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Articles indexed Thursday March 18 2010

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• Calling Oracle Function with "complex" return value from C#

  - by devdimi

  I have an Oracle function returning record defined in the package, so one can do: select a,b,c FROM my_function(...); Calling this oracle function from .NET is as simple as executing normal sql query. Unfortunately the function has to do updates now and when it is called like this Oracle complains that updates are not allowed within selects and that makes sense. So now I am left with the choice to change the function call or to split the function. Basically I have to get rid of the select in the function call and need something like this in C#: EXEC :var:= my_func(...); where the type of var is custom tuple defined in the package. I have already tried using ParameterDirection.ReturnValue without success. Does anyone have an idea?

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• Using Cases to change background colour | Visual Studio 2008

  - by Simon

  I really need help working with cases, I'm only learning it so far, but just can't get a drop down menu to work that would change the background of a Textbox. Private Sub cbColours_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbColours.SelectedIndexChanged Select Case colours Case Is = "Red" txtSpace.BackColor = Color.Red Case Is = "Blue" txtSpace.BackColor = Color.Blue Case Is = "Green" txtSpace.BackColor = Color.Green End Select End Sub It isn't doing anything at all... In the dropdown menu, it has Red, Blue and Green one per line When the value (e.g. Green) is clicked, it will then change the Textbox to the colour selected. Many help appreciated :)

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• having trouble disabling textbox in vb.net

  - by user225269

  How do I disable a textbox the second time? here is my code, In form load the textbox is disabled, unless the user will input an idnumber that is in the database. But what if the user will input an idnumber that is in the database then, input again another that is not, That is where this code comes in, but it has problems, it doesnt disable the textbox in the event of a mouse click, what would be the proper way of doing this? Private Sub Button12_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button12.MouseClick Dim NoAcc As String Dim NoAccmod2 As String Dim NoPas As String Dim sqlcon As New MySqlConnection("Server=localhost; Database=school;Uid=root;Pwd=nitoryolai123$%^;") Dim sqlcom As MySqlCommand = New MySqlCommand("Select * from student where IDNO= '" & TextBox14.Text & "' ", sqlcon) sqlcon.Open() Dim rdr As MySqlDataReader rdr = sqlcom.ExecuteReader If rdr.HasRows Then rdr.Read() NoAcc = rdr("IDNO") If (TextBox14.Text <> NoAcc) Then MsgBox("ID Number is not yet registered!, please register first in the general information before trying to register parents information", MsgBoxStyle.Information) TextBox7.Enabled = False TextBox8.Enabled = False TextBox9.Enabled = False TextBox10.Enabled = False TextBox11.Enabled = False TextBox12.Enabled = False TextBox13.Enabled = False End If End If

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• NUnit GUI Runner and Apartment State

  - by tyndall

  how do you set the apartment state in the NUnit GUI runner? I'm trying to run a single NUnit test with WatiN and I'm getting the message. MyNamespace.LoginTests.CanLogin: System.Threading.ThreadStateException : The CurrentThread needs to have it's ApartmentState set to ApartmentState.STA to be able to automate Internet Explorer.

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• Huge EAR deployment

  - by bozo

  Hello all, I'm trying to figure out how to deploy a huge (40-50 MB) EAR file to the server through a rather slow VPN connection. The EAR contains EJB and WAR projects created in Glassfish, and 90% of the file size is from external dependency libraries used. Has anyone came up with a strategy for elegant deployment to production system from Netbeans, where the deployment (over the network) is done only for what is really needed (i.e. just one WAR, not the entire EAR, or just one lib, not the entire libraries subproject). Related to the first point, how to separate external dependency libs from project in Netbeans, so that the project compiles on development machine, but when the EAR/WAR/EJB is created it does not contain all the dependency JARs, which are making it huge. Perhaps we need to write custom ant script? Start using maven? Thank you all for kind answers, Bozo

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• How could I pass the type using Variables to the generic method???

  - by Sam Zhou

  Hi All, I have a generic method in c#: public IList<T> getList<T>(); When I call it as the way below? ... Type T1=metadata.ModelType; getList<T1>(); ... I got error in compiling. How could I do for it? I really need to pass the type as Variables to the generic method!

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• Why use wmode at all?

  - by Captain Phoenix

  What benefit does using wmode give if you're not needing transparency? I've look through this forum and found posts talking about the different wmode attributes here, but I want to know why I need to use it in the first place and if removing it will break anything else. My application uses wmode="opaque" at the moment but it seems to stop scrolling in Firefox. I use JavaScript focus() to allow the user to type directly into the flash ap. Otherwise I'm using the stock standard Flex Builder 3 HTML template. Edit: The ap uses the whole page, without any additional elements needing to be displayed over the flash part.

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• Articles about replication schemes/algorithms?

  - by jkff

  I'm designing an hierarchical distributed system (every node has zero or more "master" nodes to which it propagates its current data). The data gets continuously updated and I'd like to guarantee that at least N nodes have almost-current data at any given time. I do not need complete consistency, only eventual consistency (t.i. for any time instant, the current snapshot of data should eventually appear on at least N nodes. It is tricky to define the term "current" here, but still). Nodes may fail and go back up at any moment, and there is no single "central" node. O overflowers! Point me to some good papers describing replication schemes. I've so far found one: Consistency Management in Optimistic Replication Algorithms

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• While porting a windows application to web, is it better to stick to conventional web technologies o

  - by Kabeer

  Hello. The web based application I am working on currently is a port from a windows application. This application is very data intensive. There are scores of modules and each of these modules have number of forms (data entry screens) and reports whereas the forms have many many fields and likewise the reports. I have been trying to identify the most suitable architecture for the presentation tier. There are many functions that are not very easily portable, for example printing (this too is very complex). For most of the others, I am planning to us "Ext JS" library which looks like capable of handling about 70% of complexity out of the box while for the remaining I would be custom coding or extending Ext JS. Having said that (sorry for being so descriptive), I wonder, if this is an Intranet application, why not port the entire application to SilverLight? While I am good at .Net, I'm somewhat alien to SilverLight. Considering I know my target audience and that the software will be used per seat license, would it be better to ride on SilverLight or is it better to stick to conventional web (XHTML, JS, CSS, etc)? Further, I have to support multiple devices in future and considering that SilverLight plug-ins for many devices are yet not out, would it be a risk?

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• How to implement Master-Detail with Multi-Selection in WPF?

  - by gehho

  Hi, I plan to create a typical Master-Detail scenario, i.e. a collection of items displayed in a ListView via DataBinding to an ICollectionView, and details about the selected item in a separate group of controls (TextBoxes, NumUpDowns...). No problem so far, actually I have already implemented a pretty similar scenario in an older project. However, it should be possible to select multiple items in the ListView and get the appropriate shared values displayed in the detail view. This means, if all selected items have the same value for a property, this value should be displayed in the detail view. If they do not share the same value, the corresponding control should provide some visual clue for the user indicating this, and no value should be displayed (or an "undefined" state in a CheckBox for example). Now, if the user edits the value, this change should be applied to all selected items. Further requirements are: MVVM compatibility (i.e. not too much code-behind) Extendability (new properties/types can be added later on) Does anyone have experience with such a scenario? Actually, I think this should be a very common scenario. However, I could not find any details on that topic anywhere. Thanks! gehho. PS: In the older project mentioned above, I had a solution using a subclass of the ViewModel which handles the special case of multi-selection. It checked all selected items for equality and returned the appropriate values. However, this approach had some drawbacks and somehow seemed like a hack because (besides other smelly things) it was necessary to break the synchronization between the ListView and the detail view and handle it manually.

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• Process in updating my app in the market

  - by Sukitha

  Hi, i have released a version 1 on some app in the market. Can anyone tell me how to give an update of it? thanks

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• [C] converting Bit Field to int

  - by shaharg

  Hi, I have bit field declared this way: typedef struct morder { unsigned int targetRegister : 3; unsigned int targetMethodOfAddressing : 3; unsigned int originRegister : 3; unsigned int originMethodOfAddressing : 3; unsigned int oCode : 4; } bitset; I also have int array, and i want to get int value from this array, that represents the actual value of this bit field (which is actually some kind of machine word that i have the parts of it, and i want the int representation of the whole word). Thanks a lot.

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• How do you build an Oa_zones array in to utitlize OpenX full page invocation in Rails?

  - by johnml

  I'm serving ads using OpenX within Rails. To correctly use the OpenX full page invocation you need to set Oa_zones[] array, otherwise all available ads are requested (but will never be used). These are the necessary pieces: Build an array of zones. Ideally zones could be added in any partial, so working with this array needs to be accessible throughout the view. Output full page invocation link ie. delivery/spcjs.php?id=1&block=1 Output zones The problem is, the full page invocation script can't be loaded until the zone array is built (and instantiated in JavaScript). At the same time, the zone array can't be built until the entire view has been rendered.

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• How to rename model

  - by samuil

  I made a mistake early in development, and named one of my models with plural noun (Users instead of User). Is there an easy way to rename it and corresponding controller (similar to generating it with script/generate way)?

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• Using git-svn with existing svn project

  - by rogeriopvl

  I'm currently working on a project that has a svn repository. I'm used to git and love the way it allows me to have a local repository, so I would like to use git-svn with this project. I would like to know how to use git-svn from a svn project already in my computer. Do I really need to make a clone and start from there? Or can I just do something like git svn init in the current project folder and proceed from there? Also I would like to know about any big issues using git-svn, since this is a serious project and I shouldn't mess around with the repo. Thanks in advance.

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• How to resolve symbolic links in a shell script

  - by Greg Hewgill

  Given an absolute or relative path (in a Unix-like system), I would like to determine the full path of the target after resolving any intermediate symlinks. Bonus points for also resolving ~username notation at the same time. If the target is a directory, it might be possible to chdir() into the directory and then call getcwd(), but I really want to do this from a shell script rather than writing a C helper. Unfortunately, shells have a tendency to try to hide the existence of symlinks from the user (this is bash on OS X): $ ls -ld foo bar drwxr-xr-x 2 greg greg 68 Aug 11 22:36 bar lrwxr-xr-x 1 greg greg 3 Aug 11 22:36 foo -> bar $ cd foo $ pwd /Users/greg/tmp/foo $ What I want is a function resolve() such that when executed from the tmp directory in the above example, resolve("foo") == "/Users/greg/tmp/bar".

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• Worse is better. Is there an example?

  - by J.F. Sebastian

  Is there a widely-used algorithm that has time complexity worse than that of another known algorithm but it is a better choice in all practical situations (worse complexity but better otherwise)? An acceptable answer might be in a form: There are algorithms A and B that have O(N**2) and O(N) time complexity correspondingly, but B has such a big constant that it has no advantages over A for inputs less then a number of atoms in the Universe. Examples highlights from the answers: Simplex algorithm -- worst-case is exponential time -- vs. known polynomial-time algorithms for convex optimization problems. A naive median of medians algorithm -- worst-case O(N**2) vs. known O(N) algorithm. Backtracking regex engines -- worst-case exponential vs. O(N) Thompson NFA -based engines. All these examples exploit worst-case vs. average scenarios. Are there examples that do not rely on the difference between the worst case vs. average case scenario? Related: The Rise of ``Worse is Better''. (For the purpose of this question the "Worse is Better" phrase is used in a narrower (namely -- algorithmic time-complexity) sense than in the article) Python's Design Philosophy: The ABC group strived for perfection. For example, they used tree-based data structure algorithms that were proven to be optimal for asymptotically large collections (but were not so great for small collections). This example would be the answer if there were no computers capable of storing these large collections (in other words large is not large enough in this case). Coppersmith–Winograd algorithm for square matrix multiplication is a good example (it is the fastest (2008) but it is inferior to worse algorithms). Any others? From the wikipedia article: "It is not used in practice because it only provides an advantage for matrices so large that they cannot be processed by modern hardware (Robinson 2005)."

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• does php mysql_fetch_array works with html input box?

  - by dexter

  this is my entire PHP code: <?php if(empty($_POST['selid'])) {echo "no value selected"; } else { $con = mysql_connect("localhost","root",""); if(mysql_select_db("cdcol", $con)) { $sql= "SELECT * FROM products where Id = '$_POST[selid]'"; if($result=mysql_query($sql)) { echo "<form name=\"updaterow\" method=\"post\" action=\"dbtest.php\">"; while($row = mysql_fetch_array($result)) { echo "Id :<input type=\"text\" name=\"ppId\" value=".$row['Id']." READONLY></input></br>"; echo "Name :<input type=\"text\" name=\"pName\" value=".$row['Name']."></input></br>"; echo "Description :<input type=\"text\" name=\"pDesc\" value=".$row['Description']."></input></br>"; echo "Unit Price :<input type=\"text\" name=\"pUP\" value=".$row['UnitPrice']."></input></br>"; echo "<input type=\"hidden\" name=\"mode\" value=\"Update\"/>"; } echo "<input type=\"submit\" value=\"Update\">"; echo "</form>"; } else {echo "Query ERROR";} } } ?> PROBLEM here is, ....if the value i am getting from database using mysql_fetch_array($result) is like:(say Description is:) "my product" then; in input box it shows only "my" the word(or digit) after "SPACE"(ie blank space) doesn't get displayed? can input box like above can display the data with two or more words(separated by blank spaces)?

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• virt-install error: Host does not support any virtualization options

  - by gr33d

  Completed CentOS 5.4 perfect install from howtoforge.com (ISPConfig 3). I have ISPConfig 3 deployed with a handful of sites. I installed xen: yum install xen kernel-xen i installed the recommended (linuxtopia.org) virtualization packages and started libvirtd yum install virt-manager libvirt libvirt-python libvirt-python python-virtinst i have damn small linux .iso in /root virt-install --name damnsmall --ram 16 --file=/var/lib/xen/images/damnsmall.img --file-size=1 --vnc --cdrom=/root/current.iso yields the error: ERROR Host does not support any virtualization options i have also tried this from GNOME (virt-manager) and i cant even add a connection. i read somewhere i need to reboot with the xen kernel--i dont think i want to do that--though, not really sure why. i need to keep ISPConfig untouched. Thanks in advance, and let me know if you need additional info

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• mini linux to use dd and access HD and/or USB

  - by acidzombie24

  I was thinking about something. I want to install a 7gb partition and store 2 compress disk image and install linux to it. I want it to be light. What i would like to do is hide the grub loader (or anything) and if i want to reformat my PC press a certain key on startup. Which will then load the linux OS and then i can use dd to restore the partition i want I plan to use windows XP and windows 7 as my main OS and virtualize anything else i need (vista, dummy XP for testing, multiple linux distos, etc). Bonus points if you can tell me how to hide the partition in windows so XP and 7 cant touch it

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• How do you recommend installing Linux on a computer that has no external drive or ability to boot fr

  - by 7777

  I have an old Toshiba Portege 3505 "ultralight" laptop, meaning it doesn't have any kind of disk drive on it at all, that I'd like to completely reformat and install Linux on. However, it won't boot from any drive (and I don't have any on hand), so I'll have to install it from a USB drive (which I doubt it boots from either). (I'm not sure how to change the settings in my BIOS to get my computer to boot from a USB stick. Any ideas for this?) How do you recommend I do this? I want to note that I don't want to run Linux off a LiveUSB, I want to actually install it on the machine. I was thinking about Damn Small Linux, it's tiny and all I need. Any advice or suggestions for something else though? Finally, I'm a total newbie to this, I've never installed Linux on anything before so I might be a little slow on some stuff! Thanks!

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• Best distro for eee-pc [closed]

  - by a_m0d

  Possible Duplicate: A minimal Linux distribution for my ASUS EEE PC I am looking at buying an Asus eee PC and would like some input from the community on the different distros / OS's out there for it. I have heard that the Xandros distro that comes with the net-book isn't that great (lack of software, etc.), but I wonder what all the SuperUsers out there think. Please answer with one distro / OS per answer, and list (at least some of) the advantages and disadvantages of your choice. EDIT: To clarify, the version I am looking at is the 701 SSD, with the 8GB hard drive.

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• Which linux distro for a laptop in windows environmet?

  - by Dev er dev

  I just got new laptop at work. What would you recommend as a linux distribution for it? All other developers are working under windows, and use windows tools. I'm currently using ArchLinux, but want to change it. I don't want to waste time configuring wireless, windows network shares, network pritners, projector, etc ... I want this stuff to just work, while still having sane and stable development evironment and tools. Is Ubuntu a good choice for this? I use gentoo at home, but don't think it is a good match for work environmet. EDIT: Note that we are working on cross platform apps, and deployment platform is almost always linux. There are very few windows apps that I have to use (like MS Project). It is just that everything else is windows centric. I use linux because I feel more productive with it, even if I have to dual boot to edit MS Project files.

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• Which Linux is the most efficient?

  - by quandary

  Simple question: There is a gazillion Linux distributions out there. Which one (distribution/incl. window manager) makes (technically) the most efficient use of my (aging) computer ? I have appx. 1 GB RAM and a 1.6 GHz processor, 120 GB hd. I develop applications (C++/.NET/mono/ASP/PostGre SQL/). Usually, I prefer distros with apt-get. Anybody knows which one takes the most care of my limited RAM, and wich one is the fastest/slimmest of them all, that has a decent repo and is damn fast)

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• Linux Distro for Beginners

  - by XLR3204S

  Well... I know that's the question arising all over the Internet, but I couldn't find an answer to suit me after googling for quite some time. I'd like to get a Linux distribution, and start learning using the CLI. I'm looking for a distribution already having GNOME installed, as I'll be using Linux-Command.org as my learning resource, and I'm not very familiar with CLI-based web browsers. I'd mainly like to get to know my way around a UNIX-based system, and then I think I'd like to pick up a CLI-only distribution, and start doing more complex stuff. I've tried Ubuntu, Fedora Core, OpenSolaris and FreeBSD (the last two aren't linux distros, I know). Ubuntu and FC are fine, they do come with Firefox, but I'm not really sure they're meant for learning purposes. OpenSolaris was OK as well, but I haven't got to play with it enough. FreeBSD 7.2 did not want to install itself on my 13" MacBook Pro, it generated a kernel panic everytime while copying the files to the disk. So to sum this up, I'm trying to learn Linux, and I'm willing to invest time into this (that is, not giving up when the first problems arise). I also have intermediate knowledge of C++, if it helps, and I'm also using the CLI-vim to write small C++ CLI-based programs, so text editing should be any problem. And... speaking of Macs, how am I going to be limited if I try to learn how to use UNIX-based systems using the OS X Terminal? It uses bash 3.2, isn't this the same shell as the one found on most of the Linux machines? How does the fact that OS X is based on FreeBSD 4.4, if I'm not mistaking, affect this? Thanks in advance, and hopefully, I'll have a starting point ASAP.

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