匿名块支持自治事务

自治事务可以在匿名块中定义，标识符为PRAGMA AUTONOMOUS_TRANSACTION，其余语法与创建匿名块语法相同，请参见 匿名块，示例如下。

gaussdb=# CREATE TABLE t1(a INT ,B TEXT);
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

gaussdb=# START TRANSACTION;
START TRANSACTION
gaussdb=# DECLARE 
	PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
	DBE_OUTPUT.PRINT_LINE('JUST USE CALL.');
	INSERT INTO t1 VALUES(1,'YOU ARE SO CUTE,WILL COMMIT!');
END;
/
JUST USE CALL.
ANONYMOUS BLOCK EXECUTE

gaussdb=# INSERT INTO t1 VALUES(1,'YOU WILL ROLLBACK!');
INSERT 0 1
gaussdb=# ROLLBACK;
ROLLBACK
gaussdb=# SELECT * FROM t1;
 a |              b               
---+------------------------------
 1 | YOU ARE SO CUTE,WILL COMMIT!
(1 row)

gaussdb=# DROP TABLE t1;
DROP TABLE

上述例子，最后在回滚的事务块前执行包含自治事务的匿名块，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。