Advanced Queuing - Oracle

Converting Messages
Propagating Inbound XML Messages: Example
This example sets up propagation to move book orders, which are XML documents
conforming to the XML schema associated with the PL/SQL type book_order_
typ, from the foreign queue, FQ_book_orders, to the AQ queue, AQ_book_
orders. Users should use the package DBMS_XMLSCHEMA to generate XML schema
from the ADT book_order_typ to generate valid XML book order messages.
The following script defines a function and a transformation to convert a book
order in the form of an XML document stored in an object of the canonical type
sys.mgw_basic_msg_t to an object of ADT book_order_typ. Run the script as
mgwuser.
-- create a transformation function
CREATE OR REPLACE FUNCTION fnc_basic2order(basic IN sys.mgw_basic_msg_t)
RETURN book_order_typ
IS
v_xml XMLType;
v_text varchar(2000); -- assume book orders in XML document
-- are less than 2000 char
long
v_order book_order_typ;
BEGIN
v_text := basic.text_body.small_value;
/
v_xml := XMLType.createXML(v_text);
v_xml.toObject(v_order);
return v_order;
END fnc_basic2order;
-- grant execute privilege to PUBLIC in order for the agent to be able to call
it
GRANT EXECUTE on fnc_basic2order to PUBLIC;
-- create a transformation with the function
BEGIN
dbms_transform.create_transformation(
schema => ‘mgwuser’,
name => ‘basic2order’,
from_schema => ‘sys’,
from_type => ‘mgw_basic_msg_t’,
to_schema => ‘mgwuser’,
Messaging Gateway 18-43