Innodb重命名表导致关系问题

Question

我必须在大型innodb表上执行一些alter操作，我发现最好创建一个像旧表一样的表，然后改变它。我现在发现所有表仍然指旧表。要完全理解我的问题，请考虑以下问题

CREATE table books2 LIKE books;
ALTER TABLE `books2` DROP `not_needed_fields`;
INSERT INTO books2 (fields) SELECT fields FROM books;
RENAME TABLE books TO old_books;
RENAME TABLE books2 TO books;

book_id的所有外键都显示与old_books的关系我想将其更改为books表。我怎么能这样做？

Answer 1

您应该重新创建FK，例如 -

-- Drop FK that refers to old_books
ALTER TABLE child_table
  DROP FOREIGN KEY FK_books;

-- Add new FK
ALTER TABLE child_table
  ADD CONSTRAINT FK_books FOREIGN KEY (book_id)
    REFERENCES books(book_id);