如何保存在觸發

Question

JSON值，我們創建一個觸發器

CREATE TRIGGER `insert_category` AFTER INSERT ON `cleaner_service` 
FOR EACH ROW UPDATE users 
    SET user_category = (select group_concat(concat(service_id) SEPARATOR '-') from cleaner_service where users.id=cleaner_service.user_id) 
WHERE users.id=NEW.user_id 

它儲值像8-7-9這個我想這個值存儲在JSON [「1」，「2 」， 「3」]，你能告訴我怎麼做，在MYSQL

請幫

Answer 1

嘗試：

SET user_category = concat("[",(select group_concat(concat(service_id) SEPARATOR ','),"]") from cleaner_service where users.id=cleaner_service.user_id)