插入失败：无法添加或更新子行：外键约束失败

Question

我有两个表 - 用户和语言与他们的主键'id'的外键链接。 我已经检查过，表的类型是innoDB。我有delete-限制和更新cascade。

此插入查询，将其插入的语言表：（它可以是多行被添加作为形式具有动态clickevent按钮）

if(empty($_SESSION['user_id'])) { // user not logged in; redirect to somewhere else } 

$sql_insert = "INSERT into `language` 
(`native`,`other`,`other_list`,`other_read`, `other_spokint` 
,`other_spokprod`,`other_writ` ) 
VALUES 
('$native','$other','$other_list','$other_read','$other_spokint','$other_spokprod', 
'$other_writ') "; 

mysql_query($sql_insert,$link) or die("Insertion Failed:" . mysql_error());  
} 

这是完整的错误：

Insertion Failed:Cannot add or update a child row: a foreign key constraint fails 
(`members`.`language`, CONSTRAINT `language_ibfk_1` FOREIGN KEY (`id`) 
REFERENCES `users` (`id`)) 

任何帮助，将不胜感激！

为表语言表结构：

CREATE TABLE IF NOT EXISTS `language` (
`id` bigint(20) NOT NULL AUTO_INCREMENT, 
`native` varchar(30) NOT NULL, 
`other` varchar(30) NOT NULL, 
`other_list` varchar(9) NOT NULL, 
`other_read` varchar(9) NOT NULL, 
`other_spokint` varchar(9) NOT NULL, 
`other_spokprod` varchar(9) NOT NULL, 
`other_writ` varchar(9) NOT NULL, 
    PRIMARY KEY (`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; 


RELATIONS FOR TABLE `language`: 
`id` 
`users` -> `id` 

Answer 1

你必须使用这样的结构：

create table users (
    id int not null auto_increment, 
    <additional fields>, 

    primary key (id) 
) ENGINE=InnoDB; 


create table language(
    id int not null auto_increment, 
    user_id int not null, 
    <additional fields>, 

    primary key (id), 
    foreign key (user_id) references users(id) on delete restrict on update cascade 
) ENGINE=InnoDB;