违反完整性约束:1452无法添加或更新子行: [英] Integrity constraint violation: 1452 Cannot add or update a child row:

问题描述

我试图在我的注释表中插入值，但出现错误.俗话说我不能添加或更新子行，我也不知道那是什么意思.

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.

我的架构看起来像这样

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

和我尝试执行的mysql语句看起来像这样

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')

我得到的错误是这样的

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 删除编号上的外键(project_id)参考projects(id) 采取行动(不采取行动)

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)

推荐答案

这只是意味着您要插入的表comments上的列project_id的值在表projects上不存在.请记住，表comments上的列project_id的值取决于表Projects上的ID的值.

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.

表projects中不存在您要为列project_id插入的值50dc845a-83e4-4db3-8705-5432ae7aaee3.

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

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