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The SPARQL query you pasted is correct, so not sure why you would get this error. Can you see a file named 38-nmm.ontology in $prefix/share/tracker/ontologies ? I think that query worked for you if ran with the tracker-sparql tool, so it should work all the same if ran using libtracker-sparql. I might be a bit stubborn, but QSparql works all fine on ARM, both Harmattan and MeeGo use it. I'm insisting a bit because: 1. The asynchronous models of GLib and Qt are a bit different, QSparql abstracts that nicely. 2. QSparql will make your memory management more c++-y, with objects on stack freed automatically etc. The example code you pasted presents various memory management errors (leaks). 3. QSparql allow you do deal with bindings, so that you don't have to escape the data you pass to your queries, and other niceties. Compiling/packaging QSparql is easy, and it does not take much space. If you want to make it minimal, you can enable only the driver you need (most likely QTRACKER_DIRECT), and maybe even compile it in statically (iirc). Cheers Adrien Le Fri, 5 Aug 2011 11:28:23 +0530, <[email protected]> a écrit : > Hello Adrien, > > Thanks for you concern. I am developing on an arm > platform where qsparql is not available. > > > > I am also getting an error as > > > > Error Message 1.44: syntax error, use of undefined prefix `nmm' > > Can you enlighten me on this error, why we get this error?? > > > > Thnks > > Suparno > > > > > > -----Original Message----- > From: Adrien Bustany [mailto:[email protected]] > Sent: Friday, August 05, 2011 11:20 AM > To: Suparno Bose (WT01 - Manufacturing & Hi Tech) > Cc: [email protected]; [email protected] > Subject: Re: [Tracker] Tracker-WARNING **: file is encrypted or is > not a database > > > > Hello Suparno! > > > > Did you have a look at QSparql? It'll give you access to Tracker in a > much more Qt-ish way. In any case, you can have a look at the > examples for either library, that might help you get started: > > libtracker-sparql (not so simple one): > > http://git.gnome.org/browse/tracker/tree/examples/libtracker-sparql/async-connection.c > <http://git.gnome.org/browse/tracker/tree/examples/libtracker-sparql/async-connection.c> > > > qsparql: > > https://maemo.gitorious.org/maemo-af/qsparql/blobs/master/examples/sparql/simple/main.cpp > <https://maemo.gitorious.org/maemo-af/qsparql/blobs/master/examples/sparql/simple/main.cpp> > > > > > In your case, not sure why tracker_sparql_connection_get would fail... > > What platform are you developing on? Are there special restrictions > to the DB access? > > > > Cheers > > > > Adrien > > > > Le Fri, 5 Aug 2011 10:05:28 +0530, > > <[email protected] <mailto:[email protected]> > a écrit : > > > > > Hi Martyn, > > > > > > Here is what am doing inside my application : > > > > > > > > > > > > g_type_init(); > > > > > > GError *error = NULL; > > > > > > m_connection = tracker_sparql_connection_get_direct(&error); > > > > > > qDebug() << error->message; > > > > > > if(m_connection != NULL) > > > > > > { > > > > > > gchar *query; > > > > > > query = g_strdup_printf ("SELECT ?url WHERE { ?song a > > > nmm:MusicPiece ; nie:isStoredAs ?as . ?as nie:url ?url . }"); > > > > > > if(0 != query) > > > > > > m_cursor = tracker_sparql_connection_query (m_connection, > > > query, NULL, &error); > > > > > > else > > > > > > printf("Query is null \n"); > > > > > > > > > > > > if(0 != error) > > > > > > { > > > > > > g_print("Error Message %s\n", error->message); > > > > > > //qDebug() << error->message; > > > > > > g_free (query); > > > > > > } > > > > > > else > > > > > > printf("No error returned from the SPARQL\n"); > > > > > > > > > > > > if(0 != m_cursor) > > > > > > print_cursor (m_cursor, "No classes were found to match > > search > > > term", "Classes", TRUE, l_list); > > > > > > else > > > > > > printf("cursor is NULL \n"); > > > > > > } > > > > > > else > > > > > > { > > > > > > qDebug() << "connection not establisheds"; > > > > > > } > > > > > > > > > > > > -----Original Message----- > > > From: Martyn Russell [mailto:[email protected]] > > > Sent: Thursday, August 04, 2011 6:53 PM > > > To: Suparno Bose (WT01 - Manufacturing & Hi Tech) > > > Cc: [email protected] > > > Subject: Re: [Tracker] Tracker-WARNING **: file is encrypted or is > > not > > > a database > > > > > > > > > > > > On 04/08/11 13:31, [email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] <mailto:[email protected]> > > > wrote: > > > > > > > Attaching the file > > > > > > > > > > > > Thanks, > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: Suparno Bose (WT01 - Manufacturing& Hi Tech) > > > > > > > Sent: Thursday, August 04, 2011 6:00 PM > > > > > > > To: 'Martyn Russell' > > > > > > > Cc: [email protected] <mailto:[email protected]> > > > > > > > Subject: RE: [Tracker] Tracker-WARNING **: file is encrypted or > > > is > > > > not > > > > > > > > > > a database > > > > > > > > > > > > > > Sorry Martyn , > > > > > > > I did some mistake. Please find my new log attached. > > > > > > > This time it worked fine from the command line but not from the > > > > > > > application . > > > > > > > > > > > > I see, so how are you doing it form the application then? The > > command > > > line tools are there to help you sanity check what you're > > application > > > might be doing. > > > > > > > > > > > > -- > > > > > > Regards, > > > > > > Martyn > > > > > > > > > > > > Founder and CEO of Lanedo GmbH. > > > > > > _______________________________________________ tracker-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/tracker-list
