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Understanding EclipseLink, 2.5
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Non-SQL Standard Database Support: NoSQL

EclipseLink JPA can be used with NoSQL databases. A Java class can be mapped to a NoSQL datasource using the @NoSQL annotation or <no-sql> XML element.

EclipseLink also provides JPA access to EIS (Enterprise Information Systems) such as legacy databases and systems (CICS, ADA, VSAM, IMS, MQ, AQ).

EclipseLink's NoSQL support allows complex hierarchical data to be mapped, including XML, indexed, and hierarchical mapped data such as JSON data. CRUD operations, embedded objects and collections, inheritance, and relationships are supported. A subset of JPQL and the Criteria API are supported, dependent on the NoSQL database's query support.

It is also possible to add support for other NoSQL data-sources by defining your own EISPlatform subclass and JCA adapter. There are also several user-contributed platforms in the EclipseLink incubator project. See "Platform Incubator" at this URL:

http://wiki.eclipse.org/EclipseLink/Development/Incubator/Platform

Table A-3 lists the NoSQL and EIS data-sources that are supported by EclipseLink. For more information on the Java classes listed in the table, see Java API Reference for EclipseLink.

Table A-3 Supported NoSQL and EIS Platforms

Data-source Java Class Features

MongoDB

org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform

Provides MongoDB support including:

  • MAPPED JSON data

  • JPQL and Criteria queries

  • Native queries

  • hints for READ_PREFERENCE, WRITE_CONCERN, OPTIONS, SKIP, LIMIT, BATCH_SIZE

Oracle NoSQL

org.eclipse.persistence.nosql.adapters.nosql.OracleNoSQLPlatform

Provides Oracle NoSQL support including:

  • MAPPED key/value data

  • XML data

  • find() and SELECT all queries

  • hints for CONSISTENCY, DURABILITY, TIMEOUT, VERSION

XML files

org.eclipse.persistence.eis.adapters.xmlfile.XMLFilePlatform

Provides support for persistence to XML file including:

  • XML data

  • find() and SELECT all queries

  • XPath interactions

JMS

org.eclipse.persistence.eis.adapters.jms.JMSPlatform

Provides support for persistence through JMS messaging:

  • XML data

  • send/receive operations

Oracle AQ

org.eclipse.persistence.eis.adapters.aq.AQPlatform

Provides support for persistence through Oracle AQ messaging:

  • XML data

  • enqueue/dequeue operations


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