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JDO Doc
4

javax.jdo.annotations.ForeignKey

get methods) Annotation for a database foreign-key. Corresponds to the xml element "foreign-key". Since: JDO 2.1 Column[] columns Columns that compose this foreign key. Columns that compose this foreign key. Returns: the columns that compose this foreign key Default value: {} Since: JDO 2.1 String deferred
JDO Doc
4

javax.jdo.PersistenceManager

1.0 T getObjectById(Class cls, Object key) Looks up the instance of the given type with the given key. Looks up the instance of the given type with the given key. Parameters: cls - The type of object to load key - either the string representation of the object id, or an object representation
JPA Doc
4

javax.persistence.JoinColumn

: unidirectional one-to-many association using a foreign key mapping // In Customer class @OneToMany ... provider. Default value: true Since: JPA 1.0 String name (Optional) The name of the foreign key column. (Optional) The name of the foreign key column. The table in which it is found depends upon the context
JPA Doc
4

javax.persistence.EntityManager

key, and to query over entities. The set of entities that can be managed by a given EntityManager ... (Class entityClass, Object primaryKey) Find by primary key. Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence
JPA Doc
4

JPA Annotations for Classes

are useful in representing composite primary keys as explained in the Primary Key section of the ObjectDB manual.
JPA Doc
4

JPA Annotations for Value Generation

Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. At the field level, the @GeneratedValue with an optional GenerationType strategy is specified: The @GeneratedValue annotation
Manual
4

JPA Persistable Types

, however, do not have an identity (primary key) of their own which leads to some limitations (e.g ... and arrays and keys and values in maps) are either null values or instances of persistable types. In
Manual
4

ORDER BY clause (JPQL / Criteria API)

. The following query returns Country objects ordered by currency as the primary sort key and by name as the secondary sort key: SELECT c.currency, c.name FROM Country c ORDER BY c.currency, c.name
Result
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What is new in ObjectDB 2.0?

ObjectDB 2.0 supports many new features and improvements, including: Most of the features of the new JPA 2.0 and JDO 2.2 APIs. User defined IDs (primary key) and sequences. Support of unlimited index keys size. SQL like queries ("select from ... where ..."). Real non blocking multithreading in
JDO Doc
4

javax.jdo.identity.ByteIdentity

 pcClass, Byte key) Constructor with class and key. Constructor with class and key. Parameters: pcClass - the target class key - the key Since: JDO 1.0 ByteIdentity(Class pcClass, Byte key) Constructor with class and key. Constructor with class and key. Parameters: pcClass - the target class key