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Added Activity 16 Application - Unit 15
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‎Unit15-JPA/src/unit15/jpa/Actividad16_Aplicacion/Alumno.java

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package unit15.jpa.Actividad16_Aplicacion;
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import java.io.Serializable;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.OneToOne;
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@Entity
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public class Alumno implements Serializable {
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@Id
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private int num;
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private String nombre;
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private String tlf;
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@OneToOne(orphanRemoval = false)
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private Portatil portatil;
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public Alumno(int num, String nombre, String tlf, Portatil portatil) {
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this.num = num;
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this.nombre = nombre;
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this.tlf = tlf;
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this.portatil = portatil;
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}
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public Alumno() {
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}
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public int getNum() {
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return num;
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}
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public void setNum(int num) {
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this.num = num;
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}
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public String getNombre() {
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return nombre;
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}
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public void setNombre(String nombre) {
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this.nombre = nombre;
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}
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public String getTlf() {
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return tlf;
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}
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public void setTlf(String tlf) {
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this.tlf = tlf;
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}
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public Portatil getPortatil() {
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return portatil;
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}
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public void setPortatil(Portatil portatil) {
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this.portatil = portatil;
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}
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@Override
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public String toString() {
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return "Alumno{" + "num=" + num + ", nombre=" + nombre +
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", tlf=" + tlf + ", portatil=" + portatil + '}';
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}
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}

‎Unit15-JPA/src/unit15/jpa/Actividad16_Aplicacion/AlumnoDAO.java

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package unit15.jpa.Actividad16_Aplicacion;
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import unit15.jpa.Actividad07.exceptions.NonexistentEntityException;
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import unit15.jpa.Actividad07.exceptions.PreexistingEntityException;
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import java.io.Serializable;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.Query;
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import javax.persistence.EntityNotFoundException;
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import javax.persistence.criteria.CriteriaQuery;
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import javax.persistence.criteria.Root;
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public class AlumnoDAO implements Serializable {
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public AlumnoDAO(EntityManagerFactory emf) {
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this.emf = emf;
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}
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private EntityManagerFactory emf = null;
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public EntityManager getEntityManager() {
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return emf.createEntityManager();
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}
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public void create(Alumno alumno) throws PreexistingEntityException, Exception {
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EntityManager em = null;
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try {
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em = getEntityManager();
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em.getTransaction().begin();
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Portatil portatil = alumno.getPortatil();
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if (portatil != null) {
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portatil = em.getReference(portatil.getClass(), portatil.getId());
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alumno.setPortatil(portatil);
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}
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em.persist(alumno);
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if (portatil != null) {
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Alumno oldAlumnoOfPortatil = portatil.getAlumno();
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if (oldAlumnoOfPortatil != null) {
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oldAlumnoOfPortatil.setPortatil(null);
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oldAlumnoOfPortatil = em.merge(oldAlumnoOfPortatil);
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}
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portatil.setAlumno(alumno);
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portatil = em.merge(portatil);
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}
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em.getTransaction().commit();
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} catch (Exception ex) {
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if (findAlumno(alumno.getNum()) != null) {
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throw new PreexistingEntityException("Alumno " + alumno + " already exists.", ex);
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}
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throw ex;
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} finally {
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if (em != null) {
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em.close();
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}
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}
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}
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public void edit(Alumno alumno) throws NonexistentEntityException, Exception {
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EntityManager em = null;
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try {
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em = getEntityManager();
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em.getTransaction().begin();
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Alumno persistentAlumno = em.find(Alumno.class, alumno.getNum());
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Portatil portatilOld = persistentAlumno.getPortatil();
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Portatil portatilNew = alumno.getPortatil();
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if (portatilNew != null) {
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portatilNew = em.getReference(portatilNew.getClass(), portatilNew.getId());
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alumno.setPortatil(portatilNew);
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}
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alumno = em.merge(alumno);
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if (portatilOld != null && !portatilOld.equals(portatilNew)) {
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portatilOld.setAlumno(null);
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portatilOld = em.merge(portatilOld);
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}
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if (portatilNew != null && !portatilNew.equals(portatilOld)) {
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Alumno oldAlumnoOfPortatil = portatilNew.getAlumno();
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if (oldAlumnoOfPortatil != null) {
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oldAlumnoOfPortatil.setPortatil(null);
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oldAlumnoOfPortatil = em.merge(oldAlumnoOfPortatil);
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}
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portatilNew.setAlumno(alumno);
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portatilNew = em.merge(portatilNew);
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}
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em.getTransaction().commit();
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} catch (Exception ex) {
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String msg = ex.getLocalizedMessage();
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if (msg == null || msg.length() == 0) {
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int id = alumno.getNum();
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if (findAlumno(id) == null) {
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throw new NonexistentEntityException("The alumno with id " + id + " no longer exists.");
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}
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}
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throw ex;
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} finally {
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if (em != null) {
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em.close();
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}
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}
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}
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public void destroy(int id) throws NonexistentEntityException {
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EntityManager em = null;
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try {
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em = getEntityManager();
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em.getTransaction().begin();
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Alumno alumno;
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try {
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alumno = em.getReference(Alumno.class, id);
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alumno.getNum();
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} catch (EntityNotFoundException enfe) {
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throw new NonexistentEntityException("The alumno with id " + id + " no longer exists.", enfe);
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}
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Portatil portatil = alumno.getPortatil();
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if (portatil != null) {
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portatil.setAlumno(null);
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portatil = em.merge(portatil);
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}
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em.remove(alumno);
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em.getTransaction().commit();
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} finally {
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if (em != null) {
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em.close();
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}
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}
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}
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public List<Alumno> findAlumnoEntities() {
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return findAlumnoEntities(true, -1, -1);
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}
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public List<Alumno> findAlumnoEntities(int maxResults, int firstResult) {
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return findAlumnoEntities(false, maxResults, firstResult);
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}
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private List<Alumno> findAlumnoEntities(boolean all, int maxResults, int firstResult) {
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EntityManager em = getEntityManager();
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try {
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CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
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cq.select(cq.from(Alumno.class));
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Query q = em.createQuery(cq);
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if (!all) {
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q.setMaxResults(maxResults);
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q.setFirstResult(firstResult);
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}
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return q.getResultList();
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} finally {
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em.close();
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}
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}
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public Alumno findAlumno(int id) {
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EntityManager em = getEntityManager();
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try {
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return em.find(Alumno.class, id);
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} finally {
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em.close();
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}
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}
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public int getAlumnoCount() {
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EntityManager em = getEntityManager();
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try {
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CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
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Root<Alumno> rt = cq.from(Alumno.class);
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cq.select(em.getCriteriaBuilder().count(rt));
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Query q = em.createQuery(cq);
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return ((Long) q.getSingleResult()).intValue();
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} finally {
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em.close();
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}
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}
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}

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