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Persistent.serialized

Annotation Element javax.jdo.annotations.Persistent String serialized Whether this member is serialized into a single column. Returns: whether this member is serialized into a single column Default value: "" Since: JDO 2.1
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Persistent.nullValue

Annotation Element javax.jdo.annotations.Persistent NullValue nullValue Behavior when this member contains a null value. Returns: the behavior when this member contains a null value Default value: javax.jdo.annotations.NullValue.NONE Since: JDO 2.1
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Persistent.embeddedValue

Annotation Element javax.jdo.annotations.Persistent String embeddedValue Whether the values of this member are embedded. Returns: whether the values of this member are embedded Default value: "" Since: JDO 2.1
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Persistent.mappedBy

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
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Persistent.embedded

Annotation Element javax.jdo.annotations.Persistent String embedded Whether this member is embedded. Returns: whether this member is embedded Default value: "" Since: JDO 2.1
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Persistent.dependentValue

Annotation Element javax.jdo.annotations.Persistent String dependentValue Whether the values of this member are dependent. Returns: whether the values of this member are dependent Default value: "" Since: JDO 2.1
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Persistent.embeddedKey

Annotation Element javax.jdo.annotations.Persistent String embeddedKey Whether the keys of this member are embedded. Returns: whether the keys of this member are embedded Default value: "" Since: JDO 2.1
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Persistent.embeddedElement

Annotation Element javax.jdo.annotations.Persistent String embeddedElement Whether the elements of this member are embedded. Returns: whether the elements of this member are embedded Default value: "" Since: JDO 2.1
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Persistent.dependent

Annotation Element javax.jdo.annotations.Persistent String dependent Whether related object(s) of this member are dependent and so deleted when this object is deleted. Returns: whether the related object(s) of this member are dependent Default value: "" Since: JDO 2.1
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Persistent.defaultFetchGroup

Annotation Element javax.jdo.annotations.Persistent String defaultFetchGroup Whether this member is in the default fetch group. Returns: whether this member is in the default fetch group 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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Which JPA is Faster?

 

See a comparison of Hibernate, EclipseLink, OpenJPA, DataNucleus, MySQL, PostgreSQL, Derby, HSQLDB, DB4O by Versant, H2 Database, SQLite and ObjectDB

in the JPA Benchmark.

Copyright © 2003, 2010, 2024  ObjectDB Software, all rights reserved. The JPA API Reference Documentation (JavaDoc) on this website is derived with some adjustments from the open source JPA 2 RI (EclipseLink) and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0. The JDO API Reference Documentation (JavaDoc) on this website is derived with some adjustments from the JDO 2.2 API and is available under the terms of the Apache License, v. 2.0. Images on this website are available under these licecnes. Documentation on this website explains how to use JPA in the context of the ObjectDB Object Database but mostly relevant also for ORM JPA implementations, such as Hibernate (and HQL), EclipseLink, TopLink, OpenJPA and DataNucleus. ObjectDB is not an ORM JPA implementation but an Object Database (ODBMS) for Java with built in JPA 2 support.