About database

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Tutorial
31

Eclipse/JPA Spring MVC Web Tutorial

database. Required Software For this tutorial you will need the following software: Java JDK 6.0 (or
Tutorial
31

NetBeans/JPA Spring MVC Web Tutorial

database. Required Software For this tutorial you will need the following software: Java JDK 6.0 (or
Manual
20

Retrieving JPA Entity Objects

The Java Persistence API (JPA) provides various ways to retrieve objects from the database ... of the database. The persistence context serves as a cache of retrieved entity objects. If a requested ... with data that is retrieved from the database (or from the L2 cache - if enabled). The new entity object
Manual
18

Storing JPA Entity Objects

New entity objects can be stored in the database either explicitly by invoking the persist method ... an instance of the Employee entity class in the database: Employee employee = new Employee("Samuel ... and changes its state to Managed. The new entity object is stored in the database when the transaction
Manual
17

Working with JPA Entity Objects [2011-04-18]

), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA ... database objects. Entity Object Life Cycle The life cycle of entity objects consists of four states ... the database. An entity object becomes Managed when it is persisted to the database
Manual
17

Working with JPA Entity Objects

), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA ... database objects. Entity Object Life Cycle The life cycle of entity objects consists of four states ... the database. An entity object becomes Managed when it is persisted to the database
Manual
17

JPA Primary Key

Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not
Manual
16

JPA Persistable Types

The term persistable types refers to data types that can be used in storing data in the database ... can be stored in the database directly. Other persistable types can be embedded in entity classes as fields. In ... persistent fields would cause data duplication in the database. Entity Classes An entity class
Manual
15

Locking in JPA

in ObjectDB (and in JPA) is always at the database object level, i.e. each database object is locked separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed
Tutorial
15

Step 3: Add a Main Class

to store Point objects in the database and then retrieve them from the database. Use copy and paste ... ) { // Open a database connection // (create a new database if it doesn't exist ... Point objects in the database: em.getTransaction().begin(); for (int i = 0; i