About join

forum_thread

Database is locked when in use

I am oberving that when i reading anything from odbfiles, i am not allowed to copy and paste the odb files in the file system but the same i was able to do it in object db 1.0. We supprt export functionality and if i am not allowed to copy it in objectdb 2.x, then its a problem for us :-( Do you have any settings or other way to handle this? #1 2012-09-07 18:35 I am oberving that when i reading anything from odbfiles, i am not allowed to copy and paste the odb files in the ...

 
forum_thread

zip file or JAR manifest missing

I found the message: Error opening zip file or JAR manifest missing: /E:/projects/ObjectDB/bin/objectdb.jar Some of projects can read the DB, but others can not read or write the DB. #1 2011-06-28 15:38 I found the message: Error opening zip file or JAR manifest missing : / E :/ projects / Obje ...

 
issue

Unexpected exception (Error 990) on find

I have a huge amount of inserts/updates and after a about 850.000 Entities I got the following error: Bug Version: 1.04 Priority: Normal Status: Fixed Replies: 16 Type:  Bug ...

 
forum_thread

EntityManager JPA or JDO impl and different behavior

Hi, I have an issue with the EntityManager. My persistance XML looks like: <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> #1 2011-12-02 02:24 Hi, I have an issue with the EntityManager. My persistance XML looks like: <?xml version = ...

 
release

2.6.4

... (no access during backup operation). Fixed JOIN FETCH bugs. Fixed a performance issue with mapped by fetch. ... in Mac OS. Fixed a bug in using FETCH JOIN in criteria queries. Fixed a bug in cascading remove when ...

 
issue

[ObjectDB 2.5.5_03] Unexpected exception (Error 990)

Hello! When I run this query SELECT t FROM Unit t WHERE t.lastGeocodedPosition IS NULL OR t.lastGeocodedPosition.receiveTime < :lastGeocodedPosition.receiveTime I get the following exception: ... to: SELECT t FROM Unit t INNER JOIN t . lastGeocodedPosition l WHERE l IS NULL OR l . ... SELECT t FROM Unit t LEFT OUTER JOIN t . lastGeocodedPosition l WHERE l . receiveTime < :last ...

 
api-jpa

javax.persistence.AssociationOverride

Used to override a mapping for an entity relationship.(Annotation of JPA)

 
forum_thread

JPA vs JDO - which is more efficient for OneToMany queries?

I'm curious about the trade offs between JDO and JPA. Seems to me that JDO will perform better and be statically typed. For example: Assume there are Customers and Orders.... efficient to use non collection references, to avoid a JOIN table (so a reference from Order to Customer in the above example ... less efficient in ORM-based implementation and requires a JOIN table and a query for navigation, is implemented differently in ObjectDB, ...

 
release

2.5.5

... and maps of invalid types. Changed JOIN FETCH to act as LEFT JOIN in path expressions. Updated the PDF manual. ...

 
forum_thread

Missing Data on Retrieval (0, null values)

I try  to export all Objects in an Flatfile-Hiearchy (.csv). But only the first exported Table contains all necessary Data. Most of the others  contains all  Object-Rows', but most Values of the Columns are missing. With a  em.clear() inside the Loop, all tables are exported correctly but the Enity-Keys do not match. I can't get the point - what am i doing wrong?   emf = Persistence.createEntityManagerFactory(dbFile); em = emf.createEntityManager(); #1 2016-04-13 07:07 I try  to export all Objects in an Flatfile-Hiearchy (.csv). But only the first exported Table contains ...