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| |
| <h1>JPA Hibernate</h1> |
| </div> |
| </div> |
| </div> |
| <div class="row"> |
| |
| <div class="col-md-12"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Este ejemplo muestra la persistencia, eliminación y creación de una consulta en JPA Hibernate. |
| La API de persistencia de Java (JPA) es una especificación de Java para acceder, persistir y administrar datos entre objetos / clases Java y una base de datos relacional.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Para ejemplificar el uso de JPA, persistiremos un objeto (Película) en la base de datos.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Se han agregado enlaces a la documentación en partes clave del ejemplo para preguntas y como una forma de fomentar la lectura en busca de detalles.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_movie">Movie</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Aquí tenemos una clase con algunos detalles. Ver la anotación |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/Entity.html">@Entity</a> |
| arriba de la declaración de clase, estamos diciendo que esta clase es una entidad (una tabla en la base de datos). Todavía tenemos dos anotaciones más sobre el atributo id, una de las cuales es |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/Id.html">@Id</a>, |
| la anotación, indica que este atributo es el identificador de la entidad y la otra anotación |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/GeneratedValue.html">@GeneratedValue</a> |
| indica que la generación de los identificadores únicos será administrada por el proveedor de persistencia.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.h3jpa; |
| |
| import javax.persistence.Entity; |
| import javax.persistence.GeneratedValue; |
| import javax.persistence.GenerationType; |
| import javax.persistence.Id; |
| |
| @Entity |
| public class Movie { |
| |
| @Id |
| @GeneratedValue(strategy = GenerationType.AUTO) |
| private long id; |
| |
| private String director; |
| private String title; |
| private int year; |
| |
| public Movie() { |
| } |
| |
| public Movie(String director, String title, int year) { |
| this.director = director; |
| this.title = title; |
| this.year = year; |
| } |
| |
| public String getDirector() { |
| return director; |
| } |
| |
| public void setDirector(String director) { |
| this.director = director; |
| } |
| |
| public String getTitle() { |
| return title; |
| } |
| |
| public void setTitle(String title) { |
| this.title = title; |
| } |
| |
| public int getYear() { |
| return year; |
| } |
| |
| public void setYear(int year) { |
| this.year = year; |
| } |
| |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_movies">Movies</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ahora tenemos dos cosas importantes: la anotacion |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/PersistenceContext.html">@PersistenceContext</a> |
| y la declaracion |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/EntityManager.html">EntityManager</a>. |
| es la interfaz con los métodos principales de JPA como persistir, eliminar, fusionar, buscar y otros …​ |
| Anotamos el |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/EntityManager.html">EntityManager</a> |
| com |
| <a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/PersistenceContext.html">@PersistenceContext</a>, um contexto de persistência é um gerenciamento de entidades onde, todo contexto de persistência é associado com uma unidade de persistência (persistence-unit), un contexto de persistencia es una gestión de entidad donde cada contexto de persistencia asociado con una unidad de persistencia, crearemos un persistence.xml para esto.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.h3jpa; |
| |
| import javax.ejb.Stateful; |
| import javax.persistence.EntityManager; |
| import javax.persistence.PersistenceContext; |
| import javax.persistence.PersistenceContextType; |
| import javax.persistence.Query; |
| import java.util.List; |
| |
| @Stateful |
| public class Movies { |
| |
| @PersistenceContext(unitName = "movie-unit", type = PersistenceContextType.EXTENDED) |
| private EntityManager entityManager; |
| |
| public void addMovie(Movie movie) throws Exception { |
| entityManager.persist(movie); |
| } |
| |
| public void deleteMovie(Movie movie) throws Exception { |
| entityManager.remove(movie); |
| } |
| |
| public List<Movie> getMovies() throws Exception { |
| Query query = entityManager.createQuery("SELECT m from Movie as m"); |
| return query.getResultList(); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_persistence_xml">persistence.xml</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Aquí definimos qué base de datos persistirá nuestras películas, y realizamos otras configuraciones como: definir una unidad de persistencia con el nombre de unidad de la película, seguido de la definición del proveedor/implementación de JPA (en este caso Hibernate) y establecemos algunos propiedades para hibernar:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre><persistence version="1.0" |
| xmlns="http://java.sun.com/xml/ns/persistence" |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> |
| <persistence-unit name="movie-unit"> |
| <provider>org.hibernate.ejb.HibernatePersistence</provider> |
| <jta-data-source>movieDatabase</jta-data-source> |
| <non-jta-data-source>movieDatabaseUnmanaged</non-jta-data-source> |
| <properties> |
| <property name="hibernate.hbm2ddl.auto" value="create-drop"/> |
| <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/> |
| </properties> |
| </persistence-unit> |
| </persistence></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_moviestest">MoviesTest</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ahora hacemos una prueba, persistiendo tres películas, luego realizamos una búsqueda y finalmente las eliminamos.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.h3jpa; |
| |
| import junit.framework.TestCase; |
| |
| import javax.ejb.embeddable.EJBContainer; |
| import javax.naming.Context; |
| import java.util.List; |
| import java.util.Properties; |
| |
| /** |
| * @version $Revision: 607077 $ $Date: 2007-12-27 06:55:23 -0800 (Thu, 27 Dec 2007) $ |
| */ |
| public class MoviesTest extends TestCase { |
| |
| public void test() throws Exception { |
| final Properties p = new Properties(); |
| p.put("movieDatabase", "new://Resource?type=DataSource"); |
| p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver"); |
| p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb"); |
| |
| final Context context = EJBContainer.createEJBContainer(p).getContext(); |
| Movies movies = (Movies) context.lookup("java:global/jpa-hibernate/Movies"); |
| |
| movies.addMovie(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992)); |
| movies.addMovie(new Movie("Joel Coen", "Fargo", 1996)); |
| movies.addMovie(new Movie("Joel Coen", "The Big Lebowski", 1998)); |
| |
| List<Movie> list = movies.getMovies(); |
| assertEquals("List.size()", 3, list.size()); |
| |
| for (Movie movie : list) { |
| movies.deleteMovie(movie); |
| } |
| |
| assertEquals("Movies.getMovies()", 0, movies.getMovies().size()); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <h1 id="_ejecutando" class="sect0">Ejecutando</h1> |
| <div class="paragraph"> |
| <p>Para ejecutar el ejemplo a través de maven:</p> |
| </div> |
| <div class="paragraph"> |
| <p>Acceda a la carpeta del proyecto:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">cd jpa-hibernate</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>y ejecute:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">mvn clean install</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Lo que generará una salida similar a la siguiente:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-console" data-lang="console">------------------------------------------------------- |
| T E S T S |
| ------------------------------------------------------- |
| Running org.superbiz.injection.h3jpa.MoviesTest |
| Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06 |
| http://tomee.apache.org/ |
| INFO - openejb.home = /Users/dblevins/examples/jpa-hibernate |
| INFO - openejb.base = /Users/dblevins/examples/jpa-hibernate |
| INFO - Using 'javax.ejb.embeddable.EJBContainer=true' |
| INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service) |
| INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager) |
| INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC Database) |
| INFO - Found EjbModule in classpath: /Users/dblevins/examples/jpa-hibernate/target/classes |
| INFO - Beginning load: /Users/dblevins/examples/jpa-hibernate/target/classes |
| INFO - Configuring enterprise application: /Users/dblevins/examples/jpa-hibernate |
| INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-id=Default Stateful Container) |
| INFO - Auto-creating a container for bean Movies: Container(type=STATEFUL, id=Default Stateful Container) |
| INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container) |
| INFO - Auto-creating a container for bean org.superbiz.injection.h3jpa.MoviesTest: Container(type=MANAGED, id=Default Managed Container) |
| INFO - Configuring PersistenceUnit(name=movie-unit, provider=org.hibernate.ejb.HibernatePersistence) |
| INFO - Auto-creating a Resource with id 'movieDatabaseNonJta' of type 'DataSource for 'movie-unit'. |
| INFO - Configuring Service(id=movieDatabaseNonJta, type=Resource, provider-id=movieDatabase) |
| INFO - Adjusting PersistenceUnit movie-unit <non-jta-data-source> to Resource ID 'movieDatabaseNonJta' from 'movieDatabaseUnmanaged' |
| INFO - Enterprise application "/Users/dblevins/examples/jpa-hibernate" loaded. |
| INFO - Assembling app: /Users/dblevins/examples/jpa-hibernate |
| INFO - PersistenceUnit(name=movie-unit, provider=org.hibernate.ejb.HibernatePersistence) - provider time 631ms |
| INFO - Jndi(name="java:global/jpa-hibernate/Movies!org.superbiz.injection.h3jpa.Movies") |
| INFO - Jndi(name="java:global/jpa-hibernate/Movies") |
| INFO - Jndi(name="java:global/EjbModule1235930463/org.superbiz.injection.h3jpa.MoviesTest!org.superbiz.injection.h3jpa.MoviesTest") |
| INFO - Jndi(name="java:global/EjbModule1235930463/org.superbiz.injection.h3jpa.MoviesTest") |
| INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container) |
| INFO - Created Ejb(deployment-id=org.superbiz.injection.h3jpa.MoviesTest, ejb-name=org.superbiz.injection.h3jpa.MoviesTest, container=Default Managed Container) |
| INFO - Started Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container) |
| INFO - Started Ejb(deployment-id=org.superbiz.injection.h3jpa.MoviesTest, ejb-name=org.superbiz.injection.h3jpa.MoviesTest, container=Default Managed Container) |
| INFO - Deployed Application(path=/Users/dblevins/examples/jpa-hibernate) |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.22 sec |
| |
| Results : |
| |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre> |
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