2007/3/29, Jasbinder Singh Bali <jsbali@xxxxxxxxx>:
Hi,
I've written a function using cursors as follows:
can anyone please comment on the text in red.
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CREATE OR REPLACE FUNCTION
sp_insert_tbl_email_address(int4, text, text, text)
RETURNS void AS
$BODY$
DECLARE
uid int4 ;
src text;
local text;
domain text;
cur_dup_check CURSOR FOR SELECT * FROM tbl_email_address
WHERE unmask_id=$1 and source=$2 and email_local=$3 and email_domain=$4;
BEGIN
OPEN cur_dup_check ;
FETCH cur_dup_check INTO uid,src,local,domain;
--need to check the fetch status of the cursor whether any rows were
returned or not and keep moving to the next record till fetch status is not
zero
INSERT INTO
tbl_email_address(unmask_id,source,email_local,email_domain)
VALUES ($1,$2,$3,$4) ;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION sp_insert_tbl_email_address(int4, int4,
text, text, text) OWNER TO postgres;
You could check builtin FOUND variable.
Did you read http://www.postgresql.org/docs/8.2/static/plpgsql-cursors.html ?
and do you realize that probably, this can (and should) be done
without cursors? or even without any user defined function?
if I understand correctly, you want something like:
INSERT INTO table(a,b,c) SELECT 'a','b','c' WHERE NOT EXISTS
( SELECT * FROM table WHERE (a,b,c) = ('a','b','c') );
--
Filip Rembiałkowski
