Re: select from composite type

here an example (the actual case in more complex, but the point it's the
same)

do $$
declare
_attribute_list temp1.my_type[];
_attribute temp1.my_type;

_r record;
begin
_attribute_list=array[row(1,'Hello') , row(2,'Goodbye')];

_attribute= row(1,'Doh!!!!');

raise notice '%', _attribute_list;

for _r in execute 'select * from unnest($1) where foo=1' using
_attribute_list loop
raise notice '%', _r;
end loop;

--Error
execute 'select * from $1' using _attribute into _r;

raise notice '%', _r;
end;
$$;

So I able to manage an array of complex type (why I use an array, because
in a previous answer the community suggest to me to use an array to pass a
list of information instead of temporary table), but I can't do the same
thing with just an element.

Of course I can set an element as part of an array with just that element
but. it's sad...

Il giorno lun 5 feb 2024 alle ore 01:48 David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> ha scritto:

> On Sun, Feb 4, 2024 at 5:39 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
> wrote:
>
>>
>> >
>> > attribute_list is an array of composite type (with 20 fields).
>>
>> I am trying to wrap my head around "array of composite type". Please
>> provide an example.
>>
>
> ARRAY[ (1,2)::point, (3,4)::point ]::point[]
>
> The main problem is the concept of writing "from($1)" in any query makes
> no sense, you cannot parameterize a from clause directly like that. You
> have to put the value somewhere an expression is directly allowed.
>
> David J.
>

--
Domenico L.

per stupire mezz'ora basta un libro di storia,
io cercai di imparare la Treccani a memoria... [F.d.A.]