About mapping

api-jpa

JPA Annotations for Mapping (ORM)

Reference (JavaDoc) of JPA 2 ORM annotations.... The following JPA annotations and enums are designated for mapping a JPA object model to a relational database, and are not required by ...

 
faq

Is ObjectDB better than Object Relational Mapping (ORM)?

As noted above, using ObjectDB instead of a relational database and ORM combination is easier and leads to better performance. ORM tools, however, are very useful where the use of a relational database is mandatory (e.g. as a result of a customer reques ...

 
manual

JPA Persistable Types

Explains how JPA manages types, including entity classes, embeddable classes, primitive types, wrappers, string, date, enum, collections and maps.... JPA enum Type used to indicate a specific mapping of java.util.Date or java.util.Calendar. See JavaDoc Reference ... JPA enum Type used to indicate a specific mapping of java.util.Date or java.util.Calendar. See JavaDoc Reference ...

 
manual

JPA Persistence Unit

Explains how to define a JPA persistence unit in the persistence.xml file.... topics: persistence.xml XML Mapping Metadata Managed Persistable Classes ... </provider > <mapping-file > META-INF/mappingFile.xml </mapping-file > <jar-file > packedEntity.jar ...

 
faq

Can I use ObjectDB to access a relational database?

... Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or ...

 
manual

JPA Entity Fields

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... JPA annotation The simplest type of mapping to a database column. See JavaDoc Reference Page... - for ... JPA annotation The simplest type of mapping to a database column. See JavaDoc Reference Page... is ... JPA annotation The simplest type of mapping to a database column. See JavaDoc Reference Page... ( ...

 
manual

Collections in JPQL and Criteria Queries

Shows how collections and maps can be used in JPQL queries. Collections may appear in JPQL queries: as parameters - when collections are assigned as arguments. as  path expressions - in navigation to persistent collection fields. This page covers the ...

 
api-jpa

createEntityManager(map)

Create a new application-managed EntityManager with the specified Map of properties.(Method of javax.persistence.EntityManagerFactory)

 
api-jpa

javax.persistence.AssociationOverride

Used to override a mapping for an entity relationship.(Annotation of JPA)

 
api-jdo

getPersistenceManagerFactory(overrides, name, resourceLoader, pmfLoader)

Returns a PersistenceManagerFactory configured based on the properties stored in the resource at name, or, if not found, returns a PersistenceManagerFactory with the given name or, if not found, returns a javax.persistence.EntityManagerFactory cast to a PersistenceManagerFactory.(Static Method of javax.jdo.JDOHelper)