Virtuoso Open-Source Edition

  • Topic
  • Discussion

    • How can I use CONSTRUCT with Prepared Statements?

    Assume a given query which uses pragma output:format '_JAVA_' with CONSTRUCT:
    SPARQL DEFINE output:format '_JAVA_'
   CONSTRUCT { ?s ?p ?o }
WHERE
  { 
    ?s ?p ?o . 
    FILTER (?s = iri(?::0)) 
  }
LIMIT 1

    In order to work correctly, the query should be modified to:

    SPARQL DEFINE output:format '_JAVA_'
   CONSTRUCT { `iri(?::0)` ?p ?o }
WHERE
  { 
    `iri(?::0)` ?p ?o 
  }
LIMIT 1

    Equivalent variant of the query is also:

    SPARQL DEFINE output:format '_JAVA_'
  CONSTRUCT { ?s ?p ?o }
WHERE
  { 
    ?s ?p ?o . 
    FILTER (?s = iri(?::0)) 
  }
LIMIT 1

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