Class: SPARQL::Algebra::Operator::Using
- Inherits:
-
SPARQL::Algebra::Operator
- Object
- SPARQL::Algebra::Operator
- SPARQL::Algebra::Operator::Using
- Includes:
- Query
- Defined in:
- lib/sparql/algebra/operator/using.rb
Overview
The SPARQL UPDATE using
operator.
The USING and USING NAMED clauses affect the RDF Dataset used while evaluating the WHERE clause. This describes a dataset in the same way as FROM and FROM NAMED clauses describe RDF Datasets in the SPARQL 1.1 Query Language
[44] UsingClause ::= ‘USING’ ( iri | ‘NAMED’ iri )
Constant Summary collapse
- NAME =
:using
Constants inherited from SPARQL::Algebra::Operator
Constants included from Expression
Instance Attribute Summary
Attributes included from Query
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#execute(queryable, **options, &block) ⇒ RDF::Queryable
Executes this upate on the given
writable
graph or repository. -
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
Methods included from Query
#each_solution, #empty?, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables
Methods inherited from SPARQL::Algebra::Operator
#aggregate?, arity, #base_uri, base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars
Methods included from Expression
cast, #constant?, #evaluate, extension, extension?, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?
Constructor Details
This class inherits a constructor from SPARQL::Algebra::Operator
Instance Method Details
#execute(queryable, **options, &block) ⇒ RDF::Queryable
Executes this upate on the given writable
graph or repository.
Delegates to Dataset
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# File 'lib/sparql/algebra/operator/using.rb', line 68 def execute(queryable, **, &block) debug() {"Using"} Dataset.new(*operands).execute(queryable, **.merge(depth: [:depth].to_i + 1), &block) end |
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
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# File 'lib/sparql/algebra/operator/using.rb', line 78 def to_sparql(**) str = "\n" + operands.first.map do |op| "USING #{op.to_sparql(**)}\n" end.join("") content = operands.last.to_sparql(top_level: false, **) str << Operator.to_sparql(content, project: nil, **) end |