Redland::Query

This class provides query language support for RDF models either via an adaptor class or direct by persistant storage.

Attributes

query[R]

Public Class Methods

create_finalizer(query) click to toggle source

You shouldn't use this. Used internally for cleanup.

# File rdf/redland/query.rb, line 36
def Query.create_finalizer(query)
  proc{|id| # "Finalizer on #{id}"
    #$log_final.info "closing query"
    Redland::librdf_free_query(query)
  }
end

new(query,language=nil,uri=nil,base_uri=nil) click to toggle source

Constructor - create a new Query object query - the query string language - the name of the query language uri - the URI identifying the query language

# File rdf/redland/query.rb, line 17
def initialize(query,language=nil,uri=nil,base_uri=nil)
  @language = language
  @uri = uri
  @query = Redland.librdf_new_query($world.world,language,uri,query,base_uri)
  return nil if not @query
  ObjectSpace.define_finalizer(self,Query.create_finalizer(@query))
end

Public Instance Methods

execute(model) click to toggle source

Execute a query on a model

# File rdf/redland/query.rb, line 26
def execute(model)
  results=Redland.librdf_query_execute(@query,model.model)
  if not results
    return nil
  else
    return QueryResults.new(results)
  end
end

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Redland::Query

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