public OnPlayerRequestClass(playerid, classid)
{	
	// Check if the name is on our database
	// If it is -> Show login dialog
	// If not -> Tell client to register on site + kick
	if (!NameCheck(playerid)) return KickPlayer(playerid, "This name is not on our Database. Please register on our website: custom-roleplay.com");
	return 1;
}

public NameCheck(playerid) {
	new name[MAX_PLAYER_NAME + 1];
	GetPlayerName(playerid, name, sizeof(name));
	new query[128];
	mysql_format(Database, query, sizeof query, "SELECT * FROM users WHERE name = '%s'", name);
	mysql_query(Database, query);
	if (cache_num_rows() > 0) {
		return true;
	}
	return false;
}

public OnPlayerRequestClass(playerid, classid)
{
    new name[MAX_PLAYER_NAME + 1];
	GetPlayerName(playerid, name, sizeof(name));
	new query[128];
	mysql_format(Database, query, sizeof query, "SELECT * FROM users WHERE name = '%s'", name);
	mysql_tquery(Database, query, "OnPlayerNameCheck", "i", playerid);
	return 1;
}

forward public OnPlayerNameCheck(playerid);
public OnPlayerNameCheck(playerid)
{
	if(cache_num_rows() > 0)
	{
		ShowPlayerCharacterSleection or whatever();
		// name exist
	}
	else
	{
	    SendClientMessage(playerid, color_red, "this account doesnt exist....");
	    // name doesnt exist
  	}
	return 1;
}