Advanced Queuing - Oracle

Posting for Subscriber Notification
Usage Notes
Several subscriptions can be posted to at one time. Posting to a subscription
involves identifying the subscription name and the payload, if desired. It is possible
for no payload to be associated with this call. This call provides a best-effort
guarantee. A notification goes to registered clients at most once.
This call is primarily used for lightweight notification and is useful in the case of
several system events. If an application needs more rigid guarantees, it can use AQ
functionality by enqueuing to a queue.
When using OCI, the user must specify a subscription handle at registration time
with the namespace attribute set to OCI_SUBSCR_NAMESPACE_ANONYMOUS.
When using PL/SQL, the namespace attribute in aq$_post_info must be set to
DBMS_AQ.NAMESPACE_ANONYMOUS.
Related functions: LNOCIAQListen(), OCISvcCtxToLda(),
LNOCISubscriptionEnable(), OCISubscriptionRegister(),
LNOCISubscriptionUnRegister(), dbms_aq.register, dbms_
aq.unregister.
Syntax
See Chapter 3, "AQ Programmatic Environments" for a list of available functions in
each programmatic environment. Use the following syntax references for each
programmatic environment:
PL/SQL (DBMS_AQ Package): POST procedure.
C (OCI): Oracle Call Interface Programmer’s Guide LNOCI Programming
Advanced Topics, Publish-Subscribe Notification
Visual Basic (OO4O) (Oracle Objects for OLE (OO4O) Online Help): Not
supported.
Java (JDBC): Not supported.
Examples
See Chapter 3, "AQ Programmatic Environments" for a list of available functions in
each programmatic environment.
PL/SQL (DBMS_AQ Package): Post of Object-Type Messages
-- Register for notification
DECLARE
reginfo sys.aq$_reg_info;
Operational Interface: Basic Operations 11-67