • MongoDB + Java • Driver • ODM's • JVM Languages • Hadoop
  • 4. Ola, I'm Norberto! Norberto Leite Technical Evangelist Madrid, Spain @nleite [email protected] http://www.mongodb.com/norberto
  • 7. Announcements • Java 3.0.0-beta2 available for testing – Generic MongoCollection – New Codec infrastructure – Asynchronous Support – New core driver • Better support for JVM languages – https://github.com/mongodb/mongo-java- driver/releases/tag/r3.0.0-beta2 • RX Streams – testing only! – https://github.com/rozza/mongo-java-driver- reactivestreams
  • 8. http://www.humanandnatural.com/data/media/178/badan_jaran_desert_oasis_china.jpg Let's go and test this! http://www.tinypm.com/blog/wp-content/uploads/2015/01/hammer.jpg
  • 10. Getting Started • Review our documentation – http://docs.mongodb.org/ecosystem/drivers/java/
  • 12. Connecting public void connect() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //connect to host MongoClient mongoClient = new MongoClient(host); … }
  • 13. Connecting public void connect() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //connect to host MongoClient mongoClient = new MongoClient(host); … } Client Instance Host Machine
  • 14. Connecting public void connectServerAddress() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //using ServerAddress ServerAddress serverAddress = new ServerAddress(host); //connect to host MongoClient mongoClient = new MongoClient(serverAddress); … }
  • 15. Connecting public void connectServerAddress() throws UnknownHostException{ String host = "mongodb://localhost:27017"; //using ServerAddress ServerAddress serverAddress = new ServerAddress(host); //connect to host MongoClient mongoClient = new MongoClient(serverAddress); … } Server Address Instance
  • 16. Connecting public boolean connectReplicas() throws UnknownHostException{ //replica set members String []hosts = { "mongodb://localhost:30000", "mongodb://localhost:30001", "mongodb://localhost:30000", }; //list of ServerAdress List<ServerAddress> seeds = new ArrayList<ServerAddress>(); for (String h: hosts){ seeds.add(new ServerAddress(h)); } //connect to host MongoClient mongoClient = new MongoClient(seeds); … }
  • 17. Connecting public boolean connectReplicas() throws UnknownHostException{ //replica set members String []hosts = { "mongodb://localhost:30000", "mongodb://localhost:30001", "mongodb://localhost:30000", }; //list of ServerAdress List<ServerAddress> seeds = new ArrayList<ServerAddress>(); for (String h: hosts){ seeds.add(new ServerAddress(h)); } //connect to host MongoClient mongoClient = new MongoClient(seeds); … } Seed List
  • 18. Database & Collections public void connectDatabase(final String dbname, final String collname){ //database instance DB database = mongoClient.getDB(dbname); //collection instance DBCollection collection = database.getCollection(collname); https://api.mongodb.org/java/current/com/mongodb/DB.html https://api.mongodb.org/java/current/com/mongodb/DBCollection.html
  • 19. Security public void connectServerAddress() throws UnknownHostException{ String host = "localhost:27017"; ServerAddress serverAddress = new ServerAddress(host); String dbname = "test"; String userName = "norberto"; char[] password = {'a', 'b', 'c'}; MongoCredential credential = MongoCredential .createMongoCRCredential(userName, dbname, password); MongoClient mongoClient = new MongoClient(serverAddress, Arrays.asList(credential)); http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-java- driver/#authentication-optional
  • 21. Inserting public boolean insertObject(SimplePojo p){ //lets insert on database `test` String dbname = "test"; //on collection `simple` String collname = "simple"; DBCollection collection = mc.getDB(dbname).getCollection(collname); DBObject document = new BasicDBObject(); document.put("name", p.getName()); document.put("age", p.getAge()); document.put("address", p.getAddress()); //db.simple.insert( { "name": XYZ, "age": 45, "address": "49 Rue de Rivoli, 75001 Paris"}) collection.insert(document);… }
  • 22. Inserting public boolean insertObject(SimplePojo p){ //lets insert on database `test` String dbname = "test"; //on collection `simple` String collname = "simple"; DBCollection collection = mc.getDB(dbname).getCollection(collname); DBObject document = new BasicDBObject(); document.put("name", p.getName()); document.put("age", p.getAge()); document.put("address", p.getAddress()); //db.simple.insert( { "name": XYZ, "age": 45, "address": "49 Rue de Rivoli, 75001 Paris"}) collection.insert(document); … } Collection instance BSON wrapper
  • 23. Inserting public boolean insertObject(SimplePojo p){ … WriteResult result = collection.insert(document); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); … } https://api.mongodb.org/java/current/com/mongodb/DBObject.html https://api.mongodb.org/java/current/com/mongodb/WriteResult.html
  • 24. Update public long savePojo(SimplePojo p) { DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); //method replaces the existing database document by this new one WriteResult res = this.collection.save(document); //if it does not exist will create one (upsert) return res.getN(); }
  • 25. Update public long savePojo(SimplePojo p) { DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); //method replaces the existing database document by this new one WriteResult res = this.collection.save(document); //if it does not exist creates one (upsert) return res.getN(); } Save method
  • 26. Update public long updateAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); DBObject update = BasicDBObjectBuilder.start().add("name", p.getName()).add("age", p.getAge()).add("address", address).get(); return this.collection.update(query, update).getN(); }
  • 27. Update public long updateAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); DBObject update = BasicDBObjectBuilder.start().add("name", p.getName()).add("age", p.getAge()).add("address", address).get(); return this.collection.update(query, update).getN(); } Query Object Update Object
  • 28. Update public long updateSetAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); //db.simple.update( {"name": XYZ}, {"$set":{ "address": ...} } ) DBObject update = BasicDBObjectBuilder.start() .append("$set", new BasicDBObject("address", address) ).get(); return this.collection.update(query, update).getN(); }
  • 29. Update public long updateSetAddress( SimplePojo p, Address a ){ //{ 'name': XYZ} DBObject query = QueryBuilder.start("name").is(p.getName()).get(); DBObject address = BasicDBObjectBuilder.start() .add("street", a.getStreet()) .add("city", a.getCity()) .add("number", a.getNumber()) .add("district", a.getDistrict()).get(); //db.simple.update( {"name": XYZ}, {"$set":{ "address": ...} } ) DBObject update = BasicDBObjectBuilder.start() .append("$set", new BasicDBObject("address", address) ).get(); return this.collection.update(query, update).getN(); } Using $set operator http://docs.mongodb.org/manual/reference/operator/update/
  • 30. Remove public long removePojo( SimplePojo p){ //query object to match documents to be removed DBObject query = BasicDBObjectBuilder.start().add("name", p.getName()).get(); return this.collection.remove(query).getN(); }
  • 31. Remove public long removePojo( SimplePojo p){ //query object to match documents to be removed DBObject query = BasicDBObjectBuilder.start() .add("name", p.getName()).get(); return this.collection.remove(query).getN(); } Matching query
  • 32. Remove All public long removeAll( ){ //empty object removes all documents > db.simple.remove({}) return this.collection.remove(new BasicDBObject()).getN(); } Empty document http://docs.mongodb.org/manual/reference/method/db.collection.remove/
  • 34. WriteConcern //Default WriteConcern w1 = WriteConcern.ACKNOWLEDGED; WriteConcern w0 = WriteConcern.UNACKNOWLEDGED; WriteConcern j1 = WriteConcern.JOURNALED; WriteConcern wx = WriteConcern.REPLICA_ACKNOWLEDGED; WriteConcern majority = WriteConcern.MAJORITY; https://api.mongodb.org/java/current/com/mongodb/WriteConcern.html
  • 39. WriteConcern public boolean insertObjectWriteConcern(SimplePojo p){ … WriteResult result = collection.insert(document, WriteConcern.REPLICA_ACKNOWLEDGED); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); //log the last write concern used log.info( "Last write concern used "+ result.getLastConcern() );… }
  • 40. WriteConcern public boolean insertObjectWriteConcern(SimplePojo p){ … WriteResult result = collection.insert(document, WriteConcern.REPLICA_ACKNOWLEDGED); //log number of inserted documents log.debug("Number of inserted results " + result.getN() ); //log the last write concern used log.info( "Last write concern used "+ result.getLastConcern() ); … } Confirm on Replicas
  • 41. WriteConcern public void setWriteConcernLevels(WriteConcern wc){ //connection level this.mc.setWriteConcern(wc); //database level this.mc.getDB("test").setWriteConcern(wc); //collection level this.mc.getDB("test").getCollection("simple").setWriteConcern(wc); //instruction level this.mc.getDB("test").getCollection("simple").insert( new BasicDBObject() , wc); }
  • 43. Write Bulk public boolean bulkInsert(List<SimplePojo> ps){ … //initialize a bulk write operation BulkWriteOperation bulkOp = coll.initializeUnorderedBulkOperation(); for (SimplePojo p : ps){ DBObject document = BasicDBObjectBuilder.start() .add("name", p.getName()) .add("age", p.getAge()) .add("address", p.getAddress()).get(); bulkOp.insert(document); } //call the set of inserts bulkOp.execute(); … }
  • 44. Inserting Bulk public void writeSeveral( SimplePojo p, ComplexPojo c){ //initialize ordered bulk BulkWriteOperation bulk = this.collection.initializeOrderedBulkOperation(); DBObject q1 = BasicDBObjectBuilder.start() .add("name", p.getName()).get(); //remove the previous document bulk.find(q1).removeOne(); //insert the new document bulk.insert( c.encodeDBObject() ); BulkWriteResult result = bulk.execute(); //do something with the result result.getClass(); }
  • 46. Read public SimplePojo get(){ //basic findOne operation DBObject doc = this.collection.findOne(); SimplePojo pojo = new SimplePojo(); //casting to destination type pojo.setAddress((String) doc.get("address")); pojo.setAge( (int) doc.get("age") ); pojo.setAddress( (String) doc.get("address") ); return pojo; }
  • 47. Read public List<SimplePojo> getSeveral(){ List<SimplePojo> pojos = new ArrayList<SimplePojo>(); //returns a cursor DBCursor cursor = this.collection.find(); //iterates over the cursor for (DBObject document : cursor){ //calls factory or transformation method pojos.add( this.transform(document) ); } return pojos; }
  • 48. Read public List<SimplePojo> getSeveral(){ List<SimplePojo> pojos = new ArrayList<SimplePojo>(); //returns a cursor DBCursor cursor = this.collection.find(); //iterates over the cursor for (DBObject document : cursor){ //calls factory or transformation method pojos.add( this.transform(document) ); } return pojos; } Returns Cursor
  • 49. Read public List<SimplePojo> getAtAge(int age) { List<SimplePojo> pojos = new ArrayList<SimplePojo>(); DBObject criteria = new BasicDBObject("age", age); // matching operator { "age": age} DBCursor cursor = this.collection.find(criteria); // iterates over the cursor for (DBObject document : cursor) { // calls factory or transformation method pojos.add(this.transform(document)); } return pojos; } Matching operator
  • 50. Read public List<SimplePojo> getOlderThan( int minAge){ … DBObject criteria = new BasicDBObject( "$gt", new BasicDBObject("age", minAge)); // matching operator { "$gt": { "age": minAge} } DBCursor cursor = this.collection.find(criteria); … }
  • 51. Read public List<SimplePojo> getOlderThan( int minAge){ … DBObject criteria = new BasicDBObject( "$gt", new BasicDBObject("age", minAge)); // matching operator { "$gt": { "age": minAge} } DBCursor cursor = this.collection.find(criteria); … } Range operator http://docs.mongodb.org/manual/reference/operator/query/
  • 52. Read & Filtering public String getAddress(final String name) { DBObject criteria = new BasicDBObject("name", name); //we want the address field DBObject fields = new BasicDBObject( "address", 1 ); //and exclude _id too fields.put("_id", 0); // db.simple.find( { "name": name}, {"_id:0", "address":1} ) DBObject document = this.collection.findOne(criteria, fields); //we can check if this is a partial document document.isPartialObject(); return (String) document.get("address"); }
  • 53. Read & Filtering public String getAddress(final String name) { DBObject criteria = new BasicDBObject("name", name); //we want the address field DBObject fields = new BasicDBObject( "address", 1 ); //and exclude _id too fields.put("_id", 0); // db.simple.find( { "name": name}, {"_id:0", "address":1} ) DBObject document = this.collection.findOne(criteria, fields); //we can check if this is a partial document document.isPartialObject(); return (String) document.get("address"); } Select fields
  • 56. Read Preference – Tag Aware //read from specific tag DBObject tag = new BasicDBObject( "datacenter", "Porto" ); ReadPreference readPref = ReadPreference.secondary(tag); http://docs.mongodb.org/manual/tutorial/configure-replica-set-tag-sets/
  • 57. Read Preference public String getName( final int age ){ DBObject criteria = new BasicDBObject("age", age); DBObject fields = new BasicDBObject( "name", 1 ); //set to read from nearest node DBObject document = this.collection.findOne(criteria, fields, ReadPreference.nearest() ); //return the element return (String) document.get("name"); } Read Preference
  • 58. Aggregation // create our pipeline operations, first with the $match DBObject match = new BasicDBObject("$match", new BasicDBObject("type", "airfare")); // build the $projection operation DBObject fields = new BasicDBObject("department", 1); fields.put("amount", 1); fields.put("_id", 0); DBObject project = new BasicDBObject("$project", fields ); // Now the $group operation DBObject groupFields = new BasicDBObject( "_id", "$department"); groupFields.put("average", new BasicDBObject( "$avg", "$amount")); DBObject group = new BasicDBObject("$group", groupFields); …
  • 59. Aggregation // Finally the $sort operation DBObject sort = new BasicDBObject("$sort", new BasicDBObject("amount", -1)); // run aggregation List<DBObject> pipeline = Arrays.asList(match, project, group, sort); AggregationOutput output = coll.aggregate(pipeline);
  • 63. Morphia public class Employee { // auto-generated, if not set (see ObjectId) @Id ObjectId id; // value types are automatically persisted String firstName, lastName; // only non-null values are stored Long salary = null; // by default fields are @Embedded Address address; … }
  • 64. Morphia public class Employee { … //references can be saved without automatic loading Key<Employee> manager; //refs are stored**, and loaded automatically @Reference List<Employee> underlings = new ArrayList<Employee>(); // stored in one binary field @Serialized EncryptedReviews encryptedReviews; //fields can be renamed @Property("started") Date startDate; @Property("left") Date endDate; … }
  • 67. Jongo
  • 69. Others • DataNucleus JPA/JDO • lib-mongomapper • Kundera • Hibernate OGM
  • 71. Scala • http://docs.mongodb.org/ecosystem/drivers/scala/ • Cashbah – Java Driver Wrapper – Idiomatic Scala Interface for MongoDB • Community – Hammersmith – Salat – Reactive Mongo – Lift Web Framework – BlueEyes – MSSD
  • 75. MongoDB Hadoop Connector • MongoDB and BSON – Input and Output formats • Computes splits to read data • Support for – Filtering data with MongoDB queries – Authentication (and separate for configdb) – Reading from shard Primary directly – ReadPreferences and Replica Set tags (via MongoDB URI) – Appending to existing collections (MapReduce, Pig, Spark)
  • 76. For More Information Resource Location Case Studies mongodb.com/customers Presentations mongodb.com/presentations Free Online Training education.mongodb.com Webinars and Events mongodb.com/events Documentation docs.mongodb.org MongoDB Downloads mongodb.com/download Additional Info [email protected]

Editor's Notes

  • #28: Replacing objects highly inefficient and should be avoided.