/**
* @return mixed The primary key value(s), as an associative array if the
* key is compound, or a scalar if the key is single-column
*/
protected final function _doUpdate()
{
/// A read-only row cannot be saved.
$this->checkReadOnly();
/// Run pre-UPDATE logic
$this->_update();
if (count($this->_errors)) {
throw new Zend_Db_Table_Row_Exception('This row contain errors.');
}
return parent::_doUpdate();
}