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Database Replication and Clustering

can manage different types of databases, including master databases, slave database (by using one or

Detached Entity Objects

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

Collections in JPQL and Criteria Queries

enables as an extension to standard JPQL to use both operators (IN and MEMBER OF) with any type

Logical Operators in JPQL and Criteria API

> that represents many operator and function expressions whose type is boolean - such as comparison operators

JPA Metamodel API Attributes

The following interfaces and enum types represent attributes (persistent fields and properties) in the JPA Metamodel API: See the Metamodel Attribute Interface Hierarchy section for more details and examples.

Retrieving JPA Entity Objects

retrieval by using a lazy fetch type: @Entity class Employee { : @ManyToOne(fetch=FetchType

JPA Queries

a cleaner alternative that enables building a dynamic query by using instances of special types

Step 2: Entity Class and Persistence Unit

/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction-type

Miscellaneous JDO Annotations

This section contains miscellaneous JDO annotations and associated enum types:

JDO External Listeners

The following types can be used to implement external listener classes for JDO lifecycle events: Listener objects can be bound to one or more persistence capable classes by invoking the addInstanceLifecycleListner method either at the PersistenceManagerFactory level or the PersistenceManager level.

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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