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/logical">Logical operators: AND, OR, NOT. In addition, JPA queries support ... _operators">Logical expressions (and, or, not, isTrue).

ObjectDB requires Java 5 or later (Java 6 is preferred). As a pure Java application, ObjectDB should be able to run on any platform that supports the Java Standard Edition. Either the Java Development Kit (JDK) or the Java Runtime Environment (JRE) can be used. A version

. JPQL keywords, for example, can appear in queries either in upper case (e.g. SELECT) or in lower ... clause declares one or more query variables (also known as identification variables). Query

and returns the absolute value, which is always a positive number or zero. For example:or

annotation is attached to exactly one entity class or mapped superclass - usually ... class or mapped superclass. Therefore, to be able to always locate any named query at runtime a list

ObjectDB is distributed as a zip file. Just download and extract the ObjectDB distribution zip file. No need to run any install or setup program. You can uninstall ObjectDB by deleting the ObjectDB directory. ObjectDB does not modify the registry or any other system file.

of a relational database is mandatory (e.g. as a result of a customer request or when a new ... development and better performance and use a JPA ORM provider (Hibernate, TopLink, EclipseLink or DataNucleus

.1 or JBoss AS 6. If you need a web application that can run on a simple servlet container (such as Tomcat or Jetty) see the JPA Web App Tutorial. The demo

>Run the project: Select Run > Run Main Project... (or F6). Choose or define the server and click OK. If  a browser is not opened - open

> Listener objects can be bound to one or more persistence capable classes by invoking the PersistenceManagerFactory level or the PersistenceManager level.