Mysql 完整性约束冲突:1452无法添加或更新子行:
我试图将值插入到我的注释表中,但遇到了一个错误。它说我不能添加或更新子行,我不知道这意味着什么 我的模式看起来像这样Mysql 完整性约束冲突:1452无法添加或更新子行:,mysql,sql,Mysql,Sql,我试图将值插入到我的注释表中,但遇到了一个错误。它说我不能添加或更新子行,我不知道这意味着什么 我的模式看起来像这样 -- ---------------------------- -- Table structure for `comments` -- ---------------------------- DROP TABLE IF EXISTS `comments`; CREATE TABLE `comments` ( `id` varchar(36) NOT NULL, `pr
-- ----------------------------
-- Table structure for `comments`
-- ----------------------------
DROP TABLE IF EXISTS `comments`;
CREATE TABLE `comments` (
`id` varchar(36) NOT NULL,
`project_id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`task_id` varchar(36) NOT NULL,
`data_type_id` varchar(36) NOT NULL,
`data_path` varchar(255) DEFAULT NULL,
`message` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_comments_users` (`user_id`),
KEY `fk_comments_projects1` (`project_id`),
KEY `fk_comments_data_types1` (`data_type_id`),
CONSTRAINT `fk_comments_data_types1` FOREIGN KEY (`data_type_id`) REFERENCES `data_types` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_projects1` FOREIGN KEY (`project_id`) REFERENCES `projects` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of comments
-- ----------------------------
-- ----------------------------
-- Table structure for `projects`
-- ----------------------------
DROP TABLE IF EXISTS `projects`;
CREATE TABLE `projects` (
`id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`title` varchar(45) DEFAULT NULL,
`description` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_projects_users1` (`user_id`),
CONSTRAINT `fk_projects_users1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of projects
-- ----------------------------
INSERT INTO `projects` VALUES ('50dcbc72-3410-4596-8b71-0e80ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', 'Brand New Project', 'This is a brand new project', '2012-12-27 15:24:02', '2012-12-27 15:24:02');
INSERT INTO `anthonyl_fbpj`.`comments` (`project_id`, `user_id`, `task_id`, `data_type_id`, `message`, `modified`, `created`, `id`)
VALUES ('50dc845a-83e4-4db3-8705-5432ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', '1', '50d32e5c-abdc-491a-a0ef-25d84e9f49a8', 'this is a test', '2012-12-27 19:20:46', '2012-12-27 19:20:46', '50dcf3ee-8bf4-4685-aa45-4eb4ae7aaee3')
我试图做的mysql语句看起来是这样的
-- ----------------------------
-- Table structure for `comments`
-- ----------------------------
DROP TABLE IF EXISTS `comments`;
CREATE TABLE `comments` (
`id` varchar(36) NOT NULL,
`project_id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`task_id` varchar(36) NOT NULL,
`data_type_id` varchar(36) NOT NULL,
`data_path` varchar(255) DEFAULT NULL,
`message` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_comments_users` (`user_id`),
KEY `fk_comments_projects1` (`project_id`),
KEY `fk_comments_data_types1` (`data_type_id`),
CONSTRAINT `fk_comments_data_types1` FOREIGN KEY (`data_type_id`) REFERENCES `data_types` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_projects1` FOREIGN KEY (`project_id`) REFERENCES `projects` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of comments
-- ----------------------------
-- ----------------------------
-- Table structure for `projects`
-- ----------------------------
DROP TABLE IF EXISTS `projects`;
CREATE TABLE `projects` (
`id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`title` varchar(45) DEFAULT NULL,
`description` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_projects_users1` (`user_id`),
CONSTRAINT `fk_projects_users1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of projects
-- ----------------------------
INSERT INTO `projects` VALUES ('50dcbc72-3410-4596-8b71-0e80ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', 'Brand New Project', 'This is a brand new project', '2012-12-27 15:24:02', '2012-12-27 15:24:02');
INSERT INTO `anthonyl_fbpj`.`comments` (`project_id`, `user_id`, `task_id`, `data_type_id`, `message`, `modified`, `created`, `id`)
VALUES ('50dc845a-83e4-4db3-8705-5432ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', '1', '50d32e5c-abdc-491a-a0ef-25d84e9f49a8', 'this is a test', '2012-12-27 19:20:46', '2012-12-27 19:20:46', '50dcf3ee-8bf4-4685-aa45-4eb4ae7aaee3')
我得到的错误如下所示
-- ----------------------------
-- Table structure for `comments`
-- ----------------------------
DROP TABLE IF EXISTS `comments`;
CREATE TABLE `comments` (
`id` varchar(36) NOT NULL,
`project_id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`task_id` varchar(36) NOT NULL,
`data_type_id` varchar(36) NOT NULL,
`data_path` varchar(255) DEFAULT NULL,
`message` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_comments_users` (`user_id`),
KEY `fk_comments_projects1` (`project_id`),
KEY `fk_comments_data_types1` (`data_type_id`),
CONSTRAINT `fk_comments_data_types1` FOREIGN KEY (`data_type_id`) REFERENCES `data_types` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_projects1` FOREIGN KEY (`project_id`) REFERENCES `projects` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_comments_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of comments
-- ----------------------------
-- ----------------------------
-- Table structure for `projects`
-- ----------------------------
DROP TABLE IF EXISTS `projects`;
CREATE TABLE `projects` (
`id` varchar(36) NOT NULL,
`user_id` varchar(36) NOT NULL,
`title` varchar(45) DEFAULT NULL,
`description` longtext,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `fk_projects_users1` (`user_id`),
CONSTRAINT `fk_projects_users1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf32;
-- ----------------------------
-- Records of projects
-- ----------------------------
INSERT INTO `projects` VALUES ('50dcbc72-3410-4596-8b71-0e80ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', 'Brand New Project', 'This is a brand new project', '2012-12-27 15:24:02', '2012-12-27 15:24:02');
INSERT INTO `anthonyl_fbpj`.`comments` (`project_id`, `user_id`, `task_id`, `data_type_id`, `message`, `modified`, `created`, `id`)
VALUES ('50dc845a-83e4-4db3-8705-5432ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', '1', '50d32e5c-abdc-491a-a0ef-25d84e9f49a8', 'this is a test', '2012-12-27 19:20:46', '2012-12-27 19:20:46', '50dcf3ee-8bf4-4685-aa45-4eb4ae7aaee3')
SQLSTATE[23000]:完整性约束冲突:1452无法添加或
更新子行:外键约束失败
(anthonyl_fbpj
注释
,约束fk_注释项目1
删除编号上的外键(project\u id
)引用了projects
(id
)
更新时的操作(无操作)
这仅仅意味着要插入的表
comments
上的列project\u id
的值在表projects
上不存在。请记住,表注释上的project\u id
列的值取决于表Projects
上的id
列的值
表projects
中不存在为列project\u id
插入的值50dc845a-83e4-4db3-8705-5432ae7aaee3
,请确保注释模型的可填充属性中有project\u id
我也有同样的问题,这就是原因。还要确保您添加的外键与原始列的类型相同,如果您引用的列不是相同的类型,它也会失败。如果有人正在使用Laravel并遇到此问题。我也得到了这一点,问题在于我在pivot表中插入id(即外键)的顺序
具体来说,下面是一个多对多关系的示例:
wordtokens wordtoken\u wordchunk wordchunks
// wordtoken_wordchunk table
Schema::create('wordtoken_wordchunk', function(Blueprint $table) {
$table->integer('wordtoken_id')->unsigned();
$table->integer('wordchunk_id')->unsigned();
$table->foreign('wordtoken_id')->references('id')->on('word_tokens')->onDelete('cascade');
$table->foreign('wordchunk_id')->references('id')->on('wordchunks')->onDelete('cascade');
$table->primary(['wordtoken_id', 'wordchunk_id']);
});
// wordchunks table
Schema::create('wordchunks', function (Blueprint $table) {
$table->increments('id');
$table->timestamps();
$table->string('text');
});
// wordtokens table
Schema::create('word_tokens', function (Blueprint $table) {
$table->increments('id');
$table->string('text');
});
现在,我的模型如下所示:
class WordToken extends Model
{
public function wordchunks() {
return $this->belongsToMany('App\Wordchunk');
}
}
class Wordchunk extends Model
{
public function wordTokens() {
return $this->belongsToMany('App\WordToken', 'wordtoken_wordchunk', 'wordchunk_id', 'wordtoken_id');
}
}
我通过在wordchunk模型中交换'wordchunk\u id'和'wordtoken\u id'的顺序修复了这个问题
对于代码完成,以下是我如何持久化模型:
private function persistChunks($chunks) {
foreach ($chunks as $chunk) {
$model = new Wordchunk();
$model->text = implode(' ', array_map(function($token) {return $token->text;}, $chunk));
$tokenIds = array_map(function($token) {return $token->id;}, $chunk);
$model->save();
$model->wordTokens()->attach($tokenIds);
}
}
首先删除约束“fk_comments_projects1”及其索引。之后,重新创建它 当我在我的孩子记录中不小心使用了错误的“uuid”时,我遇到了这个问题。发生这种情况时,约束会从子记录查看父记录,以确保链接正确。我是手动生成它的,当时我已经装配好了我的模型来自动生成它。所以我的解决办法是:
$parent = Parent:create($recData); // asssigning autogenerated uuid into $parent
然后,当我调用我的子类来插入子类时,我传递了这个var值:
$parent->uuid
希望这能有所帮助。也许表中有一些行需要创建defk
在关闭“外键”复选框的情况下运行迁移
只插入目录中具有相应id字段的记录。我希望我的决定能有所帮助。我在拉威尔也犯过类似的错误。我将外键添加到错误的表中。
错误代码:
Schema::create('comments', function (Blueprint $table) {
$table->unsignedBigInteger('post_id')->index()->nullable();
...
$table->foreign('post_id')->references('id')->on('comments')->onDelete('cascade');
});
Schema::create('posts', function (Blueprint $table) {
$table->bigIncrements('id');
...
});
请注意以上(‘注释’)中的函数。正确代码
$table->foreign('post_id')->references('id')->on('posts')->onDelete('cascade');
如果将新外键添加到现有表中,且列不为null且未指定默认值,则会出现此错误
您需要使其可为空
或指定默认值
,或者删除所有现有记录
以解决此问题。这意味着表注释上的项目id
列的值
不仅在表项目上不存在
,而且项目id
可能没有默认值。就我而言,我将其设置为空
对于Laravel,您可以将此表达式视为迁移PHP文件的一组代码,例如:
class ForeinToPhotosFromUsers extends Migration
{/***运行迁移。**@return void*/
public function up()
{
Schema::table('users', function (Blueprint $table) {
$table->unsignedBigInteger('photo_id')->nullable();// ! ! ! THIS STRING ! ! !
$table->foreign('photo_id')->references('id')->on('photos');
});
}
}
显然,您必须在所有这些表旁边创建模型类(在我的例子中是Photo)。如果您没有按正确的顺序创建和填充表,也会出现此错误。例如,根据您的模式,Comments表需要用户id
,项目id
,任务id
和数据类型id
。这意味着用户
表格、项目
表格、任务
表格和数据类型
表格必须已经退出,并且在引用其ID或任何其他列之前,其中必须包含值
在Laravel中,这意味着按正确的顺序调用数据库种子程序:
class DatabaseSeeder extends Seeder
{
/**
* Seed the application's database.
*
* @return void
*/
public function run()
{
$this->call(UserSeeder::class);
$this->call(ProjectSeeder::class);
$this->call(TaskSeeder::class);
$this->call(DataTypeSeeder::class);
$this->call(CommentSeeder::class);
}
}
这就是我解决类似问题的方法。我也有同样的错误,问题是我试图将角色id
添加到用户
表中,但角色id
没有默认值,所以DB不允许我插入该列,因为我已经有一些用户,它不知道如何向他们添加该列。
因为我是在开发阶段,所以我只使用了migrate:fresh
,但是如果我是在生产阶段,我可能会为role\u id
设置一个默认值,直到我在数据库上有了相应的角色,我才将其设置为不受约束。我只是导出了删除的表,然后再次导入,它对我有效。这是因为我删除了父表(用户),然后重新创建了它,并且子表(likes)具有父表(用户)的外键。可能是因为您插入的外键值与主键的值不匹配。如果我在该表中有值怎么办?我有相同的错误,但表和ID中有值匹配。我有一个类似的问题。从表中删除旧数据解决了我的问题。Yojan,我们应该删除哪个表,是“父”表还是“子”(从属)表?这里使用Laravel相同。很好的捕获。使列为空解决了问题issue@ChamupathiGigaraHettige很高兴这对你有帮助。:)