Add prepackaged Queries

[WolfgangFahl]

Instead of publishing the full SPARQL endpoint allow selected queries to be executed. e.g.

PREFIX cr: <http://cr.bitplan.com/>
SELECT  ?source (COUNT(?source) AS ?sourcecount)
WHERE { 
   ?event cr:Event_source ?source.
}
GROUP by ?source

[WolfgangFahl]

and same for SQL e.g.

select 
            source,count(*) as count 
            from event
            group by source
        union 
        select 
            "TOTAL",count(*) as count
            from event
            order by count