MySQL錯誤＃1064

Question

當試圖下面創建觸發器，我得到這個消息

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '; END' at line 9 

是否有人可以幫忙嗎？謝謝

delimiter $$ 

CREATE TRIGGER tr_update_item_status 
AFTER UPDATE ON check_in 
FOR EACH ROW 
BEGIN 
    IF OLD.quantity > 0 AND NEW.quantity <= 0 THEN 
    UPDATE check_in SET item_status = 'Sold'; 
    ELSEIF OLD.quantity <= 0 AND NEW.quantity > 0 THEN 
    UPDATE check_in SET item_status = 'Available'; 
    ENDIF; 
END;$$ 

delimiter ; 

Answer 1

DELIMITER $$ 

CREATE TRIGGER tr_update_item_status 
AFTER UPDATE ON check_in 
FOR EACH ROW 
BEGIN 
    IF OLD.quantity > 0 AND NEW.quantity <= 0 THEN 
    UPDATE check_in SET item_status = 'Sold'; 
    ELSEIF OLD.quantity <= 0 AND NEW.quantity > 0 THEN 
    UPDATE check_in SET item_status = 'Available'; 
    END IF; 
END $$ 

DELIMITER ; 

這應該工作。祝一切順利。

Answer 2

DELIMITER $$ 

CREATE TRIGGER tr_update_item_status 
BEFORE UPDATE ON check_in 
FOR EACH ROW 
BEGIN 
    IF OLD.quantity > 0 AND NEW.quantity <= 0 THEN 
    SET NEW.item_status = 'Sold'; 
    ELSEIF OLD.quantity <= 0 AND NEW.quantity > 0 THEN 
    SET NEW.item_status = 'Available'; 
    END IF; 
END; $$ 

DELIMITER ; 

三（3）件事情：

• 的ENDIF;應該是END IF;
• 這應該是一個BEFORE UPDATE觸發器，因爲在任何表操作之前數據驗證更好
• UPDATE語句在語義上是錯誤的。我改變了他們設置新的列名，而不是