MySql function returns null everytime


MySql function returns null everytime



I have the following function: (The SQL query works perfectly)


CREATE FUNCTION get_participantes (pid INT)
RETURNS varchar(255)
DETERMINISTIC
BEGIN
DECLARE par varchar(255);
SET par = (SELECT GROUP_CONCAT(mail SEPARATOR ',') FROM users WHERE id IN ( SELECT user_id FROM meeting_participants WHERE meeting_id = pid));
RETURN par;
END



And I'm trying to get the return of that function in the following procedure:


CREATE PROCEDURE google_calendar
(p1 varchar(50),
p2 INT,
p3 varchar(50),
p4 varchar(50),
p5 varchar(50),
p6 varchar(50),
p7 varchar(50),
p8 varchar(50))
BEGIN
DECLARE parti VARCHAR(255);
SET @parti = get_participantes(p2);
SELECT COALESCE(@parti,"nullpart") INTO @par2;
SET @cmd = CONCAT('curl "http://*****:80**/meetings/api/" --data-urlencode "id=',p1,'" --data-urlencode "participants=',@par2,'" --data-urlencode "agenda=',p2,'" --data-urlencode "title=',p4,'" --data-urlencode "lugar=',p5,'" --data-urlencode "inicio=',p6,'" --data-urlencode "duracion=',p7,'" --data-urlencode "delete=',p8,'"');
SET @result = sys_eval(@cmd);
END



I use the COALESCE to check if the return of the function is null. The parameters p1 to p8 are fields that i'm getting from a table using an AFTER INSERT TRIGGER. The p2 parameter that goes in the function, is the NEW.id that i get from the trigger. Also i have a error log that prints the parameters that the curl gets, this is an example:



I get nullpart in participants everytime even thought i pass the same parameter (p2) into agenda and it shows me the id perfectly. Please help.



The function works when i call it from outside the procedure:


> SELECT get_participantes(539);$
+------------------------+
| get_participantes(539) |
+------------------------+
| ybejarano@2secure.org |
+------------------------+





What happens if you select @parti?
– Bleach
Jun 29 at 21:49






What do you get if you do SELECT get_participantes(525)?
– Barmar
Jun 29 at 21:52


SELECT get_participantes(525)





@Bleach I get null.
– Yesid Bejarano Camacho
Jun 29 at 21:57






@Barmar IT work and give the emails separated by comma.
– Yesid Bejarano Camacho
Jun 29 at 21:58





How about SET @par2 = COALESCE(@parti,"nullpart"); instead of SELECT?
– Barmar
Jun 29 at 22:03


SET @par2 = COALESCE(@parti,"nullpart");


SELECT









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