On 1/29/19 10:03 AM, Stefan Keller wrote:
Many thanks to Igor and Adrian for your hints.
Got it to work like this:
create function link_server(_server text, _host text, _port text, _dbname text)
returns void as $$
begin
execute format('create server %s
foreign data wrapper postgres_fdw
options (host %L, port %L, dbname %L)', _server, _host, _port, _dbname);
end;
$$ language plpgsql;
I would go with %I instead of %s for _server.
select link_server('other_db_server', '111.11.11.11', '5432', 'other_db');
But I actually hoped being able avoid "execute"...
Why?
:Stefan
Am Di., 29. Jan. 2019 um 16:21 Uhr schrieb Adrian Klaver
<adrian.klaver@xxxxxxxxxxx>:
On 1/29/19 6:40 AM, Stefan Keller wrote:
Hi,
I'd like to write a function like this:
create function foo(_host text, _port text, _dbname text)
returns void as $$
create server _server
foreign data wrapper postgres_fdw
options (host _host, port _port, dbname _dbname);
-- ERROR: syntax error at or near "_host"
$$ language sql;
In order to e.g. do:
select foo('111.11.11.11', '5432', 'mydb');
How can I set the parameters in 'options' using those variables?
If you are going to use plpgsql, then format:
https://www.postgresql.org/docs/10/functions-string.html#FUNCTIONS-STRING-FORMAT
https://www.postgresql.org/docs/10/plpgsql-statements.html#PLPGSQL-QUOTE-LITERAL-EXAMPLE
So something like:
execute format('create server _server
foreign data wrapper postgres_fdw
options (host $1, port $2, dbname $3') USING _host, _port, _dbname
Not sure where the _server is coming from so that might have to be dealt
with.
:Stefan
P.S. Actually I'll put this code in a plggsql function later on.
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
