UpdateVar using this include

[Matei02Mihai]

Hello. I want to make something like this with this include:

function UpdateVar( playerid, varname[ ], varnameingame ) {
if(playerid == INVALID_PLAYER_ID) return 1;
gString[ 0 ] = (EOS);
mysql_format( SQL, gString, sizeof gString, "UPDATE users SET %s = '%d' WHERE ID = '%d'", varname, varnameingame, PlayerInfo[ playerid ][ pSQLID ] );
mysql_tquery( SQL, gString, "", "" );
return 1;
}

Is possible? And how? I tried already to make it, but no result.