About fields

manual

JPA Entity Fields

Explains how to define and use primary keys in JPA, including composite and embedded primary keys. Fields of persistable user defined classes (entity classes, embeddable classes ... into the following five groups: Transient fields Persistent fields Inverse (Mapped By) fields Primary key (ID) ...

 
api-jdo

javax.jdo.spi.StateManager

This interface is the point of contact between managed instances of PersistenceCapable classes and the JDO implementation.(Interface of JDO)

 
api-jdo

javax.jdo.spi.PersistenceCapable.ObjectIdFieldManager

This interface is a convenience interface that allows an instance to implement both ObjectIdFieldSupplier and ObjectIdFieldConsumer.(Interface of JDO)

 
manual

Schema Update

Explains how to handle JPA/JDO database schema evolution in ObjectDB.... element supports renaming packages, classes and fields in ObjectDB databases as a complementary operation to renaming or moving ... of <class> subelements for renaming classes and fields in that package. The <package> elements above specify ...

 
manual

Database Schema Evolution

Explains how ObjectDB handles automatically schema changes.... and modifying constructors, methods and non persistent fields. However, additions, deletions and modifications to the persistent fields of an entity class are detected by ObjectDB. New entity objects have to ...

 
api-jdo

javax.jdo.spi.PersistenceCapable.ObjectIdFieldSupplier

This interface is used to provide fields to the Object id instance.(Interface of JDO)

 
api-jdo

javax.jdo.spi.PersistenceCapable.ObjectIdFieldConsumer

This interface is used to store fields from the Object id instance.(Interface of JDO)

 
manual

Chapter 2 - JPA Entity Classes

Explains how to define and use JPA entity classes and other JPA persistable types.... sections: JPA Persistable Types JPA Entity Fields JPA Primary Key Auto Generated Values Index ...

 
manual

Index Definition

Describes how to define indexes in JPA entity classes and explains how indexes are used in JPQL queries.... of maintenance time and storage space, so deciding which fields to define with indexes should be done carefully. This page covers ... Indexes can only be defined on ordinary persistent fields (not on primary key / version fields). Composite Index A ...

 
api-jdo

javax.jdo.spi.PersistenceCapable

A class that can be managed by a binary-compatible JDO implementation must implement this interface.(Interface of JDO)