Re: Functions return a select in a table, which data type I

В Птн, 22.10.2004, в 15:38, Markus Bertheau пишет:

> CREATE TYPE foo_type AS (cod_aluno TEXT, nome TEXT, cpf TEXT);
> CREATE FUNCTION bar(int4)
> RETURNS SETOF foo_type
> LANGUAGE 'SQL'
That should be LANGUAGE 'plpgsql'
> AS '
> DECLARE
> var_rec foo_type;
> BEGIN
> FOR var_rec IN SELECT cod_aluno, nome, cpf FROM table WHERE ... LOOP
> RETURN NEXT var_rec;
> END LOOP;
> RETURN;
> END;
> ';

And if you want that function in SQL, there are two kinds of situations,
for which the solutions differ: If the record structure that the
function should return is the same as the structure of a table, you can
use the table name as the type. If this is not the case, you have to
create a custom type:

CREATE FUNCTION bar(int4)
RETURNS table_name or custom_type_name
LANGUAGE 'SQL'
AS '
SELECT whatever FROM table WHERE field = $1 AND foo;
END;
';

$1 is the value of the first argument.

--
Markus Bertheau <twanger(at)bluetwanger(dot)de>