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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `deleteData` operator.
#
# The DELETE DATA operation removes some triples, given inline in the request, if the respective graphs in the Graph Store contain those
#
# [39] DeleteData ::= 'DELETE DATA' QuadData
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# PREFIX foaf: <http://xmlns.com/foaf/0.1/>
# DELETE DATA {
# :a foaf:knows :b .
# }
#
# @example SSE
# (prefix ((: <http://example.org/>) (foaf: <http://xmlns.com/foaf/0.1/>))
# (update (deleteData ((triple :a foaf:knows :b)))))
#
# @see https://www.w3.org/TR/sparql11-update/#deleteData
class DeleteData < Operator::Unary
include SPARQL::Algebra::Update
NAME = [:deleteData]
##
# Executes this upate on the given `writable` graph or repository.
#
# @param [RDF::Queryable] queryable
# the graph or repository to write
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @option options [Boolean] debug
# Query execution debugging
# @return [RDF::Queryable]
# Returns queryable.
# @raise [IOError]
# If `from` does not exist, unless the `silent` operator is present
# @see https://www.w3.org/TR/sparql11-update/
def execute(queryable, **options)
operand.each do |op|
debug(options) {"DeleteData #{op.to_sxp}"}
queryable.delete(op)
end
queryable
end
##
#
# Returns a partial SPARQL grammar for this term.
#
# @return [String]
def to_sparql(**options)
"DELETE DATA {\n" +
operands.first.to_sparql(top_level: false, delimiter: ". \n", **options) +
"\n}"
end
end # DeleteData
end # Operator
end; end # SPARQL::Algebra
Version data entries
6 entries across 6 versions & 1 rubygems