Magento: insert or update (if already exists) row in DB

gistfile1.php

    protected function _insertOrUpdateData(&$dbAdapter, $table, $data, $where)
    {
        $select = $dbAdapter->select()->from($table);
        foreach ($where as $condition => $value) 
        {
            $select->where($condition, $value);
        }

        if ($dbAdapter->fetchOne($select))
        {
            $dbAdapter->update($table, $data, $where);
        }
        else
        {
            $dbAdapter->insert($table, $data, $where);
        }
    }