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81

Retrieving JPA Entity Objects

. JPA queries and JPQL are described in chapter 4. Retrieval by Refresh Managed objects can be reloaded from the database by using the refresh method: em.refresh(employee); The content ... since it was retrieved. An IllegalArgumentException is thrown by refresh if the argument is not
74

refresh(pc)

Methodjavax.jdo.PersistenceManager void refresh( Object pc ) Refresh the state of the instance from the data store. In an optimistic transaction, the state of instances in the cache might not match ... will refresh nontransactional state. Parameters: pc - the instance to refresh. Since: JDO 1.0
74

refresh(pc)

Method javax.jdo.PersistenceManager void refresh( Object pc ) Refresh the state of the instance from the data store. In an optimistic transaction, the state of instances in the cache might not match ... will refresh nontransactional state. Parameters: pc - the instance to refresh. Since: JDO 1.0
72

refresh(entity, lockMode, properties)

Method javax.persistence.EntityManager void refresh( Object entity, LockModeType lockMode, Map properties ) Refresh the state of the instance from the database, overwriting changes made to the entity, if any, and lock it with respect to given lock mode type and with specified
72

refresh(entity, properties)

Method javax.persistence.EntityManager void refresh( Object entity, Map properties ) Refresh the state of the instance from the database, using the specified properties, and overwriting changes made to the entity, if any. If a vendor-specific property or hint is not recognized
72

CascadeType.REFRESH

Enum Constant javax.persistence.CascadeType REFRESH Cascade refresh operation Since: JPA 1.0
72

refresh(entity, lockMode)

Method javax.persistence.EntityManager void refresh( Object entity, LockModeType lockMode ) Refresh the state of the instance from the database, overwriting changes made to the entity, if any, and lock it with respect to given lock mode type. If the lock mode type is pessimistic and the entity
72

refresh(entity)

Method javax.persistence.EntityManager void refresh( Object entity ) Refresh the state of the instance from the database, overwriting changes made to the entity, if any. Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or the entity is not
72

CacheStoreMode.REFRESH

Enum Constant javax.persistence.CacheStoreMode REFRESH Insert/update entity data into cache when read from database and when committed into database. Forces refresh of cache for items read from database. Since: JPA 2.0
56

Locking in JPA

employee = em.find( Employee.class, 1, LockModeType.PESSIMISTIC_WRITE); Similarly, the refresh method can also receive a lock mode: em.refresh(employee, LockModeType.PESSIMISTIC_WRITE ... , properties); ... em.refresh(employee, LockModeType.PESSIMISTIC_WRITE, properties); Setting

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, 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.