About database

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Manual
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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 how to use JPA to store, retrieve, update and delete database objects.             Explains
Manual
8

ObjectDB Developer's Guide [2018-09-11]

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 how to use JPA to store, retrieve, update and delete database objects.             Explains
JPA Doc
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javax.persistence.EntityManager

database. Since: JPA 1.0 See Also: Query TypedQuery CriteriaQuery PersistenceContext Learn how to use ... entities to become detached. Changes made to entities that have not been flushed to the database will not ... if any (including removal of the entity), will not be synchronized to the database. Entities
Tutorial
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Step 4: Run the Application

for the first time, a new ObjectDB database file is generated in the db subdirectory under the ObjectDB installation directory. Running the application again will use the existing database file to store an additional 1,000 objects. You can view the content of the database file by opening it in the ObjectDB
FAQ
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What are the main benefits of using ObjectDB?

performance. Reducing Development Time and Costs ObjectDB makes database programming easier and faster. The ability to store ordinary objects in the database directly can simplify the code significantly ... fields can be stored by ObjectDB simply as part of the containing object. Relational databases lack
Manual
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GROUP BY and HAVING clauses

clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects ... over all the Country objects in the database. The GROUP BY clause groups these Country objects by
Tutorial
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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 ... in the database. Besides the @Entity annotation and the id field (and its annotations) - the Guest ... is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.
Manual
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Paths and Types in JPQL and Criteria API

over all the Country objects in the database. For a country with no capital city, such as Nauru, c.capital ... of all the entity objects in the database, excluding Country entity objects: SELECT COUNT(e) FROM ... is an extension of ObjectDB that can be used to iterate over all the entity objects in the database
Result
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ObjectDB License Agreement [ver. 2.0.4]

the ObjectDB Database Management System software ("The Software"), subject to the terms and provisions ... and objects in a database files. The full edition of the Software (without the restrictions ... and only as part of the Customer's product ("The Product"). The Product is not a Database
Tutorial
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Step 4: Add a Servlet Class

Guest entity object is constructed and stored in the database. All the Guest entity objects are retrieved from the database and stored in the request's "guest" attribute. Then the processing ... " attribute to generate the page output. Notice that operations on the database are carried on by the GuestDao