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<title>Tracker SPARQL Library Reference Manual: Updating the Store</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="tracker-examples-writeonly"></a>Updating the Store</h2></div></div></div>
<p>
In order to perform updates in the store, a new
<span class="type"><a class="link" href="TrackerSparqlConnection.html#TrackerSparqlConnection-struct" title="struct TrackerSparqlConnection">TrackerSparqlConnection</a></span>
object must be acquired with
<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-get" title="tracker_sparql_connection_get ()">tracker_sparql_connection_get</a></code>.
Note that you MUST NOT use a specific direct-access connection obtained with
<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-get-direct" title="tracker_sparql_connection_get_direct ()">tracker_sparql_connection_get_direct</a></code>, as the direct-access method only supports read-only queries.
</p>
<p>
Once a proper connection object has been acquired, the update can be launched either
synchronously (<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-update" title="tracker_sparql_connection_update ()">tracker_sparql_connection_update</a></code>)
or asynchronously (<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-update-async" title="tracker_sparql_connection_update_async ()">tracker_sparql_connection_update_async</a></code>).
If launched asynchronously, the result of the operation can be obtained with
<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-update-finish" title="tracker_sparql_connection_update_finish ()">tracker_sparql_connection_update_finish</a></code>.
</p>
<p>
Once you no longer need the connection, remember to call <code class="function"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></code>
for the <span class="type"><a class="link" href="TrackerSparqlConnection.html#TrackerSparqlConnection-struct" title="struct TrackerSparqlConnection">TrackerSparqlConnection</a></span>.
</p>
<p>
The following program shows how a synchronous update can be done to the store:
</p>
<pre class="programlisting">
#include <tracker-sparql.h>
int main (int argc, const char **argv)
{
GError *error = NULL;
<span class="type"><a class="link" href="TrackerSparqlConnection.html#TrackerSparqlConnection-struct" title="struct TrackerSparqlConnection">TrackerSparqlConnection</a></span> *connection;
const gchar *query =
"INSERT { "
" _:tag a nao:Tag ; "
" nao:prefLabel 'mylabel' . "
"} WHERE { "
" OPTIONAL { "
" ?tag a nao:Tag ; "
" nao:prefLabel 'mylabel' "
" } . "
"FILTER (!bound(?tag)) "
"}";
/* Do NOT get a direct connection if you're going to do some write
* operation in the Store. The NULL represents a possible
* GCancellable.
*/
connection = <code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-get" title="tracker_sparql_connection_get ()">tracker_sparql_connection_get</a></code> (NULL, &error);
if (!connection) {
g_printerr ("Couldn't obtain a connection to the Tracker store: %s",
error ? error->message : "unknown error");
g_clear_error (&error);
return 1;
}
/* Run a synchronous update query */
<code class="function"><a class="link" href="TrackerSparqlConnection.html#tracker-sparql-connection-update" title="tracker_sparql_connection_update ()">tracker_sparql_connection_update</a></code> (connection,
query,
G_PRIORITY_DEFAULT,
NULL,
&error);
if (error) {
/* Some error happened performing the query, not good */
g_printerr ("Couldn't update the Tracker store: %s",
error ? error->message : "unknown error");
g_clear_error (&error);
g_object_unref (connection);
return 1;
}
g_object_unref (connection);
return 0;
}
</pre>
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