Doubt regarding using variable in deq_condition (Queues)

Question

I am using Oracle 11g in Linux Platform .
I am trying to dequeue a message based on a condition and the condition involves a variable .
         DECLARE
                l_enqueue_options               DBMS_AQ.enqueue_options_t;
                l_dequeue_options          DBMS_AQ.dequeue_options_t;
                l_message_properties    DBMS_AQ.message_properties_t;
                l_message_handle        RAW(16);
                l_event_msg             event_msg_type;
                worker_status           VARCHAR2(30)    :=      NULL;
                worker_no                       NUMBER;
        BEGIN
                SELECT worker_no_seq.nextval INTO worker_no FROM DUAL;
                l_event_msg := event_msg_type(worker_no, 'Hi', 'NEW', systimestamp, NULL);
                DBMS_AQ.enqueue(queue_name          => 'event_queue',
                                enqueue_options     => l_enqueue_options,
                                message_properties  => l_message_properties,
                                payload             => l_event_msg,
                                msgid               => l_message_handle);
                COMMIT;
                l_dequeue_options.deq_condition     := 'tab.user_data.worker_id = :worker_no AND tab.user_data.status=''DONE''';
          DBMS_AQ.dequeue(queue_name          => 'event_queue',
                    dequeue_options     => l_dequeue_options,
                    message_properties  => l_message_properties,
                    payload             => l_event_msg,
                    msgid               => l_message_handle);
          COMMIT
        END;Here I am en-queuing a message which is dequeued by another procedure and some calculations are done based on the message and the message is enqueued back with same worker_id and status is updated as DONE . Now the code given above is a blocking call to dequeue the message with same worker_id and with status as 'DONE' . But since the condition involves a variable I am getting an error
ERROR at line 1:
ORA-01008: not all variables bound
ORA-06512: at "SYS.DBMS_AQ", line 335Let me know what should be done ?

Answer 1

The open_cursors value was set to default one ...50
I did try executing the same after setting it to 200 ...It ran fine
But I am not using any explicit cursor inside .
I am not very sure of what enqueue and dequeue procedures in DBMS_AQ do ...
The first and second procedures are as follows
        FUNCTION execute_task(worker_no NUMBER) RETURN VARCHAR2
     IS
          l_enqueue_options     DBMS_AQ.enqueue_options_t;
          l_dequeue_options          DBMS_AQ.dequeue_options_t;
          l_message_properties       DBMS_AQ.message_properties_t;
          l_message_handle           RAW(16);
          l_event_msg                event_msg_type;
     BEGIN
          l_event_msg := event_msg_type(worker_no, 'Hi', 'NEW', systimestamp, NULL);
          DBMS_AQ.enqueue(queue_name          => 'event_queue',       
                    enqueue_options     => l_enqueue_options,    
                    message_properties  => l_message_properties,  
                    payload             => l_event_msg,            
                    msgid               => l_message_handle);
          COMMIT;
          l_dequeue_options.deq_condition     := 'tab.user_data.worker_id = '||worker_no||' AND tab.user_data.status = ''DONE''';
          DB MS_AQ.dequeue(queue_name          => 'event_queue',
                    dequeue_options     => l_dequeue_options,
                    message_properties  => l_message_properties,
                    payload             => l_event_msg,
                    msgid               => l_message_handle);
          COMMIT;
          RETURN l_event_msg.status;
     END;
        PROCEDURE get_a_task(worker_no NUMBER)
     IS
          l_enqueue_options     DBMS_AQ.enqueue_options_t;
          l_dequeue_options          DBMS_AQ.dequeue_options_t;
          l_message_properties       DBMS_AQ.message_properties_t;
          l_message_handle           RAW(16);
          l_event_msg                event_msg_type;
     BEGIN
          l_dequeue_options.deq_condition     := 'tab.user_data.worker_id = '||worker_no||' AND tab.user_data.status = ''NEW''';
          DBMS_AQ.dequeue(queue_name          => 'event_queue',
                    dequeue_options     => l_dequeue_options,
                    message_properties  => l_message_properties,
                    payload             => l_event_msg,
                    msgid               => l_message_handle);
          COMMIT;
          l_event_msg := event_msg_type(l_event_msg.worker_id, l_event_msg.information, 'DONE', l_event_msg.start_time, systimestamp);
          DBMS_AQ.enqueue(queue_name          => 'event_queue',       
                    enqueue_options     => l_enqueue_options,    
                    message_properties  => l_message_properties,  
                    payload             => l_event_msg,            
                    msgid               => l_message_handle);
          COMMIT;
     END;Let me know if I have to do any changes to the code .
Message was edited by:
user558969