违反完整性约束:1452 无法添加或更新子行:

问题描述

我正在尝试将值插入到我的评论表中，但出现错误.它说我无法添加或更新子行，我不知道这是什么意思.

我的架构看起来像这样

-- ------------------------------ `comments` 的表结构-- --------------------------如果存在评论"，则删除表；创建表`评论`(`id` varchar(36) 非空，`project_id` varchar(36) 非空，`user_id` varchar(36) 非空，`task_id` varchar(36) 非空，`data_type_id` varchar(36) 非空，`data_path` varchar(255) 默认为空，`消息`长文本，`created` 日期时间默认为 NULL，`修改的`日期时间默认为空，主键(`id`)，KEY`fk_comments_users`(`user_id`)，KEY`fk_comments_projects1`(`project_id`)，KEY`fk_comments_data_types1`(`data_type_id`)，约束`fk_comments_data_types1` FOREIGN KEY (`data_type_id`) REFERENCES `data_types` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,约束`fk_comments_projects1` FOREIGN KEY (`project_id`) REFERENCES `projects` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,约束`fk_comments_users`外键(`user_id`)引用`users`(`id`)在删除时没有操作更新没有操作) 引擎=InnoDB 默认字符集=utf32;-- ---------------------------- 评论记录-- ---------------------------- ----------------------------`projects`的表结构-- --------------------------如果存在项目"，则删除表；创建表`项目`(`id` varchar(36) 非空，`user_id` varchar(36) 非空，`title` varchar(45) 默认为空，`描述`长文本，`created` 日期时间默认为 NULL，`修改的`日期时间默认为空，主键(`id`)，密钥`fk_projects_users1`(`user_id`)，约束`fk_projects_users1`外键(`user_id`)引用`users`(`id`)在删除时无操作更新无操作) 引擎=InnoDB 默认字符集=utf32;-- ---------------------------- 项目记录-- --------------------------INSERT INTO `projects` VALUES ('50dcbc72-3410-4596-8b71-0e80ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', 'Brand New Project', 'This is a122012'-27 15:24:02', '2012-12-27 15:24:02');

我试图做的 mysql 语句看起来像这样

INSERT INTO `anthonyl_fbpj`.`comments`(`project_id`、`user_id`、`task_id`、`data_type_id`、`message`、`modified`、`created`、`id`)值 ('50dc845a-83e4-4db3-8705-5432ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', '1', '50d32e5c-abdc-48e1a-abdc-48e1a-abdc-48e12012-12-27 19:20:46'、'2012-12-27 19:20:46'、'50dcf3ee-8bf4-4685-aa45-4eb4ae7aaee3')

我得到的错误看起来像这样

SQLSTATE[23000]:违反完整性约束:1452 无法添加或更新子行:外键约束失败(anthonyl_fbpj.comments, CONSTRAINT fk_comments_projects1外键 (project_id) 参考 projects (id) ON DELETE NO更新操作无操作)

这只是意味着您正在插入的表 comments 上列 project_id 的值没有存在于表 projects 上.请记住，表 comments 上列 project_id 的值取决于表 Projects 上的 ID 值.

您为列 project_id 插入的值 50dc845a-83e4-4db3-8705-5432ae7aaee3 在表 projects 中不存在.>

I am trying to insert values into my comments table and I am getting a error. Its saying that I can not add or update child row and I have no idea what that means.

my schema looks something like this

-- ----------------------------
-- 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');

and the mysql statement I am trying to do looks something like this

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')

the error I get looks like this

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (anthonyl_fbpj.comments, CONSTRAINT fk_comments_projects1 FOREIGN KEY (project_id) REFERENCES projects (id) ON DELETE NO ACTION ON UPDATE NO ACTION)

It just simply means that the value for column project_id on table comments you are inserting doesn't exist on table projects. Bear in mind that the values of column project_id on table comments is dependent on the values of ID on table Projects.

The value 50dc845a-83e4-4db3-8705-5432ae7aaee3 you are inserting for column project_id does not exist on table projects.

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