mysql - 错误 1215 (HY000) 在第 53 行 : Cannot add foreign key constraint Operation failed with exitcode 1

Question

这是我从 MySQL Workbench 生成的 sql 脚本:

SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';


-- -----------------------------------------------------
-- Schema mydb
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `mydb` DEFAULT CHARACTER SET utf8 ;
USE `mydb` ;

-- -----------------------------------------------------
-- Table `mydb`.`systems`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`systems` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`, `name`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`formats`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`formats` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`, `name`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`protocols`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`protocols` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`, `name`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`systems_protocol_format`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`systems_protocol_format` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `system` VARCHAR(45) NOT NULL,
  `protocol` VARCHAR(45) NOT NULL,
  `format` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`, `system`, `protocol`, `format`),
  CONSTRAINT FOREIGN KEY (`system`)
    REFERENCES `mydb`.`systems` (`name`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT FOREIGN KEY (`format`)
    REFERENCES `mydb`.`formats` (`name`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT FOREIGN KEY (`protocol`)
    REFERENCES `mydb`.`protocols` (`name`)
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB;

我似乎找不到错误。引用列的类型与外键相同，并且名称匹配...所有表创建查询的引擎也相同。

有人能指出我正确的方向吗？

Answer 1

您没有提供任何外键名称。

请检查此架构:

-- ----------------------------
-- Table structure for `formats`
-- ----------------------------
DROP TABLE IF EXISTS `formats`;
CREATE TABLE `formats` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  PRIMARY KEY (`id`,`name`),
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Table structure for `protocols`
-- ----------------------------
DROP TABLE IF EXISTS `protocols`;
CREATE TABLE `protocols` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  PRIMARY KEY (`id`,`name`),
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Table structure for `systems`
-- ----------------------------
DROP TABLE IF EXISTS `systems`;
CREATE TABLE `systems` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  PRIMARY KEY (`id`,`name`),
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Table structure for `systems_protocol_format`
-- ----------------------------
DROP TABLE IF EXISTS `systems_protocol_format`;
CREATE TABLE `systems_protocol_format` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `system` varchar(45) NOT NULL,
  `protocol` varchar(45) NOT NULL,
  `format` varchar(45) NOT NULL,
  PRIMARY KEY (`id`,`system`,`protocol`,`format`),
  KEY `FK_system` (`system`),
  KEY `FK_protocol` (`protocol`),
  KEY `FK_format` (`format`),
  CONSTRAINT `FK_format` FOREIGN KEY (`format`) REFERENCES `formats` (`name`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `FK_protocol` FOREIGN KEY (`protocol`) REFERENCES `protocols` (`name`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `FK_system` FOREIGN KEY (`system`) REFERENCES `systems` (`name`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;