I've created this trigger, but I have two problems. One it does not actively populate the Person table and two. If I enter more than one row into my Party table I get an error in access, Result of Subquery returns more than one row.
Anybody know my problem(s)?
DELIMITER $$
Create TRIGGER Trigger1
AFTER
INSERT
ON Party
FOR EACH ROW
BEGIN
declare partytypeid int;
declare partyid int;
set #partyid:= (select partyid from party);
set #partytypeid:= (select partytypeid from party);
IF partytypeid = 1
THEN INSERT INTO Person
(PartyId) VALUES (PartyId);
END IF;
END$$
delimiter ;
When you set your variables, you're doing a select against the whole table instead of the inserted record.
DELIMITER $$
Create TRIGGER Trigger1
AFTER INSERT ON Party FOR EACH ROW
BEGIN
declare partytypeid int;
declare partyid int;
set #partyid:= new.partyid;
set #partytypeid:= new.partytypeid;
IF partytypeid = 1 THEN
INSERT INTO Person
(PartyId) VALUES (PartyId);
END IF;
END$$
delimiter ;
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 have 3 tables named opproduct, opcategory and opproduct_to_category.The opproduct table has an after insert and an after delete trigger. These triggers modify the category table content column, but it gets the category_id trough opproduct_to_category table. The statments of triggers roughly the same. The after update is working well, but after insert doesn't modify the category table.
Thanks for your answers!
DROP TRIGGER IF EXISTS opproduct_AINS;
DELIMITER $$
CREATE TRIGGER `opproduct_AINS` AFTER INSERT ON `opproduct`
FOR EACH ROW BEGIN
DECLARE _category_id INT;
IF new.`status`='1' THEN
SELECT category_id INTO _category_id
FROM opproduct_to_category
WHERE product_id = NEW.product_id;
UPDATE opcategory
SET content = content+1
WHERE category_id=_category_id;
END IF;
END$$
DELIMITER ;
DROP TRIGGER IF EXISTS opproduct_AUPD;
DELIMITER $$
CREATE TRIGGER `opproduct_AUPD` AFTER UPDATE ON `opproduct`
FOR EACH ROW BEGIN
DECLARE _category_id INT;
IF NEW.`status`<> OLD.`status` AND NEW.`status`=1 THEN
SELECT category_id INTO _category_id
FROM opproduct_to_category
WHERE product_id = NEW.product_id;
UPDATE opcategory SET content = content+1
WHERE category_id=_category_id;
ELSEIF NEW.`status`<> OLD.`status` AND NEW.`status`=0 THEN
SELECT category_id INTO _category_id
FROM opproduct_to_category
WHERE product_id = NEW.product_id;
UPDATE opcategory SET content = content-1
WHERE category_id=_category_id;
END IF;
END$$
DELIMITER ;
procedure:
DELIMITER //
CREATE PROCEDURE sample_proc(IN wr VARCHAR(255))
BEGIN
SELECT some_function_with_result_code_int();
END;//
DELIMITER ;
and a trigger:
DELIMITER //
CREATE TRIGGER sample_trigger
AFTER UPDATE ON test
FOR EACH ROW
BEGIN
DECLARE some_name VARCHAR(255);
IF OLD.age <> NEW.age THEN
SELECT name INTO some_name FROM test WHERE OLD.age <> NEW.age;
CALL sample_proc(some_name);
END IF;
END;//
DELIMITER ;
Can't understand how updating only one row's column "age" could result in multiple row change...Any help will be appreciated.
I have two table 'testing1' with fields 'firstname' and 'lastname'. Another table 'testing2' with field 'firstname'.
So the trigger checks first whether the 'NEW.firstname' exists in 'testing2' table or not. If it does then it doesn't execute the INSERT query but if it doesn't exist then the INSERT query is executed and 'NEW.firstname' is added in 'testing2' table.
Here's the trigger that i created ... but I'm getting error in the IF loop ...
DELIMITER $$;
CREATE TRIGGER testRef AFTER INSERT ON testing1
FOR EACH ROW
BEGIN
DECLARE rowCount INTEGER;
SET #rowCount := ( SELECT COUNT(firstname) FROM testing2 WHERE testing2.firstname = NEW.firstname );
IF (rowCount)
INSERT INTO testing2 (firstname) VALUES (NEW.firstname);
END $$
I'm unable to figure out where did I made the mistake... Any help ??
Try
DELIMITER $$;
CREATE TRIGGER testRef AFTER INSERT ON testing1
FOR EACH ROW
BEGIN
DECLARE rowCount INTEGER;
SET #rowCount := ( SELECT COUNT(firstname) FROM testing2 WHERE testing2.firstname = NEW.firstname );
IF (rowCount) THEN
INSERT INTO testing2 (firstname) VALUES (NEW.firstname);
END IF;
END$$
DELIMITER ;
But maybe you shoud use IF (rowCount)>0
This worked for me :
DELIMITER //
CREATE TRIGGER testRef AFTER INSERT ON testing1
FOR EACH ROW
BEGIN
DECLARE rowCount INTEGER;
SELECT COUNT(firstname) FROM testing2 WHERE testing2.firstname = NEW.firstname INTO rowCount;
IF rowCount = 0 THEN
INSERT INTO testing2 (firstname) VALUES (NEW.firstname);
END IF;
END //
DELIMITER ;
I have a problem with a MySQL Trigger.
I have 3 tables Customers, Products and Sales.
In Sales I reference customer and product and I want to update the some counts on Products and Customers after a new sale is inserted.
The following trigger fails to update both tables... I cannot figure out what I am doing wrong.
DELIMITER $
CREATE TRIGGER OnSalesInsert AFTER INSERT ON Sales
FOR EACH ROW BEGIN
UPDATE Products SET Products.sold=Products.sold+NEW.amount WHERE Products.id=NEW.product_id;
UPDATE Customers SET Customers.amount=Customers.amount+NEW.amount WHERE Customers.id=NEW.customer_id;
END $
DELIMITER ;
Try this:
DELIMITER $$
CREATE
/*!50017 DEFINER = 'root'#'%' */
TRIGGER `OnSalesInsert` BEFORE INSERT ON `Sales`
FOR EACH ROW BEGIN
UPDATE Products
SET sold = sold + new.amount
WHERE id = new.product_id;
UPDATE Customers
SET amount = amount + new.amount
WHERE id = new.customer_id;
END;
$$
DELIMITER ;
DELIMITER $$
create trigger UpdateAvail after insert on product_details
for each row
Begin
Declare a1 INT;
Declare d1 VARCHAR(1);
Declare d2 VARCHAR(100);
Select count(0) INTO a1 from prod_available where P_Id=new.P_Id;
Select P_Name,P_Brand INTO d1,d2 from product where P_Id=new.P_Id;
IF a1>0 THEN
Update prod_available set P_quantity=P_quantity+new.quantity where P_Id=new.P_Id;
ELSE
insert into prod_available (P_Id,P_Name,P_Brand,P_quantity) values (new.P_Id,d1,d2,new.quantity);
END IF;
END;
$$
DELIMITER ;