About JPA

issue

JPQL support for Maps (JPA 2.0)

JPQL 2.0 introduces the ability define FROM variables for map keys and values. Currently ObjectDB supports FROM variables for collection elements and FROM variables for map keys and values are expected to be supported in future versions. JPA Feature Version: 2.0.0 Priority: Normal Status: Active ... Type:  JPA Feature ... Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
forum_thread

JDO @Index in JPA?

Hi! I have a project which has all entities as JPA entities. I would like to make use of indexing, which I know that it's not available in JPA, but ObjectDB works with JDO as well. Question1: will adding JDO @Index in a JPA entity have any effect or I have to switch that entity to JDO? Question2: switching entities from JPA to JDO can happen when there is already data in the database? Or do I have to delete the previous data and start with a fresh db? Thank you. ... Hi! I have a project which has all entities as JPA entities. I would like to make use of indexing, which I know that it's not available in JPA, but ObjectDB works with JDO as well. Question1: will adding JDO ...

 
issue

JPQL Subqueries (JPA 1.0)

The JPQL (Java Persistence Query Language) supports defining subqueries, which are nested queries that are embedded in other queries. Subqueries are currently not supported by ObjectDB, and as a workaround, you can use a sequence of two or more queries, where the results of one query serves as a parameter in the next queries. JPA Feature Version: Priority: Low Status: Active ... Type:  JPA Feature ... Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
manual

JPA / JDO Class Enhancer

The Enhancer is a post compilation tool that improves performance by modifying the byte code of compiled classes after compilation.... enhanced. It is a good practice (and actually required by JPA but not enforced by ObjectDB) to avoid accessing persistent fields of other ... (e.g. @Entity javax.persistence.Entity JPA annotation Specifies that the class is an entity. See JavaDoc ...

 
api-jpa

javax.persistence.CascadeType

Defines the set of cascadable operations that are propagated to the associated entity.(Enum of JPA)

 
forum_thread

Web Framework Recommendation for leveraging JPA + ObjectDB

Hello dear ObjectDB Community ! First of all let me tell You: I am glad that I have revisited ObjectDB just recently; because with its newly added JPA compliance and affordability, it seems like a natural match to me. I have the following understanding: If I persist standardly against JPA/JDO, I can switch Persistence Engines as I see fit later on ! So that I can easily switch to a true OODBMS like ObjectDB, for instance. ... ObjectDB just recently; because with its newly added JPA compliance and affordability, it seems like a natural match to me. ... following understanding: If I persist standardly against JPA/JDO, I can switch Persistence Engines as I see fit later on ! So that I can ...

 
forum_thread

JDO support vs JPA

Hi, I am about to update the JDO metadata in the package.jdo files after moving from ObjectDB 1 to 2. However I found that there is no complete description or guide how the XML metadata should look in version 2. I found only small fragments of attributes in the description of JDO Annotations (to which XML element is the given annotation equivalent). So my questions to this are: 1. Is there some description of XML metadata for ObjectDB ver2 using JDO which I did not find? ... documentation for JDO and no manual at all as there is for JPA. Does this mean that the support of JDO in ObjectDB 2 is already in some legacy mode ? So is JPA the preferred technology above JDO ? 4. If I would decide to move ...

 
forum_thread

New Tutorial: Using BIRT with ObjectDB/JPA

Version 2.2.7 of ObjectDB added support of report generation using the popular open source Business Intelligence and Reporting Tools (BIRT). The new Report Generation with BIRT and JPA tutorial provides step by step instructions on how to use BIRT to produce reports based on data in an ObjectDB database. ... The new  Report Generation with BIRT and JPA  tutorial provides step by step instructions on how to use BIRT to ... Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
forum_thread

Can you implement fastest Native JPA for MySQL by ClusterJ like?

Hello , I've read some docs : http://biemond.blogspot.com/2010/04/super-fast-jpa-with-mysql-cluster-and.html http://dev.mysql.com/doc/ndbapi/en/mccj-using-jpa.html   ... docs : http://biemond.blogspot.com/2010/04/super-fast-jpa-with-mysql-cluster-and.html http://dev.mysql.com/doc/ndbapi/en/mccj-using-jpa.html ... These documents telling us they did native JPA implementations for MySQL without JDBC Layer. I'm trying to use ...

 
forum_thread

Benchmark native JPA of Versant database (without datanucleous)

Now Versant DB (db4o commercial) has JPA implementation    Can you benchmark this Object Oriented DB to compare with Object DB? ... Now Versant DB (db4o commercial) has JPA implementation    Can you benchmark this Object Oriented ... is open source, so you can also run it yourself with any JPA implementation that you are interested in. ...