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javax.persistence.criteria.Subquery

upon the expression, returning a new expression object. Perform a typecast upon the expression, returning a new expression object. This method does not cause type conversion: the runtime type is not changed ... root Since: JPA 2.0 Join<X,Y> correlate( Join<X,Y> parentJoin) Create a subquery join object
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javax.jdo.JDOException

javax.jdo Exception JDOException java.lang.Object java.lang.Throwable java.lang ... and an optional failed object. Since: JDO 1.0 JDOException() Constructs a new JDOException ... (String msg, Object failed) Constructs a new JDOException with the specified detail message and failed
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javax.jdo.JDOObjectNotFoundException

javax.jdo Exception JDOObjectNotFoundException java.lang.Object java.lang.Throwable ... : Serializable This class represents exceptions caused by the user accessing an object that does not exist in ... (String msg, Object failed) Constructs a new JDOObjectNotFoundException with the specified
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javax.jdo.identity.IntIdentity

javax.jdo.identity Class IntIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... : arg0 - int compareTo(Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative ordering between the objects
0

javax.jdo.identity.StringIdentity

javax.jdo.identity Class StringIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... compareTo(Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative ordering between the objects Since: JDO 2
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javax.jdo.identity.ByteIdentity

javax.jdo.identity Class ByteIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... compareTo(T arg0) Parameters: arg0 - int compareTo(Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative
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javax.jdo.identity.ShortIdentity

javax.jdo.identity Class ShortIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... ) Parameters: arg0 - int compareTo(Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative ordering between
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javax.jdo.identity.LongIdentity

javax.jdo.identity Class LongIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... : arg0 - int compareTo(Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative ordering between
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javax.jdo.identity.CharIdentity

javax.jdo.identity Class CharIdentity java.lang.Object javax.jdo.identity.SingleFieldIdentity ... (Object o) Determine the ordering of identity objects. Determine the ordering of identity objects. Parameters: o - Other identity Returns: The relative ordering between the objects Since: JDO 2.2 boolean
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javax.jdo.JDOUserCallbackException

javax.jdo Exception JDOUserCallbackException java.lang.Object java.lang.Throwable java ... - the detail message. Since: JDO 1.0 JDOUserCallbackException(String msg, Object failed) Constructs a new JDOUserCallbackException with the specified detail message and failed object. Constructs

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, 2023  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.