Question

What is the best type for storing IP-addresses in a database using Hibernate?

I though Byte[] or String, but is there a better way, or what do you use?

 @Column(name = "range_from",  nullable = false)
 public Byte[] getRangeFrom() {
  return rangeFrom;
 }
 public void setRangeFrom(Byte[] rangeFrom) {
  this.rangeFrom = rangeFrom;
 }

Answer 1

I store it in a long, very fast for lookup. You can use the following functions for conversion.

public static string GetStandardIP(long numericIP)
{
    string w = Convert.ToString(Convert.ToInt64(numericIP / 16777216) % 256);
    string x = Convert.ToString(Convert.ToInt64(numericIP / 65536) % 256);
    string y = Convert.ToString(Convert.ToInt64(numericIP / 256) % 256);
    string z = Convert.ToString(Convert.ToInt64(numericIP) % 256);

    return w + "." + x + "." + y + "." + z;
}

And this one

public static long GetNumericIP(string standardIP)
{
    if (standardIP != null && standardIP != string.Empty)
    {
        string[] ipParts = standardIP.Split('.');
        long numericIP = 16777216 * Convert.ToInt64(ipParts[0]) + 65536 * Convert.ToInt64(ipParts[1]) + 256 * Convert.ToInt32(ipParts[2]) + Convert.ToInt32(ipParts[3]);

        return numericIP;
    }
    return 0;
}

You may want to improve them by doing checks on the parameters.