About GeneratedValue

forum_thread

Foreign key constraint issue

Hi, I'm trying to create two tables (Parent and Child) with a foreign key constraint from Child to Parent so that when the parent is deleted all children are removed as well. Unfortunately, in one specific case that foreign key constraint doesn't apply and I can't figure out what I'm missing. The definitions of the classes are as follows: ... Child {     @Id     @GeneratedValue     private long id; ... {     @Id     @GeneratedValue     private long id; ...

 
tutorial

Step 2: Define a JPA Entity Class

Explains how to define a JPA entity class in a NetBeans Web Application.... . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ; ... = 1L ;   // Persistent Fields: @Id @GeneratedValue Long id ; private String name ; private ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in an Eclipse Spring MVC web application project.... . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ; ... = 1L ;   // Persistent Fields: @Id @GeneratedValue Long id ; private String name ; private ...

 
tutorial

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class:... . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ; ... = 1L ;   // Persistent Fields: @Id @GeneratedValue Long id ; private String name ; private ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in a NetBeans Java EE 6 web application.... . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ; ... = 1L ;   // Persistent Fields: @Id @GeneratedValue Long id ; private String name ; private ...

 
forum_thread

Attempt to execute a query using a closed EntityManager

Hi again! Suddenly, my app started to throw this exception. I would really appreciate some advices. ... so it should be there after Client is set. Id has @Id @GeneratedValue(strategy = GenerationType.IDENTITY). 5. Any ideas why this ... should just return the "long" field which is @Id @GeneratedValue(strategy = GenerationType.IDENTITY)? Shouldn't it be there ...

 
api-jpa

JPA 2 Annotations

Reference (JavaDoc) of all the JPA 2 annotations, including @Entity, @Embeddable, @NamedQuery, @GeneratedValue, etc. JPA defines dozens of annotations that can be divided into the following groups: Annotations for JPA aware classes: JPA Annotations for Classes JPA Annotations for JPQL Queries Annotations for fields in JP ...

 
tutorial

Step 2: Define a JPA Entity Class

Explains how to create a JPA entity class in the NetBeans IDE.... long serialVersionUID = 1L ;   @Id @GeneratedValue private long id ;   private int ...

 
tutorial

Step 2: Define a JPA Entity Class

Explains how to create a JPA entity class in the Eclipse IDE.... long serialVersionUID = 1L ;   @Id @GeneratedValue private long id ;   private int ...

 
forum_thread

Newbie : How to return the auto-generated ID

Hello, I am new to this community, as well as JPA and ObjectDB. I want to read the auto-generated ID when I persist a new entity (with @Id @GeneratedValue annotations applied). I am following the following link : http://www.objectdb.com/tutorial/jpa/eclipse/web/entity Thanks. ... ID when I persist a new entity (with @Id @GeneratedValue annotations applied). I am following the following link ...