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Type.PersistenceType.MAPPED_SUPERCLASS

Enum Constant javax.persistence.metamodel.Type.PersistenceType MAPPED_SUPERCLASS Mapped superclass Since: JPA 2.0
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JPA Persistence Unit

, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit ... .Provider</provider> <mapping-file>META-INF/mappingFile.xml</mapping-file> <jar-file ... . If not specified, the first JPA implementation that is found is used. The mapping-file elements
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JPA Entity Fields

Fields of persistable user defined classes (entity classes, embeddable classes and mapped ... (Mapped By) fields Primary key (ID) fields Version field The first three groups (transient, persistent ... : OneToOne, ManyToOne - for references of entity types. OneToMany, ManyToMany - for collections and maps
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Can I use ObjectDB to access a relational database?

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured
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Collections in JPQL and Criteria Queries

Shows how collections and maps can be used in JPQL queries.
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Constants.OPTION_MAPPING_JOINED_TABLE_PER_CONCRETE_CLASS

Static Field javax.jdo.Constants String OPTION_MAPPING_JOINED_TABLE_PER_CONCRETE_CLASS "javax.jdo.option.mapping.JoinedTablePerConcreteClass" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
5

Constants.OPTION_MAPPING_JOINED_TABLE_PER_CLASS

Static Field javax.jdo.Constants String OPTION_MAPPING_JOINED_TABLE_PER_CLASS "javax.jdo.option.mapping.JoinedTablePerClass" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
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Constants.OPTION_MAPPING_HETEROGENEOUS_OBJECT_TYPE

Static Field javax.jdo.Constants String OPTION_MAPPING_HETEROGENEOUS_OBJECT_TYPE "javax.jdo.option.mapping.HeterogeneousObjectType" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
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Constants.OPTION_MAPPING_HETEROGENEOUS_INTERFACE_TYPE

Static Field javax.jdo.Constants String OPTION_MAPPING_HETEROGENEOUS_INTERFACE_TYPE "javax.jdo.option.mapping.HeterogeneousInterfaceType" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
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DiscriminatorStrategy.VALUE_MAP

Enum Constant javax.jdo.annotations.DiscriminatorStrategy VALUE_MAP 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.

Need Help?

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