mybatisPlus的更新操作

Question

@Mapper
public interface EmployeeMapper extends BaseMapper<Employee> {
}
 Employee employee=new Employee();
        employee.setId(2L);
        employee.setName("666");
        employee.setPassword("123123");
       // employee.setUpdateUser(666l);
        System.out.println(employee);
        employeeMapper.updateById(employee);

CREATE TABLE `employee` (
  `id` bigint(20) NOT NULL COMMENT '主键',
  `name` varchar(32) COLLATE utf8_bin NOT NULL COMMENT '姓名',
  `username` varchar(32) COLLATE utf8_bin NOT NULL COMMENT '用户名',
  `password` varchar(64) COLLATE utf8_bin NOT NULL COMMENT '密码',
  `phone` varchar(11) COLLATE utf8_bin NOT NULL COMMENT '手机号',
  `sex` varchar(2) COLLATE utf8_bin NOT NULL COMMENT '性别',
  `id_number` varchar(18) COLLATE utf8_bin NOT NULL COMMENT '身份证号',
  `status` int(11) NOT NULL DEFAULT '1' COMMENT '状态 0:禁用，1:正常',
  `create_time` datetime NOT NULL COMMENT '创建时间',
  `update_time` datetime NOT NULL COMMENT '更新时间',
  `create_user` bigint(20) NOT NULL COMMENT '创建人',
  `update_user` bigint(20) NOT NULL COMMENT '修改人',
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE KEY `idx_username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='员工信息';

上面是表和响应的Java代码、
为什么该mp的更新语句失败、
mp的SQL如下

Answer 1

 @TableField(fill = FieldFill.INSERT)
    private Long createUser;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Long updateUser;