更新时间:2024-11-01 GMT+08:00
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Package支持自治事务

自治事务可以在package中的存储过程或者函数中定义,标识符为PRAGMA AUTONOMOUS_TRANSACTION,其余语法与创建package中存储过程或函数语法相同,示例如下。

--建表
drop table t2;
create table t2(a int, b int);
insert into t2 values(1,2);
select * from t2;

--创建包含自治事务的package中的存储过程和函数
CREATE OR REPLACE PACKAGE autonomous_pkg AS
  PROCEDURE autonomous_4(a int, b int);
  FUNCTION autonomous_32(a int ,b int) RETURN int;
END autonomous_pkg;
/
CREATE OR REPLACE PACKAGE body autonomous_pkg AS
PROCEDURE autonomous_4(a int, b int)  AS 
DECLARE 
 num3 int := a;
 num4 int := b;
 PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
	insert into t2 values(num3, num4); 
END;
FUNCTION autonomous_32(a int ,b int) RETURN int AS 
DECLARE 
	PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
	insert into t2 values(a, b);
	return 1;
END;
END autonomous_pkg;
/
--创建调用package自治事务存储过程和函数的普通存储过程
CREATE OR REPLACE PROCEDURE autonomous_5(a int, b int)  AS 
DECLARE
va int;
BEGIN
	insert into t2 values(666, 666);
	autonomous_pkg.autonomous_4(a,b);
        va := autonomous_pkg.autonomous_32(a + 1, b + 1);
	rollback;
END;
/
--调用普通存储过程
select autonomous_5(11,22);
--查看表结果
select * from t2 order by a;

上述例子,最后在回滚的事务块中执行包含package自治事务的存储过程和函数,直接说明了自治事务的特性,即主事务的回滚,不会影响自治事务已经提交的内容。

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