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<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).
    </p>
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