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Manual
10

ObjectDB Developer's Guide

Welcome to ObjectDB for Java/JPA Developer's Guide. Here you can learn how to develop database ... the following six chapters: Demonstrates basic database programming using ObjectDB and JPA. Shows ... , retrieve, update and delete database objects. Explains how to use the JPA Query Language (JPQL). Presents
Manual
10

Setting and Tuning of JPA Queries

on which they were invoked). Flush Mode (setFlushMode) Changes made to a database using an EntityManager ... . Therefore, before a query is executed, uncommitted database changes (if any) have to be flushed to the database in ... ); Flushing changes to the database before every query execution affects performance significantly
Tutorial
10

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... to create the new class. The new class should represent Guest objects in the database. Use copy ... + ")"; } }  The new class should represent Guest objects in the database. Besides the @Entity
Tutorial
10

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... the [Provider and Database] step just click Finish to generate a default persistence.xml file ... in the database was created in the project (under Source Packages > guest). Use copy and paste
Tutorial
10

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... to create the new class. A new class that should represent Guest objects in the database was created in ... entity class will represents guests in the database. We also need to configure JPA by setting a META-INF
Tutorial
10

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... the [Provider and Database] step click Finish to generate a default persistence.xml file ... the database was created in the project (under Source Packages > guest). Use copy and paste to replace
Tutorial
10

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Right click ... that should represent Guest objects in the database was created in the project (under Java Resources ... guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file
Tutorial
10

Step 3: Add a Context Listener Class

The Guest entity objects will be stored in an ObjectDB database, which will be represented by ... a ServletContextListener to perform initialization and cleanup operations: The database will be opened (or created ... . The database will be closed when the web application stops (or when the web server shuts down), by
Tutorial
10

Step 3: Add a Context Listener Class

The Guest entity objects will be stored in an ObjectDB database, which will be represented by ... a ServletContextListener to perform initialization and cleanup operations: The database will be opened (or created ... . The database will be closed when the web application stops (or when the web server shuts down), by
Manual
10

WHERE clause (JPQL / Criteria API)

JPQL query that retrieves selective objects from the database. Out of the four optional clauses ... of this query defines an iteration over all the Country objects in the database using the c range ... the WHERE predicate. For entity classes with millions of objects in the database there is a huge