CODEWITHSUNDEEP
rdfjenasemantic-webtriplestoreturtle-rdf
Josh Hanna
Josh Hanna

Reputation: 55

How do I export a Jena SDB model from the command line?

I've got a moderately sized (25 million or so triples) Jena SDB database that I'd like to export to an N3 formatted file. How might I approach this?

I've tried using the sdbdump tool that's included with Jena, but all that comes out of the DB is prefixes. Here's the connection info from my sdb.ttl file:

<#conn> rdf:type sdb:SDBConnection ;     
    sdb:sdbType       "mysql" ;
    sdb:sdbHost       "localhost" ;
    sdb:sdbName       "dbname" ;
    sdb:engine        "InnoDB" ;

Here's the command I'm invoking:

./bin/sdbdump --out=N3

As far as I can tell, $SDBROOT is set up properly, and sdbdump doesn't complain about it being incorrect.

What am I missing? Is this the right approach to creating a N3 file from a moderately sized MySQL-backed Jena SDB database?

Upvotes: 0

Views: 186

Answers (1)

RobV
RobV

Reputation: 28675

I would guess that your database contains named graphs and has nothing in the default graph.

Since Turtle is a triples only format sdbdump would only output triples in the default graph when invoked

If you want to dump named graphs then you likely need to use a format that supports named graphs e.g.

./bin/sdbdump --out=NQUADS

Upvotes: 1

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