About mappedBy

manual

JPA Entity Fields

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... See JavaDoc Reference Page... ( mappedBy OneToMany.mappedBy annotation element The field that owns the relationship. ...

 
forum_thread

mappedBy problem

If I put the mappedBy element to the @OneToMany, the owned side (the many side) will never persist ! for example @Entity public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public Long id; public String name; @OneToMany(targetEntity=Address.class,mappedBy="employee") public List<Address> addresses; }   @Entity... 18:03 If I put the mappedBy element to the @OneToMany, the owned side (the many side) will never ... ( targetEntity = Address. class , mappedBy = "employee" ) public List<Address> ...

 
issue

new objects not available in mappedBy associations

Given a mappedBy association: e.g: @OneToMany(mappedBy="department") public List <Employee> employees;   creating a new mapped class, e.g. new Employee, won't result in this object being available in the same transaction: ie: for (Employee e : department.employee) won't include the new object, even if it is persisted, and even if the transaction is committed??  ... 03:21 Given a mappedBy association: e.g: @OneToMany(mappedBy="department") public List <Employee> employees;   ...

 
forum_thread

LEFT (OUTER) JOIN problem when mappedBy is defined

Hi all, I want to get objects with their lists, even when the lists are empty. So I've witten this query: "SELECT i FROM Invoice i LEFT OUTER JOIN i.itemList items" But this query never returns invoices without items! Only invoices with items. When I remove mappedBy from @OneToMany annotation, LEFT JOIN works correctly. Is this normal behaviour? Thank you Michael   Sample application ... items! Only invoices with items. When I remove mappedBy from @OneToMany annotation, LEFT JOIN works correctly. Is this ... {   @ OneToMany ( mappedBy = "invoice" , fetch = FetchType . EAGER , ...

 
api-jpa

OneToMany.mappedBy

The field that owns the relationship.(Annotation Element of javax.persistence.OneToMany)

 
api-jpa

OneToOne.mappedBy

(Optional) The field that owns the relationship.(Annotation Element of javax.persistence.OneToOne)

 
api-jpa

ManyToMany.mappedBy

The field that owns the relationship.(Annotation Element of javax.persistence.ManyToMany)

 
api-jdo

Key.mappedBy

Name of a member in the value class where this key is stored.(Annotation Element of javax.jdo.annotations.Key)

 
api-jdo

Value.mappedBy

Name of a member in the key class where this value is stored.(Annotation Element of javax.jdo.annotations.Value)

 
api-jdo

Order.mappedBy

Name of a field or property in the target class that acts as the ordering field or property for this member.(Annotation Element of javax.jdo.annotations.Order)