updated the download rdb url link

Author: Gaurav SinghaRoy

app/assets/javascripts/resources/sparql.js

@@ -41,7 +41,11 @@ SPARQL = {
     },
     download : {
         rdb : function(){
-            window.open(Utils.rdf2any.server+Utils.rdf2any.actions.convert+"rdb-converter.sql?dataset="+QueryBuilder.datasets.get_selected()+"&query="+encodeURIComponent($("#txt_sparql_query").val()));
+            var download_url = Utils.rdf2any.server+Utils.rdf2any.actions.convert+"rdb-converter.sql?dataset="+QueryBuilder.datasets.get_selected()+"&query="+encodeURIComponent($("#txt_sparql_query").val());
+            var selected_class = QueryBuilder.classes.get_selected_class();
+            if(selected_class != undefined && selected_class != '')
+                download_url += "&for_class="+selected_class
+            window.open(download_url);
         },
         csv : function(){
             window.open(Utils.rdf2any.server+Utils.rdf2any.actions.convert+"csv-converter.csv?dataset="+QueryBuilder.datasets.get_selected()+"&query="+encodeURIComponent($("#txt_sparql_query").val()));