●プログラム・リスト●

package com.tuyano.libro.db;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Query;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {

    public static void main(String[] args) {
        ApplicationContext app = new ClassPathXmlApplicationContext("dbbean.xml");

        EntityManagerFactory factory = app.getBean(EntityManagerFactory.class);
        EntityManager manager = factory.createEntityManager();

        makeDummyData(manager);

        // get list
        Query query = manager.createQuery("from SampleEntity");
        List list = query.getResultList();
        printList(list);

        System.out.println("...ok.");
    }

    // create dummy entity data.
    public static void makeDummyData(EntityManager manager) {
        EntityTransaction transaction = manager.getTransaction();
        transaction.begin();
        manager.persist(new SampleEntity("tuyano", "syoda@tuyano.com"));
        manager.persist(new SampleEntity("hanako", "hanako@flower"));
        manager.persist(new SampleEntity("taro", "taro@yamada"));
        manager.persist(new SampleEntity("sachiko", "sachico@happy"));
        manager.flush();
        transaction.commit();
    }

    // print all entity.
    public static void printList(List list) {
        for (Object item : list) {
            System.out.println(item);
        }
    }
}