Hi, 2011/3/30 Philip Van Hoof <[email protected]>
> On Wed, 2011-03-30 at 18:02 +0900, simon hong wrote: > > 2011/3/28 Adrien Bustany <[email protected]> > > > > I guess you can use the tracker:modified or tracker:added properties > here > > > (I'd recommend tracker:modified, but am not sure how it's defined for > newly > > > saved resources). > > > > Now, I use "SELECT nie:url(?u) WHERE {?u a nfo:Audio}" to get audio > files. > > I don't know how to use above properties (tracker:modified or > > tracker:added) for fetching newly added files. > > Can you give some advice how to make sparql query for my purpose? > > Or any documentation or guide for sparql will be appreciate. > > So for synchronization what you do is the following: > > SELECT MAX (tracker:modified (?r)) { ?r a rdfs:Resource } > > And you store the result > > Then next time you start your application, to get the newly added and > the changed resources you put that stored value in $stored and you do: > > SELECT ?r { ?r a nfo:Audio . > FILTER (tracker:modified (?r) > $stored) } > > For synchronization, above method works well for media files in rootfs but not in removable media. When I insert my usb stick again without any modification, MAX (tracker:modifed(?r)) value is increased again. Is it a bug? Note that this is for nfo:Audio, but it works with any rdfs:Resource > > > > Note that instead of looping, you could also use the GraphUpdated > signal to > > > get updates in real time. > > > > GraphUpdated signal is what I wanted ^^; It works well :) > > If GraphUpdated works for you, then indeed use that. > > Cheers, > > Philip > > > -- > > > Philip Van Hoof > freelance software developer > Codeminded BVBA - http://codeminded.be > >
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