Advanced Queuing - Oracle

General Features of Advanced Queuing
You can also create payloads that contain Oracle objects with XMLType attributes.
These can be used for transmitting and storing messages that contain XML
documents. By defining Oracle objects with XMLType attributes, you can do the
following:
Store more than one type of XML document in the same queue. The documents
are stored internally as CLOBs.
Query XMLType attributes using the operators XMLType.existsNode(),
XMLType.extract(), and so on.
PL/SQL (DBMS_AQADM Package): Scenario and Code
The BooksOnLine application uses a rich set of data types to model book orders as
message content.
Customers are modeled as an object type called customer_typ.
CREATE OR REPLACE TYPE customer_typ AS OBJECT (
custno NUMBER,
name VARCHAR2(100),
street VARCHAR2(100),
city VARCHAR2(30),
state VARCHAR2(2),
zip NUMBER,
country VARCHAR2(100));
Books are modeled as an object type called book_typ.
CREATE OR REPLACE TYPE book_typ AS OBJECT (
title VARCHAR2(100),
authors VARCHAR2(100),
ISBN NUMBER,
price NUMBER);
An order item that represents an order line item is modeled as an object type
called orderitem_typ. An order item is a nested type that includes the book
type.
CREATE OR REPLACE TYPE orderitem_typ AS OBJECT (
quantity NUMBER,
item BOOK_TYP,
subtotal NUMBER);
An order item list is used to represent a list of order line items and is modeled
as a varray of order items;
8-12 Oracle9i Application Developer’s Guide - Advanced Queuing