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<title>Tracker SPARQL Library Reference Manual: SPARQL query builder</title>
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<div class="titlepage"><div><div><h2 class="title">
<a name="tracker-examples-builder"></a>SPARQL query builder</h2></div></div></div>
<p>
      The Tracker SPARQL library provides an easy and secure way of creating
      SPARQL queries with the proper syntax. This is achieved using the
      <span class="type"><a class="link" href="TrackerSparqlBuilder.html#TrackerSparqlBuilder-struct" title="struct TrackerSparqlBuilder">TrackerSparqlBuilder</a></span>
      object.
    </p>
<p>
</p>
<pre class="programlisting">
#include &lt;tracker-sparql.h&gt;

int main (int argc, char **argv)
{
  <span class="type"><a class="link" href="TrackerSparqlBuilder.html#TrackerSparqlBuilder-struct" title="struct TrackerSparqlBuilder">TrackerSparqlBuilder</a></span> *builder;
  const gchar *iri = "urn:example:0001";
  const gchar *query_str;
  time_t now;

  /* Create builder */
  builder = <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-new-update" title="tracker_sparql_builder_new_update ()">tracker_sparql_builder_new_update</a></code> ();

  /* Insert new data */
  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-insert-open" title="tracker_sparql_builder_insert_open ()">tracker_sparql_builder_insert_open</a></code> (builder, NULL);

  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-subject-iri" title="tracker_sparql_builder_subject_iri ()">tracker_sparql_builder_subject_iri</a></code> (builder, iri);

  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-predicate" title="tracker_sparql_builder_predicate ()">tracker_sparql_builder_predicate</a></code> (builder, "a");
  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-object" title="tracker_sparql_builder_object ()">tracker_sparql_builder_object</a></code> (builder, "nie:DataObject");
  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-object" title="tracker_sparql_builder_object ()">tracker_sparql_builder_object</a></code> (builder, "nfo:FileDataObject");

  now = time (NULL);
  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-predicate" title="tracker_sparql_builder_predicate ()">tracker_sparql_builder_predicate</a></code> (builder, "nfo:fileLastModified");
  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-object-date" title="tracker_sparql_builder_object_date ()">tracker_sparql_builder_object_date</a></code> (builder, &amp;now);

  <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-insert-close" title="tracker_sparql_builder_insert_close ()">tracker_sparql_builder_insert_close</a></code> (builder);

  /* Get query as string. Do NOT g_free() the resulting string! */
  query_str = <code class="function"><a class="link" href="TrackerSparqlBuilder.html#tracker-sparql-builder-get-result" title="tracker_sparql_builder_get_result ()">tracker_sparql_builder_get_result</a></code> (builder);

  /* Print it */
  g_print ("Generated SPARQL query: '%s'\n", query_str);

  /* Once builder no longer needed, unref it. Note that after
   * this operation, you must not use the returned query result
   * any more
   */
  g_object_unref (builder);

  return 0;
}
</pre>
<p>

      The previous code will generate the following SPARQL query:
</p>
<pre class="programlisting">
  DROP GRAPH &lt;urn:example:0001&gt;
  INSERT INTO &lt;urn:example:0001&gt; {
    &lt;urn:example:0001&gt; a nie:DataObject , nfo:FileDataObject ;
                       nfo:fileLastModified "2010-08-04T13:09:26Z" .
}
</pre>
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