About mappedBy
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. ...
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> ...
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; ...
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 , ...
OneToMany.mappedBy
The field that owns the relationship.(Annotation Element of javax.persistence.OneToMany)
OneToOne.mappedBy
(Optional) The field that owns the relationship.(Annotation Element of javax.persistence.OneToOne)
ManyToMany.mappedBy
The field that owns the relationship.(Annotation Element of javax.persistence.ManyToMany)
Key.mappedBy
Name of a member in the value class where this key is stored.(Annotation Element of javax.jdo.annotations.Key)
Value.mappedBy
Name of a member in the key class where this value is stored.(Annotation Element of javax.jdo.annotations.Value)
Element.mappedBy
Name of the member in the target class that forms a bidirectional relationship with this member.(Annotation Element of javax.jdo.annotations.Element)
