public List<Transaction> findTransactionByCustomer(
			Customer param_selectedCustomer) {

		List<Transaction> transactions = new ArrayList<Transaction>();
		String query = "SELECT * FROM transaction WHERE customerId=?";
		em = dbUtil.getEntityManager();
		Query q = em.createNativeQuery(query, Transaction.class);
		q.setParameter(1, param_selectedCustomer.getId());
		transactions = q.getResultList();
		return transactions;

	}