我无法编辑 table 另一个 table 在 mysql 中有它的外键

Question

这是我在 MySQL 中的 SQL 代码：

create table Table1
(
  id varchar(2),
  name varchar(2),
  PRIMARY KEY (id)
);


Create table Table1_Addr
(
  addid varchar(2),
  Address varchar(2),
  PRIMARY KEY (addid)
);

Create table Table1_sal
(
  salid varchar(2),
  addid varchar(2),
  id varchar(2),
  PRIMARY KEY (salid),
  index(addid),
  index(id),
  FOREIGN KEY (addid) REFERENCES Table1_Addr(addid),
  FOREIGN KEY (id) REFERENCES Table1(id)
)

Table1 和 Table1_Addr 是两个表，Table1_sal 有这两个表的两个外键。

我的问题是我无法更改 Table1 的 id 字段和 Table1_Addr

的 addid 字段

错误是：

#1451 - Cannot delete or update a parent row: a foreign key constraint
fails (`avl`.`table1_sal`, CONSTRAINT `table1_sal_ibfk_2` FOREIGN KEY (`id`)
REFERENCES `table1` (`id`))

编辑-答案是：

create table Table1
(
  id varchar(2),
  name varchar(2),
  PRIMARY KEY (id)
);


Create table Table1_Addr
(
  addid varchar(2),
  Address varchar(2),
  PRIMARY KEY (addid)
);

Create table Table1_sal
(
  salid varchar(2),
  addid varchar(2),
  id varchar(2),
  PRIMARY KEY (salid),
  index(addid),
  index(id),
  FOREIGN KEY (addid) REFERENCES Table1_Addr(addid)ON UPDATE CASCADE ON DELETE CASCADE,
  FOREIGN KEY (id) REFERENCES Table1(id)ON UPDATE CASCADE ON DELETE CASCADE
)

Answer 1

在您的外键定义后添加 ON UPATE CASCADE

    FOREIGN KEY (addid) REFERENCES Table1_Addr(addid) ON UPDATE CASCADE ON DELETE CASCADE,
  FOREIGN KEY (id) REFERENCES Table1(id) ON UPDATE CASCADE ON DELETE CASCADE

Answer 2

您无法更改 Table1 和 Table1_Addr 的主键的问题，作为 Table1_Addr 的外键，是关系数据库的正常行为，例如 MySQL、

Answer 3

您必须将外键设置为“更新时”cascade.Then所有子行也将被更新

     Create table Table1_sal
(
  salid varchar(2),
  addid varchar(2),
  id varchar(2),
  PRIMARY KEY (salid),
  index(addid),
  index(id),
  FOREIGN KEY (addid) REFERENCES Table1_Addr(addid) 
   On delete cascade On Update cascade ,
  FOREIGN KEY (id) REFERENCES Table1(id) 
   On delete cascade On Update cascade
)

我无法编辑 table 另一个 table 在 mysql 中有它的外键

I can't edit table that another table has a foreign key of it in mysql

mysql

sql

foreign-keys