评论表、回复表设计

  CREATE TABLE `comment` (
   `id` varchar(50) NOT NULL,
   `issue_id` varchar(50) NOT NULL COMMENT \'笔记Id\',
   `user_id` varchar(50) NOT NULL COMMENT \'回复人\',
   `reply_msg` varchar(500) DEFAULT NULL COMMENT \'回复内容\',
   `create_date` datetime NOT NULL COMMENT \'创建时间\',
   `zan_count` int COMMENT \'赞数\',
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT=\'评论表\'
 
 CREATE TABLE `reply` (
   `id` varchar(50) NOT NULL,
   `comment_id` varchar(50) NOT NULL COMMENT \'评论Id\',
   `from_user_id` varchar(50) NOT NULL COMMENT \'回复人\',
   `to_user_id` varchar(50) NOT NULL COMMENT \'回复对象\',
   `reply_msg` varchar(500) DEFAULT NULL COMMENT \'回复内容\',
   `create_date` datetime NOT NULL COMMENT \'创建时间\',
   PRIMARY KEY (`id`),
   KEY `reply_fk1` (`comment_id`),
   CONSTRAINT `reply_fk1` FOREIGN KEY (`comment_id`) REFERENCES `comment` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT=\'回复表\'