Thanks a lot, I will try it out
-----Original Message-----
From: Martyn Russell [mailto:[email protected]]
Sent: Wednesday, March 17, 2010 4:27 PM
To: Zheng, Huan
Cc: [email protected]
Subject: Re: [Tracker] A question regarding to tracker search
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
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