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

> 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

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

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

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

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

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

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