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'