Sha256: 222e54941801ef6abb7caa6aa1c55e8f813a2cdbf64f48d2dd4490efbdb00f10
Contents?: true
Size: 1.38 KB
Versions: 9
Compression:
Stored size: 1.38 KB
Contents
require 'active_rdf_helpers'
# Direct access for Redland adapter
#
# Syntax
# "<http://......>" = Resource
# "abc" = Literal
# "_:" = Blank Node
# "_:123" = Blank Node with id
class DirectAccess
# Execute a SPARQL query. The second parameter specify the result format (:json, :xml, :array) (optional)
#
# The return default value is an Array.
# If you specify :xml or :json in result_format, the return value is a String that contain the request format.
#
# Example: query("SELECT ?p ?o WHERE {<http://activerdf.org/test/eyal> ?p ?o}", :json)
def self.sparql_query(query, result_format=:array)
# verify input
if query.nil?
raise ActiveRdfError, "cannot execute empty query"
end
# verify class type
if query.class != String
raise ActiveRdfError, "query must be String."
end
# execute query
FederationManager.query(query, {:result_format => result_format})
end
# Find all triple by subject and predicate
# The return value is a PropertyList
def self.find_all_by_subject_and_predicate(s,p)
# verify input
if s.nil? || p.nil?
raise ActiveRdfError, "subject and predicate can't be nil"
end
# execute query
query_result = self.sparql_query("SELECT ?o WHERE {#{s} #{p} ?o}")
# return propertyList
return PropertyList.new(p, query_result, s)
end
end
Version data entries
9 entries across 9 versions & 1 rubygems