【发布时间】：2022-11-27 17:58:53
【问题描述】：
请帮助我的逻辑。 是否可以同时在多个实体中保存数据？如果是，那怎么办？ 我也必须对歌手实体做同样的事情，即将歌手数据添加到歌曲实体......它需要相同的逻辑还是不同的逻辑。 实体的代码如下：
相册实体
@Entity
@Table(name = "albums")
public class AlbumEntity extends ApplicationPersistenceEntity implements Album {
@Id
@Column(name = "album_id")
@NotNull
private long albumId;
@NotEmpty
@Column(name = "NAME")
private String albumName;
@NotEmpty
@Column(name = "Genre")
private String genre;
@Column(name = "album_release_date", columnDefinition = "DATE", nullable = false)
@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date albumreleaseDate;
@ManyToOne(cascade = CascadeType.ALL, optional = false, fetch = FetchType.LAZY)
@JoinColumn(name = "singer_id", nullable = false)
private SingerEntity singer;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "album")
@Fetch(FetchMode.JOIN)
private List<SongEntity> songs;
private static final long serialVersionUID = 1L;
/**
* The constructor.
*/
public AlbumEntity() {
}
/**
* The constructor.
*
* @param albumId
* @param albumName
* @param genre
* @param albumreleaseDate
* @param singer
* @param songs
*/
public AlbumEntity(long albumId, String albumName, String genre, Date albumreleaseDate, SingerEntity singer,
List<SongEntity> songs) {
super();
this.albumId = albumId;
this.albumName = albumName;
this.genre = genre;
this.albumreleaseDate = albumreleaseDate;
this.singer = singer;
this.songs = songs;
}
/**
* @return albumId
*/
@Override
public long getAlbumId() {
return this.albumId;
}
/**
* @param albumId new value of {@link #getalbumId}.
*/
@Override
public void setAlbumId(long albumId) {
this.albumId = albumId;
}
/**
* @return albumName
*/
@Override
public String getAlbumName() {
return this.albumName;
}
/**
* @param albumName new value of {@link #getalbumName}.
*/
@Override
public void setAlbumName(String albumName) {
this.albumName = albumName;
}
/**
* @return genre
*/
@Override
public String getGenre() {
return this.genre;
}
/**
* @param genre new value of {@link #getgenre}.
*/
@Override
public void setGenre(String genre) {
this.genre = genre;
}
/**
* @return albumreleaseDate
*/
@Override
public Date getAlbumreleaseDate() {
return this.albumreleaseDate;
}
/**
* @param albumreleaseDate new value of {@link #getalbumreleaseDate}.
*/
@Override
public void setAlbumreleaseDate(Date albumreleaseDate) {
this.albumreleaseDate = albumreleaseDate;
}
/**
* @return singer
*/
public SingerEntity getSinger() {
return this.singer;
}
/**
* @param singer new value of {@link #getsinger}.
*/
public void setSinger(SingerEntity singer) {
this.singer = singer;
}
/**
* @return songs
*/
public List<SongEntity> getSongs() {
return this.songs;
}
/**
* @param songs new value of {@link #getsongs}.
*/
public void setSongs(List<SongEntity> songs) {
this.songs = songs;
}
@Override
@Transient
public Long getSingerId() {
if (this.singer == null) {
return null;
}
return this.singer.getId();
}
@Override
public void setSingerId(Long singerId) {
if (singerId == null) {
this.singer = null;
} else {
SingerEntity singerEntity = new SingerEntity();
singerEntity.setId(singerId);
this.singer = singerEntity;
}
}
@Override
public String toString() {
return "AlbumEntity [albumId=" + this.albumId + ", albumName=" + this.albumName + ", genre=" + this.genre
+ ", albumreleaseDate=" + this.albumreleaseDate + ", singer=" + this.singer + ", songs=" + this.songs + "]";
}
}
歌曲实体
@Entity
@Table(name = "songs")
public class SongEntity extends ApplicationPersistenceEntity implements Song {
@Id
@Column(name = "song_id")
// @GeneratedValue(strategy = GenerationType.TABLE)
private long songId;
@Column(name = "Title")
private String title;
@Column(name = "duration")
private float duration;
/**
* @return duration
*/
@Override
public float getDuration() {
return this.duration;
}
/**
* @param duration new value of {@link #getduration}.
*/
@Override
public void setDuration(float duration) {
this.duration = duration;
}
@ManyToOne(cascade = CascadeType.PERSIST, optional = false, fetch = FetchType.LAZY)
@JoinColumn(name = "singer_id", nullable = false)
private SingerEntity singer;
@ManyToOne(cascade = CascadeType.ALL, optional = true, fetch = FetchType.LAZY)
@JoinColumn(name = "album_id")
private AlbumEntity album;
private static final long serialVersionUID = 1L;
/**
* The constructor.
*/
public SongEntity() {
}
/**
* The constructor.
*
* @param songId
* @param title
* @param content
* @param singer
* @param album
*/
public SongEntity(long songId, String title, SingerEntity singer, AlbumEntity album) {
super();
this.songId = songId;
this.title = title;
this.singer = singer;
this.album = album;
}
/**
* @return songId
*/
@Override
public long getSongId() {
return this.songId;
}
/**
* @param songId new value of {@link #getsongId}.
*/
@Override
public void setSongId(long songId) {
this.songId = songId;
}
/**
* @return title
*/
@Override
public String getTitle() {
return this.title;
}
/**
* @param title new value of {@link #gettitle}.
*/
@Override
public void setTitle(String title) {
this.title = title;
}
/**
* @return singer
*/
public SingerEntity getSinger() {
return this.singer;
}
/**
* @param singer new value of {@link #getsinger}.
*/
public void setSinger(SingerEntity singer) {
this.singer = singer;
}
/**
* @return album
*/
public AlbumEntity getAlbum() {
return this.album;
}
/**
* @param album new value of {@link #getalbum}.
*/
public void setAlbum(AlbumEntity album) {
this.album = album;
}
@Override
@Transient
public Long getSingerId() {
if (this.singer == null) {
return null;
}
return this.singer.getId();
}
@Override
public void setSingerId(Long singerId) {
if (singerId == null) {
this.singer = null;
} else {
SingerEntity singerEntity = new SingerEntity();
singerEntity.setId(singerId);
this.singer = singerEntity;
}
}
@Override
@Transient
public Long getAlbumId() {
if (this.album == null) {
return null;
}
return this.album.getId();
}
@Override
public void setAlbumId(Long albumId) {
if (albumId == null) {
this.album = null;
} else {
AlbumEntity albumEntity = new AlbumEntity();
albumEntity.setId(albumId);
this.album = albumEntity;
}
}
@Override
public String toString() {
return "SongEntity [songId=" + this.songId + ", title=" + this.title + ", duration=" + this.duration + ", singer="
+ this.singer + ", album=" + this.album + "]";
}
}
歌手实体
@Entity
@Table(name = "singers")
public class SingerEntity extends ApplicationPersistenceEntity implements Singer {
@Id
@Column(name = "singer_id")
private long singerId;
@NotEmpty
@Column(name = "singer_name")
private String singerName;
@NotEmpty
@Column(name = "Gender")
private String gender;
@Column(name = "birth_date", columnDefinition = "DATE", nullable = false)
@JsonFormat(pattern = "yyyy-MM-dd")
private Date birthDate;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "singer")
private List<SongEntity> songs;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "singer")
private List<AlbumEntity> albums;
private static final long serialVersionUID = 1L;
/**
* The constructor.
*/
public SingerEntity() {
}
/**
* The constructor.
*
* @param singerId
* @param firstname
* @param lastname
* @param gender
* @param songs
* @param albums
*/
public SingerEntity(long singerId, String singerName, String gender, Date birthDate, List<SongEntity> songs,
List<AlbumEntity> albums) {
super();
this.singerId = singerId;
this.singerName = singerName;
this.gender = gender;
this.birthDate = birthDate;
this.songs = songs;
this.albums = albums;
}
/**
* @return singerId
*/
@Override
public long getSingerId() {
return this.singerId;
}
/**
* @param singerId new value of {@link #getsingerId}.
*/
@Override
public void setSingerId(long singerId) {
this.singerId = singerId;
}
/**
* @return firstname
*/
@Override
public String getSingerName() {
return this.singerName;
}
/**
* @param singername new value of {@link #getsingername}.
*/
@Override
public void setSingerName(String singerName) {
this.singerName = singerName;
}
/**
* @return gender
*/
@Override
public String getGender() {
return this.gender;
}
/**
* @param gender new value of {@link #getgender}.
*/
@Override
public void setGender(String gender) {
this.gender = gender;
}
/**
* @return birthDate
*/
@Override
public Date getBirthDate() {
return this.birthDate;
}
/**
* @param birthDate new value of {@link #getbirthDate}.
*/
@Override
public void setBirthDate(Date birthDate) {
this.birthDate = birthDate;
}
/**
* @return songs
*/
public List<SongEntity> getSongs() {
return this.songs;
}
/**
* @param songs new value of {@link #getsongs}.
*/
public void setSongs(List<SongEntity> songs) {
this.songs = songs;
}
/**
* @return albums
*/
public List<AlbumEntity> getAlbums() {
return this.albums;
}
/**
* @param albums new value of {@link #getalbums}.
*/
public void setAlbums(List<AlbumEntity> albums) {
this.albums = albums;
}
@Override
public String toString() {
return "SingerEntity [singerId=" + this.singerId + ", singerName=" + this.singerName + ", gender=" + this.gender
+ ", birthDate=" + this.birthDate + ", songs=" + this.songs + ", albums=" + this.albums + "]";
}
}
I want to add songs to album table.
But I am not able to figure out the logic to do this.
I want that when I send data from post man like
{ “编号”：102， “专辑 ID”：102， "专辑名称": "HS1", “流派”：“流行”， “歌手编号”：202，
"songs":[{"id": 302,
"songId": 302,
"title": "Bad blood",
"singerId": 201,
"duration": 3.76
},
{“编号”：303， “歌曲编号”：303， "title": "快乐", “歌手编号”：202， “持续时间”：3.54
], "专辑发行日期":"2019-05-16" }
Then the data should be saved in album and song table respectively
[enter image description here](https://i.stack.imgur.com/ZOMRY.png)
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【问题讨论】：
标签： postgresql spring-boot hibernate spring-data-jpa postman