Wordpress中的MySQL

So, second part.

I now got the data for the mysql database but everytime I include a mysql function in the wordpress HTML editor (with exec-php enabled) the site is empty (except for the standard design and the title of the site in the tab is "Site not found" when before everything worked great.

Any idea? What is WordPress problem?

    if(isset ($_POST['name']))
    {
        if($_POST['name'] == "" || $_POST['adresse1'] == "" || $_POST['adresse2'] == "" || $_POST['land'] == "" || $_POST['tel'] == "" || $_POST['email'] == "" || $_POST['interessen'] == "")
        {
            echo "Mindestens eine Angabe fehlt leider.";

echo "<br/><br/><a href=\"javascript:history.back()\">Zurück</a>";
        }
        else
        {
            mysql_connect("xx","xx","xx") or die(mysql_error());
        }
    }

This is my code, $_POST works okay and the form is also shown. But when I try to use a mysql_connect it loads no text and don't give an error report too. And the title in the tab bar changes to "Site not found". But with phpmyadmin i can access the database.

Enable wordpress debug-mode and look at your error-log. To enable debug-mode, put the following into your wp-config.php:

/** Debugging WP */
define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', true);
define('WP_DEBUG_LOG', true);
define('SCRIPT_DEBUG', true);

Additionally look at the error-log of your webserver.