rdf::redland::query(3pm) [debian man page]

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)

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

NAME

       RDF::Redland - Redland RDF Class

SYNOPSIS

	 use RDF::Redland;
	 my $storage=new RDF::Redland::Storage("hashes", "test", "new='yes',hash-type='memory'");
	 my $model=new RDF::Redland::Model($storage, "");

	 ...

DESCRIPTION

       This class initialises the Redland RDF classes.

       See the main classes for full detail: RDF::Redland::Node, RDF::Redland::BlankNode, RDF::Redland::URINode, RDF::Redland::LiteralNode,
       RDF::Redland::XMLLiteralNode, RDF::Redland::URI, RDF::Redland::Statement, RDF::Redland::Model, RDF::Redland::Storage, RDF::Redland::Parser,
       RDF::Redland::Query, RDF::Redland::QueryResults, RDF::Redland::Iterator, RDF::Redland::Stream and RDF::Redland::RSS.

STATIC METHODS

       set_log_handler SUB
	   Set SUB as the subroutine to be called on any Redland error, warning or log message.  The subroutine must have the followign signature:

	     sub handler ($$$$$$$$$) {
	       my($code, $level, $facility, $message, $line, $column, $byte, $file, $uri)=@_;
	       # int error code
	       # int log level
	       # int facility causing the error (parsing, serializing, ...)
	       # string error message
	       # int line number (<0 if not relevant)
	       # int column number (<0 if not relevant)
	       # int byte number (<0 if not relevant)
	       # string file name or undef
	       # string URI or undef

	       # ...do something with the information ...
	     };

	     RDF::Redland::set_log_handler(&handler);

       reset_log_handler
	   Reset redland to use the default logging handler, typically printing the message to stdout or stderr and exiting on a fatal error.

       set_error_handler SUB
	   The method set_log_handler is much more flexible than this and includes this functionality.

	   Set SUB as the subroutine to be called on a Redland error with the error message as the single argument.  For example:

	     RDF::Redland::set_error_handler(sub {
	       my $msg=shift;
	       # Do something with $msg
	     });

	   The default if this is not set, is to run die $msg

       set_warning_handler SUB
	   The method set_log_handler is much more flexible than this and includes this functionality.

	   Set SUB as the subroutine to be called on a Redland warning with the warning message as the single argument.  For example:

	     RDF::Redland::set_warning_handler(sub {
	       my $msg=shift;
	       # Do something with $msg
	     });

	   The default if this is not set, is to run warn $msg

SEE ALSO

       RDF::Redland::Node, RDF::Redland::BlankNode, RDF::Redland::URINode, RDF::Redland::LiteralNode, RDF::Redland::XMLLiteralNode,
       RDF::Redland::URI, RDF::Redland::Statement, RDF::Redland::Model, RDF::Redland::Storage, RDF::Redland::Parser, RDF::Redland::Query,
       RDF::Redland::QueryResults, RDF::Redland::Iterator, RDF::Redland::Stream and RDF::Redland::RSS.

AUTHOR

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

perl v5.14.2							    2012-03-11							 RDF::Redland(3pm)