mysql无法添加或更新子行_违反完整性约束：1452无法添加或更新子行：

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，我也不知道这意味着什么。

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', '-12-27 15:24:02', '-12-27 15:24:02');

和我试图做的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`)

VALUES ('50dc845a-83e4-4db3-8705-5432ae7aaee3', '50dcbc5c-d684-40bf-9715-0becae7aaee3', '1', '50d32e5c-abdc-491a-a0ef-25d84e9f49a8', 'this is a test', '-12-27 19:20:46', '-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 FOREIGN

KEY(project_id)引用projects(id)删除无操作，更新无操作)