MongoDB and Spring Data Integration
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Transcript MongoDB and Spring Data Integration
MongoDB and Spring Data
Prepared for:
THE JAVA™ METROPLEX USERS GROUP
August 8th, 2012
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Who Am I?
Java Solutions Architect with ICF Ironworks
Adjunct Professor
Started with HTML and Lotus Notes in 1992
• In the interim there was C, C++, VB, Lotus Script, PERL, LabVIEW,
etc.
Not so much an Early Adopter as much as a Fast Follower of Java
Technologies
• Learned Java 1.1 in 1997, J2EE in 1999
Alphabet Soup (MCSE, ICAAD, ICASA, SCJP, SCJD, PMP, CSM)
LinkedIn: http://www.linkedin.com/in/iamjimmyray
Blog: http://jimmyraywv.blogspot.com/ Avoiding Tech-sand
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MongoDB and Spring Data
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Tonight’s Agenda
Quick introduction to NoSQL and MongoDB
• Configuration
• MongoView
Introduction to Spring Data and MongoDB support
• Spring Data and MongoDB configuration
• Templates
• Repositories
• Query Method Conventions
• Custom Finders
• Customizing Repositories
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Metadata Mapping (including nested docs and DBRef)
Aggregation Functions
GridFS File Storage
Indexes
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What is NoSQL?
Official: Not Only SQL
• In reality, it may or may not use SQL, at least in its truest form
• Varies from the traditional RDBMS approach of the last few decades
• Not necessarily a replacement for RDBMS; more of a solution for more
specific needs where is RDBMS is not a great fit
• Content Management (including CDNs), document storage, object storage,
graph, etc.
It means different things to different folks.
• It really comes down to a different way to view our data domains for
more effective storage, retrieval, and analysis
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From NoSQL-Database.org
“NoSQL DEFINITION: Next Generation Databases mostly
addressing some of the points: being non-relational, distributed,
open-source and horizontally scalable. The original intention has
been modern web-scale databases. The movement began early
2009 and is growing rapidly. Often more characteristics apply such
as: schema-free, easy replication support, simple API, eventually
consistent / BASE (not ACID), a huge amount of data and more.”
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Some NoSQL Flavors
Document Centric
• MongoDB
• Couchbase
Wide Column/Column
Families
• Cassandra
• Hadoop Hbase
Key/Value Stores
• Redis
Object
• DB4O
Other
• LotusNotes/Domino
XML
• MarkLogic
Graph
• Neo4J
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Why MongoDB
Open Source (written in C++)
Multiple platforms (Linux, Win, Solaris, Apple) and Language Drivers
Explicitly de-normalized
Document-centric and Schema-less
Fast (low latency)
• Fast access to data
• Low CPU overhead
Ease of scalability (replica sets), auto-sharding
Manages complex and polymorphic data
Great for CDN and document-based SOA solutions
Great for location-based and geospatial data solutions
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Why MongoDB (more)
Because of schema-less approach is more flexible, MongoDB is
intrinsically ready for iterative (Agile) projects.
Eliminates “impedance-mismatching” with typical RDBMS solutions
If You are already familiar with JavaScript and JSON, this is an easy
database to understand.
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What is schema-less?
A.K.A. schema-free
It means that MongoDB does not enforce a column data type on
the fields within your document, nor does it confine your document
to specific columns defined in a table definition.
The schema is actually controlled via the application API layers
and is implied by the “shape” (content) of your documents.
This means that different documents in the same collection can
have different fields.
• So the schema is flexible in that way
• Only the _id field is mandatory in all documents.
Requires more rigor on the application side.
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Why Not MongoDB
High speed and deterministic transactions:
• Banking and accounting
Where SQL is absolutely required
• Where Joins are needed
Traditional non-real-time data warehousing ops
If your organization lacks the controls and rigor to place schema
and document definition at the application level without
compromising data integrity
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MongoDB
Was designed to overcome some of the performance
shortcomings of RDBMS
Some Features
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Fast Querying
In place updates
Full Index support (including compound indexes)
Replication/High Availability (see CAP Theorem)
Auto Sharding for scalability
Aggregation, MapReduce
GridFS
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CAP Theorem
Consistency
Availability
Partition Tolerance (network partition tolerance)
You can never have all three, so you plan for two and make the
best of the third.
• For example: Perhaps “eventual consistency” is OK for a CDN
application.
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Container Models: RDBMS vs. MongoDB
RDBMS: Servers > Databases > Schemas > Tables > Rows
• Joins
MongoDB: Servers > Databases > Collections > Documents
• No Joins, Db References, Nested Documents, de-normalization
• Embedding and Linking
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MongoDB Collections
Schema-less
Can have up to 24000 (according to 10gen)
• Cheap to resource
Contain documents (…of varying shapes)
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MongoDB Documents
JSON (what you see)
• Actually BSON (Internal - Binary JSON - http://bsonspec.org/)
Elements are name/value pairs
16 MB maximum size
What you see is what is stored
• No default fields (columns)
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Why BSON?
Adds data types that JSON did not support
Optimized for performance
Adds compression
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MongoDB Install
Extract MongoDB
Build config file, or use startup script
Start Mongod (daemon) process
Use Shell (mongo) to access your database
Use MongoVUE for GUI access and to learn shell commands
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Mongo Shell
In Windows, mongo.exe
Command-line interface to MongoDB (sort of like SQL*Plus for
Oracle)
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MongoVUE
GUI around MongoDB Shell
Makes it easy to learn MongoDB Shell commands
• db.employee.find({ "lastName" : "Smith", "firstName" : "John"
}).limit(50);
• show collections
Demo…
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Web Admin Interface
Localhost:28017
Quick stats viewer
Run commands
Demo
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Spring Data
Large Spring project with many subprojects
• Category: Document Stores, Subproject MongoDB
“…aims to provide a familiar and consistent Spring-based
programming model…”
Like other Springs, Data is POJO Oriented
Provides high-level API and access to low-level API for managing
MongoDB documents.
Provides annotation-driven meta-mapping
Will allow you into bowels of API if you choose to hang out there
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Spring Data MongoDB Templates
Implements MongoOperations (mongoOps) interface
• mongoOps defines the basic set of MongoDB operations for the Spring
Data API.
• Wraps the lower-level MongoDB API
Provides access to the lower-level API
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Spring Data MongoDB Templates - Configuration
See mongo-config.xml
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Spring Data MongoDB Templates - Configuration
Or…see the config class
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Spring Data Repositories
Convenience for data access
• Spring does ALL the work
Convention over configuration
Hides complexities of Spring Data templates and underlying API
Builds implementation for you based on interface design
• Implementation is built during Spring container load.
Is typed (parameterized via generics) to the model objects you
want to store.
• When extending MongoRepository
• Otherwise uses @RepositoryDefinition
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Spring Data Meta Mapping
Annotation-driven mapping of model object fields to Spring Data
elements in specific database parlance.
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MongoDB DBRef
Optional
Instead of nesting documents
Have to save the “referenced” document first, so that DBRef exists
before adding it to the “parent” document
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MongoDB Custom Spring Data Repositories
Hooks into Spring Data bean type hierarchy that allows you to add
functionality to repositories
Important: You must write the implementation for this custom
repository, using the class name for the Spring Data generated
class
And…your Spring Data repository interface must extend this
custom interface
Demo
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MongoDB Advanced Queries
http://www.mongodb.org/display/DOCS/Advanced+Queries#Advan
cedQueries-%24all
Demo - $in, $nin, $gt, $all
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MongoDB Aggregation Functions
Aggregation Framework
Map/Reduce
Distinct - Demo
Group - Demo
• Similar to SQL Group By function
Count
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MongoDB GridFS
“…specification for storing large files in MongoDB.”
As the name implies, “Grid” allows the storage of very large files
divided across multiple MongoDB documents.
• Uses native BSON binary formats
16MB per document
• Will be higher in future
Large files added to GridFS get chunked and spread across
multiple documents.
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MongoDB Indexes
Similar to RDBMS Indexes
Can have many
Can be compound
Makes searches, aggregates, and group functions faster
Makes writes slower
Sparse = true
• Only include documents in this index that actually contain a value in the
indexed field.
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MongoDB Security
Default is trusted mode, no security
--auth
--keyfile
• Replica sets require this option
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MongoDB Encryption
MongoDB does not support data encryption, per se
Use application-level encryption and store encrypted data in BSON
fields
Or…use TDE (Transparent Data Encryption) from Gazzang
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Helpful Links
Spring Data MongoDB - Reference Documentation:
http://static.springsource.org/spring-data/datamongodb/docs/1.0.2.RELEASE/reference/html/
http://nosql-database.org/
www.mongodb.org
http://www.mongodb.org/display/DOCS/Java+Language+Center
http://www.mongodb.org/display/DOCS/Books
http://openmymind.net/2011/3/28/The-Little-MongoDB-Book/
http://jimmyraywv.blogspot.com/2012/05/mongodb-and-spring-data.html
http://jimmyraywv.blogspot.com/2012/04/mongodb-jongo-and-morphia.html
https://www.10gen.com/presentations/webinar/online-conference-deep-divemongodb
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Questions
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