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package jpa.controllers;
import java.io.Serializable;
import javax.persistence.Query;
import javax.persistence.EntityNotFoundException;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import entity.Coursetag;
import entity.Tagrates;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import jpa.controllers.exceptions.NonexistentEntityException;
/**
*
* @author atap
*/
public class TagratesJpaController implements Serializable {
public TagratesJpaController(){
}
public TagratesJpaController(EntityManagerFactory emf) {
this.emf = emf;
}
private EntityManagerFactory emf = Persistence.createEntityManagerFactory("EducationXPU");
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(Tagrates tagrates) {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Coursetag courseTagId = tagrates.getCourseTagId();
if (courseTagId != null) {
courseTagId = em.getReference(courseTagId.getClass(), courseTagId.getId());
tagrates.setCourseTagId(courseTagId);
}
em.persist(tagrates);
if (courseTagId != null) {
courseTagId.getTagratesList().add(tagrates);
courseTagId = em.merge(courseTagId);
}
em.getTransaction().commit();
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(Tagrates tagrates) throws NonexistentEntityException, Exception {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Tagrates persistentTagrates = em.find(Tagrates.class, tagrates.getId());
Coursetag courseTagIdOld = persistentTagrates.getCourseTagId();
Coursetag courseTagIdNew = tagrates.getCourseTagId();
if (courseTagIdNew != null) {
courseTagIdNew = em.getReference(courseTagIdNew.getClass(), courseTagIdNew.getId());
tagrates.setCourseTagId(courseTagIdNew);
}
tagrates = em.merge(tagrates);
if (courseTagIdOld != null && !courseTagIdOld.equals(courseTagIdNew)) {
courseTagIdOld.getTagratesList().remove(tagrates);
courseTagIdOld = em.merge(courseTagIdOld);
}
if (courseTagIdNew != null && !courseTagIdNew.equals(courseTagIdOld)) {
courseTagIdNew.getTagratesList().add(tagrates);
courseTagIdNew = em.merge(courseTagIdNew);
}
em.getTransaction().commit();
} catch (Exception ex) {
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Integer id = tagrates.getId();
if (findTagrates(id) == null) {
throw new NonexistentEntityException("The tagrates with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void destroy(Integer id) throws NonexistentEntityException {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Tagrates tagrates;
try {
tagrates = em.getReference(Tagrates.class, id);
tagrates.getId();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The tagrates with id " + id + " no longer exists.", enfe);
}
Coursetag courseTagId = tagrates.getCourseTagId();
if (courseTagId != null) {
courseTagId.getTagratesList().remove(tagrates);
courseTagId = em.merge(courseTagId);
}
em.remove(tagrates);
em.getTransaction().commit();
} finally {
if (em != null) {
em.close();
}
}
}
public List<Tagrates> findTagratesEntities() {
return findTagratesEntities(true, -1, -1);
}
public List<Tagrates> findTagratesEntities(int maxResults, int firstResult) {
return findTagratesEntities(false, maxResults, firstResult);
}
private List<Tagrates> findTagratesEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Tagrates.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public Tagrates findTagrates(Integer id) {
EntityManager em = getEntityManager();
try {
return em.find(Tagrates.class, id);
} finally {
em.close();
}
}
public int getTagratesCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Tagrates> rt = cq.from(Tagrates.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}