Re: [Tracker] RDF Queries

[Michael Lissner <mlissner michaeljaylissner com>]

I agree, it seems like tracker-query could use some love, or what I 
would suggest is that its functionality should be folded in with 
tracker-search-tool so the whole RDF thing can be left behind.

For the list of supported extractors, it would be useful not just to be 
able to list them, but to be able to change them too...without 
recompiling the thing. So, say I figure out that I *don't* have music 
meta extraction installed, and I want that. What then?

dpkg -l | grep -i tracker yields:
% dpkg -l  | grep -i tracker
ii  libdeskbar-tracker                                  
0.6.6-1ubuntu5.1                        metadata database, indexer and 
search tool -
ii  libtracker-gtk0                                     
0.6.6-1ubuntu5.1                        GTK+ widgets for apps that use 
tracker
ii  libtrackerclient0                                   
0.6.6-1ubuntu5.1                        metadata database, indexer and 
search tool -
ii  tracker                                             
0.6.6-1ubuntu5.1                        metadata database, indexer and 
search tool
ii  tracker-search-tool                                 
0.6.6-1ubuntu5.1                        metadata database, indexer and 
search tool -
ii  tracker-utils                                       
0.6.6-1ubuntu5.1                        metadata database, indexer and 
search tool -

Mike



Martyn Russell wrote:
> Michael Lissner wrote:
> > Cool. Some responses below, though I still haven't gotten the query 
> > to work... :)
>
> :)
>
> > > This is how I call it:
> > >
> > >     tracker_search_query_async (priv->client,
> > >                     time (NULL),
> > >                     instance->service_type,
> > >                     NULL, /* Fields */
> > >                     NULL, /* Search text */
> > >                     NULL, /* Keywords */
> > >                     instance->rdf_query,
> > >                     instance->current_pos,
> > >                     ELEMENTS_PER_QUERY,
> > >                     FALSE, /* Sort by service */
> > >                     instance->sort_fields,
> > >                     FALSE, /* Sort descending */
> > >                     query_get_data_cb,
> > >                     instance);
> > >
> > > Are you calling this function, if so, how?
>
> This is function call in libtracker.
>
> > I'm simply using the terminal to call: tracker-query queryFile.rdf. I 
> > don't know the function that you're mentioning above. I'm guessing 
> > it's from the source code?
>
> Hmm, perhaps tracker-query needs some love then.
>
> > > > I also ran tracker-extract on the mp3 file that I was expecting to 
> > > > get a hit from, and it didn't return any meta data. I'm guessing 
> > > > that means that tracker isn't gathering meta data from music files? 
> > > > If that's true, is it possible to change the config so it will?
> > >
> > > This depends on a few things:
> > >
> > > 1. What extractors are supported - configure should give you a 
> > > summary of that.
> > Can you explain how to check that? I'm just running stock Ubuntu...
>
> You would have to build the package yourself to know that. Perhaps we 
> should have some sort of utility to list supported extractors.
>
> > > 2. The MP3 itself. What exactly does tracker-extract output for that 
> > > file if you use:
> > >
> > >  /usr/libexec/tracker-extract -v 3 -f /path/to/filename
> > Well, my version of tracker-extract throws an error when I give it 
> > those arguments. It doesn't seem to have a -v argument, nor a -f 
> > argument. When I run it without those, it extracts nothing at 
> > all...suspicious, eh? Assuming tracker isn't indexing this info, is 
> > there a way to make it?
>
> Hmm, what version of Tracker are you using? (dpkg -l |grep -i tracker)