乐观锁和悲观锁

乐观锁：1：先查询，获得版本号 version =1

-- A 线程
update user set name = "陌溪", version = version + 1 
where id = 2 and version = 1

-- B 线程抢先完成，这个时候Version = 2，导致A修改失败
update user set name = "陌溪", version = version + 1 
where id = 2 and version = 1

// 乐观锁Version注解
@Version
private Integer version;

// 注册乐观锁
@Bean
public OptimisticLockerInterceptor optimisticLockerInterceptor() {
	return new OptimisticLockerInterceptor();
}