休眠 - 更新非 ID 外键
hibernate - update non-id foreign key
我对休眠还很陌生,但我需要做一个一对一的映射,
我有一个 table resources
有一个外键 res_music_id
到 table music
.
在我做了很多搜索和调整之后它可以工作,但仍然存在一个问题:resources
的 ID 已更新,但 res_music_id
的值未更新;所以,每次我调用 resources
的索引时,它都会在 music
中给我相同的记录。所以我也需要动态更改 res_music_id
,我该怎么做?顺便说一句,我在 mySQL 中有一个数据库。
这是我的代码:
资源
package database;
import com.sun.istack.internal.NotNull;
import org.hibernate.annotations.*;
import org.hibernate.annotations.Parameter;
import javax.persistence.*;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Arrays;
/**
* @author Jari Van Melckebeke
*/
@Entity
@Table(name = "resources", catalog = "teresaDB")
public class Resources implements Serializable {
private int resId;
private String sort;
private String location;
private int resMusicId;
private Music music;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "res_id")
public int getResId() {
return resId;
}
@Column(name = "res_sort")
public String getSort() {
return sort;
}
@Column(name = "res_location")
public String getLocation() {
return location;
}
@GenericGenerator(name = "gen", strategy = "property", parameters = @Parameter(name = "property",value = "id"))
@GeneratedValue(strategy = GenerationType.AUTO, generator = "gen")
@Column(name = "res_music_id")
public int getResMusicId() {
return resMusicId;
}
public void setResId(int resId) {
this.resId = resId;
}
public void setSort(String sort) {
this.sort = sort;
}
public void setLocation(String location) {
this.location = location;
}
public void setMusic(Music music) {
this.music = music;
}
public void setResMusicId(int resMusicId) {
this.resMusicId = resMusicId;
}
@Override
public String toString() {
return Arrays.toString(new String[]{"id:" + getResId(), "sort:" + getSort(), "location:" + getLocation(), "music-id:" + getResMusicId()});
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(referencedColumnName = "id", name = "res_music_id", insertable = false, updatable = false)
public Music getMusic() {
return music;
}
}
音乐
package database;
import org.hibernate.annotations.*;
import javax.annotation.Nullable;
import javax.persistence.*;
import javax.persistence.AccessType;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Arrays;
/**
* @author Jari Van Melckebeke
*/
@Entity
@Table(name = "music", catalog = "teresaDB")
public class Music implements Serializable {
private int musicId;
private String musicName;
private String musicArtist;
private String musicAlbum;
private Resources resources;
@Column(name = "track")
public String getMusicName() {
return musicName;
}
@Column(name = "artist")
public String getMusicArtist() {
return musicArtist;
}
@Id
@Access(value = AccessType.PROPERTY)
@GeneratedValue(strategy = GenerationType.IDENTITY)
public int getMusicId() {
return musicId;
}
@Column(name = "album")
@Nullable
public String getMusicAlbum() {
return musicAlbum;
}
public void setMusicId(int musicId) {
this.musicId = musicId;
}
public void setMusicAlbum(String musicAlbum) {
this.musicAlbum = musicAlbum;
}
public void setMusicArtist(String musicArtist) {
this.musicArtist = musicArtist;
}
public void setMusicName(String musicName) {
this.musicName = musicName;
}
@Override
public String toString() {
return Arrays.toString(new String[]{"id:" + getMusicId(), "track:" + getMusicName(), "artist:" + getMusicArtist(), "album:" + getMusicAlbum()});
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(referencedColumnName = "res_music_id", name = "id", insertable = false, updatable = false)
public Resources getResources() {
return resources;
}
public void setResources(Resources resources) {
this.resources = resources;
}
}
mySQL
CREATE TABLE `resources` (
`res_id` int(11) NOT NULL AUTO_INCREMENT,
`res_sort` varchar(255) DEFAULT NULL,
`res_location` varchar(255) DEFAULT NULL,
`res_music_id` int(11) DEFAULT NULL,
PRIMARY KEY (`res_id`),
KEY `mus_ind` (`res_music_id`),
CONSTRAINT `resources_ibfk_1` FOREIGN KEY (`res_music_id`) REFERENCES `music` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
CREATE TABLE `music` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`track` varchar(255) DEFAULT NULL,
`artist` varchar(255) DEFAULT NULL,
`album` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
我知道,我不擅长'clean code'
提前致谢
在您的父实体(资源)中,您将连接(使用@JoinColumn)定义为 insertable = false,updatable = false,因此 creating/udpating 相关实体的责任不在当前实体。
我对休眠还很陌生,但我需要做一个一对一的映射,
我有一个 table resources
有一个外键 res_music_id
到 table music
.
在我做了很多搜索和调整之后它可以工作,但仍然存在一个问题:resources
的 ID 已更新,但 res_music_id
的值未更新;所以,每次我调用 resources
的索引时,它都会在 music
中给我相同的记录。所以我也需要动态更改 res_music_id
,我该怎么做?顺便说一句,我在 mySQL 中有一个数据库。
这是我的代码:
资源
package database;
import com.sun.istack.internal.NotNull;
import org.hibernate.annotations.*;
import org.hibernate.annotations.Parameter;
import javax.persistence.*;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Arrays;
/**
* @author Jari Van Melckebeke
*/
@Entity
@Table(name = "resources", catalog = "teresaDB")
public class Resources implements Serializable {
private int resId;
private String sort;
private String location;
private int resMusicId;
private Music music;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "res_id")
public int getResId() {
return resId;
}
@Column(name = "res_sort")
public String getSort() {
return sort;
}
@Column(name = "res_location")
public String getLocation() {
return location;
}
@GenericGenerator(name = "gen", strategy = "property", parameters = @Parameter(name = "property",value = "id"))
@GeneratedValue(strategy = GenerationType.AUTO, generator = "gen")
@Column(name = "res_music_id")
public int getResMusicId() {
return resMusicId;
}
public void setResId(int resId) {
this.resId = resId;
}
public void setSort(String sort) {
this.sort = sort;
}
public void setLocation(String location) {
this.location = location;
}
public void setMusic(Music music) {
this.music = music;
}
public void setResMusicId(int resMusicId) {
this.resMusicId = resMusicId;
}
@Override
public String toString() {
return Arrays.toString(new String[]{"id:" + getResId(), "sort:" + getSort(), "location:" + getLocation(), "music-id:" + getResMusicId()});
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(referencedColumnName = "id", name = "res_music_id", insertable = false, updatable = false)
public Music getMusic() {
return music;
}
}
音乐
package database;
import org.hibernate.annotations.*;
import javax.annotation.Nullable;
import javax.persistence.*;
import javax.persistence.AccessType;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Arrays;
/**
* @author Jari Van Melckebeke
*/
@Entity
@Table(name = "music", catalog = "teresaDB")
public class Music implements Serializable {
private int musicId;
private String musicName;
private String musicArtist;
private String musicAlbum;
private Resources resources;
@Column(name = "track")
public String getMusicName() {
return musicName;
}
@Column(name = "artist")
public String getMusicArtist() {
return musicArtist;
}
@Id
@Access(value = AccessType.PROPERTY)
@GeneratedValue(strategy = GenerationType.IDENTITY)
public int getMusicId() {
return musicId;
}
@Column(name = "album")
@Nullable
public String getMusicAlbum() {
return musicAlbum;
}
public void setMusicId(int musicId) {
this.musicId = musicId;
}
public void setMusicAlbum(String musicAlbum) {
this.musicAlbum = musicAlbum;
}
public void setMusicArtist(String musicArtist) {
this.musicArtist = musicArtist;
}
public void setMusicName(String musicName) {
this.musicName = musicName;
}
@Override
public String toString() {
return Arrays.toString(new String[]{"id:" + getMusicId(), "track:" + getMusicName(), "artist:" + getMusicArtist(), "album:" + getMusicAlbum()});
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(referencedColumnName = "res_music_id", name = "id", insertable = false, updatable = false)
public Resources getResources() {
return resources;
}
public void setResources(Resources resources) {
this.resources = resources;
}
}
mySQL
CREATE TABLE `resources` (
`res_id` int(11) NOT NULL AUTO_INCREMENT,
`res_sort` varchar(255) DEFAULT NULL,
`res_location` varchar(255) DEFAULT NULL,
`res_music_id` int(11) DEFAULT NULL,
PRIMARY KEY (`res_id`),
KEY `mus_ind` (`res_music_id`),
CONSTRAINT `resources_ibfk_1` FOREIGN KEY (`res_music_id`) REFERENCES `music` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
CREATE TABLE `music` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`track` varchar(255) DEFAULT NULL,
`artist` varchar(255) DEFAULT NULL,
`album` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
我知道,我不擅长'clean code'
提前致谢
在您的父实体(资源)中,您将连接(使用@JoinColumn)定义为 insertable = false,updatable = false,因此 creating/udpating 相关实体的责任不在当前实体。