private int getServiceNumber(String service) {
		int num = 0;
		try
		{
			stmt = conn.prepareStatement("SELECT idService FROM service_data WHERE ServiceDescription = ?");
			stmt.setString(1, service);
			ResultSet rs = stmt.executeQuery();
			if(rs.next()) {
				num = rs.getInt(1);
			}
		} catch (SQLException e)
		{
			e.printStackTrace();
		}
		return num;
	}