Getting Started with JPA

<?xml version="1.0" encoding="UTF-8"?>
<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.concretepage</groupId>
<artifactId>jpademo</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
    
  <hibernate.version>4.2.5.Final</hibernate.version>
    <mysql-connector.version>5.1.26</mysql-connector.version>
    <slf4j.version>1.7.5</slf4j.version>
    <log4j.version>1.7.5</log4j.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate.version}</version>
    </dependency>
    
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>${hibernate.version}</version>
    </dependency>

     <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql-connector.version}</version>
    </dependency>
  
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${log4j.version}</version>
    </dependency>
</dependencies>

</project>
 

mvn eclipse:eclipse
 

package com.concretepage.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="farmer")
public class Farmer {
	@Id
	@Column(name="id")
	private int id;
	@Column(name="name")
	private String name;
	@Column(name="village")
	
	private String village;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getVillage() {
		return village;
	}
	public void setVillage(String village) {
		this.village = village;
	}
}
 

<?xml version="1.0" encoding="UTF-8" ?>
<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="com.concretepage">
        <description>JPA Test</description>
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.concretepage.entity.Farmer</class> 
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>

            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/jpadb"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value=""/>
        </properties>
    </persistence-unit>
</persistence>
 

package com.concretepage;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import com.concretepage.entity.Farmer;
public class JPADemo {
 	private static final EntityManagerFactory emFactory;
	static {
		   emFactory = Persistence.createEntityManagerFactory("com.concretepage");
	}
	public static EntityManager getEntityManager(){
		return emFactory.createEntityManager();
	}
	public static void main(String[] args) {
		EntityManager em = getEntityManager();	
		em.getTransaction().begin();
		
		Farmer f = new Farmer();
		f.setId(1);
		f.setName("Ram");
		f.setVillage("Dhananjaypur");
		em.persist(f);
		
		em.getTransaction().commit();
		em.clear();
		System.out.println("Done");
	}
}