> On Wed, 2011-03-30 at 18:02 +0900, simon hong wrote:
>> 2011/3/28 Adrien Bustany <
abustany gnome org>
>
>> > 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) }
>
> 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.
