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RDF::Redland::QueryResults(3pm) User Contributed Perl Documentation RDF::Redland::QueryResults(3pm)

RDF::Redland::QueryResults - Redland RDF Syntax Query Results Class

  use RDF::Redland;
  ...
  my $query=new RDF::Redland::Query("query string", undef, undef, "sparql");
  my $results=$model->query_execute($query);
  # or my $results=$query->execute($model);
  while(!$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;
  }

The $results in the example is an object of class RDF::Redland::QueryResults.

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

There are no public constructors.

Return the number of current results from the query.
Return non-0 if the results have been exhausted.
Get the name of variable binding INDEX in the array of variable names.
Get the names all of the variable bindings as an array.
Get the value of the variable binding INDEX in the current query result.
Get the values of all of the variable bindings in the current query result.
Get the value of the variable binding NAME in the current query result.
Get the variable names and values of the current query result as a hash
Return the number of variable bindings.
Move to the next query result.
Return a new RDF::Redland::Stream object representing the query results as an RDF Graph.
Serialize to a string syntax in format FORMAT-URI using the optional BASE-URI. The default format when none is given is determined by librdf_query_results_to_string.
Return non-0 if the query results format is variable bindings
Return non-0 if the query results format is a boolean
Return non-0 if the query results format is an RDF graph
Get the boolean query result; non-0 is true.

RDF::Redland::Query

Dave Beckett - http://www.dajobe.org/

2023-01-31 perl v5.36.0