PHP with Oracle AQ

Create PL/SQL Procedure to Dequeue Message

Similar to the enq procedure we will now create a procedure named deq to Dequeue a message from the salary_review queue. The deq procedure uses the DEQUEUE procedure in DBMS_AQ package to dequeue a message and the payload from that message is assigned to two OUT parameters empid and incr.

CREATE OR REPLACE PROCEDURE deq(empid out number, incr out number) AS
  dequeue_options    dbms_aq.dequeue_options_t;
  message_properties dbms_aq.message_properties_t;
  emp_sal       salary_review;
  enq_id        raw(16);
BEGIN
  dequeue_options.wait := 0;
  DBMS_AQ.DEQUEUE(queue_name         => 'hr.salary_review_queue',
                  dequeue_options    => dequeue_options,
                  message_properties => message_properties,
                  payload            => emp_sal,
                  msgid              => enq_id);
  empid := emp_sal.empid;
  incr := emp_sal.incr;
  COMMIT;
END; 

To test the above procedure, run:

SET SERVEROUTPUT ON;
  DECLARE
   empid number(6);
   incr number(2);
  BEGIN
 	deq(empid, incr);
 	DBMS_OUTPUT.PUT_LINE('Employee ID :' || empid);
  	DBMS_OUTPUT.PUT_LINE('Increment :' || incr);
  EXCEPTION
  WHEN OTHERS THEN
      IF sqlcode = -25228 THEN
        DBMS_OUTPUT.PUT_LINE('No more messages in queue');
      END IF;
  END;


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