vos_query: Run a SPARQL query

In virtuoso: Interface to 'Virtuoso' using 'ODBC'

Description

Run a SPARQL query

Usage

vos_query(con, query)

Arguments

con	a ODBC connection to Virtuoso, from vos_connect()
query	a SPARQL query statement

Details

SPARQL is a graph query language similar in syntax SQL, but allows the use of variables to walk through graph nodes.

Value

a data.frame containing the results of the query

References

• https://en.wikipedia.org/wiki/SPARQL

• https://docs.ropensci.org/rdflib/articles/rdf_intro.html

See Also

vos_start(), vos_connect()

Examples

vos_status()

if(has_virtuoso()){
vos_start()
con <- vos_connect()

# show first 4 triples in the database
DBI::dbGetQuery(con, "SPARQL SELECT * WHERE { ?s ?p ?o } LIMIT 4")
}

virtuoso documentation built on Nov. 3, 2021, 1:07 a.m.