我试图将我的新模式转发到我的数据库服务器上,但我不知道为什么我会得到这个错误。

我试图在这里寻找答案,但我所找到的一切都表明,要么将数据库引擎设置为InnoDB,要么确保我试图用作外键的键是它们自己表中的主键。如果我没记错的话,这两件事我都做过。我还能做什么?

Executing SQL script in server

ERROR: Error 1215: Cannot add foreign key constraint

-- -----------------------------------------------------
-- Table `Alternative_Pathways`.`Clients_has_Staff`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `Alternative_Pathways`.`Clients_has_Staff` (
  `Clients_Case_Number` INT NOT NULL ,
  `Staff_Emp_ID` INT NOT NULL ,
  PRIMARY KEY (`Clients_Case_Number`, `Staff_Emp_ID`) ,
  INDEX `fk_Clients_has_Staff_Staff1_idx` (`Staff_Emp_ID` ASC) ,
  INDEX `fk_Clients_has_Staff_Clients_idx` (`Clients_Case_Number` ASC) ,
  CONSTRAINT `fk_Clients_has_Staff_Clients`
    FOREIGN KEY (`Clients_Case_Number` )
    REFERENCES `Alternative_Pathways`.`Clients` (`Case_Number` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Clients_has_Staff_Staff1`
    FOREIGN KEY (`Staff_Emp_ID` )
    REFERENCES `Alternative_Pathways`.`Staff` (`Emp_ID` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB

SQL脚本执行完成:语句:7成功,1失败

下面是父表的SQL。

CREATE  TABLE IF NOT EXISTS `Alternative_Pathways`.`Clients` (
  `Case_Number` INT NOT NULL ,
  `First_Name` CHAR(10) NULL ,
  `Middle_Name` CHAR(10) NULL ,
  `Last_Name` CHAR(10) NULL ,
  `Address` CHAR(50) NULL ,
  `Phone_Number` INT(10) NULL ,
  PRIMARY KEY (`Case_Number`) )
ENGINE = InnoDB

CREATE  TABLE IF NOT EXISTS `Alternative_Pathways`.`Staff` (
  `Emp_ID` INT NOT NULL ,
  `First_Name` CHAR(10) NULL ,
  `Middle_Name` CHAR(10) NULL ,
  `Last_Name` CHAR(10) NULL ,
  PRIMARY KEY (`Emp_ID`) )
ENGINE = InnoDB

当前回答

In my case, I had deleted a table using SET FOREIGN_KEY_CHECKS=0, then SET FOREIGN_KEY_CHECKS=1 after. When I went to reload the table, I got error 1215. The problem was there was another table in the database that had a foreign key to the table I had deleted and was reloading. Part of the reloading process involved changing a data type for one of the fields, which made the foreign key from the other table invalid, thus triggering error 1215. I resolved the problem by dropping and then reloading the other table with the new data type for the involved field.

其他回答

错误1215是一个恼人的错误。爆炸药丸的答案涵盖了基本问题。你要确保从那里开始。然而,还有更多更微妙的情况需要注意:

例如,当您尝试连接不同表的主键时,请确保提供适当的ON UPDATE和ON DELETE选项。例如:

...
PRIMARY KEY (`id`),
FOREIGN KEY (`id`) REFERENCES `t` (`other_id`) ON DELETE SET NULL
....

不会生效,因为主键(比如id)不能为NULL。

我确信,在添加这类约束时,甚至还有更多类似的微妙问题,这就是为什么当遇到约束错误时,总是要确保约束及其含义在当前上下文中有意义。祝你的错误1215好运!

In my case, I had deleted a table using SET FOREIGN_KEY_CHECKS=0, then SET FOREIGN_KEY_CHECKS=1 after. When I went to reload the table, I got error 1215. The problem was there was another table in the database that had a foreign key to the table I had deleted and was reloading. Part of the reloading process involved changing a data type for one of the fields, which made the foreign key from the other table invalid, thus triggering error 1215. I resolved the problem by dropping and then reloading the other table with the new data type for the involved field.

你可能会得到外键约束错误的原因:

You are not using InnoDB as the engine on all tables. You are trying to reference a nonexistent key on the target table. Make sure it is a key on the other table (it can be a primary or unique key, or just a key) The types of the columns are not the same (an exception is the column on the referencing table can be nullable even if it is not nullable in the referenced table). If the primary key or foreign key is a varchar, make sure the collation is the same for both. One of the reasons may also be that the column you are using for ON DELETE SET NULL is not defined to be null. So make sure that the column is set default null.

检查这些。

检查表格的排列顺序。使用SHOW TABLE STATUS,可以检查表的信息,包括排序规则。

两个表必须具有相同的排序规则。

这种事发生在我身上。

检查表的兼容性(引擎)与SHOW table STATUS WHERE Name = 'tableName'。

例如,如果一个表是MyISAM,另一个表是InnoDB,你可能会遇到这个问题。

你可以通过下面的命令来改变它:

ALTER TABLE myTable ENGINE = InnoDB;

从文档。