更改外键表名称不能正确更新数据

Question

I have the following tables:

CREATE TABLE publishers
(
    name        VARCHAR(50)                         NOT NULL,
    status      TINYINT         DEFAULT 1           NOT NULL,
    CONSTRAINT publishers_pk PRIMARY KEY (name)
); 

CREATE TABLE titles
(
    id          INT                 NOT NULL    AUTO_INCREMENT,
    publisher   VARCHAR(50),
    title       VARCHAR(50)         NOT NULL,
    status      ENUM('active', 'announced', 'inactive'),
    discount    TINYINT             NOT NULL,
    CONSTRAINT title_pk PRIMARY KEY (id),
    CONSTRAINT title_fk FOREIGN KEY (publisher)
        REFERENCES publishers (name)
        ON DELETE   SET NULL
        ON UPDATE   CASCADE
);

When I change the "name" in publishers, it isn't changing the "publisher" in the titles table. Why is the behavior working this way?

Answer 1

Do you know what engine you are using? I read that MySQL with the default engine will parse the foreign key constraints but not actually do anything with them. Is it possible you're using the MyISAM engine?

http://dev.mysql.com/doc/refman/5.5/en/ansi-diff-foreign-keys.html