乐观锁

//在表中添加字段 version
version  int  11

//在实体类版本号属性添加注解
@Version
private Integer version; //版本号

//配置乐观锁插件
@Configuration
@MapperScan("com.leavescai7.demo20201116.mapper")
public class MpConfig {
     //乐观锁插件
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
         return new OptimisticLockerInterceptor();
    }
}

//测试乐观锁
@Test
public void testOptimisticLocker(){
    //根据id查询数据
    User user = userMppper.selectById(9001);
    //进行修改
    user.setAge(200);
    userMapper.updateById(user);
}