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RDF::REDLAND::QUERY(3PM) - Linux man page online | Library functions

Redland RDF Syntax Query Class.

Chapter
2018-03-01
RDF::Redland::Query(3pm) User Contributed Perl Documentation RDF::Redland::Query(3pm)

NAME

RDF::Redland::Query - Redland RDF Syntax Query Class

SYNOPSIS

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; }

DESCRIPTION

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.

SEE ALSO

RDF::Redland::QueryResults

AUTHOR

Dave Beckett - http://www.dajobe.org/
perl v5.26.1 2018-03-01 RDF::Redland::Query(3pm)
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