About join

issue

Compare two schemas or odb files

For example, if we make a backup of our database it would be helpful to have the possibility to compare the backup schema (odb file) with the current version in the database and as result we should get the difference between the two schemas. It would also be sufficient, if we can compare object graphs stored in the db with old graphs from backup db. Feature Request Version: Priority: Normal Status: Active Replies: 0 Type:  Feature Request ...

 
forum_thread

adding tutorial videos to youtube

Hello , it will be good for you to add video tutorials for objectdb and explorer on youtube. #1 2013-02-02 22:45 Hello , it will be good for you to add video tutorials for objectdb and explorer on youtube. ...

 
api-jpa

JoinType.INNER

Inner join.(Enum Constant of javax.persistence.criteria.JoinType)

 
issue

New Java 8 (JDK 1.8) Collection Methods

ObjectDB version 2.5.5 (and above) supports Java 8 (JDK 1.8). Tracking changes to collections and maps using some new Java 8 methods is currently not fully supported. The main known issue is that orphan removal does not happen as a result of removing a reference to an object (which becomes an orphan) using the new methods: removeIf(predicate) and remove(key, value). Feature Request Version: 2.5.5 Priority: Normal Status: Active Replies: 0 Type:  Feature Request ...

 
forum_thread

New Tutorial: Using BIRT with ObjectDB/JPA

Version 2.2.7 of ObjectDB added support of report generation using the popular open source Business Intelligence and Reporting Tools (BIRT). The new Report Generation with BIRT and JPA tutorial provides step by step instructions on how to use BIRT to produce reports based on data in an ObjectDB database. #1 2011-06-16 20:04 Version 2.2.7 of ObjectDB added support of report generation using the popular open source Business Intellig ...

 
forum_thread

Using your own classes in the entity class?

When I use other objects from other self-made classes in the JPA Entity Class I get the following error code: #1 2016-02-08 14:48 This post is solved edit delete ...

 
api-jpa

JoinTable.joinColumns

(Optional) The foreign key columns of the join table which reference the primary table of the entity owning the association.(Annotation Element of javax.persistence.JoinTable)

 
manual

[ODB1] Chapter 7 - JDOQL Queries

Explains how to use JDOQL, the Java/JDO Query Language.... Unbound variables, which serve as a replacement for the JOIN operation of SQL Support of bound variables is mandatory, but ... by JDO. Queries with unbound variables are similar to JOIN queries in SQL because every combination of variables has to be checked ...

 
forum_thread

Error 613 - i cant put a list<Athlete> into a Squad object

hey guys Im a swiss student and my english is not that good and ive never posted in your forum, so thats why im sorry if im doing any mistakes, but i have big trouble, because ive to get this straight till end of week. i uploaded also all classes but if u see the problem in the main problem field the classes are copied after the problem description. the structure: #1 2011-04-04 17:38 hey guys Im a swiss student and my english is not that good and ive never posted in your forum, so thats ...

 
issue

Automatic Switch to Replicated Server Limitations

ObjectDB supports master-slave replication, with the ability to switch connections automatically when one server goes down to another server, by specifying a composite url. Currently this feature has the following limitations: Feature Request Version: 2.5.0 Priority: Normal Status: Active Replies: 0 Type:  Feature Request ...