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`; 