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Problem with @OrderBy

When I use @OrderBy and supply multiple order fields I get and error when ObjectDB Explorer expands ... is referenced as if it were an entity instead of a field of an entity. If I remove the multiple fields ... bug in handling multiple order expressions in inverse (mapped by) fields. Version 2.2.2 includes

Multi-tenant setup

Hi, does anybody have experience with multi tenant setup of objectDB. For example using multiple schema or multiple database. How to handle connections between app (Jboss Wildfly) and pass query ... with multiple databases. It is very easy when accessing databases directly (by database path

Embedable & Reference?

This is the normal behavior. Embedded objects cannot be shared by multiple references. If you have multiple references to an embedded object during persist then multiple instances of that embedded object are stored

Where Does ObjectDB Block/Lock?

PersistenceManager by multiple threads? 2) Does it lock at PersistenceManager.currentTransaction()? 3 ... are synchronized so multiple threads should be able to access and use a shared PersistenceManager instance safely ... against the same database concurrently (not in a queue) you will need multiple PersistenceManager instances

Inserted entities with strings as keys and indices needs more and more ram memory in comparing to primitive integers as keys and indices

@GeneratedValue primary keys are sequential. So when you persist multiple new objects their primary keys ... primary keys are sequential. So when you persist multiple new objects their primary keys are sequential

ArrayIndexOutOfBoundsException at com.objectdb.o.ALS.c(ALS.java:89)

it is more efficient to create a single EntityManagerFactory with multiple EntityManager instances. It is uncommon to create multiple EntityManagerFactory instances as demonstrated by your code. support Support

On ensuring ID available after persist

allocation to commit or flush - multiple IDs for multiple objects can be allocated together in

Objectdb EntityManagerFactory problem

one EntityManagerFactory per application, with multiple EntityManager instances for multiple database connections. support Support

Are Queries in ObjectDB Multithreaded ?

. However, if your application use multiple threads that execute multiple queries against ObjectDB simultaneously, then ObjectDB

Selective merge/cascade of detatched entity

memory is that they are shared between multiple threads (all using 'synchronized' operations for field ... entity objects. To avoid multiple memory objects for the same database object you may try sharing

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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