Fast Object Database for Java - with JPA/JDO support

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What is new in ObjectDB 2.0?

ObjectDB 2.0 supports many new features and improvements, including: Most of the features of the new JPA 2.0 and JDO 2.2 APIs. User defined IDs (primary key) and sequences. Support of unlimited index keys size. SQL like queries ("select from ... where ..."). Real non blocking multithreading in

JPA Persistable Types

, however, do not have an identity (primary key) of their own which leads to some limitations (e.g ... and keys and values in maps) are either null values or instances of persistable types. In addition

Getting Foreign Key

level primary key but i also nead to get foreign key which is belongs to header. WriteObjectQuery ... got pojo name query.getPrimaryKey() by using this i can get primary key now i nead to get foreighn ... How to get Foreign key using org.eclipse.persistence.queries.WriteObjectQuery class ..? please help

Can a Set<E> be a foreign key?

I have two classes, Cell and Character. Basically, the cell is like a room, and contains a variable (private Set cellHeldCharacters;) which holds the IDs of the characters within the cell (The IDs are Primary Keys). Can I use the Foreign Key annotation for the variable, or is it illegal


get methods) Annotation on a member to define it as a primary key member of a class or persistent interface using application identity. Also used to define the primary key columns of a secondary table. Corresponds to the xml element "primary-key". Since: JDO 2.1 String column Name of the column to use

Detached Entity Objects

. same type and primary key). If the EntityManager does not manage such an entity object yet a new

JPA Exceptions

) . For example, if a transaction fails because of an attempt to store a new entity object with a primary key that is already in use by another existing entity object, the nested exception is: Other common

Storing JPA Entity Objects

already contains another entity of the same type with the same primary key, an EntityExistsException

Comparison in JPQL and Criteria API

have the same type and the same primary key value. For embeddable objects, e1 = e2 if e1 and e2 have exactly

Shared (L2) Entity Cache

and primary key: em.find(MyEntity2.class, Long.valueOf(1),      Collections.

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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