Fast Object Database for Java - with JPA/JDO support

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121	Locking in JPA supported pessimistic lock modes are: PESSIMISTIC_READ - which represents a shared lock. PESSIMISTIC_WRITE ... cannot be granted: A PESSIMISTIC_READ lock request fails if another user (which is represented by ... a PESSIMISTIC_READ lock on that database object. For example, consider the following code fragment: em1
65	PersistenceCapable.CHECK_READ Static Field javax.jdo.spi.PersistenceCapable byte CHECK_READ If jdoFieldFlags for a field includes CHECK_READ, then the field has been enhanced to call the jdoStateManager on read if the jdoFlags setting is not READ_OK or READ_WRITE_OK. Since: JDO 1.0
64	PersistenceCapable.MEDIATE_READ Static Field javax.jdo.spi.PersistenceCapable byte MEDIATE_READ If jdoFieldFlags for a field includes MEDIATE_READ, then the field has been enhanced to always call the jdoStateManager on all reads. Since: JDO 1.0
64	PersistenceCapable.READ_OK Static Field javax.jdo.spi.PersistenceCapable byte READ_OK If jdoFlags is set to READ_OK, then the fields in the default fetch group can be accessed for read without notifying the StateManager. Since: JDO 1.0
64	PersistenceCapable.READ_WRITE_OK Static Field javax.jdo.spi.PersistenceCapable byte READ_WRITE_OK If jdoFlags is set to READ_WRITE_OK, then the fields in the default fetch group can be accessed for read or write without notifying the StateManager. Since: JDO 1.0
63	Constants.PMF_ATTRIBUTE_NONTRANSACTIONAL_READ Static Field javax.jdo.Constants String PMF_ATTRIBUTE_NONTRANSACTIONAL_READ The name of the persistence manager factory element's "nontransactional-read" attribute. Since: JDO 2.1
63	Constants.PROPERTY_TRANSACTION_ISOLATION_LEVEL_READ_COMMITTED Static Field javax.jdo.Constants String PROPERTY_TRANSACTION_ISOLATION_LEVEL_READ_COMMITTED "javax.jdo.option.TransactionIsolationLevel.read-committed" Since: JDO 2.2 See Also: PersistenceManagerFactory.supportedOptions()
63	Constants.PROPERTY_TRANSACTION_ISOLATION_LEVEL_READ_UNCOMMITTED Static Field javax.jdo.Constants String PROPERTY_TRANSACTION_ISOLATION_LEVEL_READ_UNCOMMITTED "javax.jdo.option.TransactionIsolationLevel.read-uncommitted" Since: JDO 2.2 See Also: PersistenceManagerFactory.supportedOptions()
63	Constants.PROPERTY_TRANSACTION_ISOLATION_LEVEL_REPEATABLE_READ Static Field javax.jdo.Constants String PROPERTY_TRANSACTION_ISOLATION_LEVEL_REPEATABLE_READ "javax.jdo.option.TransactionIsolationLevel.repeatable-read" Since: JDO 2.2 See Also: PersistenceManagerFactory.supportedOptions()
63	Constants.TX_READ_COMMITTED Static Field javax.jdo.Constants String TX_READ_COMMITTED Transaction isolation level representing the requirement to read committed data only. Since: JDO 2.2 See Also: PersistenceManagerFactory.getTransactionIsolationLevel() Transaction.getIsolationLevel()

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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Copyright © 2003, 2010, 2020 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.