About Object Database

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Tutorial
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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 ... - for storing a new Guest entity object in the database. getAllGuests - for retrieving all the existing Guest objects from the database. By using Spring components we can move some work from
Tutorial
12

Step 3: Define a Spring DAO Component

Operations on the database will be performed by an instance of a Data Access Object (DAO ...  Guest entity object in the database. getAllGuests - for retrieving all the existing Guest objects ... .annotation.Transactional; @Component public class GuestDao { // Injected database connection
Manual
12

Chapter 1 - Quick Tour

on how to start using JPA in your IDE with the ObjectDB object database. Given the simplicity of ObjectDB, that should be quick and easy even for a novice. ... ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete) on ObjectDB databases. The example program that this chapter presents manages a simple database
Manual
12

Auto Generated Values

number generator for every database. This number generator is used to generate automatic object IDs for entity objects with no primary key fields defined (as explained in the previous section). The same ... a primary key for every new entity object. These generated values are unique at the database level
Tutorial
12

Step 4: Add a Servlet Class

is constructed and stored in the database. All the Guest entity objects are retrieved from ... { // Obtain a database connection: EntityManagerFactory emf = (EntityManagerFactory ... ") .forward(request, response); } finally { // Close the database
Tutorial
12

Step 4: Add a Servlet Class

the next tutorial step) - a new Guest entity object is constructed and stored in the database. All the Guest entity objects are retrieved from the database and stored in the request's "guest" attribute ... ServletException, IOException { // Obtain a database connection: EntityManagerFactory
JPA Doc
11

javax.persistence.EntityManager

void refresh(Object entity) Refresh the state of the instance from the database, overwriting changes ... - if the entity no longer exists in the database Since: JPA 2.0 void refresh(Object entity, LockModeType ... database. Since: JPA 1.0 See Also: Query TypedQuery CriteriaQuery PersistenceContext Learn how to use
Tutorial
11

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... provider with the specified database url. The next step is adding an EJB Session Bean that will manage Guest entity objects. ... the [Provider and Database] step just click Finish to generate a default persistence.xml file
Tutorial
11

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class: Right click ... that should represent Guest objects in the database was created in the project (under Java Resources ... guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file
Tutorial
11

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New ... to create the new class. The new class should represent Guest objects in the database. Use copy ... + ")"; } }  The new class should represent Guest objects in the database. Besides the @Entity