/**
* Construct a new SQL storage object.
*
* @param string $notepad The name of the notepad to load/save notes from.
* @param array $params The connection parameters
*
* @throws InvalidArguementException
*/
public function __construct($notepad, $params = array())
{
if (empty($params['db'])) {
throw new InvalidArgumentException('Missing required connection parameter.');
}
$this->_notepad = $notepad;
$this->_db = $params['db'];
$this->_charset = $params['charset'];
$this->_column = $this->_db->column('mnemo_memos', 'memo_body');
}