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;

但是我收到了这个错误

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

当我试图查看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。我做错了什么？

Answer 1

订单需要改变。在创建wheel表之前，您正在创建shop表。但是，wheel指的是在原始查询集中不存在的shop表。更改订单时，商店表已存在，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;

Answer 2

如果您需要关闭此检查，因为您要从另一个数据库的转储导入一堆表，您想要运行：

set FOREIGN_KEY_CHECKS=0

好像它是一个SQL语句。所以对我来说，在Sequelize中我跑了：

let promise = sequelize.query("set FOREIGN_KEY_CHECKS=0");

Answer 3

外键和原始键之间的char编码可能不同。检查您的架构。

Answer 4

这主要是由于以下两个原因

1。当主键数据类型和外键数据类型不匹配时。

return sequelize.define('Manager', {
    id: {
      type: DataTypes.INTEGER(11), // The data type defined here and 
      references: {
        model: 'User',
        key: 'id'
      }
    }
  }
)

return sequelize.define('User', {
    id: {
      type: DataTypes.INTEGER(11),  // This data type should be the same
    }
  }
)

2。当引用的键不是主键或唯一键时。

return sequelize.define('User', {
        id: {
          primaryKey: true  
        },
        mail: {
            type: DataTypes.STRING(45),
            allowNull: false,
            primaryKey: true   // You should change this to 'unique:true'. you cant have two primary keys in one table. 
        }
    }
)

MySql - Sequalize - 无法添加外键约束

4 个答案: