/usr/share/gtk-doc/html/libtracker-sparql/tracker-examples-writeonly.html is in libtracker-sparql-doc 1.6.2-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Updating the Store: Tracker SPARQL Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="Tracker SPARQL Library Reference Manual">
<link rel="up" href="tracker-examples.html" title="Part III. Examples">
<link rel="prev" href="tracker-examples-readonly.html" title="Querying the Store">
<link rel="next" href="tracker-examples-writeonly-with-blank-nodes.html" title="Updating the Store with Blank Nodes">
<meta name="generator" content="GTK-Doc V1.25 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts"></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="tracker-examples.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="tracker-examples-readonly.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="tracker-examples-writeonly-with-blank-nodes.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<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>
<p>
</p>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.25</div>
</body>
</html>
|