Database conversion

[netsoundrad]

Hey Folks;

for my travian-projekt i have this problem :

function get_user($spalte,$userid) { // Userdaten holen 
$sql ='SELECT '.$spalte.' FROM player_key_users where key_usr_id=\''.$userid.'\'';  
$result = mysql_query($sql) OR die(mysql_error());    
$user = mysql_fetch_assoc($result); 
return $user;
}  

function update_user($updatewerte, $userid) { 
	
$update = 'UPDATE player_key_users SET '.$updatewerte.' WHERE key_usr_id=\''.$userid.'\'';
$updatetrue=mysql_query($update);	

return $updatetrue;

What must i change that it will goes with the databasestructure from travian?
I use google, but i found nothing that helps me and i'm not firm enough in mysql :mellow:

please help as fast as possible

best wishes
Ralf