How to output the results of a SPARQL query run against the /sparql endpoint to a file in Virtuoso?

Why?

To manage output results of a SPARQL query.

What?

Save the output results of a SPARQL query that is executed against Virtuoso SPARQL Endpoint using curl command.

How?

To save the output of a SPARQL query against the Virtuoso /sparql endpoint to a file, a curl command of the following form can be run:


curl --request POST 'http://hostname:portno/sparql/?' --header 'Accept-Encoding: gzip' 
--data 'format=outputformat' --data-urlencode 'query=SPARQLQuery' --output 'filename.gz'

The supported "outputformat" values, are detailed in the SPARQL Protocol Extensions section of the Virtuoso documentation.

Usage Example

The following example demonstrates how to save the output of a simple CONSTRUCT Query that returns the first 5 triples from the Quad store in JSON format:


$ curl --request POST 'http://localhost:8890/sparql/?' --header 'Accept-Encoding: gzip' --data 'format=json' --data-urlencode 'query=CONSTRUCT { ?s ?p ?o } WHERE { ?s ?p ?o }LIMIT 5' --output 'filename.gz'

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   398    0   288  100   110  41854  15986 --:--:-- --:--:-- --:--:-- 48000
$ gzip -cd filename.gz | more

{ "head": { "link": [], "vars": [ "s", "p", "o" ] },
  "results": { "distinct": false, "ordered": true, "bindings": [
    { "s": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }      , "p": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }  , "o": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#Property" }},
    { "s": { "type" : "uri", "value" : "http://www.openlinksw.com/virtrdf-data-formats#default-iid-nullable" }  , "p": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }  , "o": { "type" : "uri", "value" : "http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat" }},
    { "s": { "type" : "uri", "value" : "http://www.openlinksw.com/virtrdf-data-formats#default-iid" }   , "p": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }  , "o": { "type" : "uri", "value" : "http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat" }},
    { "s": { "type" : "uri", "value" : "http://www.openlinksw.com/virtrdf-data-formats#default-iid-nonblank-nullable" } , "p": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }  , "o": { "type" : "uri", "value" : "http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat" }},
    { "s": { "type" : "uri", "value" : "http://www.openlinksw.com/virtrdf-data-formats#default-iid-nonblank" }  , "p": { "type" : "uri", "value" : "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }  , "o": { "type" : "uri", "value" : "http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat" }} ] } }
$

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