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https://issues.apache.org/jira/browse/JDO-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991993#comment-12991993
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Andy Jefferson commented on JDO-651:
------------------------------------
One further possible requirement. With a document-based store (e.g MongoDB),
the datastore stores objects in JSON document format. With this (and with
XML-based storage also for that matter), you have two options in terms of
"embedding" a persistable field.
class Foo
{
@Embedded
Bar bar;
}
Option 1 : store the related object embedded as a document in the document of
the owner (i.e nested)
Option 2 : map all fields of the related object to "field" names in the
document of the owner (like we would do it for RDBMS).
Would be nice to have a meta-data way of defining these two situations
distinctly.
> Modify specification to address NoSQL datastores
> ------------------------------------------------
>
> Key: JDO-651
> URL: https://issues.apache.org/jira/browse/JDO-651
> Project: JDO
> Issue Type: New Feature
> Components: api, specification, tck
> Affects Versions: JDO 3
> Reporter: Matthew T. Adams
> Assignee: Matthew T. Adams
> Labels: jdo, nosql, profile, specification
> Fix For: JDO 3 maintenance release 1
>
>
> There is increasing interest in NoSQL datastores (Google BigTable, Apache
> HBase, VMWare Redis, etc), which not only do not support SQL, but also do not
> necessarily provide support for traditional consistency or queriability
> features or guarantees, instead offering features like eventual consistency,
> key-value storage mechanisms, etc.
> This request is to modify the JDO specification (and TCK & RI) so that it
> relaxes certain portions of the specification, perhaps in the form of
> profiles similar to JavaEE 6 profiles, to allow datastores that may not
> support queries in general, do not support the ACID requirements, or that
> support key-value-based storage mechanisms to be JDO-compliant. Additions to
> the specification may also be needed in order to directly address NoSQL-type
> datastores, in a manner similar to its treatment of relational persistence
> mechanisms.
> Additionally, this request would serve to better support persistence on micro
> platforms where consistency, queriability, etc, may not be supported.
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