MySQL 外键约束

Question

我无法弄清楚这个错误:

Cannot add or update a child row: a foreign key constraint fails (freight.rates_detail, CONSTRAINT rates_detail_ibfk_2 FOREIGN KEY (component_id) REFERENCES computation (id) ON UPDATE CASCADE)

这是我正在尝试做的(来自日志):

INSERT INTO freight.rates_detail(rate_id,component_id,uom,rate,inc_or) values(0821,01,00,011.00,'Y')

我反复查看和查看表 computation 中 id 的值以及该情况下的值:01 存在。

这有什么问题？

Answer 1

i just found out that the reference table is MyISAM not InnoDB will it affect?

是的。如 Using FOREIGN KEY Constraints 下所述:

The parent and child tables must use the same storage engine.

接着说:

For storage engines that do not support foreign keys (such as MyISAM), MySQL Server parses and ignores foreign key specifications.