Unable to create a MySQL/MariaDB Stored Procedure - mysql

Question

I have a XML file which contains 200k records. I have to insert or update the records in the database. My database structure is as followed:
+----+------+-------+-----+-----+------------+
| Id | name | stock | sku | ean | updated_by |
+----+------+-------+-----+-----+------------+
For inserting the records i'm using Doctrine. But it takes to long before all records are inserted or updated. Therefore I want to create a stored procedure.
I tried the following stored procedure but it's not working.
delimiter $$
create trigger insert
before insert on Product
for each row
begin
IF(exists(select 1 From Product WHERE sku = new.sku))
THEN
BEGIN
UPDATE Product SET stock = new.stock WHERE sku = sku;
END;
END IF;
end$$
delimiter
Error:
General error: 1442 Can't update table 'Product' in stored
function/trigger because it is already used by statement which invoked
this stored function/trigger
Update:

Answer 1

You can't use a MySQL trigger in the way you describe. You can't update the table for which the trigger is defined. It would result in an infinite loop.
Even if the trigger code you wrote worked, MySQL does not support "instead of" triggers. That is, it would do the UPDATE but then it would also attempt the INSERT. So it would either create another row with the same sku value, or else if you have a unique constraint on sku, the insert would cause an error and roll back both the INSERT and the UPDATE run from the trigger.
This is why the REPLACE and INSERT...ON DUPLICATE KEY UPDATE statements exist.
I understand you want to use ORM methods for all operations, but this will be a good example of a general rule: ORM's do not support all operations. Inevitably you will encounter a case where you have to write SQL if you want to do something special. Doctrine, like all ORM libraries, supports a way to run literal SQL statements, bypassing the ORM methods.
See Doctrine: ON DUPLICATE KEY UPDATE for example.

Answer 2

You should use insert on duplicate
but your trigger should be li9ke this
your first insert must be the trigger name and the end is missing a ;
delimiter $$
create trigger insert_prodzct
before insert on Product
for each row
begin
IF(exists(select 1 From Product WHERE sku = new.sku))
THEN
BEGIN
UPDATE Product SET stock = new.stock WHERE sku = sku;
END;
END IF;
end$$
delimiter ;