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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 Annotation ExcludeSuperclassListeners Target: Classes Specifies that the invocation of superclass listeners is to be excluded for the entity class (or mapped superclass) and its subclasses. Since: JPA 1.0 Learn how to define and use entity listeners in Chapter 3 of the ObjectDB


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 ListJoin<Z,E> Superinterfaces: Expression<E>, FetchParent<Z,E>, From<Z,E>, Join<Z,E>, Path<E>, PluralJoin<Z,List<E>,E>, Selection<E>, TupleElement<E> The ListJoin interface is the type of the result of joining to a collection over an association or element


javax.persistence Annotation Version Target: Fields (including property get methods) Specifies the version field or property of an entity class that serves as its optimistic lock value. The version is used to ensure integrity when performing the merge operation and for optimistic concurrency


Annotation Element javax.jdo.annotations.Persistent String mappedBy Name of the related member in the other class where this value is mapped (bidirectional relationship). Returns: the related member in the other class Default value: "" Since: JDO 2.1


Enum Constant javax.jdo.ObjectState PERSISTENT_NEW Since: JDO 1.0


Annotation Element javax.jdo.annotations.Persistent String loadFetchGroup Name of the fetch-group to use when this member is loaded due to being referenced when not already loaded. Returns: the name of the load fetch group Default value: "" Since: JDO 2.1


Enum Constant javax.jdo.ObjectState PERSISTENT_DIRTY Since: JDO 1.0


Annotation Element javax.jdo.annotations.Persistent Extension[] extensions Vendor extensions for this member. Returns: the vendor extensions Default value: {} 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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