Re: [SQL] Beginner problems with functions (Was: Is this the wrong list?)

On Thu, 17 Aug 2000, Andreas Tille wrote:

> On Wed, 16 Aug 2000, Stephan Szabo wrote on pgsql-general(at)postgresql(dot)org:
> (sorry for the crossposting, just to tell the list that I now switched to
> the right one hopefully)
>
> > I think the thing is that most people don't have basic examples, they
> Perhaps someone knows one nice doc. I only found some hints for
> ma problems in the PGSQL-Part of the Bruce Momjian book. But
> may be PGSQL is in fact the thing I want and so I may possibly stick to
> that. Now here is the first question about that:
>
> web=# create function atTest ( varchar )
> web-# returns bool
> web-# As ' BEGIN
> web'# Select * From Mitarbeiter Where FName = $1 ;
> web'# IF NOT FOUND THEN
> web'# RETURN ''f'' ;
> web'# ELSE
> web'# RETURN ''t'' ;
> web'# END IF ;
> web'# END; '
> web-# language 'plpgsql' ;
> CREATE
> web=# SELECT attest ( 'Tille' ) ;
> ERROR: unexpected SELECT query in exec_stmt_execsql()
> web=#
>
> Could somebody enlighten me, what here goes wrong?

What you may need to do is declare a variable of type record
and do SELECT INTO <variable> * From ... rather than just
the SELECT.

> > CREATE FUNCTION hobbies(person)
> > RETURNS setof hobbies_r
> > AS 'select * from hobbies_r where person = $1.name'
> > LANGUAGE 'sql';
> But it returns just did:
>
>
> web=# SELECT my_test ( ) ;
>
> ?column?
> -----------
> 136437368
> 136437368
> 136437368
> ...
>
> I had the hope to get the contents of the table like if I would
> do 'SELECT * FROM table;'

Yeah, setof <record type> seems fairly wierd. SETOF basetype if
you do a SELECT <col> FROM table seems to work though.
I sort of expected that the ones in the regression test would
either do something understandable or at least error if they
are testing for brokenness.