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/entity/types#embeddable_classes">embeddable classes and mapped_superclasses">mapped superclasses), and is usually optional. There is one case ... collection and map fields can be loaded lazily (by using proxy objects), but persistent fields

conversions between graphs of Java objects and flat database table rows. Object Relational Mapping (ORM ... is an extremely easy to use pure Java Object Database, which supports JPA with no mappingmapping - start writing more effective database code using Java classes and objects!

Mapping (ORM) JPA providers (for mapping between a relational database and an object model and for direct SQL queries): Mapping

>PluralJoin<Z,Map<K,V>,V> , java.util.Mapmap entry. Create

) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table, join table, or table of the target entity that is used to represent the map. If no MapKeyJoinColumn

"> Instances of the type MappedSuperclassType represent mapped superclass types ... declared by the entity or mapped superclass. mapped superclass.

represent entity or mapped superclass types. mapped superclass ... that corresponds to the id attribute declared by the entity or mapped superclass.

"> Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass ... the attribute that corresponds to the id attribute declared by the entity or mapped superclass. (String name) Return the Map

) Specifies the mapping for the key column of a map whose map key is a basic type. If the name element is not ... ="IMAGE_NAME") @Column(name="IMAGE_FILENAME") @CollectionTable(name="IMAGE_MAPPING

implementation. Most other JDO implementations map classes and objects to tables and records in an RDBMS. Using such mapping makes it possible to write clean Java code, but still requires some familiarity ... the necessary mappings and maintain them throughout the life of a system. With ObjectDB