Обсуждение: PLpgSQL-Problem

Hi,

i am playing around with PLpgSQL and can not solve one problem: I am fetching some rows of a special rowtype and wanna
givethis 
rows step by step to a function with this rowtype as parameter.

evertime i get the errormessage: ERROR:  Attribut »_row« not found

but the Attribut exists and has values in his fields. i have absolutly no idea was happens there. can someone help me
please?

thanx
thomas

-------snip function 1

CREATE OR REPLACE FUNCTION "public"."compress_main" (date) RETURNS boolean AS'
DECLARE
    _day ALIAS FOR $1;
    _row public.tmp_order_data%ROWTYPE;
    _result boolean;
    eb bigint;
BEGIN

    DELETE FROM hlp_operator WHERE selling_date = _day;

    FOR _row IN
        SELECT * FROM tmp_order_data WHERE business_day = _day ORDER BY transactiontime
    LOOP
        IF _row.id_transactiontype = 100 THEN
            SELECT INTO _result compress_100(_row);
        END IF;
    END LOOP;

    RETURN TRUE;
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

-------snip function 2:

CREATE OR REPLACE FUNCTION "public"."compress_100" ("public"."tmp_order_data") RETURNS boolean AS'
DECLARE
    _record ALIAS FOR $1;
    _shift int8;
BEGIN

    /* any code */

    RETURN TRUE;
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

"Thomas Chille" <thomas@chille.de> writes:
> evertime i get the errormessage: ERROR:  Attribut �_row� not found
> but the Attribut exists and has values in his fields. i have absolutly no idea was happens there. can someone help me
please?

You're out of luck :-( ... plpgsql doesn't presently have the ability to
pass a whole-row value to the main executor, which means this won't
work:

>             SELECT INTO _result compress_100(_row);

Possibly it will work in 7.5; I've made some preliminary steps in that
direction but it's not all there yet.

            regards, tom lane

Hello Tom,

thank u for your fast reply!

Now I understand that i can not split easily my scripts into logical units but what i not understand is the documention
notcorrect 
or is my problem not similiar to the example in point 37.4.3 on
http://www.postgresql.org/docs/7.4/static/plpgsql-declarations.html
?

thank u for your help,
thomas

"Thomas Chille" <thomas@chille.de> writes:
> Now I understand that i can not split easily my scripts into logical units but what i not understand is the
documentionnot correct 
> or is my problem not similiar to the example in point 37.4.3 on
http://www.postgresql.org/docs/7.4/static/plpgsql-declarations.html
> ?

It is, but the only sort of operation you can apply to a row variable in
plpgsql is to extract a field from it.  Other operations like calling a
function on it don't work (yet).

            regards, tom lane

Hi Tom,

sorry for asking again on the same issue but i try to figure out how i have to deal with and how strong i can trust the
postgres-docs and -books.

in every documentation(7.5 too) i can read that i can pass a row to a plpgsql function. but how u know it does not
work.i am still 
thinking i am wrong or are really all that docs wrong?

And if the documentation is wrong, is this normal for the postgres-docs?

I dont wanna steal your time, but i can not understand it.

regards
thomas

"Thomas Chille" <thomas@chille.de> writes:
> in every documentation(7.5 too) i can read that i can pass a row to a
> plpgsql function. but how u know it does not work.

It does work ... from a SQL statement.  The problem you are running into
is that a whole-row variable of a plpgsql function can't be passed as a
unit into a SQL statement.  (I thought this limitation was documented
somewhere in the plpgsql chapter, but right at the moment I can't find
anything about it.)

> And if the documentation is wrong, is this normal for the postgres-docs?

The documentation is not perfect.

            regards, tom lane