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Working with JPA Entity Objects

>Entity objects retrieved from the database by an EntityManager are also in the A managed entity object can also be retrieved from the database and marked for deletion ... . The entity object changes its state from Managed to Removed, and is physically deleted

JPA Primary Key

that is absent from other object oriented databases. Entity ... (and can be retrieved from the database) by the combination of its type ... are deleted from the database. The primary key value of an entity can be accessed by

Apache License, Version 2.0, January 2004

resulting from mechanical transformation or translation of a Source form, including but not limited ... Object form, that is based on (or derived from) the Work and for which the editorial revisions ... from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.

JPA / JDO Class Enhancer

. It is contained in the objectdb.jar file. You can run it from the command line as ... > on Windows and on Unix/Linux) from the ObjectDB bin directory ... from Java code: com.objectdb.Enhancer.enhance("test.pc.*,test.X

JPA Named Queries

the JPQL query strings from the Java code. It also enforces the use of query ="Country.findAll", query="SELECT c FROM Country c ... ">query="SELECT c FROM Country c") public class Country { ... } Attaching multiple

JPA Lifecycle Events

has been retrieved from the database. @PreUpdate@PostRemove - after deleting an entity from ... class and all its descendant classes from using the default listeners:

Database Explorer

> file. You can run it from the command line as follows: > ... entity objects can be accessed from the [Database] tabbed window. Editing Database Content ... a viewer window deletes the object itself from the database. Editing Collections

Database Management Settings

during a write to the database, the recovery file can be used to fix the database. Recovery from ... .Activator from the command line. Every machine requires a specific activation ... license) are signed and excluded from evaluation restrictions. Therefore, when ObjectDB runtime


> instances. All PersistenceManager instances obtained from the same ... > Once the first PersistenceManager is obtained from the If the authorization check succeeds, check to see that all PersistenceManager instances obtained from


class="teaser"> Fetch one field from the field manager. Fetch one field from the field manager. This field will be stored ... ;fieldNumber) Fetch one field from the field manager.