Question

我在桌面上设置了触发器＆quot; purchase_invoice＆＃39;这应该为＆quot; purchase_stock＆＃39;中的发票项目添加相应的股票交易。在＆＃39; stock＆＃39;中更新其库存单位并进行更新。表：

CREATE TRIGGER addStock AFTER INSERT ON purchase_invoice
FOR EACH ROW

    INSERT INTO 
    purchase_stock
    (
       purchase_invoice_id,
       item_id,
       units,
       ...
    )
    VALUES
    (
       NEW.id,
       NEW.item_id,
       NEW.units
       ...
    );

    UPDATE 
       stock 
    SET 
       units = units + NEW.units 
    WHERE 
       item_id = NEW.item_id;
...

但我收到以下错误：

Unknown column 'NEW.units'   in field list
Unknown column 'NEW.item_id' in 'where clause'

Answer 1

BEGIN之后没有FOR EACH ROW，因此mysql解释只使用单个insert语句定义触发器并分别考虑update语句。这就是您收到错误消息的原因。显然，您也错过了相应的END。

正确的代码如下所示：

DELIMITER \\
CREATE TRIGGER addStock AFTER INSERT ON purchase_invoice
FOR EACH ROW
BEGIN
    INSERT INTO 
    purchase_stock
    (
       purchase_invoice_id,
       item_id,
       units,
       ...
    )
    VALUES
    (
       NEW.id,
       NEW.item_id,
       NEW.units
       ...
    );
    UPDATE 
       stock 
    SET 
       units = units + NEW.units 
    WHERE 
       item_id = NEW.item_id;
    ...
END\\

DELIMITER ;

MySQL触发器在后续查询中没有识别NEW.entity？

1 个答案: