persondaobean.java

Javabean的一个实例

package com.impl;

import java.util.List;

import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import com.bean.Person;
import com.dao.PersonDAO;

@Stateless
@Remote( { PersonDAO.class })
public class PersonDAOBean implements PersonDAO {
	@PersistenceContext(unitName = "EntityBeanPerson")
	protected EntityManager em;

	public void deletePerson(int id) {
		Person person = em.find(Person.class, id);
		if (person != null)
			em.remove(person);

		// TODO Auto-generated method stub

	}

	public Person getPerson(int id) {
		Person person = em.find(Person.class, id);

		// TODO Auto-generated method stub
		return person;
	}

	@SuppressWarnings("unchecked")
	public List<Person> getPersonList() {
		Query query = em
				.createQuery("select o from Person o order by o.id asc");
		return (List<Person>) query.getResultList();

		// TODO Auto-generated method stub
	}

	public void insertPerson(Person person) {
		em.persist(person);

		// TODO Auto-generated method stub

	}

	public void mergePerson(Person person) {
		em.merge(person);

		// TODO Auto-generated method stub

	}

	public void updateName(String name, int id) {
		Person person = em.find(Person.class, id);
		if (person != null)
			person.setName(name);
		// em.merge(person);
		// TODO Auto-generated method stub

	}

}