SPARQL_HTTP

SPARQL_HTTP is a SPARQL HTTP Client for Ruby. It is developed together with the Goo library but it hash been designed as an standalone component that can be used separately.

HOW-TO

Instatiate endpoint

config = { :name => :local_repo , :host => "localhost", :port => 8080 , :options => { } }
SparqlRd::Repository.configuration(store)
epr = SparqlRd::Repository.endpoint(store[:local_repo])

Assert Triples in a Graph

rdf_document = <<eos
 <a> <b> <c> .
 <c> <x> <d> .
eos
test_graph = "https://github.com/ncbo/sparqlrd/"
epr.append_in_graph(rdf_document, test_graph, SparqlRd::Utils::MimeType.turtle)

Query Data

rs = epr.query("SELECT * WHERE { GRAPH <#{test_graph}> { ?s ?p ?o .} }")
rs.each_solution do |sol|
    s,p,o = sol.get(:s), sol.get(:p), sol.get(:o)
    puts "#{s.value} #{p.value} #{o.value}"
    if o.literal?
        #access to string value
        puts o.value
        #access to parsed value based on XSD types
        puts o.parsed_value
    end
end

Update Data

update = <<eos
INSERT DATA { 
    GRAPH <https://github.com/ncbo/sparqlrd/> {
     <https://github.com/ncbo/sparqlrd/subject> <https://github.com/ncbo/sparqlrd/name> "msalvadores"; 
                  <https://github.com/ncbo/sparqlrd/worksAt> "Stanford" .
}
}
eos
epr.update(update)