JPA - Entity (Managed Classes)

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Design Pattern - Data Access Object (DAO)

A data access object (DAO) is an object that provides an abstract interface to some type of database or persistence mechanism, providing some specific operations without exposing details of the database....
Java Conceptuel Diagram
J2EE - JPA and Stateless Session Bean (EJB) as Data Access Object (DAO)

Stateless EJB session beans as Data Access Object (DAO) implementation with JPA. You must use the EntityManagerFactory to get an EntityManager The resulting EntityManager instance is a PersistenceContext/Cache...
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JPA - Column Mapping

This article is the mapping of a column without relationship Every JPA entity must have a primary key. A basic attribute is one where the attribute class (datatype) is a simple type such as: ...
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JPA - Entity (Operations|Lifecycle)

All entity operations are described in the chapter 3: Entity Operations of the specification The following operations are possible: PERSIST, MERGE, REMOVE, REFRESH, DETACH FLUSH This...
Jpa Mapping Method
JPA - Entity Annotations

A key feature of EJB 3.0 and JPA is the ability to create entities that contain object-relational mappings by using (metadata) annotations rather than deployment descriptors (orm.xml) as in earlier versions....
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JPA - Entity Manager

To manage entities in your persistence application, you need to obtain an javax/persistence/EntityManagerentity manager from an javax/persistence/EntityManagerFactoryEntityManagerFactory. An javax/persistence/EntityManagerEntityManager...
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JPA - Getting Started - Hello World

A simple JPA implementation that insert an “Hello World” string in a HELLO table in a relational database. This example uses the JPA reference implementation: against an Oracle Database. Maven...
Hello Data Model Many To Many
JPA - How to model a @Many-to-Many Relationship ?

How to model a many-to-many relationship in JPA. One Hello can have several Category and One Category can have several Hello. The Ddl File: [Ddl File] One sequence: The HelloWorld entity...
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JPA - Java Persistence API (JPA)

API The Java Persistence API is the Java API for the management of persistence and object/relational mapping for: Java EE and Java SE environments The Java Persistence consists of: The Java...
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JPA - Managed Class

entities, mapped superclasses, and embedded...



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