如何执行MySQL UPSERT

Question

这就是我的表格。

CREATE TABLE `answers` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`basicinfo_id` INT(11) NOT NULL,
`question_id` INT(11) NOT NULL,
`answer` INT(11) NOT NULL,
PRIMARY KEY (`id`),
INDEX `question_id` (`question_id`),
INDEX `basicinfo_id` (`basicinfo_id`),
CONSTRAINT `basicinfo_id` FOREIGN KEY (`basicinfo_id`) REFERENCES `basic_info` (`id`) ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT `question_id` FOREIGN KEY (`question_id`) REFERENCES `questions` (`id`) ON UPDATE NO ACTION ON DELETE NO ACTION) COLLATE='latin1_swedish_ci' ENGINE=InnoDB AUTO_INCREMENT=3383;

这就是数据的样子

如果“basicinfo_id”已经存在，我想更新答案。 要么 如果我更改了question_id 1,2和3的答案。我怎样才能插入数据。？

我尝试过此查询，但不会更新结果。

INSERT INTO answers (basicinfo_id, question_id, answer) VALUES('98', 1, '1'),('98', 2, '1'),('98', 3, '1'),('98', 4, '1'),('98', 5, '1') ON DUPLICATE KEY UPDATE basicinfo_id = 98;

我现在已经定义了一个复合唯一键，这就是它的样子，但它仍然不起作用。

CREATE TABLE `answers` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`basicinfo_id` INT(11) NOT NULL,
`question_id` INT(11) NOT NULL,
`answer` INT(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE INDEX `basicinfo_id_question_id` (`basicinfo_id`, `question_id`),
INDEX `question_id` (`question_id`),
INDEX `basicinfo_id` (`basicinfo_id`),
CONSTRAINT `basicinfo_id` FOREIGN KEY (`basicinfo_id`) REFERENCES `basic_info` (`id`) ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT `question_id` FOREIGN KEY (`question_id`) REFERENCES `questions` (`id`) ON UPDATE NO ACTION ON DELETE NO ACTION ) COLLATE='latin1_swedish_ci' ENGINE=InnoDB AUTO_INCREMENT=3718;

Answer 1

ON DUPLICATE KEY UPDATE basicinfo_id = 98;格式错误

试试这个： ON DUPLICATE KEY UPDATE 'answer' = VALUES('answer');

如果已存在唯一键，则会更新answer字段