[TzAkS.]

GetLastLogin is not a function.Try something like

Код:

new pname[25];
new var[256];
new y,m,d,h,mi,s;
getdate(y,m,d);
gettime(h,mi,s);
GetPlayerName(playerid,pname,25);
format(var, 256, "UPDATE `YOUR TABLE` SET `lastOn`='%d/%d/%d %d:%d:%d' WHERE `name`='%s'",d,m,y,h,mi,s,pname);
mysql_query(var);

And then use it to OnPlayerConnect,same with IP you have the function to get player ip,GetPlayerIp(playerid)