云数据库 GaussDB-Package支持自治事务

时间:2025-02-12 15:08:37

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gaussdb=# drop table if exists t2;gaussdb=# create table t2(a int, b int);CREATE TABLEgaussdb=# insert into t2 values(1,2);INSERT 0 1gaussdb=# select * from t2; a | b---+--- 1 | 2(1 row)--创建包含自治事务的package中的存储过程和函数gaussdb=# 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 PACKAGEgaussdb=# CREATE OR REPLACE PACKAGE body autonomous_pkg ASPROCEDURE autonomous_4(a int, b int)  AS DECLARE  num3 int := a; num4 int := b; PRAGMA AUTONOMOUS_TRANSACTION;BEGINinsert into t2 values(num3, num4); END;FUNCTION autonomous_32(a int ,b int) RETURN int AS DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGINinsert into t2 values(a, b);return 1;END;END autonomous_pkg;/CREATE PACKAGE BODY--创建调用package自治事务存储过程和函数的普通存储过程gaussdb=# CREATE OR REPLACE PROCEDURE autonomous_5(a int, b int)  AS DECLAREva int;BEGINinsert into t2 values(666, 666);autonomous_pkg.autonomous_4(a,b);        va := autonomous_pkg.autonomous_32(a + 1, b + 1);rollback;END;/CREATE PROCEDURE--调用普通存储过程gaussdb=# select autonomous_5(11,22); autonomous_5--------------(1 row)--查看表结果gaussdb=# select * from t2 order by a; a  | b----+----  1 |  2 11 | 22 12 | 23(3 rows)

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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