Oracle Advanced queue ,Step by Step

 

Oracle AQ Demo，Step by Step
我准备用AQ来做一个数据仓库系统，提交分析任务队列。有以下需求：
1.利用通知异步的执行存储过程
2.设定队列大小极限
3.出列即删除
OK，let's go for it
step 1:创建用户
--create user
-- Create the user
create user PHS
identified by ""
default tablespace PHSDATA
temporary tablespace TEMP
profile DEFAULT;
-- 赋予AQ管理权限
grant execute on DBMS_AQ to PHS;
grant execute on DBMS_AQ_BQVIEW to PHS;
grant execute on Dbms_Aqadm to PHS;
-- Grant/Revoke role privileges
grant connect to PHS;
grant resource to PHS;
-- Grant/Revoke system privileges
grant create procedure to PHS;
grant create table to PHS;
grant create view to PHS;
grant unlimited tablespace to PHS;
step 2:创建一个队列载体对象，一个没有body的type
create or replace type task_c as object
(
-- Author : WANGWJ
-- Created : 2008-1-8 16:00:14
-- Purpose : infomation carrier for analyse Clone-PHS

-- Attributes 业务逻辑相关
begindate DATE,
enddate   DATE,
area   VARCHAR2(12),
taskid   NUMBER,
phscodex VARCHAR2(20)

-- Member functions and procedures

)
--创建队列表
begin
-- Call the procedure
sys.dbms_aqadm.create_queue_table(queue_table => 'QT_CLONE',
                queue_payload_type => 'task_c',--这就是我们定义的type
                sort_list => 'priority,enq_time',--按优先级和入列时间排序
                multiple_consumers => TRUE, --多消费者
                comment => 'queue for analyse CLONE-PHS',
                auto_commit => FALSE --手动控制事务--create queue
                );
end;
--创建队列
begin
sys.dbms_aqadm.create_queue(
queue_name => 'q_clone',
queue_table => 'qt_clone',--刚刚建立的queue表
queue_type => sys.dbms_aqadm.normal_queue,
max_retries => 3,--dequeue失败后重试次数
retry_delay => 1,--重试前等待
retention_time => 0 --dequeue后保持时间，不保持
);
end;
step 3:启动队列
execute dbms_aqadm.start_queue('q_clone',true,true);
step 4:创建消息订阅者
SQL> execute dbms_aqadm.add_subscriber ( queue_name => 'q_clone', subscriber => sys.aq$_agent
('analyst',null,null));
PL/SQL procedure successfully completed
SQL>
step 5：入列和出列测试
SQL> --入列
SQL> declare
2 v_Message task_c;
3 v_MsgId RAW(16);
4 v_options DBMS_AQ.ENQUEUE_OPTIONS_T;
5 v_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
6 v_Recipients DBMS_AQ.AQ$_RECIPIENT_LIST_T;
7 begin
8   v_Message:=task_c(begindate => SYSDATE,enddate => SYSDATE-1,area => '028',
9           taskid =>100,phscodex => 'test#$');
10   v_properties.priority := 1; --该消息的优先级别
11   v_options.visibility :=DBMS_AQ.IMMEDIATE;
12   dbms_aq.enqueue(queue_name => 'q_clone',enqueue_options => v_options,message_properties =>
v_properties,payload => v_Message,msgid => v_MsgId);
13   dbms_output.put_line('encode success,msgid is '||v_MsgId);
14
15 end;
16 /
PL/SQL procedure successfully completed
--入列成功
SQL> select t.q_name,t.msgid,t.priority from qt_clone t;
Q_NAME           MSGID               PRIORITY
------------------------------ -------------------------------- ----------
Q_CLONE           7466C75477954808B7E10BC50738845B     1
--改变 v_properties.priority的值为3，2，再入列两次，现在入列的先后顺序为1 3 2，我们希望的出列顺序
--为1 2 3
--出列
declare
v_Message task_c;
v_MsgId RAW(16);
v_options DBMS_AQ.DEQUEUE_OPTIONS_T;
v_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
v_Recipients DBMS_AQ.AQ$_RECIPIENT_LIST_T;
begin
--   v_Recipients(0) := sys.aq$_agent('NOTE','MTQ',0);
--   v_properties.recipient_list := v_Recipients;
v_options.visibility :=DBMS_AQ.IMMEDIATE;
v_options.consumer_name := 'analyst';
dbms_aq.dequeue(queue_name => 'q_clone',dequeue_options => v_options,message_properties =>
v_properties,payload => v_Message,msgid => v_MsgId);
dbms_output.put_line('decode success,msgid is '||v_MsgId);
dbms_output.put_line('subject is '||v_Message.area);
end;
--测试结果略，可以看出出列的顺序 1 2 3
step 6:创建测试过程，并注册通知
创建测试表
-- Create table 用于在接到通知的时候插入一条消息
create table TEST_AQ
(
INFO   VARCHAR2(100),
MESSAGE TASK_C
)
--创建测试过程，插入一条消息，并出列
create or replace procedure plsqlnotif
AS
v_Message task_c;
v_MsgId RAW(16);
v_options DBMS_AQ.DEQUEUE_OPTIONS_T;
v_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
v_Recipients DBMS_AQ.AQ$_RECIPIENT_LIST_T;
BEGIN
v_options.visibility :=DBMS_AQ.IMMEDIATE;
v_options.consumer_name := 'analyst';
dbms_aq.dequeue(queue_name => 'q_clone',dequeue_options => v_options,message_properties =>
v_properties,payload => v_Message,msgid => v_MsgId);
dbms_output.put_line('decode success,msgid is '||v_MsgId);
dbms_output.put_line('subject is '||v_Message.area);
INSERT INTO test_aq VALUES('Get message on ',v_Message);
END;
--注册
declare
reginfolist sys.aq$_reg_info_list;
begin
reginfolist := sys.aq$_reg_info_list(
sys.aq$_reg_info('phs.q_clone:analyst',
  DBMS_AQ.NAMESPACE_AQ,
  'plsql://phs.plsqlnotif', null));
dbms_aq.register(reginfolist, 1);
end;
step 7:测试情况
--入列 略
--接到通知后，插入test表，并出列
SQL> execute plsqlnotif;
decode success,msgid is 59578D93BD55477994D8C9C6B672242B
subject is 028
PL/SQL procedure successfully completed
SQL> select * from test_aq;
INFO                                   MESSAGE
-------------------------------------------------------------------------------- -------
Get message on                              

 

原文：http://valen.blog.ccidnet.com/blog-htm-itemid-233539-do-showone-type-blog-uid-51502.html