Address Book Using JPA +ZK + Spring.

CRUDDaoImpl.java

package addressbook.dao;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

import org.springframework.stereotype.Repository;

@Repository
public class CRUDDaoImpl implements CRUDDao {

  @PersistenceContext(type = PersistenceContextType.EXTENDED)
	private EntityManager em;

	public EntityManager getEm() {
		return em;
	}

	public void setEm(EntityManager em) {
		this.em = em;
	}

	@SuppressWarnings("unchecked")
	public <T> List<T> getAll(Class<T> klass) {
		return em.createQuery("Select t from " + klass.getSimpleName() + " t")
				.getResultList();
	}

	public <T> T save(T t) {
		T newRecord = null;
		newRecord = em.merge(t);
		return newRecord;
	}

	public <T> void delete(T t) {
		em.remove(em.merge(t));
		em.flush();
	}
}