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6

Entity Management Settings

hollow, and loading their persistent content lazily, when they are accessed, could improve
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Database Connection using JPA

= emf.createEntityManager(); try { // TODO: Use the EntityManager to access the database
6

Index Definition

BY clauses) saving the need to access the entities themselves. Instead, because of the comparison
6

ObjectDB License

, but using ObjectDB on client machines merely to access remote ObjectDB databases (for which licenses
6

JPA Persistable Types

. It can contain constructors, methods, fields and nested types with any access modifiers (public, protected
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Paths and Types in JPQL and Criteria API

, a NullPointerException is thrown on any attempt to access a field or a method via a null reference. In JPQL
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Step 5: Add a JSP Page

name. The Folder should be WEB-INF (to prevent accessing the JSP directly not through Spring). Click
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Step 3: Define a Spring DAO Component

Operations on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC component: Open the [New Java Class] dialog box by right clicking the guest package node (in the [Projects] window under Source Packages) and selecting New
0

JDO Annotations for Classes

JDO supports two modes of persistable classes that can be set by the following annotations: Non persistable classes that should be enhanced (because of accessing persistent fields of other classes directly) can be marked with: The identity mode of persistence capable classes can be specified by using:
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[ODB1] Chapter 4 - JDO Metadata

accesses a field is the field value loaded automatically by ObjectDB from the database. If the field

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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