About collection

forum_thread

2.4.7 Fetch

am noticing in 2.4.7 that 'fetch' cannot be added to objectdb.conf so, wondering how to enable 'eager' fetching of collections ?   Dave   #1 2013-03-29 23:13 am noticing in 2.4.7 that 'fetch' cannot be added to objectdb.conf so, wondering how to enable &# ...

 
forum_thread

Future JDO versions?

We are about to release our first product using ObjectDB (as a small embedded store), and soon hope to release a much larger product using ObjectDB (will need an OEM license).  What really interests us is JDO.  We have been using JDO for over a decade and have found it consistently a far better API than JPA, as all kinds of features that are optional or require special extensions in JPA products, (such as large query optimisation, storage of collections of non-entities and automated management of identity) are built-in to JDO. #1 2014-06-15 21:01 We are about to release our first product using ObjectDB (as a small embedded store), and soon hope to release a ...

 
forum_thread

Storing objects problem

I want to save this object to database: @Entity public class Device { private String name; private String type; private String ipAddress; private Device parent; @Id private String ID; private String ID_HZMO; @ElementCollection private List<Device> children; }    ... @ElementCollection annotation should not be used on a collection of entities, but this is probably not related to the problem that ...

 
api-jdo

javax.jdo.Extent

Instances of the Extent class represent the entire collection of instances in the data store of the candidate class or interface possibly including its subclasses or subinterfaces.(Interface of JDO)

 
forum_thread

Performance issues on aggregate query

we are using this aggregate query to collect some data: #1 2016-11-09 07:49 we are using this aggregate query to collect some data: select p3.doubleValue,c1.classIdentifier,c1.objec ...

 
forum_thread

ObjectDB version 2.3 has been released

ObjectDB 2.3 has been released and it includes important additions and fixes: #1 2011-09-21 13:36 ObjectDB 2.3 has been released and it includes important additions and fixes: Added the abilit ...

 
api-jpa

javax.persistence.Temporal

This annotation must be specified for persistent fields or properties of type java.util.Date and java.util.Calendar.(Annotation of JPA)

 
api-jdo

javax.jdo.annotations.Element

Annotation for the element of a collection/array relation.(Annotation of JDO)

 
api-jpa

javax.persistence.MapKeyTemporal

This annotation must be specified for persistent map keys of type java.util.Date and java.util.Calendar.(Annotation of JPA)

 
api-jdo

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameter)

Add a subquery to this query.(Method of javax.jdo.Query)