Advanced Queuing - Oracle

General Features of Advanced Queuing
source.user_data.ordertype,
source.user_data.orderregion,
WS.get_customer_info(source.user_data.custno),
source.user_data.paymentmethod,
source.user_data.items,
source.user_data.ccnumber,
source.user_data.order_date)');
In the BooksOnline application, assume that the Overseas Shipping site
represents the order as an XMLType payload. The Order Entry site represents
the order as an Oracle object, ORDER_TYP. Since the Overseas Shipping site
subscribes to messages in the OE_BOOKEDORDERS_QUE queue, a transformation
is applied before messages are propagated from the Order Entry site to the
Overseas Shipping site.
The transformation is defined as follows:
CREATE OR REPLACE FUNCTION CONVERT_TO_ORDER_XML(input_order TYPE OE.ORDER_
TYP)
RETURN SYS.XMLType AS
new_order SYS.XMLType;
BEGIN
select SYS_XMLGEN(input_order) into new_order from dual;
RETURN new_order;
END CONVERT_TO_ORDER_XML;
execute dbms_transform.create_transformation(
schema => 'OS',
name => 'OE2XML',
from_schema => 'OE',
from_type => 'ORDER_TYP',
to_schema => 'SYS',
to_type => 'XMLTYPE',
transformation => 'CONVERT_TO_ORDER_XML(source.user_data)');
/* Add a rule-based subscriber for Overseas Shipping to the Booked orders
queues with Transformation. Overseas Shipping handles all non-US orders: */
DECLARE
subscriber aq$_agent;
BEGIN
subscriber := aq$_agent('Overseas_Shipping','OS.OS_bookedorders_que',null);
dbms_aqadm.add_subscriber(
queue_name => 'OE.OE_bookedorders_que',
A Sample Application Using AQ 8-9