Internal Website Search

> Designates a class whose mapping information is applied to the entities that inherit from it. A mapped superclass has no separate table defined for it. A class designated with the MappedSuperclass annotation can be mapped in the same way as

> Return the Map-valued attribute declared by the managed type ... ="description"> Return the Map-valued attribute declared by the managed type that corresponds ... ) Return the Map-valued attribute declared by the managed type

. If the join is for a map key for an element collection, the foreign key column is in the collection table for the map value. If the join is for a map key ... relationship using a foreign key mapping strategy, the foreign key column for the map key is in the table

) Specifies the map key for associations of type java.util.Map when the map key is itself the primary key or a persistent field or property of the entity that is the value of the map. If a persistent field or

can be used in the SELECT clause. Collection and map fields cannot be included in the results

Queries ObjectDB manages a BTree for every index. A BTree is an ordered map data

the execution time of object oriented applications significantly. For instance, collection and map

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB

> Orphan removal can also be set for collection and map fields. For example:

_collections_and_maps">section 4.4). Therefore, by default, String and Date