如何在table2更新後更新table1？

Question

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 ; 

我有這樣的錯誤消息：

錯誤代碼：新行的1362更新觸發

Answer 1

的消息後，是不允許在是相當清楚的。如果你想更新的行，你需要一個前觸發更新：

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 ; 

我會傾向於寫爲：

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; $$