如您的例外所述:

DROP TABLE IF EXISTS `link`; nested exception is java.sql.SQLException: Cannot drop table 'link' referenced by a foreign key constraint 'FK336ctjyksuuwnpmffcogcdyet' on table 'vote'.

首先应该重新创建 vote 表，然后才能重新创建 link 表.

you should at first recreate the vote table and only after that you can recreate the link table.