Oracle Advanced Queuing 之03(订阅&通知)

Posted 2020-12-20 轻飘飘D

1.創建隊列及隊列表且启动之 aq_admin login

begin
  --Create a table for queues 
  dbms_aqadm.create_queue_table (queue_table=>‘aq_msg_qtab2‘,queue_payload_type=>‘AQ_ADMIN.AQ_MSG_TYPE‘,multiple_consumers => true);

  --Create a test queue
  dbms_aqadm.create_queue (queue_name  => ‘aq_msg_queue2‘, queue_table => ‘aq_msg_qtab2‘);
                           
  --Start the queue                           
  dbms_aqadm.start_queue (queue_name => ‘aq_msg_queue2‘);      
end;
/

begin
 dbms_aqadm.grant_queue_privilege (privilege => ‘ALL‘,queue_name => ‘AQ_ADMIN.AQ_MSG_QUEUE2‘,grantee => ‘AQ_USER‘,grant_option => FALSE);
end;

2.创建订阅&注册回调(回调过程的创建参照上节) aq_admin login

begin  
  -- Configure the demo subscriber.
  dbms_aqadm.add_subscriber (queue_name => ‘aq_msg_queue2‘,subscriber => sys.aq$_agent(name => ‘subscriber_xag‘,address  => null,protocol => 0));
                                                         
  -- Register the procedure for dequeuing the messages received.
  dbms_aq.register(
    sys.aq$_reg_info_list(
      sys.aq$_reg_info(‘AQ_ADMIN.AQ_MSG_QUEUE2:SUBSCRIBER_XAG‘,dbms_aq.namespace_aq, 
                       ‘plsql://AQ_USER.CALL_BACK_PCK.AQ_MSG_QUEUE1‘,hextoraw(‘FF‘))
                      ),
      1);
end;
/

3.入队 aq_user login

select count(1) from aq_admin.aq_msg_qtab2;
-------------------------------------------------------
0

declare
  v_queue_name varchar2(50);
  v_enqueue_options     dbms_aq.enqueue_options_t;
  v_message_properties  dbms_aq.message_properties_t;
  v_message_handle      raw(16);
  v_aq_msg              aq_admin.aq_msg_type;
begin
  v_queue_name:=‘aq_admin.aq_msg_queue2‘;
  v_aq_msg := aq_admin.aq_msg_type (3,‘none‘,‘none‘,‘a‘,‘content 3‘,sysdate);
  dbms_aq.enqueue(queue_name => v_queue_name,enqueue_options => v_enqueue_options,message_properties => v_message_properties,payload => v_aq_msg,msgid => v_message_handle);
  commit;
end;

select count(1) from aq_admin.aq_msg_qtab2;
-------------------------------------------------------
0

4.验证回调结果

select t.queue_name,t.received_time,t.consumer_name,t.content.msg_content,t.content.msg_create_time  
from aq_msg_received t where ‘content 3‘=t.content.msg_content
-----------------------------------------------------------------------------------
QUEUE_NAME	                RECEIVED_TIME	    CONSUMER_NAME	CONTENT.MSG_CONTENT	CONTENT.MSG_CREATE_TIME
"AQ_ADMIN"."AQ_MSG_QUEUE2"	2020/11/11 23:16:38	SUBSCRIBER_XAG	content 3	        2020/11/11 23:16:38