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https://issues.apache.org/jira/browse/JENA-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216780#comment-13216780
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Andy Seaborne commented on JENA-215:
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It would be interesting to see this done.
I have a very quick look at OrientDB.
Personally, I'd step back from asking how to map SDB or anything else to
OreintDb but to first think about how the unique features of OrientDB can be
best used to store RDF. With an general sense of what the design is, looking
at what existing bits and pieces provides is easier.
Specifically to the SDB point:
SDB translates parts of SPARQL queries to SQL. The SQL uses joins (for basic
graph patterns) and leftjoin (or optional). So in lookign at OrientDB Iooked
for joins given it calls itself a NoSQL database. The document suggests it's
support for SQL is really that here is an SQL-like language for access to one
table at a time.
The syntax is:
SELECT [<Projections>] FROM <Target> [WHERE <Condition>*] [ORDER BY <Fields>*
[ASC|DESC]*] [LIMIT <MaxRecords>]
FROM <target> means no joins. In (full) SQL, that would be a list of tables.
That's not to say that OrientDB is unsuitable - just that expecting it to act
as a specific engine for SQL may not be quite so straight forward.
Maybe TDB is a better starting point using OrientDB embedded. OreintDB may be
an excellent indexing engine for either RDF stored verbosely (i.e. a layout of
string, string, string for SPO even though it repeats strings) or RDF mapped to
nodeid and a node table (normalized) , which is what TDB does.
> Can Jena be used with NOSQL databases?
> --------------------------------------
>
> Key: JENA-215
> URL: https://issues.apache.org/jira/browse/JENA-215
> Project: Apache Jena
> Issue Type: Question
> Components: SDB, TDB
> Environment: OrientDB, MongoDB etc.
> Reporter: Rajeev B
> Labels: newbie
>
> I see that Jena supports many relational/sql databases to be used as RDF
> stores, through SDB, RDB.
> And it doesn't support NOSQL databases like MongoDB, OrientDB & many others
> like them.
> I am wondering where I could start, to integrate OrientDb with Jena! Should I
> start with downloading SDB docs and sources?
> what would be the important things to look at?
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