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 /**
     * Displays last SQL error.
     *
     * @param string|bool $sql
     *
     * @throws PrestaShopDatabaseException
     */
    public function displayError($sql = false)
    {
        global $webservice_call;

        $errno = $this->getNumberError();
        if ($webservice_call && $errno) {
            $dbg = debug_backtrace();
            WebserviceRequest::getInstance()->setError(500, '[SQL Error] ' . $this->getMsgError() . '. From ' . (isset($dbg[3]['class']) ? $dbg[3]['class'] : '') . '->' . $dbg[3]['function'] . '() Query was : ' . $sql, 97);
        } elseif (_PS_DEBUG_SQL_ && $errno && !defined('PS_INSTALLATION_IN_PROGRESS')) {
            if ($sql) {
                throw new PrestaShopDatabaseException($this->getMsgError() . '<br /><br /><pre>' . $sql . '</pre>');    /*LA LIGNE 769 dans DB.php */
            }

            throw new PrestaShopDatabaseException($this->getMsgError());
        }
    }