Problem with storing data into Data base

[G.Venkata Phanindra]

Hi,
    I am trying to add an entry into one of the table Named OrderHeaderExt
i am writting the following lines of code but the data is not getting stored
into data base.what is that iam doing worng in the following lines of code.
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String deliveryDate = "22/Sep/2006";
           Date deliveryDateValue = df.parse(deliveryDate);
           Timestamp deliveryDateTimestamp = new Timestamp(
deliveryDateValue.getTime());
           GenericValue orderHeaderExt = delegator.makeValue("OrderHeaderExt",
UtilMisc.toMap("orderId", orderId, "deliveryDate", deliveryDateTimestamp));
           try {
               orderHeaderExt.store();
           } catch (GenericEntityException e) {
               e.printStackTrace();
           }

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G.Venkata Phanindra
Mob:: 9849852989