DAO.java
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package br.gov.ans.dao;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import javax.transaction.Transactional;
import org.hibernate.Transaction;
public class DAO<T> implements Serializable{
private static final long serialVersionUID = 1L;
private EntityManager em;
protected final Class<T> classe;
public DAO(Class<T> classe, EntityManager em){
this.classe = classe;
this.em = em;
}
@Transactional
public void persist(T t){
em.persist(t);
em.flush();
}
public void persistSemJTA(T t){
org.hibernate.Session session = (org.hibernate.Session) em.getDelegate();
Transaction transaction = session.getTransaction();
transaction.begin();
session.persist(t);
transaction.commit();
}
@Transactional
public void merge(T t){
em.merge(t);
}
@Transactional
public void remove(T t) {
em.remove(em.merge(t));
}
public T findById(Serializable id){
return (T)em.find(classe, id);
}
@Transactional
@SuppressWarnings({ "unchecked", "rawtypes" })
public Long count() {
CriteriaQuery criteria = em.getCriteriaBuilder().createQuery();
Root<T> root = criteria.from(classe);
criteria.select(em.getCriteriaBuilder().count(root));
javax.persistence.Query q = em.createQuery(criteria);
return (Long) q.getSingleResult();
}
@Transactional
@SuppressWarnings({ "unchecked", "rawtypes" })
public List<T> executeNamedQuery(String queryName, Map<String, Object> params){
Query query = em.createNamedQuery(queryName, classe);
if ((params != null) && (!params.isEmpty())) {
for (Map.Entry entry : params.entrySet()) {
query.setParameter((String) entry.getKey(),entry.getValue());
}
}
return query.getResultList();
}
@Transactional
@SuppressWarnings({ "rawtypes" })
public Query createNamedQuery(String queryName, Map<String, Object> params){
Query query = em.createNamedQuery(queryName, classe);
if ((params != null) && (!params.isEmpty())) {
for (Map.Entry entry : params.entrySet()) {
query.setParameter((String) entry.getKey(),entry.getValue());
}
}
return query;
}
@Transactional
@SuppressWarnings("unchecked")
public List<T> getPaginatedResultList(int first, int pageSize) {
Query query = em.createQuery("from " + classe.getName());
if (pageSize >= 0){
query.setMaxResults(pageSize);
}
if (first >= 0){
query.setFirstResult(first);
}
return query.getResultList();
}
}