我无法将我的 SQL 表从 Adminer 导入 MySQL Workbench 而不会出现错误：第 9 行的错误 1215 (HY000)：无法添加外键约束

Posted 2023-03-23

【中文标题】我无法将我的 SQL 表从 Adminer 导入 MySQL Workbench 而不会出现错误：第 9 行的错误 1215 (HY000)：无法添加外键约束

【英文标题】：I can't import my SQL tables from Adminer to MySQL Workbench without getting error: ERROR 1215 (HY000) at line 9: Cannot add foreign key constraint

【发布时间】：2022-01-16 16:26:21

【问题描述】：

我正在尝试将我的 NodeJS 应用程序部署到 Heroku，并使用以下参数导出我的 MariaDB SQL 表：

Format: SQL
Tables: DROP+CREATE |Triggers

但是，当我导入它们时，我得到了一个模糊的错误：第 9 行的错误 1215 (HY000)：无法添加外键约束。这是我的 SQL 导出的一部分：

-- Adminer 4.6.3 mysql dump

SET NAMES utf8;
SET time_zone = '+00:00';

SET NAMES utf8mb4;

DROP TABLE IF EXISTS `Govt_answers`;
CREATE TABLE `Govt_answers` (
  `Answer_id` int(3) unsigned NOT NULL AUTO_INCREMENT,
  `Question_id` int(2) unsigned NOT NULL,
  `Correct` bit(1) NOT NULL,
  `Answer_prompt` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci NOT NULL,
  PRIMARY KEY (`Answer_id`),
  KEY `Question_id` (`Question_id`),
  CONSTRAINT `Govt_answers_ibfk_1` FOREIGN KEY (`Question_id`) REFERENCES `Govt_questions` (`Question_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


DROP TABLE IF EXISTS `Govt_choice_response`;
CREATE TABLE `Govt_choice_response` (
  `Quiz_id` int(2) unsigned NOT NULL,
  `Question_id` int(2) unsigned NOT NULL,
  `Answer_id` int(3) unsigned NOT NULL,
  `Correct` bit(1) DEFAULT NULL,
  `Time_start` datetime DEFAULT NULL,
  `Time_stop` datetime DEFAULT NULL,
  `Student_id` int(4) unsigned NOT NULL,
  KEY `Quiz_id` (`Quiz_id`),
  KEY `Question_id` (`Question_id`),
  KEY `Answer_id` (`Answer_id`),
  KEY `Student_id` (`Student_id`),
  CONSTRAINT `Govt_choice_response_ibfk_1` FOREIGN KEY (`Answer_id`) REFERENCES `Govt_answers` (`Answer_id`),
  CONSTRAINT `Govt_choice_response_ibfk_2` FOREIGN KEY (`Question_id`) REFERENCES `Govt_questions` (`Question_id`),
  CONSTRAINT `Govt_choice_response_ibfk_4` FOREIGN KEY (`Quiz_id`) REFERENCES `Govt_quizes` (`Quiz_id`),
  CONSTRAINT `Govt_choice_response_ibfk_5` FOREIGN KEY (`Question_id`) REFERENCES `Govt_questions` (`Question_id`),
  CONSTRAINT `Govt_choice_response_ibfk_6` FOREIGN KEY (`Answer_id`) REFERENCES `Govt_answers` (`Answer_id`),
  CONSTRAINT `Govt_choice_response_ibfk_7` FOREIGN KEY (`Student_id`) REFERENCES `Govt_profiles` (`Student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
....etc

我在我的 Raspberry Pi 上运行的外部服务器上尝试了 SHOW ENGINE INNODB STATUS，但它没有提供有关外键问题的任何见解。 任何想法是什么问题？

【参考方案1】：

我通过禁用外键检查然后再启用来解决这个问题。 这个post has more information。