function to return both table row and varchar
Hi,
i'm defining a function in plpqsql and would like it to return one varchar
and one row from another table. I have defined it like this (this is only a
test and does not really make sense yet, but it's the principle i'm after):
CREATE OR REPLACE FUNCTION verify_record(IN number_to_verify bigint, OUT
resulting_row logbook, OUT result character varying)
RETURNS record AS
$BODY$
BEGIN
SELECT * INTO resulting_row FROM logbook WHERE
id_number=number_to_verify::varchar;
SELECT 'OK' INTO result;
END
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER
COST 100;
It works fine and i can do a select like this:
select * from verify_record(1234);
resulting_row | result
------------------------------|--------
(1,"Test","Registered",.....) | "OK"
So far so good, but how do I use the the resulting_row further, say if i
would like to select only a few columns or perhaps define a view that
returns the 'result' column and only column 2 "Test" from the resulting_row?
What I'd like to do is a select and sub-address the individual columns of
the resulting_row, like writing (given 'name' is the name of some column in
resulting_row):
select returned_row.name, result from verify_record(1234);
or perhaps
select returned_row['name'], result from verify_record(1234);
and have it return something like:
name | result
-------|--------
"Test" | "OK"
Is this possible or am I on the wrong track here?
//Kenneth
Sorry, I should have RTFM(!!!). I found it under 4.2.4 Field selection.
Apparently it works just as I want, but I should have put parenthesis around
the row-name like this:
select result,(resulting_row).name from verify_record(1234);
name | result
-------|--------
"Test" | "OK"
I also discovered you can do a
select result,(resulting_row).* from verify_record(1234);
to combine the both results to a single returning row if needed... sweet!
//Kenneth
On Thu, Jan 15, 2009 at 11:10 AM, Kenneth Lundin <kenneth.lundin@dacom.se>wrote:
Show quoted text
Hi,
i'm defining a function in plpqsql and would like it to return one varchar
and one row from another table. I have defined it like this (this is only a
test and does not really make sense yet, but it's the principle i'm after):CREATE OR REPLACE FUNCTION verify_record(IN number_to_verify bigint, OUT
resulting_row logbook, OUT result character varying)
RETURNS record AS
$BODY$
BEGIN
SELECT * INTO resulting_row FROM logbook WHERE
id_number=number_to_verify::varchar;
SELECT 'OK' INTO result;
END
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER
COST 100;It works fine and i can do a select like this:
select * from verify_record(1234);
resulting_row | result
------------------------------|--------
(1,"Test","Registered",.....) | "OK"So far so good, but how do I use the the resulting_row further, say if i
would like to select only a few columns or perhaps define a view that
returns the 'result' column and only column 2 "Test" from the resulting_row?
What I'd like to do is a select and sub-address the individual columns of
the resulting_row, like writing (given 'name' is the name of some column in
resulting_row):select returned_row.name, result from verify_record(1234);
or perhaps
select returned_row['name'], result from verify_record(1234);
and have it return something like:
name | result
-------|--------
"Test" | "OK"Is this possible or am I on the wrong track here?
//Kenneth