Can someone please tell me whats wrong with this trigger statement?
DELIMITER //
CREATE TRIGGER something AFTER INSERT ON sometable
FOR EACH ROW
BEGIN
DECLARE var INT DEFAULT 0;
SET var = SELECT COUNT(*) FROM anothertable;
IF var=0 THEN
INSERT INTO anothertable values(`x`,`y`,`z`);
END IF;
END//
I keep getting error saying i have syntax errors...
Try putting the SELECT statement within brackets:
DELIMITER //
CREATE TRIGGER something AFTER INSERT ON sometable
FOR EACH ROW
BEGIN
DECLARE var INT DEFAULT 0;
SET var = (SELECT COUNT(*) FROM anothertable);
IF var=0 THEN
INSERT INTO anothertable values('x','y','z');
END IF;
END//
Related
Is it possible to insert a control on the data that insert in a table? In a way that satisfies a specific condition provided, otherwise not
drop function Presente;
delimiter //
create function Presente( Persona_Da_Cercare varchar(16), Data_Legge date) returns int
begin
declare risultato int;
select count(*) into risultato
from PARLAMENTARI_IN_CARICA as pic
where Persona_Da_Cercare = pic.Persona and data_Legge >= pic.Data_Eletto;
if risultato = 0
then
select count(*) into risultato
from STORICO_PARLAMENTARI as sp
where Persona_Da_Cercare = sp.Persona and data_Legge >= sp.Data_Inizio and data_Legge <= sp.Data_Fine;
end if;
return risultato;
end//
set #ultima_legge bigint;
set #ultimo_parlamentare varchar(16);
set #data_legge date;
drop trigger if exists Ultimo_Voto;
delimiter $$
create trigger Ultimo_Voto before insert on VOTO_PALESE
for each row
begin
set #ultima_legge = new.Legge;
set #ultimo_parlamentare = new.parlamentare;
set #data_legge = (select Data_Approvazione from LEGGI where Cod_Legge = new.Legge);
end $$
drop trigger if exists Controllo_Voto_Palese;
delimiter $$
create trigger Controllo_Voto_Palese after insert on VOTO_PALESE
for each row
BEGIN
IF Presente(#ultimo_parlamentare, #data_legge) = 0 THEN
delete from VOTO_PALESE where Legge = #ultima_legge AND Parlamentare = #ultimo_parlamentare;
END IF;
END $$
insert into VOTO_PALESE(Legge, Parlamentare, Voto) values(770, 'MSRMRC01C14L378X', 'astenuto');
when I run the code it gives me this error
Error Code: 1442. Can't update table 'voto_palese' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
I don't understand where the problem is
i am setting triggerafter_inser and i dont know how to resolve it
DELIMITER $$
USE `solocloud_dev_2`$$
DROP TRIGGER IF EXISTS table_10_summary_after_insert $$
CREATE TRIGGER table_10_summary_after_insert AFTER INSERT ON table_10
FOR EACH ROW BEGIN
DECLARE var INT;
SET var=0;
SELECT COUNT(*) FROM table_10_summary WHERE client_id = new.client_id;
IF var > 0
THEN
UPDATE table_10_summary SET records = records+1 WHERE client_id = new.client_id;
ELSE
INSERT INTO table_10_summary (new.client_id,1);
END$$
DELIMITER$$
There are several problems with your trigger :
you need to SET var from the results of the query ; as it is now, you are not setting this value
the IF block must be terminated with END IF
The following codes compiles successfully in this DB Fiddle :
DELIMITER $$
DROP TRIGGER IF EXISTS table_10_summary_after_insert $$
CREATE TRIGGER table_10_summary_after_insert AFTER INSERT ON table_10
FOR EACH ROW
BEGIN
DECLARE var INT;
SET var = (SELECT COUNT(*) FROM table_10_summary WHERE client_id = new.client_id);
IF (var > 0) THEN
UPDATE table_10_summary SET records = records + 1 WHERE client_id = new.client_id;
ELSE
INSERT INTO table_10_summary VALUES(new.client_id,1);
END IF;
END$$
DELIMITER ;
This is my trigger.
I want to make trigger on 1 table (rezervare).
Trigger
DELIMITER //
CREATE TRIGGER verificare_nr_locuri
BEFORE INSERT ON Rezervare
FOR EACH ROW
BEGIN
IF ( SELECT Masa.NrLocuri FROM Rezervare, Masa
WHERE Masa.NumarMasa = Rezervare.NumarMasa ) < Rezervare.NumarPersoane THEN
SET NEW.NumarMasa = NULL;
END IF;
END //
DELIMITER ;
INSERT INTO Rezervare VALUES (123,106,2,'2016-12-11','2016-12-24',5);
INSERT INTO Rezervare VALUES (124,106,2,'2016-12-11','2016-12-24',4);
When I execute the trigger, it has been created. But, when I insert data into table rezervare, It become
#1109 - Unknown table 'rezervare' in field list.
How can I resolve this?
Table
I think you might need to use a JOIN for your SELECT clause.
BEGIN
IF (SELECT Masa.NrLocuri, Rezervare.NumarMasa FROM Masa JOIN Rezervare
WHERE Masa.NumarMasa = Rezervare.NumarMasa) < Rezervare.NumarPersoane THEN
SET NEW.NumarMasa = NULL;
END IF;
SET SQL_SAFE_UPDATES = 0;
use my_database;
DELIMITER $$
DROP PROCEDURE IF EXISTS Comit $$
CREATE PROCEDURE Comit ()
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE ids INT;
DECLARE leftChilds INT;
DECLARE cur CURSOR FOR SELECT id FROM user;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur;
ins_loop: LOOP
FETCH cur INTO ids;
IF done THEN
LEAVE ins_loop;
END IF;
SET leftChilds = ( SELECT turnoverBalance FROM user WHERE proposer = ids AND side = 'left' LIMIT 1 );
INSERT INTO log(`log`) VALUES ( leftChilds );
END LOOP;
CLOSE cur;
END $$
When i call the procedure call Comit(); that return me this error :
1048 - Column 'log' cannot be null
Your subquery is generating NULL values, probably because there is no match on the proposer condition. Of course, your data could also have NULL values for turnoverBalance in user or rows with no 'left' side.
In any case, why are you using a cursor for something that is easily done as a single query? Something like this can replace all the logic:
INSERT INTO log(log)
SELECT turoverBalance
FROM user
WHERE proposer IN (SELECT id FROM user) AND side = 'left')
GROUP BY proposer;
First, its are stored procedure, not a trigger.
Check what your set leftChilds query returns, it should return some value, run it individually.
You can Check in stored procedure
If(leftChilds not NULL)
insert into log('log') values (leftChilds)
CREATE FUNCTION TWO_FRONT(txt CHAR(30))
RETURNS CHAR(2)
RETURN SUBSTRING(txt, 1, 2);
DELIMITER $$
CREATE FUNCTION CHECK_AVABILITY(t_nama CHAR(30))
RETURNS INT(4)
BEGIN
DECLARE vreturn INT(4);
DECLARE P CHAR(8);
SET p = (SELECT MAX(id) FROM tabel_user WHERE nama like CONCAT(TWO_FRONT(t_nama),'%'));
IF ISNULL(p)THEN
SET vreturn = 0;
ELSE
SET vreturn = SUBSTRING(p, 4, 4);
END IF;
RETURN vreturn;
END $$
DELIMITER;
CREATE FUNCTION COMBINE(fn CHAR(2), nu CHAR(4))
RETURNS CHAR(7)
RETURN CONCAT(UPPER(fn),'-',nu);
CREATE TRIGGER cast_id AFTER INSERT ON tabel_user
FOR EACH ROW
BEGIN
UPDATE tabel_user SET id = COMBINE(TWO_FRONT(OLD.nama),CHECK_AVABILITY(OLD.nama)) WHERE id = OLD.id;
END;
Everyting is okay but after i insert this...
INSERT INTO tabel_user VALUES('','Blabla');
error is coming...
ERROR 1442 (HY000): Can't update table 'tabel_user' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
Can you help me...
You're sending MySQL mixed messages.
cast_id fires after INSERT, but it is looking for OLD.nama and OLD.id. OLD, on the other hand, only exists when there is an UPDATE being called. I think you meant:
CREATE TRIGGER cast_id AFTER INSERT ON tabel_user
FOR EACH ROW
BEGIN
-- notice no "UPDATE" or "WHERE", "SET" implies "set on this current row"
SET NEW.id = COMBINE(TWO_FRONT(NEW.nama),CHECK_AVABILITY(NEW.nama));
END;