Wordpress insert data into custom database

gistfile1.txt

/**
 * Insert LinkUrl to wp_imported_articles table
 *
 * @param $LinkUrl
 * @return int
 */
function topgear_save_LinkUrl_todatabase($LinkUrl)
{
    global $wpdb;

    $success = $wpdb->insert("{$wpdb->base_prefix}imported_articles", array(
        "LinkUrl" => $LinkUrl
    ));

    return $success;
}