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?
答案 0 :(得分:27)
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)
应为fk_restaurant
之类的约束使用不同的标识符,如:
CONSTRAINT `fk_restaurant`
FOREIGN KEY (`restaurant` )
REFERENCES `mydb`.`restaurants` (`id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
同样的事情在food
表中:
/* 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。
答案 1 :(得分:2)
此答案来自@Michael Berkowski的the comment to the answer。我将其发布为答案,因为它实际上对我有用:
即使更改约束名称,我也得到了errno 121 跨多个表。问题是,即使跨越不同 表不能具有相同的约束名称。我在用
fk_entryid
和table1
中的table2
,必须将它们更改为 分别使用fk_table1_entryid
和fk_table2_entryid
工作。
答案 2 :(得分:1)
上面的所有答案都很棒,但是即使我删除了所有表后也无法解决我的问题,但是在我删除数据库并再次创建它之后,一切运行正常,并且迁移运行顺利。...似乎是关键删除表后将对其进行缓存,并且不会将其清除。
注意:这不是问题的答案,但我的经验可能会对他人有所帮助。
答案 3 :(得分:0)
这是对@ peter-moses的回应,因为我遇到的问题和他完全一样。
我通过在转储命令中添加--add-drop-database
解决了该问题。其记录在这里:https://mariadb.com/kb/en/mysqldump/
我的最终命令如下:
mysqldump -uroot -ppassword --single-transaction --all-databases --add-drop-database