Question

我正在尝试创建一个跨数据库外键。当我在同一个数据库上运行以下代码时

CREATE TABLE `t1` (
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  `int_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `int_id` (`int_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `ext_id` (`ext_id`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

但是，当在一个数据库（d1）上创建t1然后在第二个数据库（d2）上运行以下代码时，我收到一般错误：＃1005 - 无法创建表'userdata.t2' （错误：150）

CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `ext_id` (`ext_id`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `d1.t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

任何帮助将不胜感激。谢谢！

Answer 1

您的语法不正确，请尝试此操作

CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `ext_id` (`ext_id`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `d1`.`t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

Mysql跨数据库外键

1 个答案: