在RETURNING语句中使用Record as Function参数

由 bjstry发布于 2020-04-09 06:41:38

我有一个plpgsql函数，它以记录作为参数。

I would like to call this function in the RETURNING statement of an insert, but am unsure what to put as the argument (* does not work) i.e.,

-- Postgres 12

INSERT INTO some_table (a, b, c)
VALUES .....
RETURNING
function_that_takes_record_argument(<the_new_record>)

What can I use in place of <the_new_record>?

苍涼

2020-04-09 06:41:38

要将记录/行传递给函数，您需要明确指定记录类型：

create table t(a int, b text);

create or replace function f(r record) returns int language plpgsql as $$
begin
    return r.a;
end $$;

insert into t values(2, 'b');

select f(t.*), f(t), f((a,b)::t) from t;

 f | f | f 
---+---+---
 2 | 2 | 2

insert into t values(3, 'c') returning f(t);

 f 
---
 3

Oo晓oO

2020-04-09 06:41:38

我不确定为什么您的示例不起作用，但是我会尝试修改数据的CTE：

WITH insert_result AS (
    INSERT INTO ... RETURNING * 
)
SELECT your_function_here(insert_result.*)

See more at https://www.postgresql.org/docs/current/queries-with.html#QUERIES-WITH-MODIFYING

bjstry

这家伙很懒，什么都没留下

积分
0
话题
0
评论
3230
注册排名
1334