休眠/@ElementCollection和@XmlRootElement

我正在与Hibernate作斗争,找不到一个可行的解决方案来做我想做的事。这是一个网络服务btw。

我有一个对象列表(Composant),它必须嵌入到主对象(Projet)中。我想在我的数据库(PostgreSQL)中持久化这两者。为此,我将其设置为:

我的第一个表名为T_PROJET 我在ComponentList上苦苦挣扎的列表 和到期日PRJ_date

获得了自动生成的id:COMP\u id。 A值COMP\u MONTANT

在我的HMI上,我可以用至少一个组件创建一个项目,但我可以添加更多组件(一个项目最多5个组件),组件将保存为列表。

以下是我倾向于在HMI上生成的JSON示例:

{
"name":"Example",
"dateLimite":"2018-08-08",
"composant_1": {
    "name":"Vol",
    "montant": 1200,
    "importance":1
},
"composant_2": {
    "name":"Truc",
    "montant": 1200,
    "importance":1
},
"composant_3": {
    "name":"Bidule",
    "montant": 1200,
    "importance":1
},
"composant_4": {
    "name":"Machin",
    "montant": 1200,
    "importance":1
},
"composant_5": {
    "name":"Wesh",
    "montant": 1200,
    "importance":1
}
}

@Entity
@Table(name = "T_PROJET")
@XmlRootElement
public class Projet implements Serializable{

private static final long serialVersionUID = 1L;

private String name;
private List<Composant> composants;
private Date dateLimite;

public Projet() {
    super();
}

public Projet(String name, List <Composant> composants, Date dateLimite) {
    this.name = name;
    this.composants = composants;
    this.dateLimite = dateLimite;
}

@Id
@Column(name = "PRJ_NOM", nullable = false)
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

@ElementCollection
@CollectionTable(name="T_COMPOSANT", joinColumns = @JoinColumn(name = "COMP_ID"))
@Embedded
@Column(name="COMP_ID", nullable = true)
public List<Composant> getComposants() {
    return composants;
}

public void setComposants(List <Composant> composants) {
    this.composants = composants;
}

@Column(name="PRJ_DATE")
public Date getDateLimite() {
    return dateLimite;
}

public void setDateLimite(Date dateLimite) {
    this.dateLimite = dateLimite;
}
}

和“Composant”:

@Embeddable
@Table(name = "T_COMPOSANT")
@XmlRootElement
public class Composant implements Serializable {
private static final long serialVersionUID = 1L;
private int composant_id;
private String name;

private int montant;

private int importance;

public Composant(){
    super();
}

public Composant(final int composant_id, final String name, final int montant, final int importance) {
    this.composant_id = composant_id;
    this.name = name;
    this.montant = montant;
    this.importance = importance;
}

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "COMP_ID")
public int getComposant_id() {
    return composant_id;
}

public void setComposant_id(int composant_id) {
    this.composant_id = composant_id;
}



@Column(name = "COMP_NOM",nullable = true)
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

@Column(name="COMP_MONTANT", nullable = true)
public int getMontant() {
    return montant;
}

public void setMontant(int montant) {
    this.montant = montant;
}

@Column(name = "COMP_IMPORTANCE", nullable = true)
public int getImportance() {
    return importance;
}

public void setImportance(int importance) {
    this.importance = importance;
}
}

我确信我错过了一些关于@ElementCollection和@embeddeble注释的内容,但我不知道具体在哪里(浏览了Antonio Goncalves的书,但没有答案,或者我就是看不懂)。

谢谢你的帮助!