[Nepomuk] Result sorting with Nepomuk Querylib

[Sebastian Trüg]

On 09/18/2011 07:36 PM, Vishesh Handa wrote:
> Hey Sebastian
> 
> I was working on my note taking application, and I want all the
> resources which are notes. So, I did this -
> 
> Nepomuk::Query::ResourceTypeTerm typeTerm( Nepomuk::Types::Class(
> PIMO::Note() ) );
> Nepomuk::Query::Query query( typeTerm );
> 
> which was fine. Then I realized that I wanted the notes to be sorted
> according to the last modification date.
> 
> Currently, I'm doing this -
> 
>     Nepomuk::Query::ResourceTypeTerm typeTerm( Nepomuk::Types::Class(
> PIMO::Note() ) );
>     Nepomuk::Query::Query query( typeTerm );
> 
>     Nepomuk::Query::Query::RequestProperty rp( NAO::lastModified(), false );
>     query.addRequestProperty( rp );
>    
>     QString sparql = query.toSparqlQuery() + " order by desc(?reqProp1)";

Ahhhhhh, my eyes, I think I am blind!!!!!! :P

This is what you do:

ComparisonTerm term(NAO::lastModified(), Term());
term.setSortWeight(1, Qt::DescendingOrder);
Query query = ResourceTypeTerm(PIMO::Note()) && term;

and if you want the value of the date simply add:
term.setVariableName(QLatin1String("date"));

and fetch it through Result::additionalBindings.

Actually you can read it here:
http://api.kde.org/4.x-api/kdelibs-apidocs/nepomuk/html/classNepomuk_1_1Query_1_1ComparisonTerm.html#_details

Cheers,
Sebastian

>     client->sparqlQuery( sparql );
> 
> Is it possible that you forgot to implement sorting in the query lib?
> Cause I can't seem to find how to do it.
> 
> -- 
> Vishesh Handa