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Detached Entity Objects

). Retrieval by navigation from detached objects is not supported, so only persistent fields

Index Definition

contains a words field whose type is List<String>. The query retrieves the documents that contain

JPA Named Queries

" that retrieves all the Country objects in the database: @NamedQuery(name="Country.findAll", query

Literals in JPQL and Criteria Queries

retrieval by type. In JPQL an entity type literal is written simply as the name of the entity class (e.g

ObjectDB - Object Database for Java (JPA/JDO)

Boost your application database performance. Database performance is critical as it is the bottleneck in most applications. ObjectDB is extremely fast and much faster than any other JPA solution. Using a relational database management system (RDBMS) to store and retrieve Java objects requires slow

Defining a JPA Entity Class

, and accordingly, provides the ability to store Point objects in the database and retrieve Point

Step 2: Define a JPA Entity Class

class that stores and retrieves instances of the Point entity class.

Step 3: Add a Context Listener Class

starts (contextInitialized). Retrieves the EntityManagerFactory from the application scope attribute

Getting Started with JPA and Eclipse

This is the Eclipse version of the Quick Start with JPA tutorial. It demonstrates how to create and run a simple JPA application in Eclipse. The demonstrated application uses JPA to store and retrieve simple Point entity objects, where each Point has two persistent fields: x and y

Step 5: Add a JSP Page

that have already signed (which are retrieved from the request's "guests" attribute that is set by

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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