package ejava.projects.esales.jpa;
   
   import java.util.List;
   
   import javax.persistence.EntityManager;
   
   import ejava.projects.esales.bo.Account;
   import ejava.projects.esales.dao.AccountDAO;
   
  /**
   * This class provides a sparse example of a JPA DAO for the class project.
   * It is put in place here to demonstrate some of the end-to-end use cases,
   *
   */
  public class JPAAccountDAO implements AccountDAO {
  	private EntityManager em;
  	
  	public void setEntityManager(EntityManager em) {
  		this.em = em;
  	}
  
  	public void createAccount(Account account) {
          em.persist(account);
  	}
  
  	@SuppressWarnings("unchecked")
  	public List<Account> getAccounts(int index, int count) {
  	    return (List<Account>)em.createQuery("select a from Account a")
  	                             .setFirstResult(index)
  	                             .setMaxResults(count)
  	                             .getResultList();
  	}
  }