Samizdat: Co-op Engine

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Graffiti 2.1 (2011-12-25)

Graffiti RDF store now uses Sequel instead of DBI for relational database access. Sequel understands named parameters, so there's no more need for the awkward passing of re-ordered params list in SquishSelect#to_sql and Store#select, both methods now return just the translated SQL query. The query itself will have the column names aliased to blank node names from the Squish query where applicable.

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Example

  require 'sequel'
  require 'yaml'
  require 'graffiti'

  db = Sequel.connect(:adapter => 'pg', :database => dbname)
  config = File.open('rdf.yaml') {|f| YAML.load(f.read) }
  store = Graffiti::Store.new(db, config)

  data = store.fetch(%{
    SELECT ?date, ?title
    WHERE (dc::date ?r ?date FILTER ?date >= :start)
          (dc::title ?r ?title)
    ORDER BY ?date DESC}, 10, 0, :start => Time.now - 24*3600)

  puts data.first[:title]