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154

Database Explorer

ObjectDB Database Explorer is a visual GUI tool for managing ObjectDB databases. It can be used to view data in ObjectDB databases, execute JPQL and JDOQL queries and edit the content of databases ... to the Database Opening a Database Connection To open a local database file in embedded mode use the File > Open
152

Database Management Settings

The <database> configuration element specifies back end (database engine) settings ... <database> element: <database> <size initial="256kb" resize="256kb" page="2kb" /> <recovery ... ="32mb" programs="500" /> <extensions drop="temp,tmp" /> </database> The <size> element <size
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Database Connection using JPA

A connection to a database is represented by an EntityManager instance, which also provides functionality for performing operations on a database. Many applications require multiple database connections ... database connection, using a separate EntityManager instance, for every HTTP request. The main role
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Database Replication and Clustering

, the same database is managed on multiple machines (nodes), possibly in different geographic locations ... master-slave replication, the master node manages the main (master) database, which supports Read / Write operations. The other (slave) nodes in the cluster manage identical copies of the same database
151

ObjectDB Object Database Features

support of the JPA and JDO APIs. Fundamental features of relational databases (e.g. primary keys, derived ... Databases are also supported by ObjectDB. The combination of Object Database features with Relational Database features brings you the best of both worlds. Capabilities & Scalability ObjectDB
147

Database Doctor

database file Checks a given ObjectDB database file, verifies that it is healthy and valid ... of a corrupted ObjectDB database file Repairs a corrupted ObjectDB database file by creating a new fresh database file and then copying all the recoverable data in the corrupted database file
146

CRUD Database Operations with JPA

Given an EntityManager, em, that represents a JPA connection to the object database, we can use it to store, retrieve, update and delete database objects. Storing New Entity Objects The following code fragment stores 1,000 Point objects in the database: em.getTransaction().begin(); for (int
146

Obtaining a JPA Database Connection

In JPA a database connection is represented by the EntityManager interface. Therefore, in order to manipulate an ObjectDB database we need an EntityManager instance. Operations that modify database ... of EntityManagerFactory that represents the relevant database and then we can use that factory instance
143

Database Transaction Replayer

can apply recorded database operations on a matching database backup (if available). This ability is useful for two different purposes: It enables recovery from a database failure by replaying ... & Recording Files When recording is enabled, ObjectDB maintains for every database file a recording
143

ObjectDB - Object Database for Java (JPA/JDO)

Boost your application database performance. Database performance is critical as ... . Using a relational database management system (RDBMS) to store and retrieve Java objects requires slow conversions between graphs of Java objects and flat database table rows. Object Relational Mapping

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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