MySql - Sequalize - 无法添加外键约束

Question

我正在尝试使用Nodejs sequelize来创建数据库.被调用的命令是

CREATE TABLE IF NOT EXISTS `wheel` (`id` INTEGER NOT NULL auto_increment , `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `shopId` VARCHAR(255), PRIMARY KEY (`id`), 
FOREIGN KEY (`shopId`) REFERENCES `shop` (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS `segments` (`segmentID` VARCHAR(255) NOT NULL , `heading` VARCHAR(255) NOT NULL, `subHeading` VARCHAR(255) NOT NULL, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `wheelId` INTEGER, PRIMARY KEY (`segmentID`),
 FOREIGN KEY (`wheelId`) REFERENCES `wheel` (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS `shop` (`id` VARCHAR(255) NOT NULL , `accessToken` VARCHAR(255) NOT NULL, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB;

但是我得到了这个错误

未处理的拒绝SequelizeDatabaseError:ER_CANNOT_ADD_FOREIGN:无法添加外键约束

当我试图看到最后一个外键错误时,它说

------------------------
LATEST FOREIGN KEY ERROR
------------------------
2016-07-28 19:23:21 0x700000d95000 Error in foreign key constraint of table exitpopup/segments:
FOREIGN KEY (`wheelId`) REFERENCES `wheel` (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB:
Cannot resolve table name close to:
 (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB

奇怪的是,当我将sql语句放在sql控制台中时,它可以工作,并且没有任何错误.我究竟做错了什么 ？

Answer 1

顺序需要改变。您creatig的wheel表已经创建的前shop表。但是，wheel 指的是在您的原始查询集中不存在的商店表。当您更改订单时，商店表已经存在，因此不会发生错误。

CREATE TABLE IF NOT EXISTS `shop` 
 (`id` VARCHAR(255) NOT NULL , `accessToken` VARCHAR(255) NOT NULL, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, 
 PRIMARY KEY (`id`)) ENGINE=InnoDB;


CREATE TABLE IF NOT EXISTS `wheel` 
(`id` INTEGER NOT NULL auto_increment , `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `shopId` VARCHAR(255), 
 PRIMARY KEY (`id`), 
 FOREIGN KEY (`shopId`) REFERENCES `shop` (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS `segments` 
(`segmentID` VARCHAR(255) NOT NULL , `heading` VARCHAR(255) NOT NULL, `subHeading` VARCHAR(255) NOT NULL, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `wheelId` INTEGER, 
 PRIMARY KEY (`segmentID`),
 FOREIGN KEY (`wheelId`) REFERENCES `wheel` (`id`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB;