--演示环境
scott@CNMMBO> select * from v$version where rownum<2;
BANNER
----------------------------------------------------------------
Oracle Database 10g Release 10.2.0.3.0 - 64bit Production
--创建演示表及序列
CREATE TABLE tb_schduler
(
id NUMBER (10) NOT NULL,
descr VARCHAR2 (20) NOT NULL,
cr_date DATE NOT NULL,
CONSTRAINT tb_schduler_pk PRIMARY KEY (id)
);
CREATE SEQUENCE tb_schduler_seq;
1、创建程序
--下面定义了3个需要用到的程序program，注意这里的program不等同于procedure或者package，但是可以调用procedure或package
--下面的program主要是用于插入记录到测试表
BEGIN
DBMS_SCHEDULER.create_program (
program_name => 'test_proc_1',
program_type => 'PLSQL_BLOCK', -->这里的类型定义为PLSQL_BLOCK，支持STORED PROCEDURE/EXECUTEABLE
program_action => 'BEGIN
INSERT INTO tb_schduler (id, descr, cr_date)
VALUES (tb_schduler_seq.NEXTVAL, ''test_proc_1'', SYSDATE);
COMMIT;
END;',
enabled => TRUE,
comments => 'Program for first link in the chain.');
DBMS_SCHEDULER.create_program (
program_name => 'test_proc_2',
program_type => 'PLSQL_BLOCK',
program_action => 'BEGIN
INSERT INTO tb_schduler (id, descr, cr_date)
VALUES (tb_schduler_seq.NEXTVAL, ''test_proc_2'', SYSDATE);
COMMIT;
END;',
enabled => TRUE,
comments => 'Program for second link in the chain.');
DBMS_SCHEDULER.create_program (
program_name => 'test_proc_3',
program_type => 'PLSQL_BLOCK',
program_action => 'BEGIN
INSERT INTO tb_schduler (id, descr, cr_date)
VALUES (tb_schduler_seq.NEXTVAL, ''test_proc_3'', SYSDATE);
COMMIT;
END;',
enabled => TRUE,
comments => 'Program for last link in the chain.');
END;
/
2、创建chain
--创建chain比较简单，通常只需要定义一个chain名字即可，主要是用于关联后续定义rule及step
BEGIN
DBMS_SCHEDULER.create_chain (
chain_name => 'test_chain_1', -->定义chain的名字
rule_set_name => NULL, -->可以指定规则集的名字
evaluation_interval => NULL,
comments => 'A test chain.');
END;
/
3、定义chain步骤
--下面定义chain的每一个步骤以及其对应的program_name，也就是每一步需要做什么
BEGIN
DBMS_SCHEDULER.define_chain_step (
chain_name => 'test_chain_1', --->chain的名字
step_name => 'chain_step_1', --->步骤地名字
program_name => 'test_proc_1'); --->当前步骤应执行的相应程序
DBMS_SCHEDULER.define_chain_step (
chain_name => 'test_chain_1',
step_name => 'chain_step_2',
program_name => 'test_proc_2');
DBMS_SCHEDULER.define_chain_step (
chain_name => 'test_chain_1',
step_name => 'chain_step_3',
program_name => 'test_proc_3');
END;
/
4、定义chain规则
--用于定义chain根据执行结果应该如何跳转的问题，每个CHAIN 规则都拥有condition和action 属性，
--当满足condition 时则执行action中指定的step。使用DBMS_SCHEDULER.DEFINE_CHAIN_RULE 过程
BEGIN
DBMS_SCHEDULER.define_chain_rule (
chain_name => 'test_chain_1',
condition => 'TRUE',
action => 'START "CHAIN_STEP_1"',
rule_name => 'chain_rule_1',
comments => 'First link in the chain.');
DBMS_SCHEDULER.define_chain_rule (
chain_name => 'test_chain_1',
condition => '"CHAIN_STEP_1" COMPLETED',
action => 'START "CHAIN_STEP_2"',
rule_name => 'chain_rule_2',
comments => 'Second link in the chain.');
DBMS_SCHEDULER.define_chain_rule (
chain_name => 'test_chain_1',
condition => '"CHAIN_STEP_2" COMPLETED',
action => 'START "CHAIN_STEP_3"',
rule_name => 'chain_rule_3',
comments => 'Third link in the chain.');
DBMS_SCHEDULER.define_chain_rule (
chain_name => 'test_chain_1',
condition => '"CHAIN_STEP_3" COMPLETED',
action => 'END',
rule_name => 'chain_rule_4',
comments => 'End of the chain.');
END;
/
5、激活chain
BEGIN
DBMS_SCHEDULER.enable ('test_chain_1');
END;
/
6、将chain添加到job
BEGIN
DBMS_SCHEDULER.CREATE_JOB (
job_name => 'test_chain_1_job',
job_type => 'CHAIN',
job_action => 'test_chain_1',
repeat_interval => 'freq=minutely; interval=2',
start_date => SYSTIMESTAMP,
end_date => SYSTIMESTAMP + (1/48),
enabled => FALSE); --->值为TRUE用于激活JOB
END;
/
7、手动执行chain
BEGIN
DBMS_SCHEDULER.run_chain (
chain_name => 'test_chain_1',
job_name => 'test_chain_1_run_job',
start_steps => 'chain_step_1,chain_step_3'); -->可以指定单步或多步以及所有步骤
END;
/
scott@CNMMBO> select * from tb_schduler;
ID DESCR CR_DATE
---------- -------------------- -----------------
1 test_proc_1 20131203 14:36:03
2 test_proc_3 20131203 14:36:04
--激活job
scott@CNMMBO> exec dbms_scheduler.enable('test_chain_1_job');
PL/SQL procedure successfully completed.
