Redland RDF Application Framework - Perl RDF::Redland::QueryResults Class

NAME

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

SYNOPSIS

  use RDF::Redland;
  ...
  my $query=new RDF::Redland::Query("rdql", undef, $query_string);
  my $results=$model->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;
  }

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

DESCRIPTION

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.

CONSTRUCTOR

There are no public constructors.

METHODS

count
Return the number of current results from the query.
finished
Return non-0 if the results have been exhausted.
binding_name INDEX
Get the name of variable binding INDEX in the array of variable names.
binding_names
Get the names all of the variable bindings as an array.
binding_value INDEX
Get the value of the variable binding INDEX in the current query result.
binding_values
Get the values of all of the variable bindings in the current query result.
binding_value_by_name NAME
Get the value of the variable binding NAME in the current query result.
bindings
Get the variable names and values of the current query result as a hash
bindings_count
Return the number of variable bindings.
next_result
Move to the next query result.

SEE ALSO

the RDF::Redland::Query manpage

AUTHOR

Dave Beckett - http://purl.org/net/dajobe/


Copyright 2000-2004 Dave Beckett, Institute for Learning and Research Technology, University of Bristol