4S-QUERY(1J) - Linux man page online | User commands

Run SPARQL queries on a 4store storage backend.

August 5, 2020
4S-QUERY(1J) 4store 4S-QUERY(1J)


4s-query — Run SPARQL queries on a 4store storage backend


4s-query kb-name [-f format] [-O optimisation-level] [-I insert-mode] [-r] [-s soft-limit] [-b base-URI] [-e] [-P] [query] -f Set the format to output results it, options are "sparql", "text", "json", and "testcase" -O, --opt-level Set the optimisation level of the query engine, in the range 0-3. -I, --insert Treat CONSTRUCT statements as INSERT statements. This feature is highly experimental and largely untested. -r, --restricted Enable query complexity restriction mode -s, --soft-limit Override default soft limit on search breadth -d, --default-graph Enable SPARQL default graph support -b, --base Set base URI for queries -e, --explain Return an explanation of the query planner's decisions -P Enable programatic IO mode


If [query] is omitted then 4s-query goes into interactive mode, suitable for trying queries from the command line. -P enables programmatic interactive mode, suitable for interfacing with processes via stdin and stdout. Queries are sent as UTF-8 bytes, terminated with "#EOQ" on a line of it's own, results are returned, ending with "#EOR". Interacting with 4store in this way is more effi‐ cient than using the SPARQL protocol, but non-standard.


4s-import(1), 4s-httpd(1), 4s-backend(1), 4s-delete-model(1)


4s-query implements the SPARQL Query Language specification (aka. SPARQL/Query 1.0) and the SPARQL Result Format specification (aka. SPARQL/Results 1.0). Default graph support is no normally enabled, the --default-graph turns it on, as does spec‐ ifying FROM <default:> in the query. Data loaded with $ 4s-import kb --add -m default: uri/filename will be added to the default graph.


$ 4s-query -f sparql demo 'SELECT * WHERE { ?s ?p ?s } LIMIT 10' Return 10 random triples from the knowledgebase "demo" in the SPARQL XML result format. $ 4s-query -P demo < query.rq Run the query in query.rq and output the result to stdout
4store August 5, 2020 4store
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4s-query(1J) referred by 4s-backend-setup(1J) | 4s-import(1J) | 4store.conf(5J)
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