About relation

forum_thread

Opensource ObjectDB

I know you have answered this question some years ago, but I think about the databases that have recently "triumphed" like MySQL, MongoDB or SQLite and they are free databases. Also in the Java world we have the example of Hibernate (ORM) and Apache Hadoop (framework for Big Data). #1 2014-05-13 16:47 I know you have answered this question some years ago, but I think about the databases that have recently "triump ...

 
issue

again merger missing logs + objectdb exception

we are facing similar problems as we had before, in the log we have a lot of entries merger ... missing + an objectdb exception. Some objects in the system behave strange. This is a part of the log: ... [2017-09-26 12:16:14 #1222 store] SectionClassifier: SectionClassifier{238146996->merger[3309]-missing:1} [2017-09-26 12:16:25 #1223 store] SectionClassifier: SectionClassifier{238146996->merger[3309]-missing:1} Bug Version: 2.7.1 Priority: Critical Status: Active Replies: 28 Type:  Bug ...

 
forum_thread

Extra uninitialised entities spawned on merge()

In the following, Element is a base entity class, with a bi-directional @ManyToOne-@OneToMany relationship Element owner - List<Element> ownedElements, and Example is a subclass entity with a relationship @OneToOne Element child. #1 2012-06-05 03:25 In the following, Element is a base entity class, with a bi-directional @ManyToOne-@OneToMany relationship Elem ...

 
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Problems using Maven Repo

I've worked around this by downloading "manually" but I don't seem to be able to resolve objectdb Maven dependency automatically - have the relevant repository entry etc. in my POM, Maven doesn't seem to be able to find anything. Wondering if there are some operational problems or if I should return to scratching my head. Many thanks #1 2014-06-18 09:45 I've worked around this by downloading "manually" but I don't seem to be able to resolve objectdb Maven d ...

 
forum_thread

Wrong @Id type

Hi,  I have noticed some values of id column suddenly switched to int, although it is declared as long in our java class. Do you have idea why this happened? Screenshot attached.   #1 2014-07-01 14:36 Hi,  I have noticed some values of id column suddenly switched to int, although it is declared as lo ...

 
manual

JPA Named Queries

Explains how to define and how to run JPA named queries. A named query is a statically defined query with a predefined unchangeable query string. Using named queries instead of dynamic queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the ...

 
manual

DELETE Queries in JPA/JPQL

Explains how to apply server side bulk delete using a JPA/JPQL query. As explained in chapter 2 , entity objects can be deleted from the database by: Retrieving the entity objects into an EntityManager . Removing these objects from the EntityManager  within an active ...

 
forum_thread

High availability and other pratical questions

Hi,   I've just started developing a mobile app which will use a server side, hopefully handling a lot of processing and traffic. I was inteding to use TomEE+ with built-in OpenJPA and Postgres DB, initially on one master server but as it grows more master servers will be set (in different geo locations/data centers) using some data sync mechanism between them.   Now that i've met ObjectDB I want to check the option using it instead of postgres so I have few questions regarding it: #1 2012-10-01 19:54 Hi,   I've just started developing a mobile app which will use a server side, hopefully ...

 
issue

Exception Failed to read from file

Hello, we have found several these exceptions in our log Bug Version: 2.5.0 Priority: High Status: Closed Replies: 1 Type:  Bug ...

 
forum_thread

problems with OEM license/enhancing

we did add this section to our maven pom.xml (from within Eclipse): ... <build>   <pluginManagement> ... #1 2016-04-23 18:12 we did add this section to our maven pom.xml (from within Eclipse): ... <build> <pluginManageme ...