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203

UPDATE SET Queries in JPA/JPQL

size of all the countries by 10%: UPDATE Country SET population = population * 11 / 10 UPDATE Country c SET c.population = c.population * 11 / 10 UPDATE Country AS c SET c.population = c.population ... variable name) for iteration. Multiple variables and JOIN are not supported. The SET clause defines one or
203

Entity Management Settings

The configuration element specifies front end settings that are relevant on the client ... specifies enhancement related settings: The agent attribute (whose value is "true" or "false ... ="weak" level2="0mb" /> The element specifies settings of the two cache mechanisms
203

Step 4: Create an ObjectDB Data Set

Queries against the database are represented in BIRT as data sets. To create the data set: Open the [New Data Set] dialog box by right clicking the Data Sets node in the [Data Explorer] window and selecting New Data Set. Select the data source that was created in the previous step (e.g. ObjectDB
202

Database Management Settings

The configuration element specifies back end (database engine) settings ... and page size settings: The initial attribute specifies an initial size of every new database file ... may corrupt the database. The element specifies the recovery file settings: The enabled
199

General Settings and Logging

The configuration element specifies ObjectDB settings that are relevant ... file settings: The path attribute specifies a directory in which the temporary files are generated ... ="8mb" stdout="false" stderr="false" /> General logging settings are specified in the element
188

Setting and Tuning of JPA Queries

The Query and TypedQuery interfaces define various setting and tuning methods that may affect query ... or at the level of a specific query, by overriding the default EntityManager setting: // Enable ... . JPA 2 adds support for pessimistic locking. The setLockMode method sets a lock mode
178

Step 6: Set the Spring XML

-file-list> The settings above routes web requests with .html suffix to the Spring dispatcher servlet. Additional spring configuration is set in another XML file (whose name is derived from ... /"/> The settings above guides Spring to support annotations (for components
178

Step 6: Set the Spring XML

The settings above routes web requests with .html suffix to the Spring dispatcher servlet. Additional spring configuration is set in another XML file ... /"/> The settings above guides Spring to support annotations (for components
170

JDO Annotations for Fetch Settings

All about JDO Annotations for Fetch Settings in Java/JPA database - explanations, examples, references, links and related information.
53

join(set, jt)

Method javax.persistence.criteria.From SetJoin join( SetAttribute set, JoinType jt ) Create a join to the specified Set-valued attribute using the given join type. Parameters: set - target of the join jt - join type Returns: the resulting join Since: JPA 2.0

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?

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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, 2022  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.