country="India";
city ="Pune";
String str=String.format("INSERT INTO server_connections(account_id,ip_address,version,direct_port,local_ip_address,mac_address,country,city) VALUES(%1s,'%2s','%3s',%4s,'%5s','%6s','%7s','%8s')",1, "1.1.1.1","3.0.2.9",3478,"192.168.0.2","",country,city);

connection.prepareStatement("insert ... (account_id, ..., country, city) values (?, ..., ?, ?)") и далее statement.setLong(1, 1)

Connection hub_DB_Connection=null;

Class.forName("com.mysql.jdbc.Driver");

HUB_DB_URL= "jdbc:mysql://"+HUB_DB_HOST+"/"+HUB_DB_NAME+"?autoReconnect=true";
hub_DB_Connection = DriverManager.getConnection(HUB_DB_URL, HUB_USER_NAME, HUB_PASSWORD);
................................................


Statement command = hub_DB_Connection.createStatement();

command.нет_таких_методов

PreparedStatement cmd =(PreparedStatement) hub_DB_Connection.prepareStatement("", new String[] {"1"});
cmd.execute();

cmd =(PreparedStatement) hub_DB_Connection.prepareStatement("...", new String[] {"1"});

statement.setString(x, str);