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 v5.14.2 2011-02-04 RDF::Redland::Query(3pm)