Virtuoso Open-Source Edition

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    • VOS.VirtTipsAndTricksGuideLOADCommandRDF(Last) -- DAVWikiAdmin? , 2017-06-13 05:38:14 Edit
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    WebDAV System Administrator 2017-06-13 05:38:14

    How can I use the LOAD command to import RDF data?

    SPARQL INSERT can be done using the LOAD command:

    SPARQL INSERT INTO <..> { .... } [[FROM ...] { ... }]

SPARQL LOAD <x> [INTO <y>]

-- <ResourceURL> will be the Graph IRI of the loaded data:
SPARQL LOAD <ResourceURL>

    Examples

    Load from Resource URL

    In order to load data from resource URL for ex: http://www.w3.org/People/Berners-Lee/card#i , execute the following command with isql:

    SQL> SPARQL LOAD <http://www.w3.org/People/Berners-Lee/card#i>;
callret-0
VARCHAR
_______________________________________________________________________________

Load <http://www.w3.org/People/Berners-Lee/card#i> into graph <http://www.w3.org/People/Berners-Lee/card#i> -- done

1 Rows. -- 703 msec.
SQL>

    Load from file

    1. Create DAV collection which is visible to the public, for ex: http://localhost:8890/DAV/tmp
    2. Upload to the DAV collection a file, for example with name listall.rq and with the following content: 

      SPARQL
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX sioc: <http://rdfs.org/sioc/ns#>
SELECT ?x ?p ?o
FROM <http://mygraph.com>
WHERE
  {
    ?x rdf:type sioc:User .
    ?x ?p ?o.
    ?x sioc:id ?id .
    FILTER REGEX(str(?id), "^King")
  }
ORDER BY ?x

    3. Execute the following command from isql: 

      SQL>SPARQL LOAD bif:concat ("http://", bif:registry_get("URIQADefaultHost"), "/DAV/tmp/listall.rq") into graph <http://myNewGraph.com>;
callret-0
VARCHAR
_______________________________________________________________________________

Load <http://localhost:8890/DAV/tmp/listall.rq> into graph <http://myNewGraph.com> -- done

1 Rows. -- 321 msec.

    Directly LOAD triples using iSQL

    Triples can be directly loaded into Virtuoso specifying the literal values to inserted, by executing a command of the following form from isql:

    SQL>SPARQL INSERT INTO graph <http://mygraph.com>
{
  <http://myopenlink.net/dataspace/Kingsley#this>
  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
  <http://rdfs.org/sioc/ns#User> .

  <http://myopenlink.net/dataspace/Kingsley#this>
  <http://rdfs.org/sioc/ns#id>
  <Kingsley> .

  <http://myopenlink.net/dataspace/Caroline#this>
  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
  <http://rdfs.org/sioc/ns#User> .

  <http://myopenlink.net/dataspace/Caroline#this>
  <http://rdfs.org/sioc/ns#id>
  <Caroline> .
};

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