Обсуждение: Why?

Hi!

Why does not work this?

CREATE FUNCTION PWDCHG () RETURNS OPAQUE AS '
BEGIN
ALTER USER utest WITH PASSWORD ''ptest'';
END;
' LANGUAGE 'plpgsql';

select PWDCHG();
ERROR:  typeidTypeRelid: Invalid type - oid = 0


and this other?

CREATE FUNCTION PWDCHG () RETURNS bool AS '
BEGIN
ALTER USER utest WITH PASSWORD ''ptest'';
RETURN ''t'';
END;
' LANGUAGE 'plpgsql';

select PWDCHG();
ERROR:  copyObject: don't know how to copy 646

Regards,
Juan Carlos.


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On Sun, 27 Aug 2000, Juan Carlos Perez Vazquez wrote:

> Hi!
> 
> Why does not work this?
> 
> CREATE FUNCTION PWDCHG () RETURNS OPAQUE AS '
> BEGIN
> ALTER USER utest WITH PASSWORD ''ptest'';
> END;
> ' LANGUAGE 'plpgsql';
> 
> select PWDCHG();
> ERROR:  typeidTypeRelid: Invalid type - oid = 0

You don't select functions that have return type
OPAQUE.  Think of functions returning opaque
as procedures that cannot be called in a context
where their return value is used.
Plus, the utility commands aren't fully implemented
in plpgsql in 7.0 (more below)

> and this other?
> 
> CREATE FUNCTION PWDCHG () RETURNS bool AS '
> BEGIN
> ALTER USER utest WITH PASSWORD ''ptest'';
> RETURN ''t'';
> END;
> ' LANGUAGE 'plpgsql';
> 
> select PWDCHG();
> ERROR:  copyObject: don't know how to copy 646

In 7.0 most of the utility commands are not 
available in plpgsql.  They should be available
in 7.1.  I don't know if any of the other pl
languages had utility commands that worked in
7.0 (I don't know tcl and didn't compile pl/perl),
but that's another possibility for how to do it.