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Does aggregate function "greatest" work on entity objects?

Does aggregate function "greatest" work on entity objects? do not come to the function "compareTo ... static final long serialVersionUID = 1L; @Override public int compareTo(Object t ... objects are not comparable in queries. See the list of Comparable Data Types in the manual. support Support

How to define database structure and insert some initial objects from scratch

the initial database structure of our application? We know objectdb is all about objects and probably doesn't ... . That code, however, could be simple. Just build your entity objects and persist them. e.g. public class ... = emf.createEntityManager();         // Store 1000 Point objects in the database:         em

Changing existing objects from Entity to Embedded

-only, made a migration utility which read the original objects, converted them to the new classes and stored ... . Is the change of not-embedded to embedded supported by ObjectDB for existing objects? If it is, do I ... (entity classes) or embeddable. To use embedded objects you must declare classes as embeddable

ObjectDB 2.6.9_06 (embedded): Cascading merge resulting in duplicate objects

this class. If I load a NaturalPerson entity from the database, then add a new address to the object's "addresses" list and use EntityManager.merge(object) to persist it along with the new address ... "EntityManager.persist(object)" instead, only one Address entity is created (as expected). Am I

Query all objects that implements a given interface - is that possible?

Hi, I am trying query one of my DB - for all object types that implement a given interface.     TypedQuery<Signal_Interface> query =         em.createQuery("SELECT bk FROM Signal_Interface bk ... .createQuery("SELECT bk FROM Object bk WHERE bk instanceof Signal_Interface",             Signal

URGENCY, or in query does not report any objects on first operand having no results

this query does not return any objects even there are lot of objects to return for the second operand: select a from Action a where (a.state = 2 or a.state = 3) and a.type = 0 and a.transferred = 0 if the query is changed to select a from Action a where (a.state = 3 or a.state = 2) and a.type = 0

References to objects of missing obsolete entity classes

that didn't have the issue it could help. Regarding the issue itself, is it correct that the objects ... itself, is it correct that the objects are in the database but their classes have been deleted or missing? The objectdb explorer does not show any objects of the given class in the database. The class

New entity objects are duplicated on merge cascading

When merge is cascaded to a new entity object that has not been persisted ... to persist a reference to a non managed ..." exception, when the duplicated object is referenced from another new / dirty entity object by a reference with cascading persist disabled. The following test

Error reading UTF string (Serialized Objects in Explorer)

handling failed deserialization better. Still, you cannot see serialized objects in the Explorer ... object also in your application - please provide the exception stack trace (when using the last build

cannot delete objects after crash (see issue 2283)

after the crash we cannot delete specific objects, see screenshots of explorer. Database will be soon available (size 5.561.119 KB) on hummingbird-systems.com, user/pw your db name, main menu option ... monitoring shows that creating of object structures is significantly slower than with the old setting

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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