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JPA Reference (JavaDoc)

into the following sections: The purpose of these documentation pages is to serve as a reference. In

Retrieving JPA Entity Objects

extreme situations this might cause the retrieval of the entire database into the memory

JPA Named Queries

dynamically into the query string and results in more efficient queries. @NamedQuery


As explained in chapter 2, entity objects can be deleted from the database by: Retrieving the entity objects into an EntityManager. Removing these objects from the EntityManager within an active transaction, either explicitly by calling the remove method or implicitly by a cascading operation

JPA Annotations for Java EE

The following JPA annotations are in use to integrate JPA into a Java EE application and are managed by the Java EE container:

What's next?

This chapter introduced the basic principles of JPA using ObjectDB. You can go into details by reading the other chapters of this manual. If you prefer to get started with ObjectDB right away you can follow one of the following tutorials to create and run the example program that was described in

Java EE 6 JPA Tutorial - Eclipse Project

only if Maven Integration for WTP is installed when the Maven project is imported into the IDE). Choose

Spring MVC JPA Tutorial - Eclipse Project

Integration for WTP is installed when the Maven project is imported into the IDE). Choose or define

Step 4: Add a Controller Class

is automatically constructed and injected by Spring into the guestDao field (because it is annotated

JDO Annotations

JDO defines dozens of annotations that can be divided into the following groups:

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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