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JPA Query Expressions (JPQL / Criteria)

Query expressions are the foundations on which JPQL and criteria queries are built. Every query consists of clauses - SELECT, FROM ... >from">JPQL / Criteria Variables

Defining a JPA Entity Class

> objects from the database: package com.objectdb.tutorial; import javax ... of ObjectDB that is absent from other object oriented databases.


/EntityManager/createQuery_String">createQuery("SELECT c FROM Country c"); createQuery("SELECT c FROM Country c", Country.class); In

Database Connection using JPA

obtained from the EntityManager. An EntityManager instance ... (); } The EntityManager instance is obtained from the owning


to retrieve data from the database, UPDATE queries do not retrieve data from the database

Locking in JPA

JPA 2 supports both optimistic locking and pessimistic locking. Locking is essential to avoid update collisions resulting from simultaneous updates ... objects when they are retrieved from the database. In addition to improving efficiency (relative

ObjectDB Website - Terms and Conditions of Use

of these terms, you are prohibited from using or accessing this site. The materials contained in this web site ... copyright or other proprietary notations from the materials; or transfer

Step 3: Create an ObjectDB Data Source

;New Data Source. Select ObjectDB Data Source from ... /birt/points.odb" class="image download">points.odb database file (from the

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 ... > columns from the data set in the [Data Explorer] window (under the data set node) and dropping

[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 ... and for database access of several processes simultaneously. Moving from one mode