今天遇到這個錯誤，網上查了下，大多說是有必填字段沒有填，搞了很久沒搞定，最后發現不是因為這個問題，而是因為字段設置了唯一值，如果表中已存在此記錄，再插入則報此錯誤。
Hibernate: insert into membership.t_user (login_id, password, type, status, email, mobile, first_name, last_name, nickname, gender, birthday, country, region, creation_date, last_update_date, join_confirm_date, activation_date, deactivation_date, register_code, join_expire_date) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
org.springframework.dao.DataIntegrityViolationException: could not insert: [com.igen6.sac.ms.bean.TUser]; SQL [insert into membership.t_user (login_id, password, type, status, email, mobile, first_name, last_name, nickname, gender, birthday, country, region, creation_date, last_update_date, join_confirm_date, activation_date, deactivation_date, register_code, join_expire_date) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [com.igen6.sac.ms.bean.TUser]