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graph://select

Executes a SPARQL SELECT query against the RDFGraph in the exchange body and returns the query results. By default, results are returned as an in-memory List<BindingSet> (RDF4J's native representation). You can also serialize the results to JSON, CSV, XML, or TSV by setting the dumpFormat parameter.

The query can be provided either inline as a string or loaded from an external file via a ChimeraResource.

Parameters

Parameter Type Required Default Description
query String No* — Inline SPARQL SELECT query string.
chimeraResource ChimeraResourceBean No* — Resource pointing to a file containing the SPARQL SELECT query. See ChimeraResource.
dumpFormat String No memory Output format for the query results. memory: returns List<BindingSet>. json, csv, xml, tsv: returns a serialized string.

*At least one of query or chimeraResource must be provided.

Example

from("direct:select")
    .setVariable("q", constant("SELECT ?s ?p ?o WHERE { ?s ?p ?o }"))
    .toD("graph://select?query=${variable.q}&dumpFormat=json");

- route:
    from: "direct:select"
    steps:
      - setVariable:
          name: q
          constant: "SELECT ?s ?p ?o WHERE { ?s ?p ?o }"
      - toD: "graph://select?query=${variable.q}&dumpFormat=json"