Re: Using arguments with functions

On Sat, 2004-07-10 at 20:50, Robert Fitzpatrick wrote:
> While this function works when hard coded, the following will not when
> trying the same thing with a argument. Can someone point to me what I'm
> doing wrong?
...

> This does not work:
>
> CREATE OR REPLACE FUNCTION "public"."get_next" (varchar) RETURNS varchar AS'
> DECLARE
>   var1 alias for $1;
>
> BEGIN
>   var1 = chr( (ascii(var1) + 1) );
...
> ERROR:  "$1" is declared CONSTANT

You are trying to change the passed parameter.

Instead do

        DECLARE
           var1   varchar;
        BEGIN
           var1 = chr( (ascii($1) + 1) );

which I think should work.

--
Oliver Elphick                                          olly@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA  92C8 39E7 280E 3631 3F0E  1EC0 5664 7A2F A543 10EA
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