Spring ORM tutorial avec JPA, Hibernate, Transactions

Dans ce tutorial ,nous allons montrer comment travailler avec Spring ORM ,JPA,hibernate.
Voici la structure de notre projet.

Fichier pom.xml

	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>spring.tx</groupId>
	<artifactId>spring-tx</artifactId>
	<version>1.0-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>spring-tx</name>
	<url>http://maven.apache.org</url>
	<properties>
	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	<spring.version>3.2.0.RELEASE</spring.version>
	<!-- JDK -->
	<maven.compiler.source>1.7</maven.compiler.source>
	<maven.compiler.target>1.7</maven.compiler.target>
	</properties>
	<dependencies>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-core</artifactId>
	<version>${spring.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context</artifactId>
	<version>${spring.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-tx</artifactId>
	<version>${spring.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-orm</artifactId>
	<version>${spring.version}</version>
	</dependency>
	<dependency>
	<groupId>commons-dbcp</groupId>
	<artifactId>commons-dbcp</artifactId>
	<version>1.2.2</version>
	</dependency>
	<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.26</version>
	</dependency>
	<dependency>
	<groupId>javax.persistence</groupId>
	<artifactId>persistence-api</artifactId>
	<version>1.0</version>
	</dependency>
	<dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-core</artifactId>
	<version>4.1.9.Final</version>
	</dependency>
	<dependency>
	<groupId>junit</groupId>
	<artifactId>junit</artifactId>
	<version>3.8.1</version>
	<scope>test</scope>
	</dependency>
	</dependencies>
	</project>

view raw pom.xml hosted with ❤ by GitHub

La classe User.java

	package com.formation.spring.tx.model;
	import javax.persistence.Column;
	import javax.persistence.Entity;
	import javax.persistence.GeneratedValue;
	import javax.persistence.GenerationType;
	import javax.persistence.Id;
	import javax.persistence.Table;
	@Entity
	@Table(name="USER")
	public class User {
	@Id
	@Column(name="ID", nullable = false)
	private int id;
	@Column(name="USERNAME", nullable = false)
	private String username;
	@Column(name="NAME", nullable = false)
	private String name;
	public int getId() {
	return id;
	}
	public void setId(int id) {
	this.id = id;
	}
	public String getUsername() {
	return username;
	}
	public void setUsername(String username) {
	this.username = username;
	}
	public String getName() {
	return name;
	}
	public void setName(String name) {
	this.name = name;
	}
	}

view raw User.java hosted with ❤ by GitHub

L'interface UserDAO.java

	package com.formation.spring.tx.dao;
	import com.formation.spring.tx.model.User;
	public interface UserDAO {
	void insertUser(User user);
	}

view raw UserDAO hosted with ❤ by GitHub

L'implementation de l'interface est la classe suivante:

	package com.formation.spring.tx.dao.impl;
	import org.hibernate.SessionFactory;
	import org.springframework.beans.factory.annotation.Autowired;
	import org.springframework.stereotype.Service;
	import org.springframework.transaction.annotation.Transactional;
	import com.formation.spring.tx.dao.UserDAO;
	import com.formation.spring.tx.model.User;
	@Service(value="userDAOImpl")
	@Transactional
	public class UserDAOImpl implements UserDAO {
	@Autowired
	private SessionFactory sessionFactory;
	public void insertUser(User user) {
	sessionFactory.getCurrentSession().save(user);
	}
	}

view raw UserDAOImpl.java hosted with ❤ by GitHub

La classe de test Main.java:

	package com.formation.spring.tx;
	import org.springframework.context.ApplicationContext;
	import org.springframework.context.support.ClassPathXmlApplicationContext;
	import com.formation.spring.tx.dao.impl.UserDAOImpl;
	import com.formation.spring.tx.model.User;
	public class Main
	{
	public static void main( String[] args )
	{
	ApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");
	UserDAOImpl testBean = (UserDAOImpl) ctx.getBean("userDAOImpl");
	User user = new User();
	user.setUsername("ramzi");
	user.setName("dridi");
	testBean.insertUser(user);
	}
	}

view raw Main.java hosted with ❤ by GitHub

L'annotation @Service permet de déclarer un bean de service, c'est à dire de la couche métier.L'annotation @Transactional peut être utilisée pour indiquer au conteneur les méthodes qui doivent s'exécuter dans un contexte transactionnel.
Et finalement voici le fichier de configuration:

	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-3.0.xsd
	http://www.springframework.org/schema/tx
	http://www.springframework.org/schema/tx/spring-tx.xsd">
	<tx:annotation-driven proxy-target-class="true"/>
	<context:component-scan
	base-package="com.formation.spring.tx.dao.impl" />
	<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >
	<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
	<property name="url" value="jdbc:mysql://localhost/test"/>
	<property name="username" value="root"/>
	<property name="password" value=""/>
	</bean>
	<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
	<property name="dataSource" ref="dataSource"></property>
	<property name="hibernateProperties">
	<props>
	<prop
	key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
	<prop key="hibernate.show_sql">true</prop>
	<prop key="hibernate.hbm2ddl.auto">update</prop>
	</props>
	</property>
	<property name="packagesToScan" value="com.formation.spring.tx.model" />
	</bean>
	<bean id="transactionManager"
	class="org.springframework.orm.hibernate4.HibernateTransactionManager">
	<property name="sessionFactory" ref="sessionFactory"/>
	</bean>
	</beans>

view raw spring.xml hosted with ❤ by GitHub