From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: plpgsql - execute - cannot use a reference to record field |
Date: | 2019-04-15 16:07:25 |
Message-ID: | 16344.1555344445@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> Is there reason why following code should not to work?
> do $$
> declare r record; result int;
> begin
> select 10 as a, 20 as b into r;
> raise notice 'a: %', r.a;
> execute 'select $1.a + $1.b' into result using r;
> raise notice '%', result;
> end;
> $$
You can't select fields by name out of an unspecified record.
The EXECUTE'd query is not particularly different from
regression=# prepare foo(record) as select $1.a + $1.b;
psql: ERROR: could not identify column "a" in record data type
LINE 1: prepare foo(record) as select $1.a + $1.b;
^
and surely you wouldn't expect that to work.
(The fact that either of the previous lines work is
thanks to plpgsql-specific hacking.)
regards, tom lane
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