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23

Index Definition

which fields to define with indexes should be done carefully. Single Field Index JPA does not define ... ; // unique } @Unique represents a unique index that prevents duplicate values in the indexed field ... a unique field (similar to how primary keys behave). @Index represents either an ordinary index
22

Retrieving JPA Entity Objects

key but all its other persistent fields are uninitialized. The object content is retrieved from the database and the persistent fields are initialized, lazily, when the entity object is first accessed ... through all the non collection and map persistent fields (i.e. through one-to-one and many-to-one relationships
22

Database Explorer

the database and their persistent fields and indexes. The [Query] window enables running JPQL ... , every column represents a persistent field, and the content of a cell is the value of a single field in ... and the values of its persistent fields are represented as child nodes. Tree windows provide easier
2

Constants.PMF_ATTRIBUTE_OPTIMISTIC

Static Field javax.jdo.Constants String PMF_ATTRIBUTE_OPTIMISTIC The name of the persistence manager factory element's "optimistic" attribute. Since: JDO 2.1
2

Constants.PMF_ATTRIBUTE_NONTRANSACTIONAL_WRITE

Static Field javax.jdo.Constants String PMF_ATTRIBUTE_NONTRANSACTIONAL_WRITE The name of the persistence manager factory element's "nontransactional-write" attribute. Since: JDO 2.1
2

InstanceLifecycleEvent.STORE

Static Field javax.jdo.listener.InstanceLifecycleEvent int STORE Since: JDO 2.0
2

InstanceLifecycleEvent.LOAD

Static Field javax.jdo.listener.InstanceLifecycleEvent int LOAD Since: JDO 2.0
2

InstanceLifecycleEvent.DIRTY

Static Field javax.jdo.listener.InstanceLifecycleEvent int DIRTY Since: JDO 2.0
2

InstanceLifecycleEvent.DETACH

Static Field javax.jdo.listener.InstanceLifecycleEvent int DETACH Since: JDO 2.0
2

[ODB1] Chapter 9 - ObjectDB Explorer

the list of classes at the top of this window and see all its persistent fields ... a persistent field, and the content of a cell is the value of a single field in a single database object ... , and the values of its persistent fields are represents by child nodes. The main advantage of using

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.