MySQL两次引用相同的外键

Question

尝试进行一些数据建模。 我正在尝试在“游戏”，“比赛”和“转弯”表中跟踪两个机器人。 这些机器人在Bots表中列出，在上述三个表中，foreign键需要出现两次（每个机器人一次）。

该数据库旨在记录两个AI相互竞争的结果

不知道这对模型是否是好的做法，但是在尝试实现此方法时，我收到错误编号：150。不了解如何解决此问题。 任何帮助和建议，将不胜感激。 下面列出了SQL代码。

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';

CREATE SCHEMA IF NOT EXISTS `battleship` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;
USE `battleship` ;

-- -----------------------------------------------------
-- Table `battleship`.`Security`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Security` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Security` (
  `SecurityID` INT NOT NULL ,
  `Level` VARCHAR(45) NULL ,
  `Description` VARCHAR(200) NULL ,
  PRIMARY KEY (`SecurityID`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Users`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Users` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Users` (
  `UserID` INT NOT NULL ,
  `Username` VARCHAR(45) NULL ,
  `First_name` VARCHAR(45) NULL ,
  `Last_name` VARCHAR(45) NULL ,
  `Email` VARCHAR(45) NULL ,
  `Student Number` INT NULL ,
  `Enabled` BINARY NULL ,
  `SecurityID` INT NOT NULL ,
  PRIMARY KEY (`UserID`) ,
  INDEX `fk_Users_Security_idx` (`SecurityID` ASC) ,
  CONSTRAINT `fk_Users_Security`
    FOREIGN KEY (`SecurityID` )
    REFERENCES `battleship`.`Security` (`SecurityID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`News`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`News` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`News` (
  `EventID` INT NOT NULL ,
  `Event_Name` VARCHAR(45) NULL ,
  `Event_Date` DATETIME NULL ,
  `Event_Description` VARCHAR(45) NULL ,
  `UserID` INT NOT NULL ,
  PRIMARY KEY (`EventID`, `UserID`) ,
  INDEX `fk_News_Users1_idx` (`UserID` ASC) ,
  CONSTRAINT `fk_News_Users1`
    FOREIGN KEY (`UserID` )
    REFERENCES `battleship`.`Users` (`UserID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Bots`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Bots` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Bots` (
  `BotID` INT NOT NULL ,
  `Name` VARCHAR(45) NULL ,
  `UserID` INT NOT NULL ,
  `Revision` INT NULL ,
  `SubmissionDate` DATETIME NULL ,
  `Approved` BINARY NULL ,
  PRIMARY KEY (`BotID`, `UserID`) ,
  INDEX `fk_Bots_Users1_idx` (`UserID` ASC) ,
  CONSTRAINT `fk_Bots_Users1`
    FOREIGN KEY (`UserID` )
    REFERENCES `battleship`.`Users` (`UserID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Competitions`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Competitions` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Competitions` (
  `CompetitionsID` INT NOT NULL ,
  `CompetitionName` VARCHAR(45) NULL ,
  `Description` VARCHAR(45) NULL ,
  `Date` VARCHAR(45) NULL ,
  PRIMARY KEY (`CompetitionsID`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Matches`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Matches` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Matches` (
  `MatchID` INT NOT NULL ,
  `Winner` VARCHAR(45) NULL ,
  `Bots_BotID1` INT NOT NULL ,
  `Bots_BotID2` INT NOT NULL ,
  `CompetitionsID` INT NOT NULL ,
  PRIMARY KEY (`MatchID`) ,
  INDEX `fk_Matches_Bots1_idx` (`Bots_BotID1` ASC, `Bots_BotID2` ASC) ,
  INDEX `fk_Matches_Competitions1_idx` (`CompetitionsID` ASC) ,
  CONSTRAINT `fk_Matches_Bots1`
    FOREIGN KEY (`Bots_BotID1` , `Bots_BotID2` )
    REFERENCES `battleship`.`Bots` (`BotID` , `BotID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Matches_Competitions1`
    FOREIGN KEY (`CompetitionsID` )
    REFERENCES `battleship`.`Competitions` (`CompetitionsID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Entrants`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Entrants` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Entrants` (
  `EntryID` INT NOT NULL ,
  `Bots_BotID` INT NOT NULL ,
  `Competitions_CompetitionsID` INT NOT NULL ,
  PRIMARY KEY (`EntryID`) ,
  INDEX `fk_Entrants_Bots1_idx` (`Bots_BotID` ASC) ,
  INDEX `fk_Entrants_Competitions1_idx` (`Competitions_CompetitionsID` ASC) ,
  CONSTRAINT `fk_Entrants_Bots1`
    FOREIGN KEY (`Bots_BotID` )
    REFERENCES `battleship`.`Bots` (`BotID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Entrants_Competitions1`
    FOREIGN KEY (`Competitions_CompetitionsID` )
    REFERENCES `battleship`.`Competitions` (`CompetitionsID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Games`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Games` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Games` (
  `GameID` INT NOT NULL ,
  `Matches_MatchID` INT NOT NULL ,
  `Bots_BotID1` INT NOT NULL ,
  `Bots_BotID2` INT NOT NULL ,
  `Winner` VARCHAR(45) NULL ,
  PRIMARY KEY (`GameID`) ,
  INDEX `fk_Games_Matches1_idx` (`Matches_MatchID` ASC) ,
  INDEX `fk_Games_Bots1_idx` (`Bots_BotID1` ASC, `Bots_BotID2` ASC) ,
  CONSTRAINT `fk_Games_Matches1`
    FOREIGN KEY (`Matches_MatchID` )
    REFERENCES `battleship`.`Matches` (`MatchID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Games_Bots1`
    FOREIGN KEY (`Bots_BotID1` , `Bots_BotID2` )
    REFERENCES `battleship`.`Bots` (`BotID` , `BotID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `battleship`.`Turns`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `battleship`.`Turns` ;

CREATE  TABLE IF NOT EXISTS `battleship`.`Turns` (
  `TurnID` INT NOT NULL ,
  `Bots_BotID1` INT NOT NULL ,
  `Bots_BotID2` INT NOT NULL ,
  `Bot1Move` VARCHAR(45) NULL ,
  `Bot2Move` VARCHAR(45) NULL ,
  `ThinkingTime` VARCHAR(45) NULL ,
  `Turnscol` VARCHAR(45) NULL ,
  `Games_GameID` INT NOT NULL ,
  PRIMARY KEY (`TurnID`) ,
  INDEX `fk_Turns_Bots1_idx` (`Bots_BotID1` ASC, `Bots_BotID2` ASC) ,
  INDEX `fk_Turns_Games1_idx` (`Games_GameID` ASC) ,
  CONSTRAINT `fk_Turns_Bots1`
    FOREIGN KEY (`Bots_BotID1` , `Bots_BotID2` )
    REFERENCES `battleship`.`Bots` (`BotID` , `BotID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Turns_Games1`
    FOREIGN KEY (`Games_GameID` )
    REFERENCES `battleship`.`Games` (`GameID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

USE `battleship` ;


SET SQL_MODE=@OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;

Answer 1

认为我在这里对模型进行了修改后找到了可行的解决方案。

我定义了很多对很多的关系，最终创建了3个以上的表来将机器人与转弯，游戏和比赛相联系。 下面是该模型的更新屏幕快照，以进行说明。

针对mysql运行它，它接受了它而没有错误。 干杯