Issue with execution query of update table in stored trigger - php

Question

I'm trying to execute this auto generate query from PHP but it's not working
INSERT INTO mvt (id_piece, article_id_article, code_mvt, origine_mvt, type_mvt, code_art, des_art, qte_old, qte_mvt, qte_new, link_piece)
SELECT
32,
57,
'MVT/15/12/0001',
'BSR/15/12/001',
'S',
'ART_039',
'AAAA',
a.qte_art,
1,
a.qte_art - 1,
'uuuu'
FROM article a
WHERE a.id_article = 57
Structure of table mvt
CREATE TABLE IF NOT EXISTS `mvt` (
`id_mvt` int(11) NOT NULL AUTO_INCREMENT,
`id_piece` int(10) NOT NULL,
`code_mvt` varchar(20) NOT NULL,
`origine_mvt` varchar(100) NOT NULL,
`date_mvt` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`type_mvt` varchar(20) NOT NULL,
`article_id_article` int(10) unsigned NOT NULL,
`code_art` varchar(20) NOT NULL,
`des_art` varchar(255) NOT NULL,
`qte_old` double NOT NULL,
`qte_mvt` double NOT NULL,
`qte_new` double NOT NULL,
`link_piece` varchar(255) NOT NULL,
PRIMARY KEY (`id_mvt`),
KEY `article_id_article` (`article_id_article`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=229 ;
Trigger of mvt
DROP TRIGGER IF EXISTS `before_insert_mvt`;
DELIMITER //
CREATE TRIGGER `before_insert_mvt` BEFORE INSERT ON `mvt`
FOR EACH ROW BEGIN
UPDATE article SET qte_art = NEW.qte_new WHERE id_article = NEW.article_id_article;
END
Structure of table article
CREATE TABLE IF NOT EXISTS `article` (
`id_article` int(10) unsigned NOT NULL AUTO_INCREMENT,
`famille_id_famille` int(10) unsigned NOT NULL,
`marque_id_marque` int(10) unsigned NOT NULL,
`tva_id_tva` int(10) unsigned NOT NULL,
`code_art` varchar(20) DEFAULT NULL,
`des_art` varchar(255) DEFAULT NULL,
`paht_art` double DEFAULT NULL,
`pamp_art` double DEFAULT NULL,
`qte_art` double DEFAULT NULL,
`seuil_alert` double NOT NULL,
`seuil_reap` double NOT NULL,
`date_modif` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`etat` int(11) NOT NULL DEFAULT '1',
PRIMARY KEY (`id_article`),
KEY `article_FKIndex1` (`tva_id_tva`),
KEY `article_FKIndex2` (`marque_id_marque`),
KEY `article_FKIndex3` (`famille_id_famille`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=82 ;
And this is sql error
#1442 - Can't update table 'article' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
it doesn't work!
What am I missing ?

Answer 1

The trigger is trying to update the same table that you're getting the inserted data from, and that's not allowed. You can do it in two steps with a temporary table.
CREATE TEMPORARY TABLE temp_mvt AS
SELECT
32,
57,
'MVT/15/12/0001',
'BSR/15/12/001',
'S',
'ART_039',
'AAAA',
a.qte_art,
1,
a.qte_art - 1,
'uuuu'
FROM article a
WHERE a.id_article = 57;
INSERT INTO mvt SELECT * FROM temp_mvt;
DROP TABLE temp_mvt;