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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 exemplo mostra a persistência, exclusão e a criação de uma query com JPA Hibernate.
A Java Persistence API (JPA) é uma especificação Java para acessar, persistir e gerenciar dados entre classes/objetos Java e um banco de dados relacional.</p>
</div>
<div class="paragraph">
<p>Para exemplificar o uso da JPA vamos persistir um objeto (Movie) no banco de dados.</p>
</div>
<div class="paragraph">
<p>Links para a documentação foram adicionados em partes chave do exemplo para o caso de duvidas e como forma de incentivar sua leitura em busca de detalhes.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_movie">Movie</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Aqui nós temos uma classe com alguns detalhes. Perceba a anotação
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/Entity.html">@Entity</a>
acima da declaração da classe, com ela estamos dizendo que esta classe é uma entidade (uma tabela no banco de dados). Nós ainda temos mais duas anotações acima do atributo id, uma delas é o
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/Id.html">@Id</a>,
ele indica que este atributo é o identificador da entidade e a outra anotação
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/GeneratedValue.html">@GeneratedValue</a>
indica que a geração desses identificadores unicos serão gerenciados pelo provedor da persistência.</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>Agora nós podemos notar duas coisas diferentes: a anotação
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/PersistenceContext.html">@PersistenceContext</a>
e a declaração de um
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/EntityManager.html">EntityManager</a>.
O
<a href="https://tomee.apache.org/tomee-8.0/javadoc/javax/persistence/EntityManager.html">EntityManager</a>
é uma interface com as principais funcionalidades do JPA como persist, remove, merge, find e outros&#8230;&#8203;
Nós anotamos o
<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), logo criaremos um persistence.xml para isso.</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&lt;Movie&gt; 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>Aqui nós definimos qual banco de dados vai gravar nossos filmes (Movie) e realizamos outras configurações como: definir uma unidade de persistência (persistence-unit) com o nome movie-unit, seguidos pela definição do provedor/implementação do JPA (no caso o hibernate) e definimos algumas properties para o hibernate:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;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"&gt;
&lt;persistence-unit name="movie-unit"&gt;
&lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt;
&lt;jta-data-source&gt;movieDatabase&lt;/jta-data-source&gt;
&lt;non-jta-data-source&gt;movieDatabaseUnmanaged&lt;/non-jta-data-source&gt;
&lt;properties&gt;
&lt;property name="hibernate.hbm2ddl.auto" value="create-drop"/&gt;
&lt;property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/&gt;
&lt;/properties&gt;
&lt;/persistence-unit&gt;
&lt;/persistence&gt;</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_moviestest">MoviesTest</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Agora vamos realizar um teste, persistindo três filmes, em seguida realizamos uma busca e por fim nós os deletamos.</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&lt;Movie&gt; 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>
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</div>
<h1 id="_executando" class="sect0">Executando</h1>
<div class="paragraph">
<p>Para executar o exemplo com o maven, acesse a pasta do projeto:</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>E execute:</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>Com isso teremos uma saida no terminal similar a esta:</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 &lt;non-jta-data-source&gt; 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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