How to use Hibernate JPA in a simple Application

Background

This article demonstrates how to use Hibernate Entity Manager 4.3.7 in a simple application.

Software Environment

Windows 7 Professional SP1
Eclipse – Kepler Release
Java 1.7 (1.7.0_67 – Windows x86)
MySQL 5.6.16 – Community Server (GPL)
MySQL Java Connector 5.1.34
Hibernate 4.3.7 (Entity Manager)

Create a Maven Project

First, create a maven project. You may follow the steps to do so in this article How to create Maven project in Eclipse.

Create a MySQL Database

Run the following DDL to create against an existing MySQL database. In this article, the database schema is named “turretadb.”

CREATE TABLE IF NOT EXISTS Student(
  id int(11) NOT NULL AUTO_INCREMENT,
  lastname varchar(30) NOT NULL,
  firstname varchar(30) NOT NULL,
  middlename varchar(30) NOT NULL,
  version int(11) NULL,
  PRIMARY KEY (id)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS Student(

id int(11) NOT NULL AUTO_INCREMENT,

lastname varchar(30) NOT NULL,

firstname varchar(30) NOT NULL,

middlename varchar(30) NOT NULL,

version int(11) NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB;

Maven pom.xml Dependencies

Add the following dependencies in your 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>com.turreta.jpa.hibernate</groupId>
	<artifactId>TurretaJPAHibernate</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<dependencies>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-entitymanager</artifactId>
			<version>4.3.7.Final</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.34</version>
		</dependency>
	</dependencies>
</project>

<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">

<groupId>com.turreta.jpa.hibernate</groupId>

<artifactId>TurretaJPAHibernate</artifactId>

<version>0.0.1-SNAPSHOT</version>

<groupId>org.hibernate</groupId>

<artifactId>hibernate-entitymanager</artifactId>

<version>4.3.7.Final</version>

</dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

</dependency>

</dependencies>

</project>

The persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
	version="2.0">
	<persistence-unit name="jpahibernate"
		transaction-type="RESOURCE_LOCAL">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<class>com.turreta.jpa.hibernate.entities.Student</class>
		<properties>
			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jpahibernate" />
			<property name="javax.persistence.jdbc.user" value="root" />
			<property name="javax.persistence.jdbc.password" value="karlsangabriel" />
			<property name="hibernate.show_sql" value="true" />
		</properties>
	</persistence-unit>
</persistence>

<persistence xmlns="http://java.sun.com/xml/ns/persistence"

version="2.0">

<persistence-unit name="jpahibernate"

transaction-type="RESOURCE_LOCAL">

<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

<class>com.turreta.jpa.hibernate.entities.Student</class>

</properties>

</persistence-unit>

</persistence>

Sample JPA Application

package com.turreta.jpa.hibernate;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import com.turreta.jpa.hibernate.entities.Student;

public class MainClass {
	public static void main(String[] args) {
		EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpahibernate");
		EntityManager em = emf.createEntityManager();
		em.getTransaction().begin();
		
		Student student = new Student();
		student.setLastName("SGl");
		student.setMiddleName("M");
		student.setFirstName("KL");		
		
		em.getTransaction().commit();
		em.close();
		emf.close();
	}
}