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• Multiple Audio listeners in Scene

  - by Kevin Jensen Petersen

  THIS IS UNITY Im trying to make a FPS game over networking, it works fine. But now, when im trying to implement sound, it won't work. My guess would be, to add a Audio listener to the prefab, that gets instansiated whenever a player connects to the server, however the problem about this is that each player's audiolistener have been switched out which the other player(s), so the AudioSource won't play at the player, but at someone else in the game. Any suggestions ?

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• Generic Repository with SQLite and SQL Compact Databases

  - by Andrew Petersen

  I am creating a project that has a mobile app (Xamarin.Android) using a SQLite database and a WPF application (Code First Entity Framework 5) using a SQL Compact database. This project will even eventually have a SQL Server database as well. Because of this I am trying to create a generic repository, so that I can pass in the correct context depending on which application is making the request. The issue I ran into is my DataContext for the SQL Compact database inherits from DbContext and the SQLite database inherits from SQLiteConnection. What is the best way to make this generic, so that it doesn't matter what kind of database is on the back end? This is what I have tried so far on the SQL Compact side: public interface IRepository<TEntity> { TEntity Add(TEntity entity); } public class Repository<TEntity, TContext> : IRepository<TEntity>, IDisposable where TEntity : class where TContext : DbContext { private readonly TContext _context; public Repository(DbContext dbContext) { _context = dbContext as TContext; } public virtual TEntity Add(TEntity entity) { return _context.Set<TEntity>().Add(entity); } } And on the SQLite side: public class ElverDatabase : SQLiteConnection { static readonly object Locker = new object(); public ElverDatabase(string path) : base(path) { CreateTable<Ticket>(); } public int Add<T>(T item) where T : IBusinessEntity { lock (Locker) { return Insert(item); } } }

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• can't spot the error. Trying to increment

  - by Kevin Jensen Petersen

  I really can't spot the error, or the misspelling. This script should increase the variable currentTime with 1 every second, as long as i am holding the Space button down. This is Unity C#. using UnityEngine; using System.Collections; public class GameTimer : MonoBehaviour { //Timer private bool isTimeDone; public GUIText counter; public int currentTime; private bool starting; //Each message will be shown random each 20 seconds. public string[] messages; public GUIText msg; //To check if this is the end private bool end; void Update () { counter.guiText.text = currentTime.ToString(); if(Input.GetKey(KeyCode.Space)) { if(starting == false) { starting = true; } if(end == false) { if(isTimeDone) { StartCoroutine(timer()); } } else { msg.guiText.text = "You think you can do better? Press 'R' to Try again!"; if(Input.GetKeyDown(KeyCode.R)) { Application.LoadLevel(Application.loadedLevel); } } } if(!Input.GetKey(KeyCode.Space) & starting) { end = true; } } IEnumerator timer() { isTimeDone = false; yield return new WaitForSeconds(1); currentTime++; isTimeDone = true; } }

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• Is SOAP Http POST more complicated than I thought

  - by Pete Petersen

  I'm currently writing a bit of code to send some xml data to a web service via HTTP POST. I thought this would be really simple and have written the following example code (C#) Console.WriteLine("Press enter to send data..."); while (Console.ReadLine() != "q") { HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(@"http://localhost:8888/"); Foo fooItem = new Foo { Member1 = "05", Member2 = "74455604", Member3 = "15101051", Member4 = 1, Member5 = "fsf", Member6 = 6.52, }; ASCIIEncoding encoding = new ASCIIEncoding(); string postData = fooItem.ToXml(); byte[] data = encoding.GetBytes(postData); httpWReq.Method = "POST"; httpWReq.ContentType = "application/xml"; httpWReq.ContentLength = data.Length; using (Stream stream = httpWReq.GetRequestStream()) { stream.Write(data, 0, data.Length); } HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse(); string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd(); Console.WriteLine("Received " + responseString); Console.WriteLine("Press enter to send data..."); } This is all I thought would be necessary, however I have now been given the details for the web service. This included some information which is unfarmiliar to me and I'm unsure whether I need to include it. The information I was sent was <url>http://sometext/soap/rpc</url> <namespace>http://sometext/a.services</namespace> <method>receiveInfo</method> <parm-id>xmldata</parm-id> (Input data) (Actual XML data as string) <parm-id>status</parm-id> (Output data) <userid>user</userid> <password>pass</password> <secure>false</secure> I guess this means I need to include a username and password somehow, but I'm not sure what the namespace or method fields are used for. Could anyone give me a hint? Sorry I've never used webservices before.

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• Get Array value by string of keys

  - by Esben Petersen

  Hello, i'm building a template engine for my next project, which is going great. It replaces {tag} with a corresponding value. But, i want {tag[0][key]} to be replaced as well. All i need to know is how to get the value, if i have the string representation of the array and key, like this: $arr = array( 0=>array( 'key'=>'value' ), 1=>array( 'key'=>'value2' ) ); $tag = 'arr[0][key]'; echo($$tag); This is a very simple version of the problem, i hope you understand it. Or else i would be happy to anwser any questions about it :) Thanks for any help in advantage

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• What would an Outlook 2007 macro to automate Paste Special - Unformatted Text look like?

  - by Gary Petersen

  I'd like to assign a macro in Outlook 2007 to a Toolbar button that would execute the equivalent of these clicks when there is formatted text in the Windows clipboard: Click the Paste icon by the bottom arrow Click the Paste Special link. Click the Unformatted Text link. I have similar macros in Excel 2007 and Word 2007 but haven't been able to get one to work in Outlook 2007 / VBA. What would the VBA code for such a macro be?

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• can't get data from database to dropdownlist in loginview

  - by Thomas Bøg Petersen

  I have this code on an aspx page. <asp:DropDownList runat="server" ID="ddlSize" CssClass="textbox" Width="100px"> <asp:ListItem Value="" Text="" /> <asp:ListItem Value="11" Text="11. Mands" /> <asp:ListItem Value="7" Text="7. Mands" /> <asp:ListItem Value="" Text="Ikke Kamp"/> </asp:DropDownList> <asp:DropDownList runat="server" ID="ddlType" CssClass="textbox" Width="100px"> <asp:ListItem Value="" Text="" /> <asp:ListItem Value="K" Text="Kamp" /> <asp:ListItem Value="T" Text="Træning" /> <asp:ListItem Value="E" Text="Aktivitet"/> </asp:DropDownList> ts inside a loginview with some other fields (textbox) Im trying to get a record id into the page so i can edit it, I have fix it with the Textbox and its working 100%, but i cant get the value from the database into the dropdownlist so it show that value as selected. I have tryed these 3 codes, but nothing is working fore the dropdownlist. // DataValueField Dim drop_obj As DropDownList = TryCast(LoginView2.FindControl("ddlSize"), DropDownList) drop_obj.DataValueField = dtEvents.Rows(0)("EventEventSize") Dim drop_obj2 As DropDownList = TryCast(LoginView2.FindControl("ddlType"), DropDownList) drop_obj2.DataValueField = dtEvents.Rows(0)("EventType") // SelectedIndex Dim drop_obj As DropDownList = TryCast(LoginView2.FindControl("ddlSize"), DropDownList) drop_obj.SelectedIndex = dtEvents.Rows(0)("EventEventSize") Dim drop_obj2 As DropDownList = TryCast(LoginView2.FindControl("ddlType"), DropDownList) drop_obj2.SelectedIndex = dtEvents.Rows(0)("EventType") // SelectedValue Dim drop_obj As DropDownList = TryCast(LoginView2.FindControl("ddlSize"), DropDownList) drop_obj.SelectedValue = dtEvents.Rows(0)("EventEventSize") Dim drop_obj2 As DropDownList = TryCast(LoginView2.FindControl("ddlType"), DropDownList) drop_obj2.SelectedValue = dtEvents.Rows(0)("EventType") Can someone plz. help !? I have values in the 2 dtEvents.Rows(0) i have checked that, with a debug and then step-into. and i get values like 7 or 11 and T or K.

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• Consuming Web Services requiring Authentication from behind Proxy server

  - by Jan Petersen

  Hi All, I've seen a number of post about Proxy Authentication, but none that seams to address this problem. I'm building a SharePoint Web Service consuming desktop application, using Java, JAX-WS in NetBeans. I have a working prototype, that can query the server for authentication mode, successfully authenticate and retrieve a list of web site. However, if I run the same app from a network that is behind a proxy server (the proxy does not require authentication), then I'm running into trouble. The normal -dhttp.proxyHost ... settings does not seam to help any. But I have found that by creating a ProxySelector class and setting it as default, I can regain access to the authentication web service, but I still can't retrieve the list of web sites from the SharePoint server. It's almost as if the authentication I provide is going to the proxy rather than the SharePoint server. Anyone have any experience on how to make this work? I have put the source text java class files of a demo app up, showing the issue at the following urls (it's a bit to long even in the short demo form to post here). link text When running the code from a network behind a proxy server, I successfully retrieve the Authentication mode from the server, but the request for the Web Site list generates an exception originating at: com.sun.xml.internal.ws.transport.http.client .HttpClientTransport.readResponseCodeAndMessage(HttpClientTransport.java:201) The output from the source when no proxy is on the network is listed below: Successfully retrieved the SharePoint WebService response for Authentication SharePoint authentication method is: WINDOWS Calling Web Service to retrieve list of web site. Web Service call response: -------------- XML START -------------- <Webs xmlns="http://schemas.microsoft.com/sharepoint/soap/"> <Web Title="Collaboration Lab" Url="http://host.domain.com/collaboration"/> <Web Title="Global Data Lists" Url="http://host.domain.com/global_data_lists"/> <Web Title="Landing" Url="http://host.domain.com/Landing"/> <Web Title="SharePoint HelpDesk" Url="http://host.domain.com/helpdesk"/> <Web Title="Program Management" Url="http://host.domain.com/programmanagement"/> <Web Title="Project Site" Url="http://host.domain.com/Project Site"/> <Web Title="SharePoint Administration Tools" Url="http://host.domain.com/admin"/> <Web Title="Space Management Project" Url="http://host.domain.com/spacemgmt"/> </Webs> -------------- XML END -------------- Br Jan

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• Consuming SharePoint Web Services fails when behind Proxy server

  - by Jan Petersen

  Hi All, I've seen a number of post about consuming Web Services from behind a proxy server, but none that seams to address this problem. I'm building a desktop application, using Java, JAX-WS in NetBeans. I have a working prototype, that can query the server for authentication mode, successfully authenticate and retrieve a list of web site. However, if I run the same app from a network that is behind a proxy server (the proxy does not require authentication), then I'm running into trouble. The normal -dhttp.proxyHost ... settings does not seam to help any. But I have found that by creating a ProxySelector class and setting it as default, I can regain access to the authentication web service, but I still can't retrieve the list of web sites from the SharePoint server. Anyone have any experience on how to make this work? I have put the source text java class files of a demo app up, showing the issue at the following urls (it's a bit to long even in the short demo form to post here). link text When running the code from a network behind a proxy server, I successfully retrieve the Authentication mode from the server, but the request for the Web Site list generates an exception originating at: com.sun.xml.internal.ws.transport.http.client .HttpClientTransport.readResponseCodeAndMessage(HttpClientTransport.java:201) The output from the source when no proxy is on the network is listed below: Successfully retrieved the SharePoint WebService response for Authentication SharePoint authentication method is: WINDOWS Calling Web Service to retrieve list of web site. Web Service call response: -------------- XML START -------------- <Webs xmlns="http://schemas.microsoft.com/sharepoint/soap/"> <Web Title="Collaboration Lab" Url="http://host.domain.com/collaboration"/> <Web Title="Global Data Lists" Url="http://host.domain.com/global_data_lists"/> <Web Title="Landing" Url="http://host.domain.com/Landing"/> <Web Title="SharePoint HelpDesk" Url="http://host.domain.com/helpdesk"/> <Web Title="Program Management" Url="http://host.domain.com/programmanagement"/> <Web Title="Project Site" Url="http://host.domain.com/Project Site"/> <Web Title="SharePoint Administration Tools" Url="http://host.domain.com/admin"/> <Web Title="Space Management Project" Url="http://host.domain.com/spacemgmt"/> </Webs> -------------- XML END -------------- Br Jan

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• How to use will_paginate with a nested resource in Rails?

  - by Sue Petersen

  I'm new to Rails, and I'm having major trouble getting will_paginate to work with a nested resource. I have two models, Statement and Invoice. will_paginate is working on Statement, but I can't get it to work on Invoice. I know I'd doing something silly, but I can't figure it out and the examples I've found on google won't work for me. statement.rb class Statement < ActiveRecord::Base has_many :invoices def self.search(search, page) paginate :per_page => 19, :page => page, :conditions => ['company like ?', "%#{search}%"], :order => 'date_due DESC, company, supplier' end end statements_controller.rb <irrelevant code clipped for readability> def index #taken from the RAILSCAST 51, will_paginate podcast @statements = Statement.search(params[:search], params[:page]) end I call this in the view like so, and it works: <%= will_paginate @statements %> But I can't figure out how to get it to work for Invoices: invoice.rb class Invoice < ActiveRecord::Base belongs_to :statement def self.search(search, page) paginate :per_page => 19, :page => page, :conditions => ['company like ?', "%#{search}%"], :order => 'employee' end end invoices_controller.rb class InvoicesController < ApplicationController before_filter :find_statement #TODO I can't get will_paginate to work w a nested resource def index #taken from the RAILSCAST 51, will_paginate podcast @invoices = Invoice.search(params[:search], params[:page]) end def find_statement @statement_id = params[:statement_id] return(redirect_to(statements_url)) unless @statement_id @statement = Statement.find(@statement_id) end end And I try to call it like this: <%= will_paginate (@invoices) % The most common error message, as I play with this, is: "The @statements variable appears to be empty. Did you forget to pass the collection object for will_paginate?" I don't have a clue what the problem is, or how to fix it. Thanks for any help and guidance!

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• NTLM Authentication fails when behind Proxy server

  - by Jan Petersen

  Hi All, I've seen a number of post about consuming Web Services from behind a proxy server, but none that seams to address this problem. I'm building a desktop application, using Java, JAX-WS in NetBeans. I have a working prototype, that can query the server for authentication mode, successfully authenticate and retrieve a list of web site. However, if I run the same app from a network that is behind a proxy server (the proxy does not require authentication), then I'm running into trouble. I have sniffed the traffic, and noticed the following: Behind Proxy # Result Protocol Host URL 1 200 HTTP host.domain.com /_vti_bin/Authentication.asmx 2 401 HTTP host.domain.com /_vti_bin/Webs.asmx 3 401 HTTP host.domain.com /_vti_bin/Webs.asmx 4 401 HTTP host.domain.com /_vti_bin/Webs.asmx 5 401 HTTP host.domain.com /_vti_bin/Webs.asmx Without Proxy # Result Protocol Host URL 1 200 HTTP host.domain.com /_vti_bin/Authentication.asmx 2 401 HTTP host.domain.com /_vti_bin/Webs.asmx 3 401 HTTP host.domain.com /_vti_bin/Webs.asmx 4 401 HTTP host.domain.com /_vti_bin/Webs.asmx 5 401 HTTP host.domain.com /_vti_bin/Webs.asmx 6 200 HTTP host.domain.com /_vti_bin/Webs.asmx When running the code from a network without a proxy server, I successfully Authentication with the server, but when I'm behind the proxy server, the traffic is cut-off at the 5th message, and thus don't succeed. I know from the Java docs that On Microsoft Windows platforms, NTLM authentication attempts to acquire the user credentials from the system without prompting the user's authenticator object. If these credentials are not accepted by the server then the user's authenticator will be called. Given that my Authentication code is called only ones, and only as the 5th attempt, it appears as if the connection is dropped when behind the proxy server before my Authentication object is used. Is there any way I can control the behavior of Authentication module, to not have it use the system credentials? I have put the source text java class files of a demo app up, showing the issue at the following urls (it's a bit to long even in the short demo form to post here). link text Br Jan

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• delete function and upload

  - by Jesper Petersen

  it must be said that I download the database and all my function is in class. That's how I was incredible pleased function and think they are nice .. That's how I'm going to build a gallery where the id of the upload to the site if it fits with the id_session is log in page, you have the option to delete it. and so it must just go back to / latest pictures / when it delete it from the folder and database. but it comes up with an error as you can see here; Fatal error: Call to a member function bind_param () on a non-object in / home / jesperbo / public_html / mebe.dk / function / function.php on line 411 It is such that I am also in the process of building an upload system where the underlying database and make it smaller after what I have now set it and when it did the 2 things must send me back to / latest-images / but it do not reach the only available picture up on the server and do it with the picture but it will not go back in some way at all. So to / latest-images / Where wrong with it to delete, etc. I lie just here, $stm1->bind_param('i', $id_gallery); function img_slet_indhold(){ if($_SESSION["logged_in"] = true && $_SESSION["rank"] == '1' || $_SESSION["rank"] == 2) { if($stmt = $this->mysqli->prepare('SELECT `title` FROM `gallery` WHERE `id_gallery` = ?')) { $stm1->bind_param('i', $id_gallery); $id_gallery = $_GET["id_gallery"]; $stm1->execute(); $stm1->store_result(); $stm1->bind_result($title); $UploadDir = "/gallery/"; //ligger i toppen af documentet, evt som en define if($stm1->fetch()) { $tmpfile = $UploadDir . "" . $title; if(file_exists($tmpfile)) { unlink($tmpfile); } $tmpfile = $UploadDir . "lille/" . $title; if(file_exists($tmpfile)) { unlink($tmpfile); } $tmpfile = $UploadDir . "store/" . $title; if(file_exists($tmpfile)) { unlink($tmpfile); } } $stm1->close(); } else { /* Der er opstået en fejl */ echo 'Der opstod en fejl i erklæringen: ' . $mysqli->error; } } if($stmt = $this->mysqli->prepare('DELETE FROM `gallery` WHERE `id_gallery` = ?' )) { $stmt->bind_param('i', $id); $id = $_GET["id_gallery"]; $stmt->execute(); header('Location: /nyeste-billeder/'); $stmt->close(); } else { /* Der er opstået en fejl */ echo 'Der opstod en fejl i erklæringen: ' . $mysqli->error; } } So into the file as it should delete from, I have chosen to do so here; <?php session_start(); require_once ("function/function.php"); $mebe = new mebe; $db = $mebe->db_c(); error_reporting(E_ERROR); $img_slet_indhold = $mebe->img_slet_indhold(); ?> So when I upload image to folder and database, and just after can be returned when uploading function img_indhold(){ if($_SESSION["logged_in"] = true && $_SESSION["rank"] == '1' || $_SESSION["rank"] == 2) { include "function/class.upload.php"; $handle = new Upload($_FILES["filename"]); if($handle->uploaded) { //lidt mere store billeder $handle->image_resize = true; $handle->image_ratio_y = true; $handle->image_x = 220; $handle->Process("gallery/store"); //til profil billede lign.. $handle->image_resize = true; $handle->image_ratio_crop = true; $handle->image_y = 115; $handle->image_x = 100; $handle->Process("gallery"); //til profil billede lign.. $handle->image_resize = true; $handle->image_ratio_crop = true; $handle->image_y = 75; $handle->image_x = 75; $handle->Process("gallery/lille"); $pb = $handle->file_dst_name; } if($stmt = $this->mysqli->prepare('INSERT INTO `gallery` (`title`, `id_bruger`) VALUES (?, ?)')) { $stmt->bind_param('si', $title, $id_bruger); $title = $pb; $id_bruger = $_SESSION["id"]; $stmt->execute(); header('Location: /nyeste-billeder/'); $stmt->close(); } } } So when I call it on the page when it is required to do so do it like this; <?php session_start(); require_once ("function/function.php"); $mebe = new mebe; $db = $mebe->db_c(); error_reporting(E_ERROR); $img_slet_indhold = $mebe->img_slet_indhold(); ?> it is here as to when I will upload to the site and show gallery / pictures on the page function vise_img(){ if ($stmt = $this->mysqli->prepare('SELECT `id_gallery`, `title`, `id_bruger` FROM `gallery` ORDER BY `gallery`.`id_gallery` DESC')) { $stmt->execute(); $stmt->store_result(); $stmt->bind_result($id_gallery, $title, $id_bruger); while ($stmt->fetch()) { echo "<div id=\"gallery_box\">"; echo "<a href=\"/profil/$id_bruger/\"><img src=\"/gallery/$title\" alt=\"\" height=\"115\" width=\"100\" border=\"0\"></a>"; if($_SESSION["logged_in"]) { if($id_bruger == $_SESSION["id"]) { echo "<ul>"; echo "<li><a href=\"/nyeste-billeder-slet/$id_gallery/\">Slet</a></li>"; echo "</ul>"; } } echo "</div>"; } /* Luk statement */ $stmt->close(); } else { /* Der er opstået en fejl */ echo 'Der opstod en fejl i erklæringen: ' . $mysqli->error; } } function upload_img(){ if($_SESSION["logged_in"] = true && $_SESSION["rank"] == '1' || $_SESSION["rank"] == 2) { ?> <form name="opslag" method="post" action="/nyeste-ok/" enctype="multipart/form-data"> <input type="file" name="filename" id="filename" onchange="checkFileExt(this)"> <input name="upload" value="Upload" id="background_indhold" onclick="return check()" type="submit"> </form> <?php } elseif ($_SESSION["logged_in"] != true && $_SESSION["rank"] != '1' || $_SESSION["rank"] != 2) { echo "<p>Du har ingen mulighed for at upload billeder på siden</p>"; } } Really hope you are able to help me further!

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• C# Sql Connection Best Practises 2013

  - by Pete Petersen

  With the new year approaching I'm drawing up a development plan for 2013. I won't bore you with the details but I started thinking about whether the way I do things is actually the 'correct' way. In particular how I'm interfacing with SQL. I create predominantly create WPF desktop applications and often some Silverlight Web Applications. All of my programs are very Data-Centric. When connecting to SQL from WPF I tend to use Stored Procedures stored on the server and fetch them using ADO.NET (e.g. SQLConnection(), .ExecuteQuery()). However with Silverlight I have a WCF service and use LINQ to SQL (and I'm using LINQ much more in WPF). My question is really is am I doing anything wrong in a sense that it's a little old fashioned? I've tried to look this up online but could find anything useful after about 2010 and of those half were 'LINQ is dead!' and the other 'Always use LINQ' Just want to make sure going forward I'm doing the right things the right way, or at least the advised way :). What principles are you using when connecting to SQL? Is it the same for WPF and Silverlight/WCF?

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• ASP.NET mvcConf Videos Available

  - by ScottGu

  Earlier this month the ASP.NET MVC developer community held the 2nd annual mvcConf event.  This was a free, online conference focused on ASP.NET MVC – with more than 27 talks that covered a wide variety of ASP.NET MVC topics.  Almost all of the talks were presented by developers within the community, and the quality and topic diversity of the talks was fantastic. Below are links to free recordings of the talks that you can watch (and optionally download): Scott Guthrie Keynote The NuGet-y Goodness of Delivering Packages (Phil Haack) Industrial Strenght NuGet (Andy Wahrenberger) Intro to MVC 3 (John Petersen) Advanced MVC 3 (Brad Wilson) Evolving Practices in Using jQuery and Ajax in ASP.NET MVC Applications (Eric Sowell) Web Matrix (Rob Conery) Improving ASP.NET MVC Application Performance (Steven Smith) Intro to Building Twilio Apps with ASP.NET MVC (John Sheehan) The Big Comparison of ASP.NET MVC View Engines (Shay Friedman) Writing BDD-style Tests for ASP.NET MVC using MSTestContrib (Mitch Denny) BDD in ASP.NET MVC using SpecFlow, WatiN and WatiN Test Helpers (Brandon Satrom) Going Postal - Generating email with View Engines (Andrew Davey) Take some REST with WCF (Glenn Block) MVC Q&A (Jeffrey Palermo) Deploy ASP.NET MVC with No Effort (Troels Thomsen) IIS Express (Vaidy Gopalakrishnan) Putting the V in MVC (Chris Bannon) CQRS and Event Sourcing with MVC 3 (Ashic Mahtab) MVC 3 Extensibility (Roberto Hernandez) MvcScaffolding (Steve Sanderson) Real World Application Development with Mvc3 NHibernate, FluentNHibernate and Castle Windsor (Chris Canal) Building composite web applications with Open frameworks (Sebastien Lambla) Quality Driven Web Acceptance Testing (Amir Barylko) ModelBinding derived types using the DerivedTypeModelBinder in MvcContrib (Steve Hebert) Entity Framework "Code First": Domain Driven CRUD (Chris Zavaleta) Wrap Up with Jon Galloway & Javier Lozano I’d like to say a huge thank you to all of the speakers who presented, and to Javier Lozano, Eric Hexter and Jon Galloway for all their hard work in organizing the event and making it happen. Hope this helps, Scott P.S. I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• ASMLib

  - by wcoekaer

  Oracle ASMlib on Linux has been a topic of discussion a number of times since it was released way back when in 2004. There is a lot of confusion around it and certainly a lot of misinformation out there for no good reason. Let me try to give a bit of history around Oracle ASMLib. Oracle ASMLib was introduced at the time Oracle released Oracle Database 10g R1. 10gR1 introduced a very cool important new features called Oracle ASM (Automatic Storage Management). A very simplistic description would be that this is a very sophisticated volume manager for Oracle data. Give your devices directly to the ASM instance and we manage the storage for you, clustered, highly available, redundant, performance, etc, etc... We recommend using Oracle ASM for all database deployments, single instance or clustered (RAC). The ASM instance manages the storage and every Oracle server process opens and operates on the storage devices like it would open and operate on regular datafiles or raw devices. So by default since 10gR1 up to today, we do not interact differently with ASM managed block devices than we did before with a datafile being mapped to a raw device. All of this is without ASMLib, so ignore that one for now. Standard Oracle on any platform that we support (Linux, Windows, Solaris, AIX, ...) does it the exact same way. You start an ASM instance, it handles storage management, all the database instances use and open that storage and read/write from/to it. There are no extra pieces of software needed, including on Linux. ASM is fully functional and selfcontained without any other components. In order for the admin to provide a raw device to ASM or to the database, it has to have persistent device naming. If you booted up a server where a raw disk was named /dev/sdf and you give it to ASM (or even just creating a tablespace without asm on that device with datafile '/dev/sdf') and next time you boot up and that device is now /dev/sdg, you end up with an error. Just like you can't just change datafile names, you can't change device filenames without telling the database, or ASM. persistent device naming on Linux, especially back in those days ways to say it bluntly, a nightmare. In fact there were a number of issues (dating back to 2004) : Linux async IO wasn't pretty persistent device naming including permissions (had to be owned by oracle and the dba group) was very, very difficult to manage system resource usage in terms of open file descriptors So given the above, we tried to find a way to make this easier on the admins, in many ways, similar to why we started working on OCFS a few years earlier - how can we make life easier for the admins on Linux. A feature of Oracle ASM is the ability for third parties to write an extension using what's called ASMLib. It is possible for any third party OS or storage vendor to write a library using a specific Oracle defined interface that gets used by the ASM instance and by the database instance when available. This interface offered 2 components : Define an IO interface - allow any IO to the devices to go through ASMLib Define device discovery - implement an external way of discovering, labeling devices to provide to ASM and the Oracle database instance This is similar to a library that a number of companies have implemented over many years called libODM (Oracle Disk Manager). ODM was specified many years before we introduced ASM and allowed third party vendors to implement their own IO routines so that the database would use this library if installed and make use of the library open/read/write/close,.. routines instead of the standard OS interfaces. PolyServe back in the day used this to optimize their storage solution, Veritas used (and I believe still uses) this for their filesystem. It basically allowed, in particular, filesystem vendors to write libraries that could optimize access to their storage or filesystem.. so ASMLib was not something new, it was basically based on the same model. You have libodm for just database access, you have libasm for asm/database access. Since this library interface existed, we decided to do a reference implementation on Linux. We wrote an ASMLib for Linux that could be used on any Linux platform and other vendors could see how this worked and potentially implement their own solution. As I mentioned earlier, ASMLib and ODMLib are libraries for third party extensions. ASMLib for Linux, since it was a reference implementation implemented both interfaces, the storage discovery part and the IO part. There are 2 components : Oracle ASMLib - the userspace library with config tools (a shared object and some scripts) oracleasm.ko - a kernel module that implements the asm device for /dev/oracleasm/* The userspace library is a binary-only module since it links with and contains Oracle header files but is generic, we only have one asm library for the various Linux platforms. This library is opened by Oracle ASM and by Oracle database processes and this library interacts with the OS through the asm device (/dev/asm). It can install on Oracle Linux, on SuSE SLES, on Red Hat RHEL,.. The library itself doesn't actually care much about the OS version, the kernel module and device cares. The support tools are simple scripts that allow the admin to label devices and scan for disks and devices. This way you can say create an ASM disk label foo on, currently /dev/sdf... So if /dev/sdf disappears and next time is /dev/sdg, we just scan for the label foo and we discover it as /dev/sdg and life goes on without any worry. Also, when the database needs access to the device, we don't have to worry about file permissions or anything it will be taken care of. So it's a convenience thing. The kernel module oracleasm.ko is a Linux kernel module/device driver. It implements a device /dev/oracleasm/* and any and all IO goes through ASMLib - /dev/oracleasm. This kernel module is obviously a very specific Oracle related device driver but it was released under the GPL v2 so anyone could easily build it for their Linux distribution kernels. Advantages for using ASMLib : A good async IO interface for the database, the entire IO interface is based on an optimal ASYNC model for performance A single file descriptor per Oracle process, not one per device or datafile per process reducing # of open filehandles overhead Device scanning and labeling built-in so you do not have to worry about messing with udev or devlabel, permissions or the likes which can be very complex and error prone. Just like with OCFS and OCFS2, each kernel version (major or minor) has to get a new version of the device drivers. We started out building the oracleasm kernel module rpms for many distributions, SLES (in fact in the early days still even for this thing called United Linux) and RHEL. The driver didn't make sense to get pushed into upstream Linux because it's unique and specific to the Oracle database. As it takes a huge effort in terms of build infrastructure and QA and release management to build kernel modules for every architecture, every linux distribution and every major and minor version we worked with the vendors to get them to add this tiny kernel module to their infrastructure. (60k source code file). The folks at SuSE understood this was good for them and their customers and us and added it to SLES. So every build coming from SuSE for SLES contains the oracleasm.ko module. We weren't as successful with other vendors so for quite some time we continued to build it for RHEL and of course as we introduced Oracle Linux end of 2006 also for Oracle Linux. With Oracle Linux it became easy for us because we just added the code to our build system and as we churned out Oracle Linux kernels whether it was for a public release or for customers that needed a one off fix where they also used asmlib, we didn't have to do any extra work it was just all nicely integrated. With the introduction of Oracle Linux's Unbreakable Enterprise Kernel and our interest in being able to exploit ASMLib more, we started working on a very exciting project called Data Integrity. Oracle (Martin Petersen in particular) worked for many years with the T10 standards committee and storage vendors and implemented Linux kernel support for DIF/DIX, data protection in the Linux kernel, note to those that wonder, yes it's all in mainline Linux and under the GPL. This basically gave us all the features in the Linux kernel to checksum a data block, send it to the storage adapter, which can then validate that block and checksum in firmware before it sends it over the wire to the storage array, which can then do another checksum and to the actual DISK which does a final validation before writing the block to the physical media. So what was missing was the ability for a userspace application (read: Oracle RDBMS) to write a block which then has a checksum and validation all the way down to the disk. application to disk. Because we have ASMLib we had an entry into the Linux kernel and Martin added support in ASMLib (kernel driver + userspace) for this functionality. Now, this is all based on relatively current Linux kernels, the oracleasm kernel module depends on the main kernel to have support for it so we can make use of it. Thanks to UEK and us having the ability to ship a more modern, current version of the Linux kernel we were able to introduce this feature into ASMLib for Linux from Oracle. This combined with the fact that we build the asm kernel module when we build every single UEK kernel allowed us to continue improving ASMLib and provide it to our customers. So today, we (Oracle) provide Oracle ASMLib for Oracle Linux and in particular on the Unbreakable Enterprise Kernel. We did the build/testing/delivery of ASMLib for RHEL until RHEL5 but since RHEL6 decided that it was too much effort for us to also maintain all the build and test environments for RHEL and we did not have the ability to use the latest kernel features to introduce the Data Integrity features and we didn't want to end up with multiple versions of asmlib as maintained by us. SuSE SLES still builds and comes with the oracleasm module and they do all the work and RHAT it certainly welcome to do the same. They don't have to rebuild the userspace library, it's really about the kernel module. And finally to re-iterate a few important things : Oracle ASM does not in any way require ASMLib to function completely. ASMlib is a small set of extensions, in particular to make device management easier but there are no extra features exposed through Oracle ASM with ASMLib enabled or disabled. Often customers confuse ASMLib with ASM. again, ASM exists on every Oracle supported OS and on every supported Linux OS, SLES, RHEL, OL withoutASMLib Oracle ASMLib userspace is available for OTN and the kernel module is shipped along with OL/UEK for every build and by SuSE for SLES for every of their builds ASMLib kernel module was built by us for RHEL4 and RHEL5 but we do not build it for RHEL6, nor for the OL6 RHCK kernel. Only for UEK ASMLib for Linux is/was a reference implementation for any third party vendor to be able to offer, if they want to, their own version for their own OS or storage ASMLib as provided by Oracle for Linux continues to be enhanced and evolve and for the kernel module we use UEK as the base OS kernel hope this helps.

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• Ruby number_to_currency displays a totally wrong number!

  - by SueP

  Greetings! I’m an old Delphi programmer making the leap to the Mac, Ruby, Rails, and web programming in general. I’m signed up for the Advanced Rails workshop at the end of the month. In the meantime, I’ve been working on porting a mission-critical (of course) app from Delphi to RAILS. It feels like I’ve spent most of the past year with my head buried in a book or podcast. Right now, I’ve hit a major issue and I’m tearing my hair out. I literally don’t know where to go with this, I desperately don’t want to deploy with this bug, and I’m feeling a bit frantic. (The company database is currently running on an ancient XP box that’s looking rustier by the day.) So, I set up a test database that shows the problem. I’m running: OS/X 10.6.3 Rails 2.3.5 ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0] MySQL 5.1.38-log via socket MySQL Client Version 5.1.8 ActiveRecord::Schema.define(:version => 20100406222528) do create_table “money”, :force => true do |t| t.decimal “amount_due”, :precision => 10, :scale => 2, :default => 0.0 t.decimal “balance”, :precision => 10, :scale => 2, :default => 0.0 t.text “memofield” t.datetime “created_at” t.datetime “updated_at” end The index view is right out of the generator, slightly modified to add the formatting that's breaking on me. Listing money <table> <tr> <th>Amount</th> <th>Amount to_s </th> <th>Balance to $</th> <th>Balance with_precision </th> <th>Memofield</th> </tr> <% @money.each do |money| %> <tr> <td><%=h money.amount_due %></td> <td><%=h money.amount_due.to_s(‘F’) %></td> <td><%=h number_to_currency(money.balance) %></td> <td><%=h number_with_precision(money.balance, :precision => 2) %></td> <td><%=h money.memofield %></td> <td><%= link_to ‘Show’, money %></td> <td><%= link_to ‘Edit’, edit_money_path(money) %></td> <td><%= link_to ‘Destroy’, money, :confirm => ‘Are you sure?’, :method => :delete %></td> </tr> *<% end %> *</table> <%= link_to ‘New money’, new_money_path %> This seemed to work pretty well. Then I started testing with production data and hit a major problem with number_to_currency. The number in the database is: 10542.28, I verified it with the MySQL Query Browser. RAILS will display this as 10542.28 unless I call number_to_currency, then that number is displayed as: $15422.80 The error seems to happen with any number between 10,000.00 and 10,999.99 So far, I haven’t seen it outside of that range, but I obviously haven’t tested everything. I guess my workaround is to remove number_to_currency, but that leaves the views looking really sloppy and unprofessional. The formatting is messed up, things don’t line up properly and I can’t force the display to 2 decimal places. I’m seriously hoping there is an easy fix for this. I can’t imagine this being a widespread problem. It would affect so many people that someone would have fixed it! But I don’t know where to go from here. I’d desperately like some help. (Later – number_with_precision fails the same way number_to_currency does.) Sue Petersen

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