1
我正在建模一個數據庫。
有TRIPLE
其中包含三個CONCEPT
。所以類TRIPLE
的主鍵是三個uri
在一起。 (一個概念可能在不同的TRIPLE
)。
另外TRIPLE
與另一個類,ANNOTATION
有關,這裏是問題,triple_id
怎麼能被識別?但首先,如果構建此Id組合是正確的。 爲模型:Hibernate @id複合
Concept.java
@Entity
@Table(name = "concept")
public class Concept implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private String id;
private List<TripleDBModel> triples;
@ManyToMany(
cascade={CascadeType.ALL},
fetch=FetchType.LAZY,
mappedBy = "concepts"
)
public List<TripleDBModel> getTriples() {
return triples;
}
public void setTriples(List<TripleDBModel> triples) {
this.triples = triples;
}
ConceptPk.java
@Embeddable
public class ConceptPk implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private String uri;
public ConceptPk(String uri, String label){
this.uri = uri;
}
public ConceptPk(){
super();
}
@Id
@Column(name = "uri", length = 100, unique = true, nullable = false)
public String getUri() {
return uri;
}
public void setUri(String uri) {
this.uri = uri;
}
}
Triple.java
@Entity
@IdClass(ConceptPk.class)
@Table(name = "triple")
public class TripleDBModel {
protected List<Annotation> annotations;
protected String conceptUriSubject;
protected String conceptUriObject;
protected String conceptUriPredicate;
@ManyToMany(
cascade={CascadeType.ALL},
fetch=FetchType.LAZY
)
@JoinTable(name = "triple_has_concept",
[email protected](name="uri"),
[email protected](name="triple_id")) //What shoul I write here???
public List<Annotation> getAnnotations() {
return annotations;
}
public void setAnnotations(List<Annotation> annotations) {
this.annotations = annotations;
}
@Id public String getConceptUriSubject() {
return conceptUriSubject;
}
public void setConceptUriSubject(String conceptUriSubject) {
this.conceptUriSubject = conceptUriSubject;
}
@Id public String getConceptUriObject() {
return conceptUriObject;
}
public void setConceptUriObject(String conceptUriObject) {
this.conceptUriObject = conceptUriObject;
}
@Id public String getConceptUriPredicate() {
return conceptUriPredicate;
}
public void setConceptUriPredicate(String conceptUriPredicate) {
this.conceptUriPredicate = conceptUriPredicate;
}
}
在此先感謝!
謝謝,我選擇第二個選項和semms工作 – 2011-04-12 11:10:47