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|
package entity;
import java.io.Serializable;
import java.util.List;
import javax.persistence.*;
@Entity
public class Artist implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String firstName;
private String lastName;
@ManyToMany(cascade = CascadeType.PERSIST)
@JoinTable(name = "joint_art_cd", joinColumns = @JoinColumn(name = "art_fk"),
inverseJoinColumns = @JoinColumn(name = "cd_fk"))
private List<Cd> cd;
public Artist(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public Artist() {
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public List<Cd> getCd() {
return cd;
}
public void setCd(List<Cd> cd) {
this.cd = cd;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
if (!(object instanceof Artist)) {
return false;
}
Artist other = (Artist) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entity.Artist[ id=" + id + " ]";
}
}
package entity;
import java.io.Serializable;
import java.util.List;
import javax.persistence.*;
@Entity
public class Cd implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String title;
private Float price;
private String description;
@ManyToMany(mappedBy = "cd", cascade = CascadeType.ALL)
private List<Artist> artists;
public Cd(String title, Float price, String description) {
this.title = title;
this.price = price;
this.description = description;
}
public Cd() {
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public List<Artist> getArtists() {
return artists;
}
public void setArtists(List<Artist> artists) {
this.artists = artists;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
if (!(object instanceof Cd)) {
return false;
}
Cd other = (Cd) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entity.Cd[ id=" + id + " ]";
}
}
package entity;
import entity.Book;
import java.util.*;
import javax.persistence.*;
public class Demo {
public static void main(String[] args) {
Artist a1 = new Artist("Abdelmalik", "Berrada");
Artist a2 = new Artist("Yassine", "Daoudi");
Artist a3 = new Artist("Jamel", "Debbouze");
Cd cd1 = new Cd("Burnout City", 22.2F, "cd Rock");
Cd cd2 = new Cd("Gun n Roses", 32.2F, "cd Hard Rock");
Cd cd3 = new Cd("Nirvana", 62.2F, "cd Metal");
ArrayList <Cd> lCd1 = new ArrayList<Cd>();
ArrayList <Artist> lArt1 = new ArrayList<Artist>();
lCd1.add(cd1);
lCd1.add(cd2);
lArt1.add(a2);
lArt1.add(a3);
a1.setCd(lCd1);
cd3.setArtists(lArt1);
//persist(a1);
persist(cd3);
}
private static void persist(Object object) {
EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory("simple-jpaPU");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
try{
em.persist(object);
em.getTransaction().commit();
}
catch(Exception e){
e.printStackTrace();
em.getTransaction().rollback();
}
finally{
em.close();
}
}
} |
Relation bidirectionnelle ManyToMany non persistée
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