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.IX Title "RDF::Redland::Query 3pm"
.TH RDF::Redland::Query 3pm 2024-03-17 "perl v5.38.2" "User Contributed Perl Documentation"
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.SH NAME
RDF::Redland::Query \- Redland RDF Syntax Query Class
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  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;
\&  }
.Ve
.SH DESCRIPTION
.IX Header "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.
.SH CONSTRUCTORS
.IX Header "CONSTRUCTORS"
.IP "new QUERY-STRING [BASE\-URI [QUERY\-LANG\-URI [QUERY\-LANG]]]" 4
.IX Item "new QUERY-STRING [BASE-URI [QUERY-LANG-URI [QUERY-LANG]]]"
Create a new RDF::Redland::Query object for a query string \fIQUERY-STRING\fR
with optional base URI \fIBASE-URI\fR
IN QUERY language \fIQUERY-LANG\fR or query language URI \fIQUERY-LANG-URI\fR
(both can be undef).
If \fIQUERY-LANG-URI\fR is omitted, the current directory is used as the base URI.
If \fIQUERY-LANG-NAME\fR is undef, the default query language "rdql" is used. 
If \fIBASE-URI\fR is omitted, no base URI is used.
.SH METHODS
.IX Header "METHODS"
.IP "execute MODEL" 4
.IX Item "execute MODEL"
Run the query against model \fIMODEL\fR returning a RDF::Redland::QueryResults
object or undef on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Redland::QueryResults
.SH AUTHOR
.IX Header "AUTHOR"
Dave Beckett \- http://www.dajobe.org/