异常信息：

org.springframework.orm.ObjectOptimisticLockingFailureException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; nested exception is org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

异常分析：

ID没有值

• 使用的是hibernate的saveOrUpdate方法保存实例。saveOrUpdate方法要求ID为null时才执行SAVE，在其它情况下执行UPDATE。在保存实例的时候是新增，但你的ID不为null，所以使用的是UPDATE，但是数据库里没有主键相关的值，所以出现异常。
• SpringBoot集成JPA使用save(S entity)方法时，如果需要进行更新操作，一定需要先获取实体的ID

    /**
   * Saves a given entity. 
     * Use the returned instance for further operations 
     * as the save operation might have changed the
   * entity instance completely.
   *
   * @param entity must not be {@literal null}.
   * @return the saved entity will never be {@literal null}.
   */
  <S extends T> S save(S entity);

ID有重复的

数据库ID重复

异常解决：

ID没有值

通过HQL更新和删除实体，一定需要先获取实体的ID

ID有重复的--解决

可参考：SQL：查找或删除重复行 https://blog.csdn.net/fly910905/article/details/79983334

查询及删除重复记录的SQL语句

 

1、查找表中多余的重复记录，重复记录是根据单个字段（Id）来判断

 

select * from 表 where Id in (select Id from 表 group byId having count(Id) > 1)

 

2、删除表中多余的重复记录，重复记录是根据单个字段（Id）来判断，只留有rowid最小的记录

 

DELETE from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY id HAVING COUNT(*) > 1);

 

3、查找表中多余的重复记录（多个字段）

 

select * from 表 a where (a.Id,a.seq) in(select Id,seq from 表 group by Id,seq having count(*) > 1)

 

4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录

 

delete from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)

 

5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录

 

select * from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)