[tyler12]

pawn Код:

if(newstate == PLAYER_STATE_ONFOOT && oldstate == PLAYER_STATE_DRIVER)
{
    new query[512],vehicleid2;
    vehicleid2 = vSQLID[vehicleid]; // Wherever you store the SQL ID
    format(query,sizeof(query),"UPDATE `vehicles` SET `LastDriver` = '%s' WHERE `VehicleID` = '%d'",pName(playerid),vehicleid2);
    mysql_query(query);
    mysql_free_result();
}

You didn't wrap the value with apostrophes ( ' ) nor are you giving vehicleid2 an ID (0). This should work.