Hello,
I am still thinking, about using DO statement from psql console. I am
missing any parametrisation. It could not be a problem. All pl have a
support for parameters, we have a libpq function PQexecParams - so we
need only some "USING" clause. I propose following syntax (and using
from client environments)
DO $$ body $$ USING expr [ ,expr [...]];
body should to have a unnamed parameters in syntax related to any PL.
I'll use plpgsql for this moment.
so some the most simply sample should look like:
DO $$
BEGIN RAISE NOTICE 'Hello, %', $1;
END
$$ USING 'World';
From psql:
\set message World
DO $$BEGIN RAISE NOTICE 'Hello, %', $1; END$$ USING :message;
From pgscript:
SET @message = 'World';
DO $$BEGIN RAISE NOTICE 'Hello, %', $1; END$$ USING @message;
From C
values[0] = "World";
result = PQexecParams(cn, "DO $$BEGIN RAISE NOTICE 'Hello, %', $1;
END;$$ USING $1", 1,
NULL,values, NULL, NULL,
0);
What do you thing about this proposal?
Regards
Pavel Stehule
