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Re: plpgsql : adding record variable to table

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: thomas veymont <thomas(dot)veymont(at)gmail(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: plpgsql : adding record variable to table
Date: 2012-04-19 10:08:18
Message-ID: CAFj8pRDPcAi5h9VZdZx82noXgf6ehbG=-bXFDcX1vQeJz8-5gg@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-sql
2012/4/19 thomas veymont <thomas(dot)veymont(at)gmail(dot)com>:
> hi Pavel,
>
> thanks for your answer,
>

> I don't understand exactly how "y" should be declared, and how it
> should be returned by the function (as a table,
> as a "set of record", or maybe as some kind of generic object, I don't
> know exactly what's possible with pl/psql.).
>

r must used predeclared type - declared type or table. It doesn't work
with "record" type.

Any table specifies composite type too:

create table y(a int, b int);

create or replace function foo()
returns setof y as $$
declare r y;
begin
  for r in select * from y
  loop
    return next r;
  end loop;
  return;
end;

you can declare composite type via command CREATE TYPE

create type y as (a int, b int)

Regards

Pavel Stehule

> cheers
> Tom
>
> 2012/4/18 Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>:
>> Hello
>>
>> please try:
>>
>> postgres=# create or replace function foo()
>> returns void as $$
>> declare r x;
>> begin
>>  for r in select * from x
>>  loop
>>    insert into y values(r.*);
>>  end loop;
>> end;
>> $$ language plpgsql;
>>
>> Regards
>>
>> Pavel
>>
>> 2012/4/18 thomas veymont <thomas(dot)veymont(at)gmail(dot)com>:
>>> (sorry my previous email was truncated)
>>>
>>> hi,
>>>
>>> Here is what I want to do :
>>>
>>> I want to check each row of a table against some conditions (this
>>> check needs some
>>> processing stuff I can easily code with pl/pgsql).
>>>
>>> If the row is OK, I want to add it in a "resulting table",
>>> else I just ignore the current row and go to next one.
>>>
>>> My function looks like this : (simplified)
>>>
>>> FUNCTION myfunction (...)  RETURNS TABLE ( elem1 , elem2, elem3 ...)
>>> DECLARE
>>>   g RECORD
>>> BEGIN
>>>  FOR g in SELECT colum1, column2, ... FROM someTable
>>>   LOOP
>>>      -- do some processing on "g", then decide wheter I want to
>>> select it or not
>>>     IF (g is selected) THEN >>add g to resulting_table<<
>>>   END LOOP
>>>  RETURN resulting_table
>>>
>>> How should I write the "add g to resulting table" part ?
>>>
>>> thanks,
>>> Tom
>>>
>>> --
>>> Sent via pgsql-sql mailing list (pgsql-sql(at)postgresql(dot)org)
>>> To make changes to your subscription:
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