[英]Hibernate @id composite
我正在建模一個數據庫。
有包含三個CONCEPT
TRIPLE
。 所以TRIPLE
類的主鍵是三個uri
。 (一個概念可能在不同的TRIPLE
)。
另外TRIPLE
與另一個類ANNOTATION
,這里的問題是,如何識別triple_id
?? 但首先,如果構建這個 Id 組合是正確的。 要建模:
概念.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;
}
概念包
@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;
}
}
三重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",
joinColumns=@JoinColumn(name="uri"),
inverseJoinColumns=@JoinColumn(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;
}
}
提前致謝!!
您可以使用這樣的 Id 類:
class TripleId implements Serializable {
@Column(...)
private String conceptUriSubject;
@Column(...)
private String conceptUriObject;
}
並在 Triple 中使用它:
@Entity
@Table(name = "triple")
public class TripleDBModel {
@EmbeddedId
private TripleId id;
...
}
另請注意,您可以提供多個連接列: inverseJoinColumns= {@JoinColumn(name="subjectUri"), @JoinColumn(name="objectUri"), ... }
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