Re: Function returning SETOF

On Thu, Dec 01, 2005 at 12:32:02PM -0500, Terry Lee Tucker wrote:
> List,
>
> I have a simple function:

I have a simpler one :)

CREATE OR REPLACE FUNCTION split_to_rows(TEXT, TEXT) /* Descriptive name */
RETURNS SETOF TEXT
STRICT
LANGUAGE sql
AS $$
SELECT (string_to_array($1, $2))[s.i]
FROM generate_series(
1,
array_upper(string_to_array($1, $2), 1)
) AS s(i);
$$;

Cheers,
D
> CREATE OR REPLACE FUNCTION parse_string (TEXT, TEXT) RETURNS SETOF TEXT AS '
> DECLARE
> str ALIAS FOR $1; -- the string to parse
> delimiter ALIAS FOR $2; -- the delimiter
> field TEXT; -- return value from split_part
> idx INTEGER DEFAULT 1; -- field counter
> funcName TEXT DEFAULT ''parse_string''; -- function name
> dbg BOOLEAN DEFAULT True; -- debug print flag
> BEGIN
> IF dbg THEN
> RAISE NOTICE ''% ()'', funcName;
> END IF;
> SELECT INTO field split_part (str, delimiter, idx);
> WHILE field != '''' LOOP
> RETURN NEXT field;
> idx = idx + 1;
> SELECT INTO field split_part (str, delimiter, idx);
> END LOOP;
> RETURN;
> END;
> ' LANGUAGE 'plpgsql';
>
> As you can see, I'm using split_part to parse the string in a loop. I want
> this thing to return the set of values that make up the fields in the string.
> When I call the function from psql here is the error I'm getting:
> rnd=# select parse_string ('1/2/3/4/5', '/');
> NOTICE: parse_string ()
> ERROR: set-valued function called in context that cannot accept a set
> CONTEXT: PL/pgSQL function "parse_string" line 14 at return next
>
> Then I tried this approach and got the same error:
> rnd=# select ARRAY(SELECT parse_string ('1/2/3/4/5', '/'));
> NOTICE: parse_string ()
> ERROR: set-valued function called in context that cannot accept a set
> CONTEXT: PL/pgSQL function "parse_string" line 14 at return next
>
> Version Information:
> rnd=# select version();
> version
> --------------------------------------------------------------------------------------------------------------
> PostgreSQL 7.4.6 on i686-redhat-linux-gnu, compiled by GCC gcc (GCC) 3.2.3
> 20030502 (Red Hat Linux 3.2.3-49)
>
> I'm sure that I'm doing something stupid. Any input would be appreciated...
>
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David Fetter david(at)fetter(dot)org http://fetter.org/
phone: +1 415 235 3778

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