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67

A few questions on object database design

objects improves performance by eliminating the need to persist and retrieve small pieces of data separately. On the other hand, if the entity object becomes too big and it includes a lot of data
67

Problem with merging / persisitng objects with @Embeddable field

Hi, After migration to version 2.4.2_01, I have noticed a strange problem with persisting object with field that contains @Embeddable object. Please check attached exception. Relation between entities looks like this: @Entity public class ProductKit extends BaseEntity implements Serializable
67

Optimistic lock failed : object has version .. instead of ..

I do basic storage and retrieval of Record class. When I stress the retrieval/storage with Apache JMeter sometimes (at some requests) I get this exception. [ObjectDB 2.5.0] javax.persistence.OptimisticLockException Optimistic lock failed for object entities.Record#'1405/838/2011/121' (object
67

Adding multi part path index on non-embedable object member

Is there a way to add single member index on members of a object member which is not configured embedable but is/are mapped by id like the two members below. @Entity public class Customer ... { ... } There is a documentation says it works on embedded objects only. So since it reference only, what is suggested
67

JPA CriteriaQuery -- Iterate Expression<List<Object>>

Hi, I am new to JPA and in particular the CriteriaQuery API. I have a simple CriteriaQuery where I pattern match a simple search String against field entires in a Person entity... i.e. the searchString is always decorated with %searchString%. The Person object can contain many Record objects. I
67

finding post-persist pre-commit objects

Hi, I'm wondering if there is a way to have post-persisted, pre-committed, objects show up in queries? ie: the object has been persisted, but not yet committed. Dave dmoshal David Moshal Yes, by setting the flush mode. support Support thanks, worked for me. dmoshal David Moshal
66

Too many objects for this ObjectDB Edition

Hi, I have been encountering an error when my odb file is larger than 512kb "Too many objects for this ObjectDB Edition." I haven't been able to find any info about this online and was wondering if anyone has encountered a similar problem. I had been using an older version of ObjectDB
66

impossible to drop a table with 50 million objects

these objects in batches, using several transactions, each transaction will delete the results
13

Post-compile enhancement sometimes causes error in generic loops: incompatible types found: java.lang.Object: required: Entity

don't understand the circumstances) gives this error: incompatible types found: java.lang.Object ... but it is inconvenient to have to remove generic loops just because of enhancement: for (Object os
13

not possible to add an existing object to an array via explorer

when trying to add an existing object via context menu/add existing object an entering the id the attached message appears (see attachment): objectdb.java.util.ArrayList cannot be cast to java.util.Map hgzwicker Hans-Georg Zwicker Thank you for your report. Build 2.7.1_02 should fix this exception. support Support

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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