190 | Should derived fields of an EmbeddedId be manually maintained by app code? @EmbeddedId, am I responsible for maintaining the derived fields of the @EmbeddedId? I could not find ... "ECompoundKeyMapSubItem", identified by their keys. The embeddedId for the item class, ECompoundKeyMapItemId ... ") annotation. Likewise the ECompoundKeyMapSubItem class has a PK which is an embeddedId |
157 | Embedded Entity in EmbeddedId not persisted. Error 631 at select..EmbeddedId; import javax.persistence.Entity; import javax.persistence.EntityManager; import javax ... static class A { @EmbeddedId private AId id; public |
157 | Efficient query on EmbeddedIdHi! 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. My question |
157 | Can't modify @EmbeddedId in ObjectDB ExplorerHi! 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 |
152 | EmbeddedId with Generated field value; } ********* Solution 2 ********* @Entity public class A { @EmbeddedId private CompositePK pk |
102 | javax.persistence.EmbeddedIdjavax.persistence Annotation EmbeddedId Target: Fields (including property get methods) Applied ... . There must be only one EmbeddedId annotation and no Id annotation when the EmbeddedId annotation is used ... within the embeddable class. The MapsId annotation may be used in conjunction with the EmbeddedId annotation to specify |
45 | JPA Primary Key an embeddable class: @Entity public class Project { @EmbeddedId ProjectId id ... that is annotated with @EmbeddedId and contains an instance of that embeddable class. When using this form ... query run performance: @Entity public class Event { @EmbeddedId EventId id |
26 | ObjectDB Object Database Features - multiple @Id fields or a @EmbeddedId field. Primary Key Data Types Primitives (boolean, byte, short |
15 | javax.persistence.MapsId 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 ... ; ... } // dependent entity uses EmbeddedId for composite key @Embeddable |
7 | javax.persistence.AttributeOverride; ... } Example 3: @Entity public class PropertyRecord { @EmbeddedId |
