How to add a prefix to an order number

Question

How can i add a prefix to all future order numbers in Magento 1.9.01? I've tried the Database solution described here:

http://www.warpconduit.net/2012/04/18/how-to-change-the-order-increment-id-and-prefix-in-magento

But this has no effect. New orders have no prefix.

Answer 1

Have you tried to rewrite class Mage_Eav_Model_Entity_Type and add your custom order numbers logic in the method fetchNewIncrementId?

Like

public function fetchNewIncrementId($storeId = null)
{
    $incrementId = parent::fetchNewIncrementId($storeId); 

    $incrementId = 'prefix' . $incrementId;

    return $incrementId;
}