How can I update table1 after update on table2? - mysql

DELIMITER $$
USE `gym`$$
DROP TRIGGER /*!50032 IF EXISTS */ `goods_input_total_amount-updateon-goods_input_price`$$
CREATE
/*!50017 DEFINER = 'root'#'localhost' */
TRIGGER `goods_input_total_amount-updateon-goods_input_price`
AFTER UPDATE ON `goods_input_price`
FOR EACH ROW BEGIN
DECLARE input_price INTEGER;
SELECT price_goods_input_price INTO input_price FROM goods_input_price
WHERE id_goods_input_price=NEW.id_goods_input_price LIMIT 1;
SET new.goods_input_total_amount=goods_input_quantity*input_price;
END;
$$
DELIMITER ;
I have this error message:
Error Code: 1362 Updating of NEW row is not allowed in after trigger


The message is pretty clear. If you want to update the row, you need a before update trigger:
DELIMITER $$
USE gym$$
DROP TRIGGER `goods_input_total_amount_updateon_goods_input_price`$$
CREATE TRIGGER `goods_input_total_amount_updateon_goods_input_price`
BEFORE UPDATE ON goods_input_price
FOR EACH ROW
BEGIN
DECLARE input_price INTEGER;
SELECT price_goods_input_price INTO input_price
FROM goods_input_price
WHERE id_goods_input_price = NEW.id_goods_input_price
LIMIT 1;
SET new.goods_input_total_amount = goods_input_quantityinput_price;
END; $$
DELIMITER ;
I would be inclined to write this as:
BEGIN
SELECT price_goods_input_price
INTO new.goods_input_total_amount
FROM goods_input_price
WHERE id_goods_input_price = NEW.id_goods_input_price
LIMIT 1;
END; $$

Related

Syntax error on my mysql trigger code. ERROR 1064 (42000):

I have below trigger code but It give me error. I can't figure out what is wrong with my code.
DROP TRIGGER IF EXISTS `user_has_voice_queues_rt_update`;
CREATE DEFINER=`root`#`localhost`
TRIGGER `user_has_voice_queues_rt_update`
BEFORE UPDATE ON `user_has_voice_queues_rt`
FOR EACH ROW begin
if(new.pause='0') then
Set new.penalty = (select max(penalty) from user_has_voice_queues_rt) + 1;
end if;

Try this:
DROP TRIGGER IF EXISTS `user_has_voice_queues_rt_update`;
DELIMITER $$
CREATE DEFINER=`root`#`localhost`
TRIGGER `user_has_voice_queues_rt_update`
BEFORE UPDATE ON `user_has_voice_queues_rt`
FOR EACH ROW begin
if(new.pause='0') then
Set new.penalty = (select max(penalty) from user_has_voice_queues_rt) + 1;
end if;
END $$
DELIMITER ;

Can I use the same trigger for insert and update?

DELIMITER $$
CREATE OR REPLACE
/*[DEFINER = { user | CURRENT_USER }]*/
TRIGGER `goods_input_total_amount-updateon-goods_input` BEFORE UPDATE
ON `gym`.`goods_input`
FOR EACH ROW BEGIN
DECLARE input_price INTEGER; /*use whatever datatype you have in your db for the price */
SELECT price_goods_input_price INTO input_price FROM goods_input_price
WHERE id_goods_input_price=NEW.id_goods_input_price LIMIT 1;
SET new.goods_input_total_amount=new.goods_input_quantity*input_price;
END$$
DELIMITER ;
The syntax is working for "before insert" trigger but I got this error message:
Error Code: 1064 You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right
syntax to use near 'TRIGGER
goods_input_total_amount-updateon-goods_input BEFORE UPDATE
ON `gy' at line 3

CREATE OR REPLACE TRIGGER is not there in MySQL
Try
DELIMITER $$
CREATE
TRIGGER `goods_input_total_amount-updateon-goods_input` BEFORE UPDATE
ON `gym`.`goods_input`
FOR EACH ROW BEGIN
DECLARE input_price INTEGER; /*use whatever datatype you have in your db for the price */
SELECT price_goods_input_price INTO input_price FROM goods_input_price
WHERE id_goods_input_price=NEW.id_goods_input_price LIMIT 1;
SET new.goods_input_total_amount=new.goods_input_quantity*input_price;
END$$
DELIMITER ;
If you want to delete an existing TRIGGER, use
DROP TRIGGER IF EXISTS Trigger_name
before the create trigger code

Create Trigger Mysql

After insert in the table Aluguel update field Status to busy.
Not work.
DELIMITER $$
CREATE TRIGGER Tgr_Status_Update AFTER INSERT
ON aluguel
FOR EACH ROW
BEGIN
UPDATE apartamento SET status_apart = busy
WHERE id_apart = apartamento_id_apart;
END$$
DELIMITER ;

you have to use new key word
DELIMITER $$ CREATE TRIGGER Tgr_Status_Update AFTER UPDATE
ON aluguel FOR EACH ROW
BEGIN UPDATE apartamento SET status_apart = new.busy
WHERE id_apart = new.apartamento_id_apart;
END$$ DELIMITER ;
---------------------------------------insert trigger -----------------
DELIMITER $$ CREATE TRIGGER Tgr_Status_Insert AFTER INSERT
ON aluguel FOR EACH ROW
BEGIN UPDATE apartamento SET status_apart = new.busy
WHERE id_apart = new.apartamento_id_apart;
END$$ DELIMITER ;

To refer to a column from the table you're inserting into, you need to use NEW.column_name.
And if busy is a string, you need to put it in quotes.
DELIMITER $$
CREATE TRIGGER Tgr_Status_Update AFTER INSERT
ON aluguel
FOR EACH ROW
BEGIN
UPDATE apartamento SET status_apart = 'busy'
WHERE id_apart = NEW.apartamento_id_apart;
END$$
DELIMITER ;
DEMO

Result consisted of more than one row after activating trigger

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.

How can I avoid an infinite loop of these trigger updates recursing?

I want to have the following 3 triggers:
#START TRIGGER
delimiter $$
CREATE TRIGGER `lastedited` AFTER UPDATE ON `eng-jap`
FOR EACH ROW
BEGIN
UPDATE `mrhowtos_main`.`eng`
SET `english` = new.eng WHERE `english` = old.eng;
UPDATE `mrhowtos_main`.`jap`
SET `japanese` = new.jap WHERE `japanese` = old.jap;
END;
$$
#START TRIGGER
delimiter $$
CREATE TRIGGER `lastedited2` AFTER UPDATE ON `eng`
FOR EACH ROW
BEGIN
UPDATE `mrhowtos_main`.`eng-jap`
SET `eng-jap`.`eng` = new.english WHERE `eng-jap`.`eng` = old.english;
END;
$$
#START TRIGGER
delimiter $$
CREATE TRIGGER `lastedited3` AFTER UPDATE ON `jap`
FOR EACH ROW
BEGIN
UPDATE `mrhowtos_main`.`eng-jap`
SET `eng-jap`.`jap` = new.japanese WHERE `eng-jap`.`jap` = old.japanese;
END;
$$
but before i even create them i see that there will be this infinite looping of the triggers as soon as any of the tables get updated. Basically i do not want the triggers UPDATE to "trigger" the other triggers. How do I do that?