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Class

Redland::Query

In:

rdf/redland/query.rb

Parent:

Object

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

Methods

create_finalizer execute new

Attributes

query [R]

Public Class methods

create_finalizer(query)

You shouldn‘t use this. Used internally for cleanup.

[Source]

# 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)

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

[Source]

# 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)

Execute a query on a model

[Source]

# 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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