MySql - Sequalize - 無法添加外鍵約束

Question

我正在嘗試使用Nodejs sequelize創建數據庫。被調用的命令是

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; 

但我得到這個錯誤

Unhandled rejection SequelizeDatabaseError: ER_CANNOT_ADD_FOREIGN: Cannot add foreign key constraint

當我嘗試，看看在過去的外鍵錯誤，它說

------------------------ 
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，當我把SQL控制檯中的sql語句，它的工作原理並沒有任何錯誤。 我在做什麼錯？

Answer 1

訂單需要更改。在創建shop表之前，您正在創建wheel表。但是，輪子是指您的原始查詢集中不存在的商店表。當您更改訂單時，商店表已經存在，因此不會發生錯誤。

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;