Thanks, will try it later! >On what exact page did you see this example? http://live.gnome.org/Tracker/Documentation/Writeback
-----Original Message----- From: Jürg Billeter [mailto:j...@bitron.ch] Sent: Friday, June 11, 2010 6:08 PM To: Zheng, Huan Cc: tracker-list@gnome.org Subject: Re: [Tracker] Some questions about tracker delete Hi, On Fri, 2010-06-11 at 14:53 +0800, Zheng, Huan wrote: > Hi, I have several questions regarding to DELETE capability inside > tracker. > > Seems tracker works well with INSERT, but not that well with DELETE. > > > > 1, I can’t delete the nie:contentLastModified time which I manually > inserted before. The below function won’t work, but it is an example > in tracker wiki page > > tracker-sparql -u -q " DELETE { ?f nie:contentLastModified ?unknown } > WHERE { ?f nie:url <file:///home/zbt/Videos/video/ball_444.jpg> } " You need to use ?unknown in the graph pattern as well. The following should work: tracker-sparql -u -q "DELETE { ?f nie:contentLastModified ?unknown } WHERE { ?f nie:url <file:///home/zbt/Videos/video/ball_444.jpg> ; nie:contentLastModified ?unknown } " On what exact page did you see this example? > 2, I can’t *completely* delete a tag that I inserted before, after > delete, only the nao:prefLabel is cleared. > > INSERT works: > > tracker-sparql -u -q "INSERT { _:tag a nao:Tag ; nao:prefLabel > 'value' ; nao:identifier 'key' . ?object nao:hasTag _:tag } WHERE > { ?object a nie:InformationElement . FILTER (str(?object) = > 'urn:uuid:bc9feedf-89ce-b9ed-fdba-5300586651dd') }" > > then DELETE: > > tracker-sparql -u -q "DELETE {?tag a nao:Tag } WHERE {?object > nao:hasTag ?tag . ?tag nao:identifier 'key' . { SELECT ?object WHERE > {?object a nie:InformationElement . FILTER (str(?object) = > 'urn:uuid:bc9feedf-89ce-b9ed-fdba-5300586651dd') } } }" To completely delete the tag resource, use the following update: tracker-sparql -u -q "DELETE {?tag a rdfs:Resource } WHERE {?object nao:hasTag ?tag . ?tag nao:identifier 'key' . { SELECT ?object WHERE {?object a nie:InformationElement . FILTER (str(?object) = 'urn:uuid:bc9feedf-89ce-b9ed-fdba-5300586651dd') } } }" > > then QUERY: > > tracker-sparql -q "SELECT nao:prefLabel(?tag) > nao:identifier(?tag) ?tag WHERE {?object a nie:InformationElement; > nao:hasTag ?tag . ?tag nao:identifier 'key' . FILTER (str(?object) = > 'urn:uuid:bc9feedf-89ce-b9ed-fdba-5300586651dd')}" For all of the above three queries, it should be possible to avoid the FILTER and just directly <urn:uuid:bc9feedf-89ce-b9ed-fdba-5300586651dd> instead of ?object, or am I missing something? Regards, Jürg _______________________________________________ tracker-list mailing list tracker-list@gnome.org http://mail.gnome.org/mailman/listinfo/tracker-list
