Class: SPARQL::Algebra::Operator::DeleteData

Inherits:
Operator::Unary
  • Object
show all
Includes:
Update
Defined in:
lib/sparql/algebra/operator/delete_data.rb

Overview

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

Examples:

SPARQL Grammar

PREFIX     : <http://example.org/> 
PREFIX foaf: <http://xmlns.com/foaf/0.1/> 
DELETE DATA {
  :a foaf:knows :b .
}

SSE

(prefix ((: <http://example.org/>) (foaf: <http://xmlns.com/foaf/0.1/>))
 (update (deleteData ((triple :a foaf:knows :b)))))

See Also:

Constant Summary collapse

NAME = 
[:deleteData]

Instance Method Summary collapse

Methods included from Update

#empty?, #graph_name=, #unshift, #variables

Instance Method Details

#execute(queryable, **options) ⇒ RDF::Queryable

Executes this upate on the given writable graph or repository.

Parameters:

  • queryable (RDF::Queryable) —

    the graph or repository to write

  • options (Hash{Symbol => Object}) —

    any additional keyword options

Options Hash (**options):

  • debug (Boolean) —

    Query execution debugging

Returns:

Raises:

  • (IOError) —

    If from does not exist, unless the silent operator is present

See Also:



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# File 'lib/sparql/algebra/operator/delete_data.rb', line 42

def execute(queryable, **options)
  operand.each do |op|
    debug(options) {"DeleteData #{op.to_sxp}"}
    queryable.delete(op)
  end
  queryable
end

#to_sparql(**options) ⇒ String

Returns a partial SPARQL grammar for this term.

Returns:

  • (String) 


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# File 'lib/sparql/algebra/operator/delete_data.rb', line 55

def to_sparql(**options)
  "DELETE DATA {\n" +
    operands.first.to_sparql(top_level: false, delimiter: ". \n", **options) +
    "\n}"
end