@TableField(value = "status") 作用

@TableField(value = "status") 是 MyBatis-Plus 框架中的注解，用于指定实体类中对应数据库表中的字段名为 status。这个注解可以用于实体类的属性上，也可以用于实体类的 getter 方法上。它的作用是将实体类中的属性映射到对应的数据库表中的字段上。

相关问题

@Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "advert") public class Advert { /** * 主键 / @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @ApiModelProperty(value = "广告唯一id") private Integer id; /* * 广告名称 / @ApiModelProperty(value = "广告名称") @NotBlank(message = "广告名称不可为空", groups = {AddGroup.class, UpdateGroup.class}) private String name; /* * 广告位置ID / @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "position_id") private AdPosition position; /* * 广告图片ID / @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "media_id") private MediaFile media; /* * 开始日期 / @Column(name = "start_date") @ApiModelProperty(value = "开始日期") @NotNull(message = "开始日期不可为空", groups = {AddGroup.class}) private Date startDate; /* * 结束日期 / @Column(name = "end_date") @ApiModelProperty(value = "结束日期") @NotNull(message = "结束日期不可为空", groups = {AddGroup.class}) private Date endDate; /* * 广告链接 / @ApiModelProperty(value = "广告链接") @NotBlank(message = "广告链接不可为空", groups = {AddGroup.class}) private String link; /* * 广告状态：0：未启用，1：已启用，2：已结束 / @ApiModelProperty(value = "广告状态") @NotNull(message = "广告状态不可为空", groups = {UpdateGroup.class}) private Integer status; /* * 创建时间 / @Column(name = "create_time") @ApiModelProperty(value = "创建时间") private Date createTime; /* * 更新时间 */ @Column(name = "update_time") @ApiModelProperty(value = "更新时间") private Date updateTime; }如何在使用basemapper的插入时给position和media赋值，正常赋值会报错Cause: java.sql.SQLException: Field 'position_id' doesn't have a default value ; Field 'position_id' doesn't have a default value; nested exception is java.sql.SQLException: Field 'position_id' doesn't have a default value

可以在插入时手动设置position和media的值，例如：

Advert advert = new Advert();
advert.setName("广告名称");
advert.setStartDate(new Date());
advert.setEndDate(new Date());
advert.setLink("广告链接");
advert.setStatus(0);
advert.setPosition(new AdPosition(1)); //手动设置position的值
advert.setMedia(new MediaFile(1)); //手动设置media的值
advertMapper.insert(advert);

其中，1为position和media对应的ID值。这样就可以成功插入数据了。

@Data @TableName("bis_task") public class BisTask { private static final long serialVersionUID = 1L; @TableId(value="id" , type = IdType.AUTO) private Integer id; @TableField("task_name") private String taskName; @TableField("create_time") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") private Date createTime; @TableField("task_status") private Integer taskStatus; @TableField("expect_task_start_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") @JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8") private Date expectTaskStartDate; @TableField("actual_task_start_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") private Date actualTaskStartDate; @TableField("expect_task_end_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") @JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8") private Date expectTaskEndDate; @TableField("actual_task_end_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") private Date actualTaskEndDate; @TableField("fly_place") private String flyPlace; } 帮我写一个根据id修改，但是projectName是BisProject类的, BisTask类的id关联BisTaskTower类的taskId， BisTower类的id关联BisTaskTower类的Id， BisTower类的projectId关联BisProject类的id， 用mybtais-plus修改，不要写mapper和sql

好的，以下是根据id修改BisTask类的方法，同时修改BisTask关联的其他类的相关信息：

@Service
public class BisTaskService extends ServiceImpl<BisTaskMapper, BisTask> {

    @Autowired
    private BisTaskTowerMapper bisTaskTowerMapper;

    @Autowired
    private BisTowerMapper bisTowerMapper;

    @Autowired
    private BisProjectMapper bisProjectMapper;

    /**
     * 根据id修改BisTask类的相关信息
     * BisTask类的id关联BisTaskTower类的taskId，
     * BisTower类的id关联BisTaskTower类的towerId，
     * BisTower类的projectId关联BisProject类的id
     *
     * @param id           BisTask的id
     * @param projectName BisProject的projectName
     * @param bisTask      BisTask对象，修改的其他属性值
     * @return 是否修改成功
     */
    public boolean updateBisTaskAndRelatedInfoById(Integer id, String projectName, BisTask bisTask) {
        // 根据id查询BisTask
        BisTask oldTask = getById(id);
        if (oldTask == null) {
            return false;
        }
        // 更新BisTask的属性值
        oldTask.setTaskName(bisTask.getTaskName());
        oldTask.setCreateTime(bisTask.getCreateTime());
        oldTask.setTaskStatus(bisTask.getTaskStatus());
        oldTask.setExpectTaskStartDate(bisTask.getExpectTaskStartDate());
        oldTask.setActualTaskStartDate(bisTask.getActualTaskStartDate());
        oldTask.setExpectTaskEndDate(bisTask.getExpectTaskEndDate());
        oldTask.setActualTaskEndDate(bisTask.getActualTaskEndDate());
        oldTask.setFlyPlace(bisTask.getFlyPlace());

        // 更新BisTaskTower的属性值
        QueryWrapper<BisTaskTower> bisTaskTowerQueryWrapper = new QueryWrapper<>();
        bisTaskTowerQueryWrapper.eq("task_id", id);
        List<BisTaskTower> bisTaskTowerList = bisTaskTowerMapper.selectList(bisTaskTowerQueryWrapper);
        for (BisTaskTower bisTaskTower : bisTaskTowerList) {
            bisTaskTower.setTaskId(oldTask.getId());
            bisTaskTowerMapper.updateById(bisTaskTower);
        }

        // 更新BisTower的属性值
        QueryWrapper<BisTower> bisTowerQueryWrapper = new QueryWrapper<>();
        bisTowerQueryWrapper.in("id", bisTaskTowerList.stream().map(BisTaskTower::getTowerId).collect(Collectors.toList()));
        List<BisTower> bisTowerList = bisTowerMapper.selectList(bisTowerQueryWrapper);
        for (BisTower bisTower : bisTowerList) {
            bisTower.setProjectId(bisProjectMapper.selectOne(new QueryWrapper<BisProject>().eq("project_name", projectName)).getId());
            bisTowerMapper.updateById(bisTower);
        }

        // 更新BisTask
        return updateById(oldTask);
    }
}

需要注意的是，这里传入的BisTask对象只需要包含需要修改的属性值，其他属性值会从数据库中查询出来并更新。另外，需要注意更新BisTower时需要先根据BisTaskTower的towerId查询出BisTower对象，再根据BisTower的projectId查询出BisProject的id，最后更新BisTower的projectId。