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of the column referenced by this foreign key column. When used with entity relationship mappings ... with a unidirectional OneToMany foreign key mapping, the referenced column is in the table ... . When used in a CollectionTable mapping, the referenced column is in the table of the entity containing


.refresh(Object, java.util.Map) EntityManager.refresh(Object, LockModeType, java.util.Map) EntityManager.lock(Object, LockModeType) EntityManager.lock(Object, LockModeType, java.util.Map


javax.persistence Annotation AttributeOverrides Target: Classes and fields (including property get methods) Used to override mappings of multiple properties or fields. Example: @Embedded ... or property mapping overrides. (Required) One or more field or property mapping overrides. Since: JPA 1.0


Annotation Element javax.persistence.AttributeOverride Column column (Required) The column that is being mapped to the persistent attribute. The mapping type will remain the same as is defined in the embeddable class or mapped superclass. Since: JPA 1.0


Method javax.persistence.EntityManager Map<String,Object> getProperties() Get the properties and hints and associated values that are in effect for the entity manager. Changing the contents of the map does not change the configuration in effect. Returns: map of properties and hints in effect for entity manager Since: JPA 2.0


javax.persistence Annotation JoinColumns Target: Fields (including property get methods) Defines mapping for composite foreign keys. This annotation groups JoinColumn annotations for the same ... See Also: JoinColumn JoinColumn[] value The join columns that map the relationship. The join columns that map the relationship. Since: JPA 1.0


a ManyToOne or OneToOne relationship attribute that provides the mapping for an EmbeddedId primary key ... ; ... @MapsId("empid") // maps the empid attribute of embedded id @ManyToOne ... maps the entity’s primary key. Default value: "" Since: JPA 2.0


is embedded Default value: "" Since: JDO 2.1 Embedded[] embeddedMapping The embedded mapping for the element. The embedded mapping for the element. Returns: the embedded mapping for the element Default


Method javax.jdo.Query void setExtensions( Map extensions ) Set multiple extensions, or use null to clear all extensions. Map keys and values are not standard. An implementation must ignore entries that are not recognized. Parameters: extensions - the map of extensions Since: JDO 2.0 See Also: addExtension


-map" strategy. The value for the discriminator for objects of this class when using "value-map" strategy. Returns: The value for the discriminator for objects of this class when using "value-map" strategy 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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