ObjectDB Database Search

, as explained in the previous section . The Identity Strategy The IDENTITY strategy is very similar ... = GenerationType . IDENTITY ) long id; : } The IDENTITY strategy also generates an automatic value during commit for every new entity object. The difference is that a separate identity generator is managed

JPA Enum Constant in jakarta.persistence.GenerationType IDENTITY Indicates that the persistence provider must assign primary keys for the entity using a database identity column. May be used to generate primary keys of type Long, Integer, long , or int . Since: JPA 1.0

. In addition, only instances of entity classes preserve identity and are stored ... , however, do not have an identity (primary key) of their own which leads to some limitations (e.g

, comparing the content rather than the identity . Date values can be compared by using any comparison operator ... , comparing the content rather than the identity . Values of the boolean and Boolean types can be compared by

of the query result cache. Caching results is very useful for recurring queries with identical arguments

) FROM Country AS c This query is identical to the previous query above except that now the result

/ Write operations. The other (slave) nodes in the cluster manage identical copies of the same database

with the same identity (i.e. same type and primary key). If the EntityManager does not manage such an entity

the different notation, named parameters and ordinal parameters are identical . Named parameters can provide

this regard, orphanRemoval=true and cascade=CascadeType.REMOVE are identical , and if orphanRemoval

and do not have their own separate identity . Automatic Primary Key By default, the primary key

.removeChild(ContainerBase.java:1049) [...] Caused by: javax.jdo.JDONullIdentityException: The identity must not be null.         at javax.jdo. identity .SingleFieldIdentity ... . identity .ObjectIdentity. (ObjectIdentity.java:60)         at com

given persistent entity identity (defined by an entity type and primary key) there is at most one entity ... has no persistent identity , and is not yet associated with any persistence context. A managed entity is an instance with a persistent identity that is currently associated with a persistence context. A detached

, and IDENTITY . The AUTO generation strategy may expect a database resource to exist, or it may attempt ... IDENTITY Indicates that the persistence provider must assign primary keys for the entity using a database identity column. May be used to generate primary keys of type Long, Integer, long , or int

, but a distinct Java object identity . If the given entity is detached, the returned entity has the same persistent identity . This operation cascades to every entity related by an association marked cascade

,String ident ){                 ... ;             identifier = ident ;  

? Results with identical 2nd element will not be filtered anyway if the first element is different. Only results in which all the elements are identical are filtered.   support Support aaahh.. okay

and removed from memory (checked in the Profiler) 4. nevertheless there are lots of identical Copies ... check it tomorow). Arne Arne Stocker create_cound and close_count are identical . I made create_count

("MyEntity$ identity "); long currentValue = seq.currentValue(); // I would like to change currentValue ... ; @GeneratedValue(strategy=GenerationType. IDENTITY )     private Long id; }   Tsu

. IDENTITY ) private Long id; @Unique @Persistent(nullValue=NullValue.EXCEPTION) private String username ... @GeneratedValue(strategy=GenerationType. IDENTITY )         private

(strategy = GenerationType. IDENTITY ). 5. Any ideas why this would happen? @Stateless ClientC ... () should just return the "long" field which is @Id @GeneratedValue(strategy = GenerationType. IDENTITY

://www.objectdb.com/java/jpa/entity/generated :     Unlike AUTO and IDENTITY ... implementation uses its own default strategy. IDENTITY - implementation depends on the database

both master and slave (directly through /$replication path on slave) [ IDENTICAL ] 6) restart ODB server ... Failed to synchronize] 8) repeated N5. [NOT IDENTICAL ] 9) Stoped slave ODB server

annotations. You can have a bidirectional one to one association, but it cannot be based on identical primary ... , even if it is identical to the primary key (causing duplication). Accordingly, you must set the reference

. IDENTITY ) public Long id; public String name; @OneToMany(targetEntity=Address.class,mappedBy="employee ... . IDENTITY ) public Long id; public String line; @ManyToOne public Employee employee; } The address

I'm trying to work out the most efficient way to build a query that can compare two collections for identical members. Something like: SELECT o FROM Object o WHERE o.someCollection CONTAINS MEMBER ... collections by identical hash code. Candidate collections should then be further filtered by checking

global sequence . The name of an identity sequence (specific per entity class) is entityName + "$ identity " . User defined generators ( sequence and table ) have explicit names. support Support I

a standalone environment. I get two stack traces (one for each class) that are identical ... - the stack traces might be similar but not identical and that additional info could help. support Support

") @GeneratedValue(strategy = GenerationType. IDENTITY ) private int id; @Column(name = "username") private ... { @Id @GeneratedValue(strategy = GenerationType. IDENTITY ) @Column(name = "id") private int id; @Column

JPA Annotation Embeddable Target: TYPE Implemented Interfaces: Annotation Declares a type whose instances are stored as an intrinsic part of an owning entity, sharing the identity of the entity. A single embeddable type may be used as the type of multiple persistent fields or properties

when this callback occurs only for UUID , TABLE , or SEQUENCE primary key generation. For IDENTITY

int , the provider selects between TABLE , SEQUENCE , and IDENTITY . The AUTO generation strategy

.jar ) was added to ObjectDB distribution in the new build. It is identical to objectdb.jar

" but OjectDb does not. Any suggestions? At the momment I am working on generating 2 jars with identical

class Node { @Id     @GeneratedValue(strategy=GenerationType. IDENTITY ) int id

of type EntityZ from database. Several threads use the identical instance of EntityZ. Thread1 access

. IDENTITY ) private Integer id; @Access(AccessType.PROPERTY) @Embedded private Profile profile; public

="0") public class Nodes { @Id     @GeneratedValue(strategy=GenerationType. IDENTITY

final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType. IDENTITY ) private Long

are also identical (shared) if defined in the persistence.xml in the CoreEJB module. If SpecWeb1

objects have identity and support multiple references without duplication. All the other types

management of identity ) are built-in to JDO.  We have recently migrated projects for JPA

JDO supports two modes of persistable classes that can be set by the following annotations: Non persistable classes that should be enhanced (because of accessing persistent fields of other classes directly) can be marked with: The identity mode of persistence capable classes can be specified by using:

static javax.persistence . GenerationType . IDENTITY ; import static javax.persistence . Persistence ... ( strategy = IDENTITY )          public int id ;       ... ;   @Id          @GeneratedValue ( strategy = IDENTITY )  

;   logger.debug(" Ident : "+ ident );     result = em.createQuery("Select c from Customer c where c.identifier=:id", Customer.class).setParameter("id", ident ).getSingleResult ... at the top): 09:08:49.496 [http-bio-0.0.0.0-8080-exec-9] DEBUG s.t.c.o.OrganizationService - Ident : default

pdnsrtlonmo42-WSAgent-1-Existing/0 ERROR WorkflowRunner - The identity must not be null. javax.jdo.JDONullIdentityException: The identity must not be null. at javax.jdo. identity .SingleFieldIdentity.assertKeyNotNull(SingleFieldIdentity.java:92) at javax.jdo. identity .ObjectIdentity. (ObjectIdentity.java:60

more that once even if there are no 2 arrays or collections that are identical . For example if obj1 has [0

because the size of the arrays is identical to the cache page configuration. We use the ObjectDB as

. Embeddable classes, however, do not have an identity (primary key) of their own which leads to some

which hold much memory, if we execute several transactions on the identical entity manager