set “VALID UNTIL” value with a calculated timestamp

问题

I want to create user or change password with a timestamp calculated over current time. example:

# CREATE USER user WITH PASSWORD 'password12345678' VALID UNTIL '(NOW() + interval 1 month)';

of course it's not valid:

ERROR: invalid input syntax for type timestamp with time zone: "(NOW() + interval 1 month)"

回答1:

Utility commands like CREATE USER do not accept expressions, only literals. You need dynamic SQL.

DO
$do$
BEGIN
   EXECUTE format($$CREATE USER myuser WITH PASSWORD 'password12345678' VALID UNTIL %L$$, NOW() + interval '1 month');
END
$do$;

Detailed explanation:

• Creating user with password from variables in anonymous block

回答2:

I am not familiar with postgresql but from a quick google search it appears you want the following:

CURRENT_DATE + INTERVAL '1 month';

来源：https://stackoverflow.com/questions/54482903/set-valid-until-value-with-a-calculated-timestamp