Re: Function returning SETOF - Mailing list pgsql-general

I knew I was doing something stupid. Right after I sent this I realized I was
calling incorrectly. This works:
rnd=# select * from parse_string ('1/2/3/4/5', '/');
NOTICE:  parse_string ()
 parse_string
--------------
 1
 2
 3
 4
 5
(5 rows)

And so does this:
rnd=# select ARRAY(SELECT * from parse_string ('1/2/3/4/5', '/'));
NOTICE:  parse_string ()
  ?column?
-------------
 {1,2,3,4,5}
(1 row)

On Thursday 01 December 2005 12:32 pm, Terry Lee Tucker saith:
> List,
>
> I have a simple function:
> 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...
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster

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