我在休眠中使用级联操作时遇到了一些问题。我有一个实体（TripleDBmodel），实体的主键是使用对三个对象（概念）的引用创建的。它工作完美，我还在这些对象上添加了级联操作，我认为 TripleDBModel 实体的保存操作也将保存数据库中不存在的概念。但是它不是那样工作的。
@Entity
@Table(name = "triple")
public class TripleDBModel implements java.io.Serializable{
private Concept subject;
private Concept object;
private Concept predicate;
public TripleDBModel(){
}
@Id
@ManyToOne(targetEntity=Concept.class)
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
@JoinColumn(name="subject_uri")
public Concept getSubject() {
return subject;
}
public void setSubject(Concept subject) {
this.subject = subject;
}
@Id
@ManyToOne(targetEntity=Concept.class)
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
@JoinColumn(name="object_uri")
public Concept getObject() {
return object;
}
public void setObject(Concept object) {
this.object = object;
}
@Id
@ManyToOne(targetEntity=Concept.class)
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
@JoinColumn(name = "predicate_uri")
public Concept getPredicate() {
return predicate;
}
public void setPredicate(Concept predicate) {
this.predicate = predicate;
}
}
@Entity
@Table(name = "concept")
public class Concept implements java.io.Serializable {
private String uri;
private String label;
// private List<TripleDBModel> triple;
public Concept(String uri, String label) {
this.uri = uri;
this.label = label;
this.ontologies = new ArrayList<Ontology>();
}
public Concept() {
super();
}
@Id
@Column(name = "uri", length = 255, unique = true, nullable = false)
public String getUri() {
return uri;
}
public void setUri(String uri) {
this.uri = uri;
}
....
}