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javax.persistence Annotation Id Target: Fields (including property get methods) Specifies the primary key of an entity. The field or property to which the Id annotation is applied ... : @Id public Long getId() { return id; } Since: JPA 1.0 See Also: Column GeneratedValue Learn

JPA Primary Key

an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not ... key field: @Entity public class Project { @Id @GeneratedValue long id; // still set automatically : } The @Id annotation marks a field as a primary key field. When a primary key field

JDO Predefined ID Classes

An object ID is a combination of a persistence capable class and a primary key. It provides a unique representation of a persistent object. The following classes serve as predefined ID classes for persistence capable classes with a simple single field primary key: Object IDs are used in many

Step 1: Create a Maven Web Project

a filter, select maven-archetype-webapp in the artifact list and click Next. Enter Group Id (e.g. Guestbook), Artifact Id (e.g. Guestbook), Version (e.g. 1.0) and Package (guest), and click Finish ... > </properties> <repositories> <repository> <id>objectdb</id> <name>ObjectDB Repository

Step 1: Create a Maven Web Project

Name (e.g. Guestbook) and select Java EE 5. Enter Maven Group Id (e.g. com.objectdb.tutorial.spring ... .sourceEncoding> </properties> <repositories>   <repository>    <id>objectdb</id>    <name>ObjectDB ... >        <id>enhance</id>        <phase>process-classes</phase>        <goals>         <goal>java

Step 2: Entity Class and Persistence Unit

.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private String name; private Date signingDate; // Constructors

Getting Started with JPA and Eclipse

. For this tutorial, besides the Java JDK (5 or above) and the Eclipse IDE (either Eclipse IDE for Java EE Developers or Eclipse IDE for Java Developers), you only need to download and extract the ObjectDB distribution


Static Field javax.jdo.Constants String PMF_ATTRIBUTE_SERVER_TIME_ZONE_ID The name of the persistence manager factory element's "server-time-zone-id" attribute. Since: JDO 2.1


Static Field javax.jdo.Constants String PROPERTY_SERVER_TIME_ZONE_ID Mapping "javax.jdo.option.ServerTimeZoneID" Since: JDO 2.1

[ODB1] Chapter 6 - Persistent Objects

and improve efficiency, but they also have some limitations. An embedded object cannot have an object ID ... object). 6.2 Object IDs and Names Identifying database objects by unique IDs and by names is useful ... methods for database objects. The first method, object IDs, is supported by JDO. The second method

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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