RDF::Redland::Query(3pm)

Usage

  use RDF::Redland;
  ...
  my $query=new RDF::Redland::Query($query_string); # default query language
  my $results=$query->execute($model);
  # or my $results=$model->query_execute($query);
  while(!$results->finished) {
    for (my $i=0; $i < $results->bindings_count(); $i++) {
      my $name=$results->binding_name($i);
      my $value=$results->binding_value($i);
      # ... do something with the results
    }
    $results->next_result;
  }

Overview

This class represents queries of various syntaxes over an RDF::Redland::Model returning a sequence of results that (currently) bind variable names to RDF::Redland::Node values.

Constructors

new QUERY-STRING [BASE-URI [QUERY-LANG-URI [QUERY-LANG]]]: Create a new RDF::Redland::Query object for a query string QUERY-STRING with optional base URI BASE-URI IN QUERY language QUERY-LANG or query language URI QUERY-LANG-URI (both can be undef). If QUERY-LANG-URI is omitted, the current directory is used as the base URI. If QUERY-LANG-NAME is undef, the default query language "rdql" is used. If BASE-URI is omitted, no base URI is used.

Methods

execute MODEL: Run the query against model MODEL returning a RDF::Redland::QueryResults object or undef on failure.

Releases

11 releases since Debian 3.1 (Sarge); the text changed 10 times.

3.1
4.0
5.0
6.0
7
8
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