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Manual
6

JPA Entity Fields

(Mapped By) fields Primary key (ID) fields Version field The first three groups (transient, persistent ... two groups (primary key and version fields) can only be used in entity classes. Primary key fields are discussed in the Primary Key section. Transient Fields Transient entity fields are fields
Result
6

Activation completed successfully!

> elements, one per licensed machine. Any non matching activation code is quietly ignored by ObjectDB. If you are using the ObjectDB OEM license - you should only activate ObjectDB on developer machines. Classes that are enhanced by the ObjectDB Enhancer (when using the OEM license) are signed
Forum
6

2.7.3_03 Erroneous "Attempt to modify a primary key of a managed object"

key of a managed object", but my application is not trying to change the primary key.  (ObjectDB ... attached. Thanks. Could you please provide details on the primary key of JdoBlob2? Is it composite ... a combination of class + primary key and therefore it seems a bit strange to use it as the type
Manual
6

Retrieving JPA Entity Objects

of entity classes and to keep them simple as possible. Retrieval by Class and Primary Key Every entity object can be uniquely identified and retrieved by the combination of its class and its primary key ... whose primary key is 1: Employee employee = em.find(Employee.class, 1); Casting of the retrieved
Manual
6

Defining a JPA Entity Class [2011-02-11]

for persistent fields, how to define and use a primary key and what a version field is and how to use it. If you are already familiar with JPA you might have noticed that the Point entity class has no primary key ... defined primary key is not required. On the other hand, ObjectDB also supports explicit JPA primary
Manual
6

Defining a JPA Entity Class

for persistent fields, how to define and use a primary key and what a version field is and how to use it. If you are already familiar with JPA you might have noticed that the Point entity class has no primary key ... defined primary key is not required. On the other hand, ObjectDB also supports explicit JPA primary
Forum
5

Index on map key

Is there a way to create an Index with @Index on the key of a map? Indexes on map keys as well as queries on map keys are currently not supported. But as a workaround you can use a collection ... ();         Query query = em.createQuery(             "SELECT o FROM MyEntity o JOIN o.map e WHERE e.key
Forum
5

More Efficient Primary Keys

Can you give us a recommendation as we can represent the Key (UUID) most efficient? Both in terms ... . We already need the key before the entities are persisted so that we can build even references. a) Composite Primary Key  with two Longs b) Embedded Primary Key with two Longs c) Furthermore, as String
Issue
5

Eager Fetch of Map with Entities as Keys

Loading eagerly a map that uses entity objects as keys is currently unsupported, if the equals and hashCode methods of the keys are based on the key entity persistent content, since that content ... ();         MyKeyEntity key = new MyKeyEntity("key");         em.persist(key);         entity.map
Forum
5

problem when primary key value is zero

and recommendations, in particular there are some primary keys with value == 0. These cause problems for objectDB, typically "JPA Unexpected argument as primary key". When using eclipselink, there is a workaround ... have a zero value in primary key column -->