函数支持自治事务

自治事务可以在函数中定义，标识符为PRAGMA AUTONOMOUS_TRANSACTION，其余语法与函数语法相同，示例如下。

create table t4(a int, b int, c text);
CREATE OR REPLACE function autonomous_32(a int ,b int ,c text) RETURN int AS
DECLARE
  PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
  insert into t4 values(a, b, c);
  return 1;
END;
/
CREATE OR REPLACE function autonomous_33(num1 int) RETURN int AS
DECLARE
  num3 int := 220;
  tmp int;
  PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
  num3 := num3/num1;
  return num3;
EXCEPTION
  WHEN division_by_zero THEN
    select autonomous_32(num3, num1, sqlerrm) into tmp;
    return 0;
END;
/
select autonomous_33(0);
select * from t4;