About JOIN

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 Replies: 0 Type:  JPA Feature ...

 
issue

Abiity to save queries in Explorer

Feature Request Version: 2.6.9 Priority: Normal Status: Active Replies: 0 Type:  Feature Request ...

 
api-jpa

getModel()

Return the metamodel representation for the list attribute.(Method of javax.persistence.criteria.ListJoin)

 
forum_thread

ObjectDB version 2.2 has been released

ObjectDB 2.2 has been released and it includes important additions and fixes: #1 2011-04-03 09:11 ObjectDB 2.2 has been released and it includes important additions and fixes: Added full support o ...

 
forum_thread

ObjectDB version 2.1 has been released

Version 2.1 has been released: #1 2011-02-25 06:25 ObjectDB 2.1 has been released and it includes important additions and fixes: Added Online Backu ...

 
api-jdo

Key.serialized

Whether the key is to be stored serialized (into a single column of a join table).(Annotation Element of javax.jdo.annotations.Key)

 
api-jpa

JoinColumn.unique

(Optional) Whether the property is a unique key.(Annotation Element of javax.persistence.JoinColumn)

 
forum_thread

How to avoid NULL values on Embedded entities

Hi there. I'm new on this. trying to learn. I'm trying to make a value non nulleable. So, when I try to upload to the DB this field as null, it give me an error. I tried this, but it didn't work: #1 2017-02-24 02:24 Hi there. I'm new on this. trying to learn. I'm trying to make a value non nulleable. So, when I ...

 
api-jpa

JoinTable.inverseJoinColumns

(Optional) The foreign key columns of the join table which reference the primary table of the entity that does not own the association.(Annotation Element of javax.persistence.JoinTable)

 
api-jpa

javax.persistence.DiscriminatorColumn

Specifies the discriminator column for the SINGLE_TABLE and JOINED Inheritance mapping strategies.(Annotation of JPA)