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TimeSeries and ObjectDB

Hi, I am using ObjectDB for storing TimeSeries (large ones) - when I get new points to add to the TimeSerie entity - I currently have to retrieve the whole timerserie since beginning of time, then add the new points, and then commit the whole timeserie again. I looked at Update queries - but they seem to be handling simple tasks - like multiply one field of the entity by a constant. More generally: 1- is ObjectDB suitable for large time series? 2/ If so - any example would be helpful - on how to organise the data. #1 2015-03-16 12:29 Hi, I am using ObjectDB for storing TimeSeries (large ones) - when I get new points to add to the TimeSer ...

 
tutorial

Step 3: Add a Main Class

Explains how to add the JPA tutorial Main class in Eclipse.... em. getTransaction ( ) . begin ( ) ; for ( int i = 0 ...

 
forum_thread

Query on Embedded Primary Key?

Hi, I am trying to use Embedded Primary Key - but seems I can't retrieve them correctly with the query below - the query seem to work fine for other field (in the code = primkeycopy). The error I get when is below - it complains about a casting issue. Let me know how to fix it - Thanks  EKK   ... ; em. getTransaction ( ) . begin ( ) ; em. persist ( new OBJ2 ...

 
forum_thread

OutofMemory error with Object DB 2.0

Hi, I am getting the below OutOfMemoryError after I have migrated from objectdb 1.0 to 2.0 The application works with 256MB heap size with objectdb 1.0  But on 2.0 even with max heap size of 1024MB, I get this error. The application reads xml file of around 1GB and creates a new odb file and inserts 200 records at a time. ... object from the same PersistentManager is used to begin the transaction. With objectdb 2.x do we need to close ... ...

 
forum_thread

Drop in Client/server mode not working

Hi, can't seem to get drop to work in c/s mode: version: objectdb-2.3.5_04 config: <extensions drop="tmp" /> url: 'objectdb://localhost/testStorage1.tmp;drop;user=admin;password=admin'   suggestions? David   ...   em. getTransaction ( ) . begin ( ) ; em. persist ( new MyEntity ...

 
api-jpa

getTransaction()

Return the resource-level EntityTransaction object.(Method of javax.persistence.EntityManager)

 
issue

NullPointer running multiple client against server

Hi, I'm running objectdb in server mode, config as it comes out of the box. In this case the database is being used as a queue with multiple seperate processes, each with multiple threads, writing messages. The message is split into a lightweight metadata message to allow fast searching and a more heavy weight data message. The put methods are shown below. The message is made up of an id, insert-time, priority and the payload is a large string. ... ) ; em. getTransaction ( ) . begin ( ) ; try { em. persist ( ...

 
forum_thread

@MappedSuperclass and @Transient not working as I expected

The problem could be my expectation, since I'm fairly inexperienced with JPA.  But here is the problem: The base class of my entity hierarchy is annotated as @MappedSuperclass, and one of its fields is annotated @Transient.  I expected that when I persist a subclass, no table would be created for the superclass, and the transient field would not appear in any table. The actual result is that there is a table for the superclass.  When I try to examine it in ObjectDB Explorer, it throws a NPE. ... ) ; em. getTransaction ( ) . begin ( ) ; DataObject merged = em. merge ( ...

 
forum_thread

Stalling on "run File" in Netbeans when using -javaagent:lib/objectdb.jar

This is not a question to ObjectDB support, it is a discussion item for ObjectDB users who use Netbeans IDE. I am encountering the following problem when using enhancement with Netbeans IDE 7.1. To enable enhancement I use the following in the Project Properties dialog Run section under VM Options: -javaagent:lib/objectdb.jar where there is a lib folder under the main project folder. This works fine for a Netbeans Web Application (that runs in Glassfish as web application container). #1 2012-03-15 06:51 This is not a question to ObjectDB support, it is a discussion item for ObjectDB users who use Netbeans IDE. ...

 
forum_thread

Need help to make this test work and define proper annotations for entities Lists

Hi, I can't get this simple test case to work, i know it is probably due to the lack of proper annotations on entities list, could anyone help me to define them? NB in this test case I didn't set all entities methods for the sake of clarity, also in actual application no field are public nor static and no entity is static.    ... ; em. getTransaction ( ) . begin ( ) ; OrderDat ord = new OrderDat ...