About Object Database

121-130 of 200Refresh
Forum
17

Attempt to refresh a non managed entity object (error 635)

.IllegalArgumentException Attempt to refresh a non managed entity object (error 635) Nothing changed in my code ... with Intellij's JPA database explorer, which required me to use a JPA persistence.xml configuration file ... entity object, i.e. a new entity object that has not been persisted yet, or a detached entity object (e
Forum
17

how to persist an object twice into two diff. collections of two diff. classes

ok my problem,    i persist a Squad Object into a Cup Object at the beginning, after i have to create and persist a competition object in which i have to put some of the already created/persisted ... .java:259) at ch.hsr.gymtastic.technicalServices.database.DBConnection.commit(DBConnection.java:46
Forum
17

Is it ok to put list or map of embeddable objects in entity ?

Hi, Is it ok to put list or map of embeddable objects in entity? I mean, for example : @Entity ... >()) on an entity that had some Class_B instances in bList? Will they be deleted correctly from database ... X not found". I found an option to put a classpath for persistence objects and metadata, where I
Forum
17

First query before any of the object has been stored

I have some code that, before writing an object via ObjectDB makes a query to ensure the new object is different from what's already stored.  The problem is that, before any instances of that object ... some other persistence related exception.  How can I know if any of an object has been stored
Issue
17

Database File Compression

ObjectDB database files are usually smaller than database files of other Database Management Systems (object databases and relational databases) but additional internal compression is still possible ... . So the effect of using compressed ObjectDB database file on performance is unknown yet.
Forum
17

Performance with large databases

a larger database. Is fetching an object by the id faster than fetching by an indexed field, or ... When populating a large database (10s of GBs) performance drops suddenly at a certain time whenever I run the populating application.  Is there typically a database size when indexes can no longer
Forum
17

Using the wrong class to access a database

the Point database described in the Getting Started section: package com.objectdb.tutorial ... if I can access the database from here. This program is almost the same as the first; it only calls ... are working fine, but the third ruins the database: - The number of entries is zero. - running the app
Forum
17

Object Relations Error after Schema Change

, until a user that still has the old version of the class accesses the database. Please verify ... database to another ObjectDB database, we think starting with a new DB would help resolve ... . Could you please check the database with the ObjectDB Doctor and post the output? In addition, you can try migrating
Manual
17

Running JPA Queries

(with getResultList) The following query retrieves all the Country objects in the database. Because multiple ... object reflecting the number of Country objects in the database: TypedQuery query = em ... on the database content. For example, the following query is expected to return a single Country object
Manual
17

Running JPA Queries [2011-09-21]

(with getResultList) The following query retrieves all the Country objects in the database. Because multiple ... object reflecting the number of Country objects in the database: TypedQuery query = em ... on the database content. For example, the following query is expected to return a single Country object