RDF Data Access & Management

Load Geonames RDF dump into Virtuoso

The following Virtuoso procedure may be used to load the Geonames RDF dump, thus provided that the dump persists in its current format :

create procedure DB.DBA.import_geonames_dataset(in rdfdump_path  
varchar, in graph_uri varchar)
{
   declare rdfdump_str, line, nb_processed, process_records, msg_str  
any;
     declare exit handler for sqlstate '2200*'
   {
       goto znext;
   };        rdfdump_str := file_to_string_output(rdfdump_path);
     nb_processed := 0;
     line := ses_read_line(rdfdump_str); -- URL line

   while(isstring(line))
   {
       nb_processed := nb_processed + 1;

       if(mod(nb_processed, 1000) = 0)
       {
           result_names(line);
           result(line);
       }
             if(mod(nb_processed, 50000) = 0)
       {
           result_names(msg_str);
           msg_str := 'Checkpoint in progress...';
           result(msg_str);
                     exec('checkpoint');
                     msg_str := 'Checkpoint in finished';
           result_names(msg_str);
           result(msg_str);
       }
             line := ses_read_line(rdfdump_str); -- RDF document line
             DB.DBA.RDF_LOAD_RDFXML(line, graph_uri, graph_uri);
	     znext:;
             line := ses_read_line(rdfdump_str); -- skip: URL line
   }
};

DB.DBA.import_geonames_dataset('/dbs/rdfdata/rdfdumps/geonames/all- 
geonames-rdf.txt', 'http://geonames.org');