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Numbers in JPQL and Criteria Queries

Shows how numbers, arithmetic expressions and numeric functions and operators (MOD, ABS) can be used in JPQL queries. Numeric values may appear in JPQL queries in many forms: as  numeric literals - e.g. 123 , -12.5 . as parameters - when numeric values are assigned as arguments. as  path expressions ...

 
manual

Locking in JPA

Explains how to use optimistic locking and pessimistic locking in JPA.... object (when it is stored in the database for the first time) is 1. In every transaction in which an entity object is modified its ...

 
issue

ObjectDB can't be activated

Hello, we are trying to activate objectdb on a virutalized debian 7 server, but do not have any success. Steps we made to activate the server: Bug Version: 1.04 Priority: Critical Status: Fixed Replies: 20 Type:  Bug ...

 
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 ...

 
forum_thread

Remove not working

Hello! We have a strange problem. ... before trying to gather the Extent the second time. I did not think this would be required because I had ...

 
forum_thread

Failover from Master to Slave

Good morning! I am interested in ObjectDB for a client project I am currently working on. In order to evaluate your tool I would like to know if your product has the ability to failover from a Master Database to a Slave Database and then recover back to the master when the master comes back online. I don't see any documentation about automatic failover.   Thanks Rich   ... Let's say App Server 2 is idle during this whole time but then wakes up during a period of increased load. It tried to connect ...

 
forum_thread

ffff /subscription/19606/0 Post Reply Please read carefully the posting instructions - bef ...

 
forum_thread

For what I do, this would be great as I would be able to reference pricing/sales audit records over a period of time quite easily in order to make good pricing decisions.... /subscription/18183/0 Post Reply Please read carefully the posting instructions - bef ...

 
forum_thread

NegativeArraySizeException on commiting a transaction

Hi, we started to get a java.lang.NegativeArraySizeException from ObjectDB upon changing an object in the DB and committing the transaction. I tried to repair the DB file with Database Doctor, but the same error is happening also on the fixed DB file. Btw. during fixing the DB file an Internal error was thrown (details here: http://www.objectdb.com/database/issue/285 ), but the fixing went on and created a new file. ... data structures, but with this raise we will have enough time to plan it carefully. edit ...

 
forum_thread

Hi, if Id = 0 I got javax.persistence.EntityExistsException: com.objectdb.o.UserException: Attempt to reuse an existing primary key value (ru.dz.train.test.ZeroIdTest$MyEntity:0) if Id=1 no exception code : /subscription/20447/0 Post Reply Please read carefully the posting instructions - bef ...