我想在触发器中计算时间码块

Question

我在 Postgresql 中创建了一个触发器。此触发器执行一些更新语句。我想计算做这些语句的时间有多少。一个例子我有两个更新语句并且我不知道这些语句的执行时间。第一个更新执行时间是什么，第二个更新执行时间是什么？ {

create or replace
function public.insert_sth() returns trigger language plpgsql as $function$
declare time1 timestamp without time zone;
declare time2 timestamp without time zone;
declare timediff bigint;
begin
time1:=current_timestamp;--now();
RAISE NOTICE 'Calling update healthy time1 %', time1;   
if exists(
    select 1
from
    basetable
where
    id= NEW.id) then update
    basetable
set
    previous_id= this_id
where
    id= NEW.id;

update
    basetable
set
    this_id= NEW.id
where
    id= NEW.id;

update
    basetable
set
    healthy_id= (
        select id
    from
        sometable
    where
        connectionresult = 0
        or connectionresult = 2
        and sometable.id= NEW.id
    order by
        sometable.actiontime desc
    limit 1)
where
    id= new.id;
time2:=current_timestamp;--now();
timediff:= (EXTRACT('epoch' from time2) - EXTRACT('epoch' from time1)) * 1000;

RAISE NOTICE 'Calling update healthy check %', timediff;

RAISE NOTICE 'Calling update healthy time2 %', time2;
return new;

else insert
    into
        bastable(id,
        this_id)
    values(NEW.id,
    NEW.id);

return new;

end if;

end;

$function$ ;

}

但输出是：

00000: 调用更新健康时间1 2019-07-18 17:00:08.085
00000: 调用更新健康检查0
00000: 调用更新健康时间2 2019-07-18 17:00:08.085

这是不可能的。更新执行不应为 0 毫秒。 :)

Answer 1

问题出在 current_timestamp。整个交易都是一样的。

使用clock_timestamp代替

它将反映时钟时间。

DIfference between CURRENT_TIMESTAMP AND CLOCK_TIMESTAMP()

我想在触发器中计算时间码块

I want to calculate time code block in trigger

postgresql

time

triggers

execution