Re: [Tracker] A question regarding to tracker search

[Martyn Russell <martyn lanedo com>]

On 17/03/10 02:09, Zheng, Huan wrote:
> Hi,

Hi,

> Is it possible for tracker to search like “ SELECT ?p WHERE {?p a
> nmm:MusicPiece . ?p nmm:performer [nmm:artistName ‘T*’]}”
>
> Please note, I used T* inside artistName, I want to search songs that
> their artist name start with T.
>
> Or further more, artist name to fit for some other regular expression.

Yes, you can use:

tracker-sparql -q "select ?p nmm:artistName(?a) where { ?p a 
nmm:MusicPiece ; nmm:performer ?a  }"

However, you might want to refine this a little. Perhaps using:

tracker-sparql -q "select ?p nmm:artistName(?a) nie:title(?p) where { ?p 
a nmm:MusicPiece ; nmm:performer ?a  }"

That way you get the track name too.

For doing filters you can use either fn:starts-with as below:

tracker-sparql -q "select ?p nmm:artistName(?a) nie:title(?p) where { ?p 
a nmm:MusicPiece ; nmm:performer ?a . FILTER 
(fn:starts-with(nmm:artistName(?a), \"T\")) }"

Or a regex:

tracker-sparql -q "select ?p nmm:artistName(?a) nie:title(?p) where { ?p 
a nmm:MusicPiece ; nmm:performer ?a . FILTER regex(nmm:artistName(?a), 
\"jovi\", \"i\") }"

This would find all of bon jovi's hits for example.

Hope this helps.

--
Regards,
Martyn