public function getContentByIds(array $identifiers)
    {
        $sql = sprintf(
            'SELECT * FROM %s WHERE entityId IN (`%s`);',
            $this->mysql->quote($this->section),
            implode('`,`', $identifiers)
        );
        $result = $this->mysql->query($sql);

        if (false === $result) {

            $this->throwException(
                'Error occurred while querying the registry: ',
                $this->mysql->errorInfo()
            );
        }

        $content = $result->fetchAll(\PDO::FETCH_ASSOC);
        $this->registry[$this->section] = array_merge($this->registry[$this->section], $content);

        return $content;
    }