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

What?

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

Why?

To manage output results of a SPARQL query.

How?

In order to save the output of running 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 "outputformat" values that are supported, 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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