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JPA Query Structure (JPQL / Criteria)

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

Numbers in JPQL and Criteria Queries

a specified argument and returns the absolute value, which is always a positive number or zero ... may be either another numeric expression or a simple Java numeric object: // Create path and parameter

JPA Named Queries

is attached to exactly one entity class or mapped superclass - usually to the most relevant entity ... that named queries may be attached to any entity class or mapped superclass. Therefore, to be able

How to install ObjectDB?

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.

Is ObjectDB better than Object Relational Mapping (ORM)?

database is mandatory (e.g. as a result of a customer request or when a new application is developed ... a JPA ORM provider (Hibernate, TopLink, EclipseLink or DataNucleus) to access relational databases when necessary - with exactly the same code.

Java EE Web Tutorial

beans) it requires a full Java EE 6 application server, such as GlassFish 3.0.1 or JBoss AS 6. If you need a web application that can run on a simple servlet container (such as Tomcat or Jetty

Java EE 6 JPA Tutorial - NetBeans Project

the project: Select Run > Run Main Project... (or F6). Choose or define the server and click OK

Step 2: Entity Class and Persistence Unit

) and selecting New > Entity Class... (or New > Other... > Persistence > Entity Class and clicking ... the persistence.xml file in a text editor (by right clicking and selecting Edit or by double click

Spring MVC JPA Tutorial - Maven Project

The Spring MVC JPA tutorial provides step by step instructions on how to build a simple Java/JPA Spring MVC database driven web application in Eclipse or NetBeans. Building a new application step by ... for the Jetty embedded server. It is not necessary to download and install ObjectDB or a Java web server

JDO External Listeners

The following types can be used to implement external listener classes for JDO lifecycle events: Listener objects can be bound to one or more persistence capable classes by invoking the addInstanceLifecycleListner method either at the PersistenceManagerFactory level or the PersistenceManager level.

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.

Need Help?

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