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javax.persistence.criteria Interface Join<Z,X> Superinterfaces: Expression<X>, FetchParent<Z,X>, From<Z,X>, Path<X>, Selection<X>, TupleElement<X> Subinterfaces: CollectionJoin, ListJoin, MapJoin, PluralJoin, SetJoin A join to an entity, embeddable, or basic type. Since: JPA 2.0 Learn how to use


javax.persistence Annotation MappedSuperclass Target: Classes 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


javax.persistence.criteria Interface CriteriaBuilder.Coalesce<T> Superinterfaces: Expression<T>, Selection<T>, TupleElement<T> Interface used to build coalesce expressions. A coalesce expression is equivalent to a case expression that returns null if all its arguments evaluate to null


javax.persistence.criteria Interface CriteriaBuilder.Case<R> Superinterfaces: Expression<R>, Selection<R>, TupleElement<R> Interface used to build general case expressions. Case conditions are evaluated in the order in which they are specified. Since: JPA 2.0 Selection<X> alias(String name) Assigns


javax.persistence Annotation IdClass Target: Classes Specifies a composite primary key class that is mapped to multiple fields or properties of the entity. The names of the fields or properties in the primary key class and the primary key fields or properties of the entity must correspond


javax.persistence Annotation MapKeyJoinColumns Target: Fields (including property get methods) Supports composite map keys that reference entities. The MapKeyJoinColumns annotation groups MapKeyJoinColumn annotations. When the MapKeyJoinColumns annotation is used, both the name


javax.persistence.criteria Interface PluralJoin<Z,C,E> Superinterfaces: Expression<E>, FetchParent<Z,E>, From<Z,E>, Join<Z,E>, Path<E>, Selection<E>, TupleElement<E> Subinterfaces: CollectionJoin, ListJoin, MapJoin, SetJoin The PluralJoin interface defines functionality that is common to joins


javax.persistence Annotation MapKeyClass Target: Fields (including property get methods) Specifies the type of the map key for associations of type java.util.Map. The map key can be a basic type, an embeddable class, or an entity. If the map is specified using Java generics, the MapKeyClass


javax.persistence Interface EntityTransaction Interface used to control transactions on resource-local entity managers. The EntityManager.getTransaction() method returns the EntityTransaction interface. Since: JPA 1.0 Learn how to use EntityTransaction in Chapter 3 of the ObjectDB/JPA manual. void


Static Field javax.jdo.Constants String ANONYMOUS_PERSISTENCE_MANAGER_FACTORY_NAME The name of the anonymous PersistenceManagerFactory, which is the empty string. Since: JDO 2.1

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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