About @EmbeddedId

manual

JPA Primary Key

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... public class Project { @EmbeddedId javax.persistence.EmbeddedId JPA annotation ... a single primary key field that is annotated with @EmbeddedId javax.persistence.EmbeddedId JPA annotation ... Page... public class Event { @EmbeddedId javax.persistence.EmbeddedId JPA annotation ...

 
forum_thread

Should derived fields of an EmbeddedId be manually maintained by app code?

If I have an Entity which has a primary key which is derived and I am implementing it using @EmbeddedId, am I responsible for maintaining the derived fields of the @EmbeddedId? I could not find anything in the JPA 2.0 spec http://download.oracle.com/auth/otn-pub/jcp/persistence-2.0-fr-oth-JSpec/persistence-2_0-final-spec.pdf?e=1317047713&h=54831c176e81a244a4c309e13eba0b27 which tells me what to expect. ... key which is derived and I am implementing it using @EmbeddedId, am I responsible for maintaining the derived fields of the @EmbeddedId? I could not find anything in the JPA 2.0 spec ... the test fails where it attempts to find an item with an @EmbeddedId ... ECompoundKeyMapItem item = container. getMapItem ...

 
api-jpa

JPA Annotations for Fields

Reference (JavaDoc) of JPA 2 field annotations, including @Basic, @Embedded, @EmbeddedId, @Version, @Transient, @Enumerated, @MapKeyEnumerated, @Temporal and @MapKeyTemporal. The way a field of a persistable class is managed by JPA can be set by the following annotations: javax.persistence.Basic javax.persistence.Embedded javax.persistence.ElementCollection javax.persistence.Id ...

 
api-jpa

javax.persistence.EmbeddedId

Applied to a persistent field or property of an entity class or mapped superclass to denote a composite primary key that is an embeddable class.(Annotation of JPA)

 
forum_thread

EmbeddedId with Generated field value

@Entity public class A { @EmbeddedId private Id id; } @Embeddable public class Id { @Generated private long id; private String zone; } How can I get the field Id.id auto-incremented?   #1 2012-12-06 17:29 I know the following 2 ways to declare a composite Primary key: ********* Solution 1 ********* @ ...

 
forum_thread

Efficient query on EmbeddedId

Hi! I have an entity class with an @EmbeddedId (field1 int and field2 int). Based on the manual, I understand that making a query just on entity.id.field1 is efficient. Of course, making a query containing the whole EmbeddedId is the ideal case, and I use it, but I need more use cases. ... Hi! I have an entity class with an @EmbeddedId (field1 int and field2 int). Based on the manual, I understand that ...

 
forum_thread

Can't modify @EmbeddedId in ObjectDB Explorer

Hi! There is entity Journal with @EmbeddedId JournalId. Id's content can't be seen/modified from ObjectDB Explorer from its class. Ok, I get this. It's an @EmbeddedId, so it should depend only on its parent. Problem: id's content can't be modified through its parent neither. Scenario: open db in ObjectDB Explorer, open entity Journal, expand the id, try to modify date/id, save, then refresh data / reopen db, and you'll see that it wasn't modified. Any solutions? ... Hi! There is entity Journal with @EmbeddedId JournalId. Id's content can't be seen/modified from ... Explorer from its class. Ok, I get this. It's an @EmbeddedId, so it should depend only on its parent. Problem: id's ...

 
forum_thread

Query on Embedded Primary Key?

Hi, I am trying to use Embedded Primary Key - but seems I can't retrieve them correctly with the query below - the query seem to work fine for other field (in the code = primkeycopy). The error I get when is below - it complains about a casting issue. Let me know how to fix it - Thanks  EKK   #1 2014-06-16 22:50 Hi, I am trying to use Embedded Primary Key - but seems I can't retrieve them correctly with the ...

 
issue

JPA Composite Key make Object Db throws "Unexpected exception (Error 990)"

Hello Object Db community :) I am using this wonderful library and I caught a strange exception while testing the "composite key" feature in JPA. Let's see what I am doing : @Entity public class Book {     @EmbeddedId BookId id; } @Embeddable Class BookId {     Integer bookIdCountry;     ECountry country; } My BookId contains 2 attributes: One Integer and one enum. Bug Version: 2.4.0 Priority: Normal Status: Fixed Replies: 3 Type:  Bug ...

 
api-jpa

javax.persistence.MapsId

Designates a ManyToOne or OneToOne relationship attribute that provides the mapping for an EmbeddedId primary key, an attribute within an EmbeddedId primary key, or a simple primary key of the parent entity.(Annotation of JPA)