Mysql 正向工程 sql 重复的外键约束

Question

我不太了解 SQL，我是通过 MySQL Workbench 使用建模生成的。当我尝试导入通过 workbench 的正向工程生成的 SQL 时，我总是得到 Error Code: 1826. Duplicate foreign key constraint name 'post_id'。如果有人能让我出去。我不是从头开始编写代码。我刚刚制作了一个 ERD 并生成了一个 SQL.

附加信息，错误在此行触发

CREATE TABLE IF NOT EXISTS testing.post_likes ...

此外，MySQL Workbench 和服务器都是 8.0.19 版本

这里是生成的SQL

-- MySQL Script generated by MySQL Workbench
-- Tue Mar 31 21:51:19 2020
-- Model: New Model    Version: 1.0
-- 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 testing
-- -----------------------------------------------------

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

-- -----------------------------------------------------
-- Table `testing`.`users`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `testing`.`users` (
  `userid` DOUBLE NOT NULL,
  `username` VARCHAR(100) NULL,
  `email` VARCHAR(100) NULL,
  `name` VARCHAR(100) NULL,
  `handle` VARCHAR(45) NULL,
  `quote` LONGTEXT NULL,
  `last_updated` DATE NULL,
  PRIMARY KEY (`userid`))
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `testing`.`posts`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `testing`.`posts` (
  `post_id` DOUBLE NOT NULL,
  `user_id` DOUBLE NOT NULL,
  `description` LONGTEXT NULL,
  `images` LONGTEXT NULL,
  `tags` LONGTEXT NULL,
  `last_updated` DATE NULL,
  PRIMARY KEY (`post_id`),
  INDEX `user_id_idx` (`user_id` ASC) VISIBLE,
  CONSTRAINT `user_id`
    FOREIGN KEY (`user_id`)
    REFERENCES `testing`.`users` (`userid`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `testing`.`comments`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `testing`.`comments` (
  `comment_id` DOUBLE NOT NULL,
  `post_id` DOUBLE NOT NULL,
  `description` LONGTEXT NULL,
  `images` LONGTEXT NULL,
  `last_updated` DATE NULL,
  PRIMARY KEY (`comment_id`),
  INDEX `post_id_idx` (`post_id` ASC) VISIBLE,
  CONSTRAINT `post_id`
    FOREIGN KEY (`post_id`)
    REFERENCES `testing`.`posts` (`post_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `testing`.`post_likes`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `testing`.`post_likes` (
  `plike_id` DOUBLE NOT NULL,
  `post_id` DOUBLE NOT NULL,
  `user_id` DOUBLE NOT NULL,
  `type` INT NULL,
  PRIMARY KEY (`plike_id`),
  INDEX `post_id_idx` (`post_id` ASC) VISIBLE,
  INDEX `user_id_idx` (`user_id` ASC) VISIBLE,
  CONSTRAINT `post_id`
    FOREIGN KEY (`post_id`)
    REFERENCES `testing`.`posts` (`post_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `user_id`
    FOREIGN KEY (`user_id`)
    REFERENCES `testing`.`users` (`userid`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `testing`.`comment_likes`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `testing`.`comment_likes` (
  `clike_id` DOUBLE NOT NULL,
  `comment_id` DOUBLE NOT NULL,
  `user_id` DOUBLE NOT NULL,
  `type` INT NULL,
  PRIMARY KEY (`clike_id`),
  INDEX `comment_id_idx` (`comment_id` ASC) VISIBLE,
  INDEX `user_id_idx` (`user_id` ASC) VISIBLE,
  CONSTRAINT `comment_id`
    FOREIGN KEY (`comment_id`)
    REFERENCES `testing`.`comments` (`comment_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `user_id`
    FOREIGN KEY (`user_id`)
    REFERENCES `testing`.`users` (`userid`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


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

Answer 1

根据与@P.Salmon 的讨论，指出 FK 名称重复。所以我通过 ERD 调整了 FK 名称，并生成了一个新的 SQL 文件。所以基本上，我调整了避免使用相同的 FK 名称，瞧，它起作用了。

见下文

Mysql 正向工程 sql 重复的外键约束

Mysql forward engineered sql duplicate foreign key constraints

mysql

database

mysql-8.0