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Fast Object Database for Java - with JPA/JDO support
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250

Database Schema Evolution

Modifications to entity classes that do not change their persistent field definitions (their schema ... schema, and old entity objects, which were stored previously in the old class schema, have to be converted to the new schema. Note: In client-server mode the ObjectDB server must be restarted
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Schema Update

The <schema> configuration element supports renaming packages, classes and fields in ObjectDB ... refactoring. Only these schema changes are specified in the configuration file. As explained in chapter 2, other schema changes are handled by ObjectDB automatically. Note: Extreme caution
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Table.schema

Annotation Element javax.persistence.Table String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0
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SecondaryTable.schema

Annotation Element javax.persistence.SecondaryTable String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0
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TableGenerator.schema

Annotation Element javax.persistence.TableGenerator String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0
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CollectionTable.schema

Annotation Element javax.persistence.CollectionTable String schema (Optional) The schema of the table. If not specified, the default schema for the user is used. Default value: "" Since: JPA 2.0
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JoinTable.schema

Annotation Element javax.persistence.JoinTable String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0
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Constants.PROPERTY_MAPPING_SCHEMA

Static Field javax.jdo.Constants String PROPERTY_MAPPING_SCHEMA Mapping "javax.jdo.mapping.Schema" Since: JDO 2.1
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SequenceGenerator.schema

Annotation Element javax.persistence.SequenceGenerator String schema (Optional) The schema of the sequence generator. Default value: "" Since: JPA 2.0
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PersistenceCapable.schema

Annotation Element javax.jdo.annotations.PersistenceCapable String schema Schema to use for persisting this class or interface. 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.

Need Help?

  1. Search ObjectDB website
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  5. Search or file an issue
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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, 2021  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.