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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 &lt;tracker-sparql.h&gt;

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, &amp;error);
  if (!connection) {
    g_printerr ("Couldn't obtain a connection to the Tracker store: %s",
                error ? error-&gt;message : "unknown error");
    g_clear_error (&amp;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,
                                            &amp;error);
  if (error) {
    /* Some error happened performing the query, not good */
    g_printerr ("Couldn't update the Tracker store: %s",
                error ? error-&gt;message : "unknown error");

    g_clear_error (&amp;error);
    g_object_unref (connection);

    return 1;
  }

  g_object_unref (connection);

  return 0;
}
</pre>
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