[SaltySandy]

Try using a new SQL plugin. Also.. Perhaps use the function GetPlayerIp:

PHP код:

public OnPlayerConnect(playerid)
{
    new plrIP[16];
    GetPlayerIp(playerid, plrIP, sizeof(plrIP));
    if(!strcmp(plrIP, "127.0.0.1"))
    SendClientMessage(playerid, 0xFFFFFFFF, "Welcome to your server, master :)");
    return 1;
} 


Source: wiki.

Try that to get the IP, and after that store it into the database.