mysql - 如何将值插入到两个内置外键关系的表中？

Question

如下所示的 2 个表结构（由 生成sequel pro）：

问题表：

CREATE TABLE `question` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `title` varchar(128) NOT NULL DEFAULT '',
  `content` text NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

答案表：

CREATE TABLE `answer` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `question_id` int(11) unsigned NOT NULL,
  `content` text NOT NULL,
  PRIMARY KEY (`id`),
  KEY `question_id` (`question_id`),
  CONSTRAINT `answer_ibfk_1` FOREIGN KEY (`question_id`) REFERENCES `question` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

现在，当我想插入答案时：

我可以做类似的事情：

INSERT INTO answer( content) JOIN question( title, content) VALUE('Ironman',"favourite characters","Avanger 中你最喜欢的角色是谁？");

或者有没有更好的方法来做类似的事情？

Answer 1

做到这一点的最好方法是以某种方式保留问题 id 并使用它来插入答案。如果没有其他方法，您可以执行以下操作：

INSERT INTO answer(content, question_id) 
VALUES('Ironman', (select id 
                     from question 
                    where title ='favourite characters' 
                      and content = 'Who is your favourite characters in Avanger?'));