alter table `patent_info` add column `contract_id` VARCHAR(36) null comment '合同ID' after `uid`; alter table `copyright_info` add column `contract_id` VARCHAR(36) null comment '合同ID' after `uid`; alter table `org_cognizance` add column `contract_id` VARCHAR(36) null comment '合同ID' after `uid`; alter table `tech_project` add column `contract_id` VARCHAR(36) null comment '合同ID' after `uid`; alter table `tech_project` add column `principal` VARCHAR(36) null comment '负责人' after `founder`;