Обсуждение: plpgsql - execute - cannot use a reference to record field
Hi
Is there reason why following code should not to work?
do $$
declare r record; result int;
begin
select 10 as a, 20 as b into r;
raise notice 'a: %', r.a;
execute 'select $1.a + $1.b' into result using r;
raise notice '%', result;
end;
$$
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;
$$
but it fails
NOTICE: a: 10
ERROR: could not identify column "a" in record data type
LINE 1: select $1.a + $1.b
^
QUERY: select $1.a + $1.b
CONTEXT: PL/pgSQL function inline_code_block line 6 at EXECUTE
ERROR: could not identify column "a" in record data type
LINE 1: select $1.a + $1.b
^
QUERY: select $1.a + $1.b
CONTEXT: PL/pgSQL function inline_code_block line 6 at EXECUTE
Regards
Pavel
Pavel Stehule <pavel.stehule@gmail.com> writes:
> Is there reason why following code should not to work?
> do $$
> 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;
> $$
You can't select fields by name out of an unspecified record.
The EXECUTE'd query is not particularly different from
regression=# prepare foo(record) as select $1.a + $1.b;
psql: ERROR: could not identify column "a" in record data type
LINE 1: prepare foo(record) as select $1.a + $1.b;
^
and surely you wouldn't expect that to work.
(The fact that either of the previous lines work is
thanks to plpgsql-specific hacking.)
regards, tom lane
po 15. 4. 2019 v 18:07 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal:
Pavel Stehule <pavel.stehule@gmail.com> writes:
> Is there reason why following code should not to work?
> do $$
> 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.)
yes. I looking to the code and I see so SPI_execute_with_args doesn't allow push typmods there.
Regards
Pavel
regards, tom lane