About Object Database

71-80 of 200Refresh
Tutorial
16

Step 4: Add a Servlet Class

the database. All the Guest entity objects are retrieved from the database and stored in the request's ... response) throws ServletException, IOException { // Obtain a database connection ... , response); } finally { // Close the database connection: if (em
Tutorial
16

Step 4: Add a Servlet Class

) - a new Guest entity object is constructed and stored in the database. All the Guest entity objects ... , IOException { // Obtain a database connection: EntityManagerFactory emf ... { // Close the database connection: if (em.getTransaction().isActive
Manual
16

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
Forum
16

Best practice: Database update/migration of embedded databases in products

is now held otherwise. The product store user data in the ObjectDB-Database. Example: V1.0: EntityPerson ... city;}     DB3: [name=”Max Mustermann”; zip=”26135”; city=”Oldenburg”] How can we load the Database ... -> V2.0 directly, and you make sure that on upgrade all the old objects are converted and stored in
JPA Doc
15

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
15

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
Tutorial
15

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
15

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 ... to create the new class. A new class that should represent Guest objects in the database was created in ... database url. The next step is adding an EJB Session Bean that will manage Guest entity objects.
Tutorial
15

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 ... the [Provider and Database] step click Finish to generate a default persistence.xml file ... fill the fields with arbitrary values to enable it. A new entity class that should represent Guest objects in
Tutorial
15

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