public boolean existContact(String contact) {
		try {
			connection.connect();
			connection.executeQuery(CHECK_CONTACT + "'" + contact + "'");
			return connection.next(); 
		} catch (Exception e) {
			System.out.println(e);
			System.out.println("Ocurrio un error al tratar de conectarse.");
		} finally {
			try {
				connection.close();
			} catch (UGDBDisconnectException e) {
				e.printStackTrace();
			}
		}
		return false;
	}