Persistence.xml

Este arquivo define as configurações usadas pelo Hibernate, tais como tipo do banco de dados, usuário e password.

<persistence 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_2_0.xsd"
	version="2.0">
 
	<persistence-unit name="databasePU" transaction-type="RESOURCE_LOCAL">
 
		<!-- provedor/implementacao do JPA -->
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<properties>
			<!-- com essa propriedade nao eh necessario mapear cada classe, o hibernate descobre automaticamente 
			todas aquelas que possuem anotacoes -->
			<property name="hibernate.archive.autodetection" value="class"/>
 
			<!-- dados da conexao -->
			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/databaseName?createDatabaseIfNotExist=true" />
			<property name="javax.persistence.jdbc.user" value="root" />
			<property name="javax.persistence.jdbc.password" value="bancodedados" />
 
			<!-- propriedades do hibernate -->
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
			<property name="hibernate.show_sql" value="true" />
			<property name="hibernate.format_sql" value="true" />
 
			<!-- atualiza o banco, gera as tabelas se for preciso -->
			<property name="hibernate.hbm2ddl.auto" value="update" />
 
		</properties>
	</persistence-unit>
</persistence>