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Online Backup

applications that provide round the clock service (24/7/365) such as most web applications. Starting Online Backup The online backup can be started by executing a special query on an EntityManager (em ... under the ObjectDB home directory. Online Backup Thread Executing the backup query starts the backup
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Database Explorer

, when the Explorer starts it tries to open a connection to the most recently used database ... when the Explorer starts. The [Table (instead of Tree) as a default viewer window] check box specifies
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Database Connection using JPA

, bypassing the need for a persistence unit. Any string that starts with objectdb: or ends with .odb or ... (); } A transaction is started by a call to begin and ended by a call to either commit or rollback
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Paths and Types in JPQL and Criteria API

, and they can be used in ordering. Navigation through Path Expressions A path expression always starts ... and also serve as a starting point for building more complex paths through navigation. Giving a Path instance
0

Step 1: Create a Maven Web Project

We start by creating a new Maven-WTP dynamic web project in Eclipse: Open the [New Project] dialog box, e.g. by using File > New > Project... Select Maven > Maven Project and click Next. Verify ... >        <id>start-jetty</id>        <phase>pre-integration-test</phase>        <goals
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Step 3: Add a Context Listener Class

if not existing yet) when the web application starts, by instantiating an EntityManagerFactory ... attribute in the servlet context - when the web application starts (contextInitialized). Retrieves
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Step 1: Create a Maven Web Project

We start by creating a new Maven web project in NetBeans: Open the [New Project] dialog box, e.g. by using File > New Project... Select Maven > Maven Web Application and click Next. Choose a Project ... >       <execution>        <id>start-jetty</id>        <phase>pre-integration-test</phase>        <goals
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Step 3: Add a Context Listener Class

if not existing yet) when the web application starts, by instantiating an EntityManagerFactory ... starts (contextInitialized). Retrieves the EntityManagerFactory from the application scope attribute
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[ODB1] Chapter 6 - Persistent Objects

When a new object is constructed by the new operator, it always starts as a transient object ... above also starts out as a transient object. It, however, becomes persistent, not by an explicit ... can easily start from them, as explained in the next section. 6.3 Retrieving Persistent Objects
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[ODB1] Chapter 5 - JDO Connections

transactions. A transaction is started by a call to begin() and ended by a call to commit() or rollback ... are applied to the database is not acceptable. Before commit() starts writing to the database it stores

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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