Errno 121，写入或更新时重复键？

Question

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 `mydb` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci ;
USE `mydb` ;

-- -----------------------------------------------------
-- Table `mydb`.`restaurants`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `mydb`.`restaurants` (
  `id` INT NOT NULL AUTO_INCREMENT ,
  `name` VARCHAR(128) NOT NULL ,
  `description` VARCHAR(1024) NOT NULL ,
  `address` VARCHAR(1024) NOT NULL ,
  `phone` VARCHAR(16) NOT NULL ,
  `url` VARCHAR(128) NOT NULL ,
  `min_order` INT NOT NULL ,
  `food_types` SET('pizza', 'sushi', 'osetian_pie') NOT NULL ,
  PRIMARY KEY (`id`) ,
  UNIQUE INDEX `name_UNIQUE` (`name` ASC) ,
  UNIQUE INDEX `id_UNIQUE` (`id` ASC) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`regions`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `mydb`.`regions` (
  `id` INT NOT NULL AUTO_INCREMENT ,
  `restaurant` INT NOT NULL ,
  `name` VARCHAR(128) NOT NULL ,
  PRIMARY KEY (`id`) ,
  INDEX `restaurant_idx` (`restaurant` ASC) ,
  UNIQUE INDEX `id_UNIQUE` (`id` ASC) ,
  CONSTRAINT `restaurant`
    FOREIGN KEY (`restaurant` )
    REFERENCES `mydb`.`restaurants` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`food`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `mydb`.`food` (
  `id` INT NOT NULL ,
  `type` ENUM('pizza', 'sushi', 'osetian_pie') NOT NULL ,
  `name` VARCHAR(45) NOT NULL ,
  `ingredients` VARCHAR(256) NULL ,
  `image` VARCHAR(256) NOT NULL ,
  PRIMARY KEY (`id`) ,
  UNIQUE INDEX `id_UNIQUE` (`id` ASC) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `mydb`.`food_variant`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `mydb`.`food_variant` (
  `id` INT NOT NULL AUTO_INCREMENT ,
  `size` VARCHAR(16) NOT NULL ,
  `weight` VARCHAR(16) NOT NULL ,
  `price` INT NOT NULL ,
  `food` INT NOT NULL ,
  `restaurant` INT NOT NULL ,
  PRIMARY KEY (`id`) ,
  UNIQUE INDEX `id_UNIQUE` (`id` ASC) ,
  INDEX `food_idx` (`food` ASC) ,
  INDEX `restaurant_idx` (`restaurant` ASC) ,
  CONSTRAINT `food`
    FOREIGN KEY (`food` )
    REFERENCES `mydb`.`food` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `restaurant`
    FOREIGN KEY (`restaurant` )
    REFERENCES `mydb`.`restaurants` (`id` )
    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;

Error is:
    Executing SQL script in server
    ERROR: Error 1005: Can't create table 'mydb.food_variant' (errno: 121)

我看不到重复的约束。它在哪里？

Answer 1

这可能是因为您已命名至少一个具有与列相同的标识符的约束：

/* You already have a column named `restaurant` in this table, 
   but are naming the FK CONSTRAINT `restaurant` also... */
CONSTRAINT `restaurant`
    FOREIGN KEY (`restaurant` )
    REFERENCES `mydb`.`restaurants` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)

应该像fk_restaurant一样使用不同的约束标识符，如：

CONSTRAINT `fk_restaurant`
    FOREIGN KEY (`restaurant` )
    REFERENCES `mydb`.`restaurants` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)

在food表中同样的事情：

  /* Name it fk_food */
  CONSTRAINT `fk_food`
    FOREIGN KEY (`food` )
    REFERENCES `mydb`.`food` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  /* Name it fk_restaurant */
  CONSTRAINT `fk_restaurant`
    FOREIGN KEY (`restaurant` )
    REFERENCES `mydb`.`restaurants` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)

这是我看到的唯一三个，但可能还有其他我错过了。

Answer 2

这个答案来自@Michael Berkowski的the comment to the answer。我发布它作为答案，因为它实际上对我有用：

即使在跨多个表更改约束名称后，我也得到了errno 121。问题是，即使在不同的表中，您也不能拥有相同的约束名称。我在fk_entryid和table1使用table2，并分别将它们更改为fk_table1_entryid和fk_table2_entryid以使其工作。

Answer 3

上面的所有答案都很棒，但即使在我删除了所有表之后也没有解决我的问题，但是一切都运行良好，我删除了我的数据库并再次创建它后迁移顺利运行....看起来密钥被缓存了删除表后不会清除。

注意：这不是问题的答案，但我觉得我的经验可能会帮助另一个人。