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Defining a JPA Entity Class

objects from the database: package com.objectdb.tutorial; import javax.persistence.Entity ... sequential value generation. This is a very powerful feature of ObjectDB that is absent from other object oriented databases.


for both Query and TypedQuery: Query q1 = em.createQuery("SELECT c FROM Country c"); TypedQuery<Country> q2 = em.createQuery("SELECT c FROM Country c", Country.class); In the above code

Database Connection using JPA

instance obtained from the EntityManager. An EntityManager instance also functions as a factory ... } finally { em.close(); } The EntityManager instance is obtained from the owning


an alternative way of updating entity objects. Unlike SELECT queries, which are used to retrieve data from the database, UPDATE queries do not retrieve data from the database, but when executed, update

Locking in JPA

JPA 2 supports both optimistic locking and pessimistic locking. Locking is essential to avoid update collisions resulting from simultaneous updates to the same data by two concurrent users. Locking ... for locking entity objects when they are retrieved from the database. In addition to improving

ObjectDB Website - Terms and Conditions of Use

from using or accessing this site. The materials contained in this web site are protected by ... notations from the materials; or transfer the materials to another person or "mirror" the materials

Step 3: Create an ObjectDB Data Source

Explorer] window and selecting New Data Source. Select ObjectDB Data Source from the list of available ... connection url: Download and save the points.odb database file (from the Quick Start tutorial

Step 6: Design a BIRT Report Table

In this final step we will add a simple table to the report: Open the [Insert Table] dialog box by dragging a Table from the [Palette] window and dropping it on the report design (.rptdesign) layout ... the third field and click OK. Fill the table with data by dragging the x and y columns from the data set

[ODB1] Chapter 1 - About ObjectDB

ObjectDB for Java/JDO is a powerful Object Database Management System (ODBMS) written entirely in Java. It can efficiently handle a wide range of database sizes, from a few KBs to hundreds of GBs ... remote databases and for database access of several processes simultaneously. Moving from one mode


: ObjectIdFieldManager This interface is used to store fields from the Object id instance. It is used by the method ... . This field was retrieved from the field of the ObjectId. Parameters: fieldNumber - the field number of the key field. value - the value of the field from the ObjectId. Since: JDO 1.0 void storeByteField(int

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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