protected function _checkRequiredOptions(array $config)
{
// we need at least a dbname
if (!array_key_exists('dbname', $config)) {
/** @see Zend_Db_Adapter_Exception */
require_once 'Zend/Db/Adapter/Exception.php';
throw new Zend_Db_Adapter_Exception("Configuration array must have a key for 'dbname' that names the database instance");
}
}