Обсуждение: using arrays as variable, not as field

I read the doc on
http://www.postgresql.org/docs/view.php?version=7.3&idoc=1&file=arrays.h
tml

These doc say you can use array_dims to get the dimension of an array.
But when I try to do some this

select array_dims('{1,2,3,4,5}');

I get this message:

ERROR:  Cannot accept a constant of type ANYARRAY

I see several examples on "field" arrays, but I need to use a variable
with array type inside pl/pgsql (not inside a table), and I need to know
the length of this array. My instalation is 7.3.1.

Anybody have a tip about that?

Thanks in advance!

--
Fernando O. Papa
DBA

"Fernando Papa" <fpapa@claxson.com> writes:
> These doc say you can use array_dims to get the dimension of an array.
> But when I try to do some this
> select array_dims('{1,2,3,4,5}');
> I get this message:
> ERROR:  Cannot accept a constant of type ANYARRAY

That's not an array, it's just an untyped string.  This works:

regression=# select array_dims('{1,2,3,4,5}'::int[]);
 array_dims
------------
 [1:5]
(1 row)


            regards, tom lane

Ooops... thanks a lot Tom!!!

Maybe I need to read againt some chapters...

--
Fernando O. Papa
DBA


> -----Mensaje original-----
> De: Tom Lane [mailto:tgl@sss.pgh.pa.us]
> Enviado el: jueves, 20 de marzo de 2003 13:57
> Para: Fernando Papa
> CC: pgsql-general
> Asunto: Re: [GENERAL] using arrays as variable, not as field
>
>
> "Fernando Papa" <fpapa@claxson.com> writes:
> > These doc say you can use array_dims to get the dimension
> of an array.
> > But when I try to do some this select array_dims('{1,2,3,4,5}');
> > I get this message:
> > ERROR:  Cannot accept a constant of type ANYARRAY
>
> That's not an array, it's just an untyped string.  This works:
>
> regression=# select array_dims('{1,2,3,4,5}'::int[]);  array_dims
> ------------
>  [1:5]
> (1 row)
>
>
>             regards, tom lane
>