Insert new row into a table with values from another table mysql - mysql

Question

I'm new to triggers in MySQL, so sorry for any question that seems "really easy".
I have two tables: orders and orders_log
orders:
order_id
(...)
product_id
(...)
201
(...)
103
(...)
oders_log:
log_id
action
table_name
action_time
product_id
NULL
NULL
NULL
NULL
NULL
I want to create a trigger that when we INSERT a new row into "orders" table, it will generate a new row into orders_log with the log_id = 1...2..3... etc; and product_id = to product_id in table "orders". So that the orders_log would look like this:
log_id
action
table_name
action_time
product_id
1
insert
orders
"now()"
103
I'm trying to do this code:
DROP TRIGGER IF EXISTS addrowlog;
DELIMITER $$
CREATE TRIGGER addrowlog
AFTER INSERT ON orders
FOR EACH ROW
BEGIN
insert into orders_log (`log_id`, `action`, `table_name`, `action_time`, `product_id`)
VALUES (NEW.log_id, 'insert', 'orders', NOW(), NEW.product_id);
END$$
DELIMITER;
But is gaves this error: Error Code: 1054. Unknow column 'log_id' in 'NEW.
And even when i just do this code:
DROP TRIGGER IF EXISTS addrowlog;
DELIMITER $$
CREATE TRIGGER addrowlog
AFTER INSERT ON orders
FOR EACH ROW
BEGIN
insert into orders_log (`log_id`, `action`, `table_name`, `action_time`, `product_id`)
VALUES (log_id, 'insert', 'orders', NOW(), product_id);
END$$
DELIMITER;
When i try to add a row into 'orders' it will give me error "Cannot add or update a child row: a foreign key constraint fails".
Can someone help me?
*EDIT:
Creation of the log table:
CREATE TABLE `orders_log` (
`log_id` INTEGER NOT NULL,
`action` VARCHAR(255) DEFAULT NULL,
`table_name` VARCHAR(255) DEFAULT NULL,
`action_time` TIME DEFAULT NULL,
`product_id` INTEGER NOT NULL,
PRIMARY KEY (`log_id`)
);
(trigger created in the middle)
plus
ALTER TABLE `orders_log`
ADD CONSTRAINT `fk_orders_log_3`
FOREIGN KEY (`product_id`)
REFERENCES `product` (`product_id`)
ON DELETE RESTRICT
ON UPDATE CASCADE;
```*

Answer 1

After adding the auto_increment, you can remove the log_id from your insert or add NULL as value
CREATE TABLe orders (product_id int)
CREATE TABLE `orders_log` (
`log_id` INTEGER NOT NULL AUTO_INCREMENT,
`action` VARCHAR(255) DEFAULT NULL,
`table_name` VARCHAR(255) DEFAULT NULL,
`action_time` TIME DEFAULT NULL,
`product_id` INTEGER NOT NULL,
PRIMARY KEY (`log_id`)
);
CREATE TRIGGER addrowlog
AFTER INSERT ON orders
FOR EACH ROW
BEGIN
insert into orders_log ( `action`, `table_name`, `action_time`, `product_id`)
VALUES ( 'insert', 'orders', NOW(), new.product_id);
END
INSERt INTO orders VALUEs(1)
SELECT * FROM orders_log
log_id
action
table_name
action_time
product_id
1
insert
orders
12:10:43
1
fiddle