 53 | Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As ... that is absent from other object oriented databases. Entity Identification Every entity object in |
32 | Callback methods are user defined methods that are attached to entity lifecycle events ... methods are methods that are defined within an entity class. For example, the following entity class defines all the supported callback methods with empty implementations:
@Entity
public static class |
31 | The ObjectDB configuration file contains one root element with seven subelements:
...
...
<entities> ... entities>
...
...
...
... |
31 | is represented by a Guest JPA entity object and all the Guest entity objects are stored in an ObjectDB |
31 | is represented by a Guest JPA entity object and all the Guest entity objects are stored in an ObjectDB |
31 | that has signed the guestbook is represented by a Guest JPA entity object and all the Guest entity |
31 | Method javax.persistence.EntityManager void detach( Object entity ) Remove the given entity from the persistence context, causing a managed entity to become detached. Unflushed changes made to the entity if any (including removal of the entity), will not be synchronized to the database. Entities |
31 | Method javax.persistence.EntityManager void lock( Object entity, LockModeType lockMode ) Lock an entity instance that is contained in the persistence context with the specified lock mode type. If a pessimistic lock mode type is specified and the entity contains a version attribute |
31 | Method javax.persistence.EntityManager void lock( Object entity, LockModeType lockMode, Map properties ) Lock an entity instance that is contained in the persistence context ... is specified and the entity contains a version attribute, the persistence provider must also perform |
30 | Method javax.persistence.spi.ProviderUtil LoadState isLoaded( Object entity ) If the provider determines that the entity has been provided by itself and that the state of all attributes ... . If the provider determines that the entity has been provided by itself and that not all attributes |
