如何在更新之前触发 MYSQL 删除条目
我有一个两个表，主表是“Invoice”，子表是“Invoice_split”。 在更新“Invoice”表之前，我想删除子表“Invoice_split”上的相关数据，因为我已经编写了以下查询，但它不起作用。
"DELIMITER $$
CREATE TRIGGER before_invoice_update
BEFORE UPDATE ON mac_invoice FOR EACH ROW
BEGIN
DELETE FROM mac_invoice_split WHERE OLD.invoice_id = id;
END$$
DELIMITER ;"
id => "Invoice" table primary key
invoice_id =>foreign key of "Invoice" in "Invoice_split" table
I have an Two table, main table is "Invoice" and sub table is "Invoice_split".
Before update on the "Invoice" table I want to delete the related data on the sub table "Invoice_split" for that I have written the below query But it's not working.
"DELIMITER $
CREATE TRIGGER before_invoice_update
BEFORE UPDATE ON mac_invoice FOR EACH ROW
BEGIN
DELETE FROM mac_invoice_split WHERE OLD.invoice_id = id;
END$
DELIMITER ;"
id => "Invoice" table primary key
invoice_id =>foreign key of "Invoice" in "Invoice_split" table
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你应该试试这个
you should try this