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<title>Connecting: GNOME Data Access 5 manual</title>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="connections"></a>Connecting</h2></div></div></div>
<p>
<span class="application">Libgda</span> allows data sources (DSN) to be defined and referred to by a unique name which contains all the
required information to actually open a connection (except the name and password if they are required);
see the <a class="link" href="libgda-5.0-Configuration.html" title="Configuration">Configuration section</a> for more information about
how to manage data sources. Of
course it's still possible to open a connection without having defined a DSN, in which case a <span class="emphasis"><em>connection
string</em></span> is used to specify all the parameters required to open a connection. For more information
about connection strings, see the <a class="link" href="GdaConnection.html#gda-connection-open-from-string" title="gda_connection_open_from_string ()">gda_connection_open_from_string ()</a>'s documentation.
</p>
<p>
Connections are opened using <a class="link" href="GdaConnection.html#gda-connection-open-from-dsn" title="gda_connection_open_from_dsn ()">gda_connection_open_from_dsn ()</a> for
connections which are defined as a data source (DSN), or
or <a class="link" href="GdaConnection.html#gda-connection-open-from-string" title="gda_connection_open_from_string ()">gda_connection_open_from_string ()</a> otherwise.
Each connection object can then be used to actually execute queries, for example:
</p>
<pre class="programlisting">
void
do_stuff () {
GdaConnection *connection;
/* open a connection */
g_print ("CONNECTING\n");
connection = gda_connection_open_from_dsn ("calvaris", NULL,
GDA_CONNECTION_OPTIONS_READ_ONLY, NULL);
if (!connection) {
g_print ("CONNECTION FAILED\n");
return;
}
g_print ("CONNECTED\n");
/* use the connection */
execute_some_queries (connection);
/* close the connection */
g_object_unref (G_OBJECT (connection));
}
</pre>
<p>
</p>
<p>
Closing the connection can be ordered using <a class="link" href="GdaConnection.html#gda-connection-close" title="gda_connection_close ()">gda_connection_close ()</a>,
or is automatically done when the connection object is destroyed (as is the case in the example above when
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref()</a> is called with the connection as argument).
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