1. MongoDB + JAVA + Spring data
Anton Sulzhenko
Java Software Engineer
Anton_Sulzhenko@epam.com

2. MongoDB + Java + Spring Data
MongoDB
Java
Spring Data

3. 3
MongoDB Java Spring Data
What is NoSQL?
• Non-relational data
• Schemaless
• No JOINs, No complex transactions
• Horizontal scalability

4. 4
MongoDB Java Spring Data
• Key-value(Redis, MemcaheDB)
• Wide column(BigTable, Cassandra, HBase)
• Document(MongoDB, CouchDB, Riak)
• Graph(Neo4j, FlockDB)

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MongoDB Java Spring Data

6. MongoDB
Documented-oriented database

7. 7
MongoDB Java Spring Data
MongoDB Terminology
RDBMS Mongo DB
Database Database
Table Collection
Row JSON document
Column Field
Index Index
Join Embedded documents & linking
Aggregation (e.g. group by) Aggregation framework

8. 8
MongoDB Java Spring Data
MongoDB Features
• JSON data model with dynamic schemas
• CRUD operations
• Atomic document operations
• Ad hoq Queries like SQL (equality, regexp, ranges, geospatial)
• Full, flexible index support
• Auto-sharding for horizontal scalability
• Built-in replication and high availability

9. 9
MongoDB Java Spring Data
MongoDB Drivers
• One wire protocol for all client languages
• A driver implementation per language
• Responsibilities:
- Converting language dependent data structures <-> BSON
- Generating ObjectId for _id field

10. 10
MongoDB + Java + Spring Data
MongoDB
Java
Spring Data

11. 11
MongoDB Java Spring Data
MongoDB Java Driver Features
• CRUD
• Support for replica sets
• Connection pooling
• Distributed reads to slave servers
• BSON serializerdesirializer
• JSON serializerdesirializer
• GridFS

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MongoDB Java Spring Data
MongoDB Java Driver Usage

13. 13
MongoDB + Java + Spring Data
MongoDB
Java
Spring Data

14. SPRING DATA
MongoDB

15. 15
MongoDB Java Spring Data
Spring Data MongoDB
• Templating
• Resource abstraction
• Configure connections to mongod/mongos node(s)
• Collection lifecycle (create/drop)
• Map/Reduce / Aggregation
• Object mapping
• Annotation based: @Document, @Field, @Index etc.
• Classes are mapped to collections, Java Objects to documents
• Repository Support
• Queries are derived from method signatures
• Geospatial Queries

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MongoDB Java Spring Data
Instantiating MongoTemplate using XML based metadata:

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MongoDB Java Spring Data
Sample CRUD operations using MongoTemplate:

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MongoDB Java Spring Data
Mapping annotation overview:
• @Id
• @Document
• @DBRef
• @Indexed
• @CompoundIndex
• @GeoSpatialIndexed
• @Transient
• @PersistenceConstructor
• @Value

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MongoDB Java Spring Data

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MongoDB Java Spring Data
Spring Data MongoDB: Repositories
• Main concept:
• Use the signature of a method to derive the query(at runtime)
• Base implementations / abstractions for
• CRUD operations
• Paging
• Sorting

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MongoDB Java Spring Data
Spring Data MongoDB: Repositories

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MongoDB Java Spring Data
Spring Data MongoDB: Repositories
Supported keywords for query methods:
Keyword Logical result
GreaterThan {"age" : {"$gt" : age}}
LessThan {"age" : {"$lt" : age}}
Between {"age" : {"$gt" : from, "$lt" : to}}
IsNotNull, NotNull {"age" : {"$ne" : null}}
IsNull, Null {"age" : null}
Like {"age" : age} ( age as regex)
(No keyword) {"age" : name}
Not {"age" : {"$ne" : name}}
Near {"location" : {"$near" : [x,y]}}
Within {"location" : {"$within" : {"$center" : [ [x, y], distance]}}}
Within {"location" : {"$within" : {"$box" : [ [x1, y1], x2, y2]}}}

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MongoDB Java Spring Data
Spring Data MongoDB: Repositories

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MongoDB Java Spring Data
• Map/Reduce / Aggregation framework
• Index management
• Support for GridFS
• Geospatial indexes/queries
• Optimistic Locking

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MongoDB Java Spring Data
• 10gen Education
• https://education.10gen.com/
• Spring Data - MongoDB
• http://www.springsource.org/spring-data/mongodb
• The Little MongoDB Book
• http://openmymind.net/2011/3/28/The-Little-MongoDB-Book/

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Questions?
MongoDB
Java
Spring Data
Anton Sulzhenko Anton_Sulzhenko@epam.com