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FAQ
302

Is ObjectDB better than Object Relational Mapping (ORM)?

As noted above, using ObjectDB instead of a relational database and ORM combination is easier and leads to better performance. ORM tools, however, are very useful where the use of a relational ... for an existing old relational database). By using the Java Persistence API (JPA), you can develop
FAQ
295

Can I use ObjectDB to access a relational database?

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured
JDO Doc
72

Constants.OPTION_MAPPING_RELATION_SUBCLASS_TABLE

Static Field javax.jdo.Constants String OPTION_MAPPING_ RELATION_SUBCLASS_TABLE "javax.jdo.option.mapping.RelationSubclassTable" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
Manual
49

Comparison in JPQL and Criteria API

Explains how comparison operators can be used in JPQL queries, including in comparing null values.
Forum
25

Object Relations Error after Schema Change

Hi we have a problem with relations in OBjectDB 2.4.6, the problem occured after we changed relations in few clases. Specificaly we deleted relation pointing to one class and created new relation ... the class we have changed the relation. Quote from the log “08:44:09,440 ERROR [stderr] (http--10.10
Forum
24

Entity is not related to ObjectDB, but i get exception from ObjectDB

, it is an exception from ObjectDB, although the entity itself is not related to ObjectDB any
Forum
24

how to query by properties of onetomany relations? (Error 990)

in my test database i have one Foo entity with one Bar relation   thanks in advanced Sorry
Forum
24

ObjectDB Explorer don't show ManyToOne relations

Hello support. we have a problem with the ObjectDB Explorer and @ManyToOne relations. We persist the entity FolderImpl that has an attribute of type ModelElement. If we use an interface for the attribute then the ObjectDB Explorer shows NULL for the attribute although our unit test checks
Forum
23

Error: Failed to write value of field X using reflection (oneToMany relation)

Error: Failed to write value of field X using reflection (oneToMany relation)
Result
20

Eclipse Public License - v 1.0

. The obligations in this section do not apply to any claims or Losses relating to any actual or alleged ... to control, and cooperate with the Commercial Contributor in, the defense and any related settlement ... , or offers warranties related to Product X, those performance claims and warranties