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SPARQL client for Ruby.
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README.md

SPARQL Client for RDF.rb

This is a pure-Ruby implementation of a SPARQL client for RDF.rb.

Features

  • Executes queries against any SPARQL 1.0-compatible endpoints over HTTP.
  • Provides a query builder DSL for ASK, SELECT, DESCRIBE and CONSTRUCT queries.
  • Supports tuple result sets in both XML and JSON formats, with JSON being the preferred default for content negotiation purposes.
  • Supports graph results in any RDF serialization format understood by RDF.rb.
  • Returns results using the RDF.rb object model.
  • Supports accessing endpoints as read-only RDF::Repository instances.

Examples

require 'sparql/client'

sparql = SPARQL::Client.new("http://dbpedia.org/sparql")

Executing a boolean query and outputting the result

# ASK WHERE { ?s ?p ?o }
result = sparql.ask.whether([:s, :p, :o]).true?

puts result.inspect   #=> true or false

Executing a tuple query and iterating over the returned solutions

# SELECT * WHERE { ?s ?p ?o } OFFSET 100 LIMIT 10
query = sparql.select.where([:s, :p, :o]).offset(100).limit(10)

query.each_solution do |solution|
  puts solution.inspect
end

Executing a graph query and iterating over the returned statements

# CONSTRUCT { ?s ?p ?o } WHERE { ?s ?p ?o } LIMIT 10
query = sparql.construct([:s, :p, :o]).where([:s, :p, :o]).limit(10)

query.each_statement do |statement|
  puts statement.inspect
end

Executing an arbitrary textual SPARQL query string

result = sparql.query("ASK WHERE { ?s ?p ?o }")

puts result.inspect   #=> true or false

Documentation

http://sparql.rubyforge.org/client/

  • {SPARQL::Client}
    • {SPARQL::Client::Query}
    • {SPARQL::Client::Repository}

Dependencies

Installation

The recommended installation method is via RubyGems. To install the latest official release of the SPARQL::Client gem, do:

% [sudo] gem install sparql-client

Download

To get a local working copy of the development repository, do:

% git clone git://github.com/bendiken/sparql-client.git

Alternatively, you can download the latest development version as a tarball as follows:

% wget http://github.com/bendiken/sparql-client/tarball/master

Resources

Authors

License

SPARQL::Client is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying UNLICENSE file.

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