Re: NO DATA FOUND Exception

In case you would like to use set returning functions...

if your function will return records with the same structure as an existing table
CREATE FUNCTION my_func() RETURNS SETOF my_table AS ...

if not you have to define the returning type
CREATE TYPE func_row AS ("field1" varchar(10), "field2" integer, "field3" integer, ...)
CREATE FUNCTION my_func() RETURNS SETOF func_row AS ...

now you can use your function
SELECT * FROM my_func();

or

SELECT A.field1, A.field2
FROM my_func() A left join my_func() B on A.field2 = B.field3
WHERE A.field1 like 'B%';

>>> "Fernando Hevia" <fhevia(at)ip-tel(dot)com(dot)ar> 2007-06-26 16:25 >>>

On Jun 25, 2007, at 17:05, Michael Glaesemann wrote:

>[Please create a new message to post about a new topic, rather than
>replying to and changing the subject of a previous message. This will
>allow mail clients which understand the References: header to
>properly thread replies.]

Wasn't aware of this. Will do.
I should obtain a better mail client.

>However, it looks like you're trying to return a set of results
>(i.e., many rows), rather than just a single row. You'll want to look
>at set returning functions. One approach (probably not the best)
>would be to expand p_line into all of the possible v_search items and
>append that to your query, which would look something like:

Thank you for your help. All the advice was very useful and I have now a
working function.
I still have an issue left: I would like my function to return multiple
values (as in columns of a row).
Actually I found two possibilities: array and record. I ended up using
arrays since I couldn't figure out how to access the record data from
outside the function. Nevertheless I think a solution based on returning a
record type when you actually want to return the whole row would be more
elegant.

For example:

CREATE TABLE table1 (
field1 text,
field2 text,
field3 text
);

INSERT INTO table1 ('data1', 'data2', 'data3');

CREATE FUNCTION my_func() RETURNS record AS
$body$
DECLARE
v_row table1%ROWTYPE;
BEGIN

SELECT *
INTO v_row
FROM table1
WHERE <condition> ;

IF FOUND THEN
RETURN v_row;
END IF;

RETURN NULL;

END;
$body$
LANGUAGE 'plpgsql';

SELECT my_func();
my_func
---------------------------------------------------
(data1, data2, data3)

How do I refer a specific field of the returned row from outside the
function? How should I write the query in order to show only fields 1 and 3,
for example?

It's sad to bother with this syntax questions, but I've had a hard time
finding code examples online.

Regards,
Fernando.

---------------------------(end of broadcast)---------------------------
TIP 7: You can help support the PostgreSQL project by donating at

http://www.postgresql.org/about/donate