Mysql外键约束不起作用

Question

嗨,大家好,我只是在子表中创建父表的外键引用.当我尝试从父表中删除其子表中引用的行时,令人惊讶的是它允许我删除它.我试图通过写删除限制来创建子表,也没有它但没有帮助.任何想法为什么会这样？.Below是我在创建表时使用的代码.

CREATE TABLE region
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
);

CREATE TABLE aggregator
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
);

CREATE TABLE gateway
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL,
region_id int ,
aggregator_id int ,
is_public boolean  DEFAULT 0 NOT NULL,
FOREIGN KEY (region_id) REFERENCES region(id),
FOREIGN KEY (aggregator_id) REFERENCES aggregator(id)
);

Answer 1

父表和子表都需要是INNODB表.

尝试:

CREATE TABLE region
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
) ENGINE=INNODB;

CREATE TABLE aggregator
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
) ENGINE=INNODB;

CREATE TABLE gateway
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL,
region_id int ,
aggregator_id int ,
is_public boolean  DEFAULT 0 NOT NULL,
FOREIGN KEY (region_id) REFERENCES region(id),
FOREIGN KEY (aggregator_id) REFERENCES aggregator(id)
) ENGINE=INNODB;