所以,我现在知道我找不到postgresql tabes(PostgreSQL: Table creation time)的表创建时间。)我希望仍能获得在某个日期之后创建的表的代理。我的数据库中的大多数表都有created_at日期。有没有办法检查所有表格中的min(created_at)日期是> x,没有逐桌查询?
答案 0 :(得分:0)
免责声明:实际上它不是整个问题的答案,而只是
所以,我现在知道我找不到postgresql tabes的表创建时间
是的,但您可以使用event triggers自行收集此类数据。
有例子:
/*
drop table if exists t1;
drop table if exists public.t2;
drop event trigger if exists tg_table_created_at;
drop function if exists fn_table_created_at();
drop table if exists table_created_at;
*/
create table table_created_at(
toid oid,
tname text,
created_at timestamptz default clock_timestamp());
create function fn_table_created_at()
returns event_trigger
language plpgsql
as $$
begin
insert into table_created_at(toid, tname)
select objid, object_identity
from pg_event_trigger_ddl_commands()
where command_tag = 'CREATE TABLE';
end $$;
create event trigger tg_table_created_at on ddl_command_end
execute procedure fn_table_created_at();
create temp table t1();
select pg_sleep(1);
create table public.t2();
select *, toid::regclass from table_created_at;
结果:
╔═══════╤════════════╤═══════════════════════════════╤══════════════╗ ║ toid │ tname │ created_at │ toid ║ ╠═══════╪════════════╪═══════════════════════════════╪══════════════╣ ║ 87803 │ pg_temp.t1 │ 2017-03-03 20:05:44.339811+02 │ pg_temp_3.t1 ║ ║ 87806 │ public.t2 │ 2017-03-03 20:05:45.344503+02 │ public.t2 ║ ╚═══════╧════════════╧═══════════════════════════════╧══════════════╝
以及其他几个链接:Event Trigger Functions,Event Trigger Firing Matrix,Object Identifier Types。