Can somebody explain this? (evrything is in the example below!). I use postgresql 9.4. WARNING! In the code below I drop the "object type" composite type and the "example_data" temporary table , be sure you don't have these in your database... Just in case, I commented the drop commands, uncomment them if needed...
--drop type if exists object_type;
--drop table if exists example_data;
create type object_type as (
id text
,value text);
create temporary table example_data as (
select
'id1'::text as id,
'example value'::text as value);
do $$
declare
my_object object_type;
begin
-- The fiolowing doesn't work, we can't use INTO with the whole object
-- Some how, it tries to put the whole object into the first attribute:
select (id,value)::object_type
into my_object
from example_data;
raise warning 'ID: %, VALUE: %', my_object.id, my_object.value;
-- What a shame! It would have been so much more convenient than the following:
-- to feed the object we need to repeat each one of the attribute in the INTO section:
select id, value
into my_object.id, my_object.value
from example_data;
raise warning 'ID: %, VALUE: %', my_object.id, my_object.value;
/*
In that example it is not so bad, but when you have very large object, it is very ugly to repeat each one
of the attribute, for example:
select (att1, att2, att3, att4, att5, att6, att7, att8, att9, att10)::object_type2 into my_object2
and, (very heavy):
select att1, att2, att3, att4, att5, att6, att7, att8, att9, att10
into my_object2.att1, my_object2.att2, my_object2.att3, my_object2.att4, my_object2.att5, my_object2.att6,
my_object2.att7, my_object2.att8, my_object2.att9, my_object2.att10
*/
end $$;
--drop type if exists object_type;
--drop table if exists example_data;
Following the documentation:
...
select id, value
into my_object
from example_data;
...