make menuconifg中的 < > Platform bus driver for memory mapped virtio devices 介 绍

这是一个针对基于内存映射VirtIO设备的平台总线驱动程序。VirtIO是一种虚拟化解决方案，它可以使虚拟机通过在主机和虚拟机之间共享内存来实现高效的通信。这个驱动程序允许使用这种虚拟化解决方案的设备通过总线进行通信，并且提供了一种简单的方式来管理这些设备。当用户选择这个选项后，内核会编译并加载相应的驱动程序，以便在系统中使用基于内存映射VirtIO设备的平台总线。

相关问题

@Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "advert") public class Advert { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @ApiModelProperty(value = "广告唯一id") private Integer id; @ApiModelProperty(value = "广告名称") @NotBlank(message = "广告名称不可为空", groups = {AddGroup.class, UpdateGroup.class}) private String name; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "position_id") private AdPosition position; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "media_id") private MediaFile media; } @Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "ad_position") public class AdPosition { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @ApiModelProperty(value = "位置名称") @NotBlank(message = "位置名称不可为空", groups = {AddGroup.class}) private String name; @OneToMany(mappedBy = "AdPosition", cascade = CascadeType.ALL) private List<Advert> adverts = new ArrayList<>(); } @Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "media_file") public class MediaFile { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @ApiModelProperty(value = "媒体文件名称") private String fileName; @ApiModelProperty(value = "媒体文件类型") private Integer fileType; @ApiModelProperty(value = "媒体文件URL地址") private String fileUrl; @OneToMany(mappedBy = "MediaFile", cascade = CascadeType.ALL) private List<Advert> adverts = new ArrayList<>(); } public interface MyBaseMapper<T> extends Mapper<T>, MySqlMapper<T>,MyInsertListMapper<T> {} public interface AdvertMapper extends MyBaseMapper<Advert> {}，如何保存一个advert对象

保存一个`Advert`对象可以通过使用`AdvertMapper`中的方法来实现，具体步骤如下：

1. 创建一个`Advert`对象，并设置其属性值：

Advert advert = new Advert();
advert.setName("广告名称");

// 设置关联属性
AdPosition position = new AdPosition();
position.setId(1); // 假设要关联的AdPosition的id为1
advert.setPosition(position);

MediaFile media = new MediaFile();
media.setId(2); // 假设要关联的MediaFile的id为2
advert.setMedia(media);

2. 调用`AdvertMapper`中的保存方法进行保存：

@Autowired
private AdvertMapper advertMapper;

// 保存Advert对象
advertMapper.insert(advert);

在保存时，由于`AdPosition`和`MediaFile`实体类中的`adverts`属性都使用了`mappedBy`属性，因此不需要再手动设置关联关系的另一侧。

另外，如果需要同时保存多个`Advert`对象，可以将它们放在一个`List<Advert>`中，然后使用`MyInsertListMapper`中的`batchInsert`方法来进行批量保存，例如：

List<Advert> adverts = new ArrayList<>();
// 添加多个Advert对象到adverts列表中

advertMapper.batchInsert(adverts);

@Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "advert") public class Advert { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @ApiModelProperty(value = "广告唯一id") private Integer id; @ApiModelProperty(value = "广告名称") @NotBlank(message = "广告名称不可为空", groups = {AddGroup.class, UpdateGroup.class}) private String name; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "position_id") private AdPosition position; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "media_id") private MediaFile media; } @Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "ad_position") public class AdPosition { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @ApiModelProperty(value = "位置名称") @NotBlank(message = "位置名称不可为空", groups = {AddGroup.class}) private String name; @OneToMany(mappedBy = "AdPosition", cascade = CascadeType.ALL) private List<Advert> adverts = new ArrayList<>(); } @Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "media_file") public class MediaFile { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @ApiModelProperty(value = "媒体文件名称") private String fileName; @ApiModelProperty(value = "媒体文件类型") private Integer fileType; @ApiModelProperty(value = "媒体文件URL地址") private String fileUrl; @OneToMany(mappedBy = "MediaFile", cascade = CascadeType.ALL) private List<Advert> adverts = new ArrayList<>(); } public interface MyBaseMapper<T> extends Mapper<T>, MySqlMapper<T>,MyInsertListMapper<T> {} public interface AdvertMapper extends MyBaseMapper<Advert> {}，如何对Advert类进行添加操作

可以使用AdvertMapper中的insert方法对Advert类进行添加操作。例如：

@Autowired
private AdvertMapper advertMapper;

Advert advert = Advert.builder()
                .name("test advert")
                .position(new AdPosition(1)) // 假设已经存在id为1的AdPosition
                .media(new MediaFile(1)) // 假设已经存在id为1的MediaFile
                .build();
advertMapper.insert(advert);

这样就可以将Advert对象添加到数据库中了。需要注意的是，如果AdPosition和MediaFile不存在，需要先进行添加操作。