Mysql中zerofill自动填充的实现

CREATE TABLE `project_student_task` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增主键id',
  `user_id` varchar(64) NOT NULL DEFAULT '' COMMENT '飞书用户id',
  `dept_id_path` varchar(255) NOT NULL DEFAULT '' COMMENT '用户部门id path',
  `mentor_user_id` varchar(64) NOT NULL DEFAULT '' COMMENT '导师飞书用户id',
  `project_dataset_check_id` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '项目唯一标识',
  `project_section_key` varchar(128) NOT NULL DEFAULT '' COMMENT '阶段唯一标识',
  `project_section_task_key` varchar(128) NOT NULL DEFAULT '' COMMENT '任务唯一标识',
  `detail_type` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '任务类型',
  `task_name` varchar(64) NOT NULL DEFAULT '' COMMENT '任务名称',
  `detail` longtext NOT NULL COMMENT '任务详情',
  `state` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '任务状态',
  `created_at` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '创建时间戳，单位秒',
  `updated_at` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '更新时间戳，单位秒',
  PRIMARY KEY (`id`),
  UNIQUE KEY `uniq_1` (`project_dataset_check_id`,`project_section_key`,`project_section_task_key`,`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='项目学员任务表';
CREATE TABLE `project` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增主键id',
  `dataset_check_id` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '项目唯一标识',
  `title` varchar(255) NOT NULL DEFAULT '' COMMENT '项目名',
  `training_type` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '培训分类',
  `principals_uids` varchar(255) NOT NULL DEFAULT '' COMMENT '英文逗号分隔的负责人飞书用户id',
  `principals_dept_id_paths` varchar(1024) NOT NULL DEFAULT '' COMMENT '英文逗号分隔的负责人部门id path',
  `join_rule` varchar(2048) NOT NULL DEFAULT '' COMMENT '加入规则，json',
  `auto_join_rule` varchar(2048) NOT NULL DEFAULT '' COMMENT '自动加入规则，json',
  `state` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '项目状态',
  `created_at` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '创建时间戳，单位秒',
  `updated_at` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '更新时间戳，单位秒',
  PRIMARY KEY (`id`),
  UNIQUE KEY `uniq_1` (`dataset_check_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8mb4 COMMENT='项目表';