云数据库 GAUSSDB-PACKAGE支持自治事务

时间：2024-11-13 14:45:48

云数据库 GAUSSDB 自治事务

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，请参见CREATE PACKAGE。

gaussdb=# create database test DBCOMPATIBILITY = 'ORA';
CREATE DATABASE
test=# \c test
--建表
test=# CREATE TABLE t2(a INT, b INT);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'a' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
test=# INSERT INTO t2 VALUES(1,2);
INSERT 0 1
test=# 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
test=# 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 PACKAGE
test=# 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;
/
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
test=# 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;
/
CREATE PROCEDURE
--调用普通存储过程
test=# SELECT autonomous_5(11,22);
 autonomous_5 
--------------

(1 row)

--查看表结果
test=# SELECT * FROM t2 ORDER BY a;
 a  | b  
----+----
  1 |  2
 11 | 22
 12 | 23
(3 rows)

test=# DROP TABLE t2;
DROP TABLE

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。

父主题： 自治事务

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