I know it would be non-standard, but I would love to see Postgres support the likes of nested functions.
I know that would be non-standard, but Postgres has lots of non-standard features that make it more like a real programming language and considerably more productive.
On Jun 3, 2021, 12:34 -0700, Bruce Momjian <bruce@momjian.us>, wrote:
On Thu, Jun 3, 2021 at 03:21:15PM -0400, Tom Lane wrote:
Adrian Klaver <adrian.klaver@aklaver.com> writes:
On 6/3/21 12:01 PM, Bruce Momjian wrote:
On Thu, Jun 3, 2021 at 08:58:03PM +0200, Marc Millas wrote:
within a function, I want to create another function.
You can't create functions inside of functions; same for procedures.
Sure you can:
Yeah. The actual problem here is that Marc is expecting variable
substitution to occur within a utility (DDL) statement, which it
doesn't. The workaround is to build the command as a string and
use EXECUTE, as Adrian illustrated:
EXECUTE 'create function ' || bidule || '() RETURNS void language
plpgsql AS $fnc$ BEGIN END; $fnc$ ';
This is not terribly well explained in the existing docs. I tried
to improve the explanation awhile ago in HEAD:
https://www.postgresql.org/docs/devel/plpgsql-statements.html#PLPGSQL-STATEMENTS-GENERAL-SQL
Oh, I thought he wanted to declare a function inside the function that
could be called only by that function, like private functions in Oracle
packages can do. Yes, you can create a function that defines a function
that can be called later. I guess you could also create a function that
_conditionally_ creates a function that it can call itself too. My
point is that you can't create a function that has function scope ---
they all have schema scope.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
