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, grouping queries and aggregate queries) which are usually missing from Object Oriented Databases are also supported by ObjectDB. The combination of Object Database features with Relational Database features ... >Up to 2,147,483,648 indices per database file. Up to 9,223,372,036,854,775,808 entity objects

a relational database management system (RDBMS) to store and retrieve Java objects requires slow conversions between graphs of Java objects and flat database table rows. Object Relational Mapping (ORM ... is an extremely easy to use pure Java Object Database, which supports JPA with no mapping

. It is the only object database with built in support for the Java Persistence API (JPA). It also supports a more recent and advanced version of the Java Data Objects (JDO) API than competing object databases.databases. For example, most object databases

the database. The retrieval of objects does not require an active transaction because it does not change ... object is returned as is. Otherwise, the object data is retrieved from the database and a new managed ... the database and the persistent fields are initialized, lazily, when the entity object is first accessed

of traditional visual database tools. Every row in the table represents a single object, every column ... database object. This type of viewer is useful for viewing data of a simple object model. In ... , is preferred. A Tree window displays objects as a tree. Every database object is represented by a tree

New entity objects can be stored in the database either explicitly by invoking ... its state to Managed. The new entity object is stored in the database when the transaction is committed.database independently. Objects

the database. Managing an ObjectDB Object Database using JPA requires using entity objects for many operations, including storing, retrieving, updating and deleting database objects. and has no representation in the database. An entity object becomes Managed

>em, that represents a JPA connection to the object database, we can use it to store, retrieve, update and delete database objects. Storing New Entity Objects The following code fragment stores 1,000 Point objects in the database:

/EntityManager">EntityManager but still represent objects in the database. Compared ... to detached entity objects are not stored in the database unless modified detached objects are Detached entity objects are objects in a special

This chapter describes how to use ObjectDB to manage database objects. database content, or a transient object, i.e. not related to any database. . This method (discussed in the next section) enables the assignment of names to objects in the database