Re: ERROR: $1 is declared CONSTANT in plpgsql

I'd guess this line is the problem:
InpAscii := $1;
I believe this parses to
$1:=$1;
and a bit later down:
InpAscii := Part1 || CharMap.html || Part2 ;
would, I believe, parse to
$1:=Part1 || CharMap.html || Part2;
I don't know wether it is permitted to assign values to
the arguments passed (although I'd imagine not),
but I don't do it myself.
Cheers,
- Stuart

> -----Original Message-----
> From: Hans Plum [mailto:plum(at)giub(dot)uni-bonn(dot)de]
>
> Hello folks,
> I wrote my first plpgsql-functions for PostgreSQL 7.1.3. I try to
> convert Ascii-Strings in HTML-conform Strings (Converting
> 'Äquator' ->
> 'Äquator') ... Now I get a error message like this:
>
> NOTICE: plpgsql: ERROR during compile of f_ascii2html near line 7
> ERROR: $1 is declared CONSTANT
>
> For me $1, or better InpAscii is not CONSTANT ... I cannot find the
> mistake ... Can anybody help out?
>
> Hopefully, you can reproduce the error with the code right here.
>
> Thanks a lot,
> Hans
>
> PS:
> There is some debug-code that I have not used because the
> functions does
> not work ;-)).
>
> -- BEGIN OF SKRIPT ...
>
>
> DROP TABLE t_ascii2html;
>
> /* table for replacing letters */
>
> CREATE TABLE t_ascii2html (
> ascii VARCHAR(1),
> html VARCHAR(20)
> );
>
> INSERT INTO t_ascii2html VALUES ('ä','ä');
> INSERT INTO t_ascii2html VALUES ('ö','ö');
> INSERT INTO t_ascii2html VALUES ('ü','ü');
> INSERT INTO t_ascii2html VALUES ('Ä','ä');
> INSERT INTO t_ascii2html VALUES ('Ö','ö');
> INSERT INTO t_ascii2html VALUES ('Ü','ü');
> INSERT INTO t_ascii2html VALUES ('ß','ß');
> INSERT INTO t_ascii2html VALUES ('"','"');
> INSERT INTO t_ascii2html VALUES ('&','&');
> INSERT INTO t_ascii2html VALUES ('<','&lt;');
> INSERT INTO t_ascii2html VALUES ('>','&gt;');
>
>
> DROP FUNCTION f_ascii2html(TEXT);
>
>
> /* Converting 'special' letters (eg. german umlaute like "ö") into a
> HTML-conform string */
>
> CREATE FUNCTION f_ascii2html(TEXT)
> RETURNS TEXT
> AS '
> DECLARE
> InpAscii ALIAS FOR $1;
> CharMap RECORD;
> InsertPosition INTEGER;
> Part1 TEXT;
> Part2 TEXT;
> BEGIN
> InpAscii := $1;
>
> -- Select all datasets from the table
> describing the replacement
> FOR CharMap IN SELECT * FROM f_ascii2html LOOP
> RAISE NOTICE ''CharMap ---
> ASCII: %, HTML: %'', t_ascii2html.ascii,
> t_ascii2html.html;
>
> WHILE InpAscii ~ CharMap.ascii
> RAISE NOTICE
> ''INPASCII: %'', InpAscii;
> SELECT
> position(InpAscii IN CharMap.ascii)
> INTO InsertPosition;
> RAISE NOTICE
> ''INSERTPOSITION: %'', InsertPosition;
> SELECT substrg(InpAscii
> FROM (InsertPosition - 1))
> INTO Part1;
> RAISE NOTICE ''PART1:
> %'', Part1;
> SELECT substrg(InpAscii
> FROM (InsertPosition + 1))
> INTO Part2;
> RAISE NOTICE ''PART2:
> %'', Part2;
> InpAscii := Part1 ||
> CharMap.html || Part2 ;
> RAISE NOTICE
> ''INPASCII: %'', InpAscii;
> END LOOP;
> END LOOP;
> RAISE NOTICE ''InpAscii: %'', InpAscii;
> RETURN InpAscii
> END;
> '
>
> LANGUAGE 'plpgsql';
>
> /* Sample: Converting 'Äquator' -> '&Auml;quator' */
>
> select f_ascii2html('Äquator');
>
> /* I get the following error message:
> NOTICE: plpgsql: ERROR during compile of f_ascii2html near line 7
> ERROR: $1 is declared CONSTANT
> */