I wanted to frame Hibernate OneToMany relationship where Parent has a composite primary key and Child has a primary key (hibernate-auto generated). Below is my working sample code :
class Parent{
@EmbeddedId
private ParentPk parentPk;
@OneToMany( mappedBy="parent")
private List<ChildType1>;
@OneToMany( mappedBy="parent")
private List<ChildType2>;
@OneToMany( mappedBy="parent")
private List<ChildType3>;
//--setters and getters
}
@Embeddable
public class ParentPk {
private Long parentId;
private BigDecimal version;
//..setters and getters
}
class ChildType1{
@Id
private Long childId;
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumns({ @JoinColumn(name = "parentId"),
@JoinColumn(name = "version") })
private Parent parent;
//..other fields and setters and getters
}
//--ChildType2 and ChildType3 like above
But now I wanted to model above as OneToMany unidirectional relationship, ie, a child should not reference the parent (want to omit Parent instance in the child class). Is it possible?
An example approach:
@Entity
class Parent {
@EmbeddedId
private ParentPk parentPk;
@OneToMany
@JoinColumns({
@JoinColumn(name = "parentId", referencedColumnName = "parentId"),
@JoinColumn(name = "version", referencedColumnName = "version")
})
private List<ChildType1> children1;
// exactly the same annotations as for children1
private List<ChildType2> children2;
// exactly the same annotations as for children1
private List<ChildType3> children3;
//..other fields and setters and getters
}
@Entity
class ChildType1 {
@Id
private Long childId;
//..other fields and setters and getters
}
//--ChildType2 and ChildType3 like above
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