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Manual
3

General Settings and Logging

data, such as query results that contain millions of objects. The element specifies temporary ... . The $temp prefix can be used to represent the system default temporary path, as demonstrated ... sockets become obsolete as a result of inactivity. The value is the timeout in seconds, where 0
Manual
3

Setting and Tuning of JPA Queries

simple JPA operations, such as find. However, query execution is much more complex ... the application, either at the EntityManager level as a default for all the queries in that EntityManager ... . "objectdb.query-language" - sets the query language, as one of "JPQL" (JPA query language), "JDOQL
Manual
3

Shared (L2) Entity Cache

that it manages. The persistence context serves as a first level cache. An attempt to retrieve ... classes except classes that are specified as Cacheable explicitly. For example: @Cacheable // or ... that are specified as non Cacheable explicitly. For example: @Cacheable(false) @Entity public class
Manual
3

Updating JPA Entity Objects

yet are also persisted. Automatic Change Tracking As shown above, an update is achieved by modifying a managed ... automatically JDOHelper.makeDirty(employee, "projects"); // reported as dirty em.getTransaction().commit(); As demonstrated above, array changes are not detected automatically (by default
FAQ
3

What is the Java Persistence API (JPA)?

) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC ... programming. A JPA implementation (sometimes referred to as a JPA provider) is needed in order to interact with a relational database such as Oracle, DB2, SQL Server or MySQL. The popular JPA
Manual
3

Working with JPA Entity Objects

at it is that the persistence context also functions as a local cache for a given EntityManager. ObjectDB also manages a level 2 shared cache for the EntityManagerFactory as well as other caches as explained in ... ); The persistence context can be cleared by using the clear method, as so: em.clear
Manual
3

Obtaining a JPA Database Connection

"); The createEntityManagerFactory static method expects a persistence unit name as an argument ... itself (that is the job of the factory as previously explained). Once the EntityManager object is closed ... resources (such as a database file pointer or a socket to a remote server) in a connection pool and use
Manual
3

Database Replication and Clustering

embedded mode) can function as a master database in a cluster. Recording has to be enabled ... > The url attribute of the element defines a master database. As demonstrated ... , the master database can be accessed ordinarily as follows: EntityManagerFactory emf = Persistence
Result
3

Privacy Policy

for websites to obtain explicit consent from users before leaving behind or reading files such as cookies ... and stored securely until a time it is no longer required or has no use, as detailed in the Data ... on are custom to the terms and conditions as well as the privacy policies held with each social media
JPA Doc
2

Criteria Query Selection and Results

clauses and for representing query results as tuples. SELECT Clause Elements The content of the SELECT ... of Expression, any criteria expression can be used as the SELECT clause content. Multiple selection ... . Query Results as Tuples JPA 2 introduces a new way to represent multi selection results (i.e. results