添加外键约束失败。在参考表“ gyms”中缺少约束“ fk_gyms_instructors_gyms”的列“ gym_id”

时间：2019-06-07 23:41:23

标签： mysql error-handling mysql-workbench

我正在从我在MySqlWorkbench中创建的ERD向前工程数据库。我在“ gyms”表和“ instructors”表之间有一个非常基本的多对多关系，但是我遇到了上面的错误。对我来说，该错误表明MySql在尝试创建多对多表时无法在“ gyms”表中找到“ gym_id”列。 我不知道为什么会这样。

我仔细检查了表，以确保没有错别字，并且数据类型匹配。我还仔细查看了执行脚本，以确保在多对多之前创建了“ gyms”表。它是。我无法找出导致错误的原因。因此，我们将为您提供任何帮助或建议

这是错误：

Executing SQL script in server
ERROR: Error 3734: Failed to add the foreign key constraint. Missing column 'gym_id' for constraint 'fk_gyms_instructors_gyms' in the referenced table 'gyms'
SQL Code:
        -- -----------------------------------------------------
        -- Table `fitness`.`gyms_instructors`
        -- -----------------------------------------------------
        CREATE TABLE IF NOT EXISTS `fitness`.`gyms_instructors` (
          `id` INT NOT NULL AUTO_INCREMENT,
          `gym_id` SMALLINT NOT NULL,
          `instructor_id` SMALLINT NOT NULL,
          PRIMARY KEY (`id`),
          INDEX `fk_gyms_instructors_gyms_idx` (`gym_id` ASC) VISIBLE,
          INDEX `fk_gyms_instructors_instructors_idx` (`instructor_id` ASC) VISIBLE,
          CONSTRAINT `fk_gyms_instructors_gyms`
            FOREIGN KEY (`gym_id`)
            REFERENCES `fitness`.`gyms` (`gym_id`)
            ON DELETE NO ACTION
            ON UPDATE CASCADE,
          CONSTRAINT `fk_gyms_instructors_instructors`
            FOREIGN KEY (`instructor_id`)
            REFERENCES `fitness`.`instructors` (`instructor_id`)
            ON DELETE NO ACTION
            ON UPDATE CASCADE)
        ENGINE = InnoDB

SQL script execution finished: statements: 10 succeeded, 1 failed

Fetching back view definitions in final form.
Nothing to fetch

其他可能有用的信息是： 1.在多对多表中，在外键部分，gym_id和instructionor_id均为SMALLINTS和NOT NULL， 2.在它们各自的表上，gym_id和instructionor_id是自动递增的主键，NOT NULL 3.如果您想看的话，我在下面粘贴了完整的脚本。


-- MySQL Workbench Forward Engineering

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='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

-- -----------------------------------------------------
-- Schema fitness
-- -----------------------------------------------------

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

-- -----------------------------------------------------
-- Table `fitness`.`fitness_classes`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`fitness_classes` (
  `fitness_class_id` INT NOT NULL AUTO_INCREMENT,
  `title` VARCHAR(45) NOT NULL,
  `price` DECIMAL(2,2) NOT NULL,
  `description` VARCHAR(500) NOT NULL,
  `vacancies` INT NOT NULL,
  `start_time` DATETIME NOT NULL,
  PRIMARY KEY (`fitness_class_id`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`categories`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`categories` (
  `category_id` INT NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(45) NOT NULL,
  `description` TEXT(1200) NULL,
  PRIMARY KEY (`category_id`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`tags`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`tags` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `fitness_class_id` INT NOT NULL,
  `category_id` INT NOT NULL,
  PRIMARY KEY (`id`),
  INDEX `fk_tags_fitness_classes_idx` (`fitness_class_id` ASC) VISIBLE,
  INDEX `fk_tags_categories_idx` (`category_id` ASC) VISIBLE,
  CONSTRAINT `fk_tags_fitness_classes`
    FOREIGN KEY (`fitness_class_id`)
    REFERENCES `fitness`.`fitness_classes` (`fitness_class_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_tags_categories`
    FOREIGN KEY (`category_id`)
    REFERENCES `fitness`.`categories` (`category_id`)
    ON DELETE NO ACTION
    ON UPDATE CASCADE)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`gyms`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`gyms` (
  `gym_id` SMALLINT NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(55) NOT NULL,
  `address` VARCHAR(55) NOT NULL,
  `city` VARCHAR(25) NOT NULL,
  `state` VARCHAR(25) NOT NULL,
  `phone` VARCHAR(10) NOT NULL,
  `latitude` DECIMAL(10,8) NULL,
  `longitude` DECIMAL(10,8) NULL,
  `neighborhood` VARCHAR(45) NOT NULL,
  `create_time` TIMESTAMP NOT NULL,
  PRIMARY KEY (`gym_id`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`instructors`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`instructors` (
  `instructor_id` SMALLINT NOT NULL AUTO_INCREMENT,
  `first_name` VARCHAR(55) NOT NULL,
  `last_name` VARCHAR(55) NOT NULL,
  `create_time` TIMESTAMP NOT NULL,
  PRIMARY KEY (`instructor_id`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`gyms_instructors`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`gyms_instructors` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `gym_id` SMALLINT NOT NULL,
  `instructor_id` SMALLINT NOT NULL,
  PRIMARY KEY (`id`),
  INDEX `fk_gyms_instructors_gyms_idx` (`gym_id` ASC) VISIBLE,
  INDEX `fk_gyms_instructors_instructors_idx` (`instructor_id` ASC) VISIBLE,
  CONSTRAINT `fk_gyms_instructors_gyms`
    FOREIGN KEY (`gym_id`)
    REFERENCES `fitness`.`gyms` (`gym_id`)
    ON DELETE NO ACTION
    ON UPDATE CASCADE,
  CONSTRAINT `fk_gyms_instructors_instructors`
    FOREIGN KEY (`instructor_id`)
    REFERENCES `fitness`.`instructors` (`instructor_id`)
    ON DELETE NO ACTION
    ON UPDATE CASCADE)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`listings`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`listings` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `gym_id` SMALLINT NOT NULL,
  `fitness_class_id` INT NOT NULL,
  `instructor_id` SMALLINT NOT NULL,
  PRIMARY KEY (`id`),
  INDEX `fk_listings_gym_idx` (`gym_id` ASC) VISIBLE,
  INDEX `fk_listings_fitness_class_idx` (`fitness_class_id` ASC) VISIBLE,
  INDEX `fk_listings_instructor_idx` (`instructor_id` ASC) VISIBLE,
  CONSTRAINT `fk_listings_gym`
    FOREIGN KEY (`gym_id`)
    REFERENCES `fitness`.`gyms` (`gym_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_listings_fitness_class`
    FOREIGN KEY (`fitness_class_id`)
    REFERENCES `fitness`.`fitness_classes` (`fitness_class_id`)
    ON DELETE NO ACTION
    ON UPDATE CASCADE,
  CONSTRAINT `fk_listings_instructor`
    FOREIGN KEY (`instructor_id`)
    REFERENCES `fitness`.`instructors` (`instructor_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`users`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`users` (
  `user_id` INT NOT NULL AUTO_INCREMENT,
  `email` VARCHAR(255) NOT NULL,
  `password` VARCHAR(32) NOT NULL,
  `create_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `username` VARCHAR(16) NOT NULL,
  PRIMARY KEY (`user_id`));


-- -----------------------------------------------------
-- Table `fitness`.`reviews`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`reviews` (
  `review_id` INT NOT NULL AUTO_INCREMENT,
  `fitness_class_id` INT NOT NULL,
  `rating` TINYINT(1) NOT NULL,
  `review_text` TEXT(1200) NULL,
  `create_time` TIMESTAMP NOT NULL,
  PRIMARY KEY (`review_id`),
  INDEX `fk_reviews_classes_idx` (`fitness_class_id` ASC) VISIBLE,
  CONSTRAINT `fk_reviews_classes`
    FOREIGN KEY (`fitness_class_id`)
    REFERENCES `fitness`.`fitness_classes` (`fitness_class_id`)
    ON DELETE NO ACTION
    ON UPDATE CASCADE)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `fitness`.`bookings`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `fitness`.`bookings` (
  `booking_id` INT NOT NULL AUTO_INCREMENT,
  `fitness_class_id` INT NOT NULL,
  `user_id` INT NOT NULL,
  `price` DECIMAL(2,2) NOT NULL,
  `class_start_time` DATETIME NOT NULL,
  `purchase_date` DATETIME NOT NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`booking_id`),
  CONSTRAINT `user_id`
    FOREIGN KEY ()
    REFERENCES `fitness`.`users` ()
    ON DELETE NO ACTION
    ON UPDATE CASCADE,
  CONSTRAINT `fitness_class_id`
    FOREIGN KEY ()
    REFERENCES `fitness`.`fitness_classes` ()
    ON DELETE NO ACTION
    ON UPDATE CASCADE)
ENGINE = InnoDB;


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

0 个答案:

没有答案
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