public static void addPlayer(Integer value) {

                try {
                        PreparedStatement playersUpdate = con.prepareStatement("UPDATE tablename SET online=? WHERE players=?;");
			//^^This is you getting what your putting it into.
                        coinsUpdate.setInt(1, value); //Update it to what value you put in
                        coinsUpdate.executeUpdate(); //Execute all the updates.
                        coinsUpdate.close();
                } catch (SQLException e) {
                        e.printStackTrace(); //Should NEVER error unless the SQL database is offline & the server is online.
                }
        }
}