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  • Django save, column specified twice

    - by realshadow
    Hey, I would like to save a modified model, but I get Programming error - that a field is specified twice. class ProductInfo(models.Model): product_info_id = models.AutoField(primary_key=True) language_id = models.IntegerField() product_id = models.IntegerField() description = models.TextField(blank=True) status = models.IntegerField() model = models.CharField(max_length=255, blank=True) label = models.ForeignKey(Category_info, verbose_name = 'Category_info', db_column = 'language_id', to_field = 'node_id', null = True) I get this error because the foreign key uses as db_column language_id. If I will delete it, my object will be saved properly. I dont quite understand whats going on and since I have defined almost all of my models this way, I fear its totally wrong or maybe I just missunderstood it... Any ideas? Regards

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  • How to generate a private/public key pair to use for a Linux server on Windows Azure?

    - by MainMa
    Following Windows Azure documentation, I generated a pair of private/public keys on an Ubuntu machine using the exact comment as given: openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout myPrivateKey.key -out myCert.pem When I open the private key in puttygen, the following error is displayed: Couldn't load private key (unrecognised key type) The private key generated by openssl looks correct: -----BEGIN PRIVATE KEY----- MIIEvQIBADANBgkqhkiG6w0xAQEFAASCBKcwggSjAgEsAoIBAQC6OEZ5ULe6F6u2 Cybhqqfqqh2ao9sd2tpqB+HGIoMMHrmnD3YegRgZJIddTQaWKdwaKrYul21YNt5y ... P0RyfL9kDnX/XmIOM38FOoucGvO+Zozsbmgmvw6AUhE0sPhkZnlaodAU1OnfaWJz KpBxkXulBaCJnC8w29dGKng= -----END PRIVATE KEY----- Note that the comments to Azure documentation (the same link as above) report that the pair should be generated using OpenSSL for Windows instead of openssl on Linux. This doesn't help, since the same error appears for a private key generated by OpenSSL for Windows. What am I doing wrong?

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  • Use of Java constructors in persistent entities

    - by Mr Morgan
    Hello I'm new to JPA and using persistence in Java anyway and I have two questions I can't quite work out: I have generated tags as: @JoinColumn(name = "UserName", referencedColumnName = "UserName") @ManyToOne(optional = false) private User userName; @JoinColumn(name = "DatasetNo", referencedColumnName = "DatasetNo") @ManyToOne(optional = false) private Dataset datasetNo; But in one of the constructors for the class, no reference is made to columns UserName or DatasetNo whereas all other columns in the class are referenced in the constructor. Can anyone tell me why this is? Both columns UserName and DatasetNo are 'foreign keys' on the entity Visualisation which corresponds to a database table of the same name. I can't quite work out the ORM. And when using entity classes, or POJO, is it better to have class variables like: private User userName; Where an instance of a class is specified or simply the key of that class instance like: private String userName; Thanks Mr Morgan.

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  • Reset user passwd when you don't know it

    - by warren
    I have a small problem. I have shared keys setup on my domain, so I never type my password to login anymore. I've forgotten my password now. This is a problem because only my user can sudo. Password authentication for root has been disabled, so without my password, I cannot do maintenance on my web server. Is there a way to reset my password as my [now only] key-authenticated user? Specifically, can this be done on CentOS 4?

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  • Migrate wireless settings from xp to windows 7

    - by Tgr
    I'm trying to migrate the settings of my old machine (Win XP Professional) to the new one (Win 7 Professional) and I would like to keep my saved passwords for various wireless networks. How can I export them from XP and import in Win7? A few things that are mentioned a lot in chat groups but don't work: netsh can export/import wlan profiles on Vista/Win7, but not on XP; the Wireless Network Setup Wizard can only export settings for networks created by me; the best method I found was via http://www.nirsoft.net/utils/wireless_wep_key_faq.html which can list hex keys, but cannot load them nor save them in a useful format; I would rather not copy them one-by-one by hand.

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  • "Sticky button" configuration under X11/Ubuntu?

    - by John Whitley
    Is there a configuration or app that will enable Sticky-keys like functionality for a pointer button under X11? (On Ubuntu 9.10, FWIW.) To be clear, I'd like a single tap (down/up events) to be treated as a down event, and a following tap to be treated as an up event. Context: I have a trackball with a fourth button that I've mapped to act as horizontal/vertical scroll. This works great. It'd be even better if I didn't have to hold the button down when scrolling.

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  • Fingerprint of PEM ssh key

    - by Unknown
    I have a PEM file which I add to a running ssh-agent: $ file query.pem query.pem: PEM RSA private key $ ssh-add ./query.pem Identity added: ./query.pem (./query.pem) $ ssh-add -l | grep query 2048 ef:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX ./query.pem (RSA) My question is how I can get the key fingerprint I see in ssh-agent directly from the file. I know ssh-keygen -l -f some_key works for "normal" ssh keys, but not for PEM files. If I try ssh-keygen on the .pem file, I get: $ ssh-keygen -l -f ./query.pem key_read: uudecode PRIVATE KEY----- failed key_read: uudecode PRIVATE KEY----- failed ./query.pem is not a public key file. This key starts with: -----BEGIN RSA PRIVATE KEY----- MIIEp.... etc. as opposed to a "regular" private key, which looks like: -----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: AES-128-CBC,E15F2.... etc.

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  • Databases design - one link table or multiple link tables?

    - by David
    Hi there, I'm working on a front end for a database where each table essentially has a many to many relationship with all other tables. I'm not a DB admin, just a few basic DB courses. The typical solution in this case, as I understand it, would be multiple link tables to join each 'real' table. Here's what I'm proposing instead: one link table that has foreign key dependencies to all other PKs of the other tables. Is there any reason this could turn out badly in terms of scalability, flexibility, etc down the road?

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  • How to secure Firefox traffic (+DNS) through SOCKS proxy under Ubuntu 10.04?

    - by Maarx
    I'm using Ubuntu 10.04, and starting a SOCKS proxy with 'ssh -D', and setting Ubuntu to use it with "System - Preferences - Network Proxy". Firefox uses the proxy, and the proxy's IP appears when I visit a site like http://www.whatismyip.com/. My question is, is Firefox resolving DNS requests through this proxy? Is my web-browsing truly secure? (That is, until I exit the other end of the proxy. I know it's insecure after that.) (And I've verified the keys, I'm not being man-in-the-middled) (And--screw it. You know what I mean. Is it resolving DNS requests through the proxy?) I don't know how I would go about verifying such a thing for myself. Using additional hardware such as another debugging proxy is not an option. If Firefox isn't resolving my DNS requests through the SOCKS proxy, how do I go about fixing it?

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  • How do I disable the fade out/fade in effect when unlocking a WIndows 7 workstation?

    - by Timwi
    When I press Win+L, the “Locked” screen (with the password prompt) appears immediately. That’s nice, but not terribly important: I’m probably leaving the computer anyway. But after I type the password (to unlock the workstation), the desktop doesn’t appear immediately: instead, the “Locked” screen slowly fades out, the desktop slowly fades in, wasting my time, and all keys (e.g. Win+R) pressed during this interval are completely swallowed, forcing me to wait unnecessarily. This is extremely annoying because when I unlock the workstation, I generally want to use my computer. How do I disable this fade out/fade in effect and have the desktop appear immediately, in the same way that the “Locked” screen appears immediately?

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  • What stage of normalization is this? (moving repeating data into separate table)

    - by Sergio
    Hi There, I have noticed that when designing a database I tend to shift any repeating sets of data into a separate table. For example, say I had a table of people, with each person living in a state. I would then move these repeating states into a separate table and reference them with foreign keys. However, what if I was not storing any more data about states. I would then have a table with StateID and State in. Is this action correct? State is dependant on the primary key of the users table, so does shifting it into its own table help with anything? Thanks,

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  • Citrix ICA Client on Mac shift key doesn't work as expected

    - by brianegge
    When I'm connected to a Windows XP computer from my Mac OS X 10.6 using the Citrix ICA Client, it seems that the shift key only works for the first letter typed after pressing shift. In order to type multiple uppercase letters, like ICA, I must either press caps lock, or press and release shift before each character. I've tried switching between standard and enhanced keyboard, as well as the 'Send Special Keys Unchanged' option, but none of these seem to affect the issue. The problem doesn't occur when I switch from the Citrix window to a regular Mac window.

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  • Export SSL Cert from IIS and import into GlassFish keystore

    - by Tim H
    What I need: I have an existing SSL certificate installed on IIS 6. On the same machine, I have GlassFish installed and would like to share the same certificate since they both share the same hostname, and they use different ports: IIS uses 443 and GlassFish uses 8181. Why I need it: Reuse existing SSL certs from IIS to GlassFish. I imagine that this is possible. I am able to install an SSL cert into GlassFish's keystore, and then import the same exact cert into IIS. I just want to go the other way - imagine having an SSL cert on IIS being used for months, and now I want to enable SSL on GlassFish. What I have done: Created a keystore with an alias: server.hostname.com Imported intermediate CA certs associated with the existing SSL Cert Imported the existing SSL cert with the same alias: server.hostname.com, but the keytool won’t allow this, as it is not associated: keytool error: java.lang.Exception: Public keys in reply and keystore don't match Why? Using a different alias causes the cert to not be trusted in the CA chain.

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  • SOA design principles with regards to database relationships

    - by Eitan
    If I were to extricate my current membership provider from my solution, i.e. as a dll and expose it as a web service with it's own db, how would I model the relationships with regards to SOA design. For example I have a table: USER id, name, lastname, username, password, role. and table PRODUCT id, name, price, createdate, userid the foreign key being userid to table user. How would I model the relationship and/or query the db. If I wanted to get all products that were uploaded today for example, before I would query: SELECT u.name, u.lastname, u.username, p.* FROM PRODUCT p INNER JOIN USER u ON p.userid = u.id WHERE createdate = '05/05/2010' Now that I don't have the table within the database how would I perform this query? Thanks.

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  • What is the fastest way to reload history commands begin with certain characters in linux?

    - by gerry
    In Dos we can input the first several characters to filter command history and find proper one rapidly. But how to do the same thing in Linux ? for example when I am testing a local server: cd sudo /etc/init.d/vsftpd start wget ... ls emacs ... sudo /etc/init.d/vsftpd restart sudo /etc/init.d/vsftpd stop ... In Dos you can easily type sudo and switch among the three commands beginning with it using arrow keys. But in Linux, is below command the best we can do ? historty | grep sudo I don't like it, because history can easily become a mess, and it also need mouse action.

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  • How to deploy a visual studio custom tool?

    - by Aen Sidhe
    Hello. I have a my own custom tool for Visual Studio 2008 SP1. It consists of 5 assemblies: 3 assemblies with code that used heavily in my other projects, 1 assembly-wrapper above VS2008 SDK and assembly with the tool. If I'd debug my tool from visual studio, using "Run external program" option with command line "C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" and arguments "/ranu /rootsuffix Exp" all work perfectly. After that I trying to deploy it to my working VS copy, not to experimental hive doing: gacutil /i Asm1.dll for all my assemblies and doing RegAsm Asm1.dll only for assembly with custom tool. Neither of utils prints any error, all work as planned, even registry keys appeared. But my tool don't work even after PC restart. What did I do wrong? Wrapper looks like that: [ComVisible(true)] public abstract class CustomToolBase : IVsSingleFileGenerator, IObjectWithSite { #region IVsSingleFileGenerator Members int IVsSingleFileGenerator.DefaultExtension(out string pbstrDefaultExtension) { pbstrDefaultExtension = ".cs"; return 0; } int IVsSingleFileGenerator.Generate(string wszInputFilePath, string bstrInputFileContents, string wszDefaultNamespace, IntPtr[] rgbOutputFileContents, out uint pcbOutput, IVsGeneratorProgress pGenerateProgress) { GenerationEventArgs gea = new GenerationEventArgs( bstrInputFileContents, wszInputFilePath, wszDefaultNamespace, new ServiceProvider(Site as Microsoft.VisualStudio.OLE.Interop.IServiceProvider) .GetService(typeof(ProjectItem)) as ProjectItem, new GenerationProgressFacade(pGenerateProgress) ); if (OnGenerateCode != null) { OnGenerateCode(this, gea); } byte[] bytes = gea.GetOutputCodeBytes(); int outputLength = bytes.Length; rgbOutputFileContents[0] = Marshal.AllocCoTaskMem(outputLength); Marshal.Copy(bytes, 0, rgbOutputFileContents[0], outputLength); pcbOutput = (uint)outputLength; return VSConstants.S_OK; } #endregion #region IObjectWithSite Members void IObjectWithSite.GetSite(ref Guid riid, out IntPtr ppvSite) { IntPtr pUnk = Marshal.GetIUnknownForObject(Site); IntPtr intPointer = IntPtr.Zero; Marshal.QueryInterface(pUnk, ref riid, out intPointer); ppvSite = intPointer; } void IObjectWithSite.SetSite(object pUnkSite) { Site = pUnkSite; } #endregion #region Public Members public object Site { get; private set; } public event EventHandler<GenerationEventArgs> OnGenerateCode; [ComRegisterFunction] public static void Register(Type type) { using (var parent = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\VisualStudio\9.0", true)) foreach (CustomToolRegistrationAttribute ourData in type.GetCustomAttributes(typeof(CustomToolRegistrationAttribute), false)) ourData.Register(x => parent.CreateSubKey(x), (x, name, value) => x.SetValue(name, value)); } [ComUnregisterFunction] public static void Unregister(Type type) { using (var parent = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\VisualStudio\9.0", true)) foreach (CustomToolRegistrationAttribute ourData in type.GetCustomAttributes(typeof(CustomToolRegistrationAttribute), false)) ourData.Unregister(x => parent.DeleteSubKey(x, false)); } #endregion } My tool code: [ComVisible(true)] [Guid("55A6C192-D29F-4e22-84DA-DBAF314ED5C3")] [CustomToolRegistration(ToolName, typeof(TransportGeneratorTool))] [ProvideObject(typeof(TransportGeneratorTool))] public class TransportGeneratorTool : CustomToolBase { private const string ToolName = "TransportGeneratorTool"; public TransportGeneratorTool() { OnGenerateCode += GenerateCode; } private static void GenerateCode(object s, GenerationEventArgs e) { try { var serializer = new XmlSerializer(typeof (Parser.System)); using (var reader = new StringReader(e.InputText)) using (var writer = new StringWriter(e.OutputCode)) { Generator.System = (Parser.System) serializer.Deserialize(reader); Generator.System.Namespace = e.Namespace; Generator.GenerateSource(writer); } } catch (Exception ex) { e.Progress.GenerateError(ex.ToString()); } } } Resulting registry keys: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Generators] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Generators\{FAE04EC1-301F-11D3-BF4B-00C04F79EFBC}] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Generators\{FAE04EC1-301F-11D3-BF4B-00C04F79EFBC}\TransportGeneratorTool] @="TransportGeneratorTool" "CLSID"="{55a6c192-d29f-4e22-84da-dbaf314ed5c3}" "GeneratesDesignTimeSource"=dword:00000001 "GeneratesSharedDesignTimeSource"=dword:00000001

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  • Dell Dimension running Fedora12 does a "Sleeping Beauty" and I am not am not a "handsome prince"!

    - by Jim Dobbs
    Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedora12 does a "Sleeping Beauty" and I, apparently, am not am not a "handsome prince"! The system puts video and network to sleep and it will not wakeup. I have heard of this problem on laptops, but this is a tower. Any ideas or help is appreciated. I tried to ping the network card from another system and ping fails. The logs indicate that the system continues to be active. Pressing keyboard short-cut keys makes the disk light blink but neither the video or network card comes alive. Failing all else, are there any Linux commands that I could schedule in cron to pulse video and network adapters hourly that will keep them awake? Or, should I wait on Fedora13? Before this machine, I built a Dimension 2400 with Pentium IV and it had the same problem. Fedora9 on the same hardware is fine.

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  • eAccelerator ignore my new setting?

    - by Mwebe Nkrumah
    Hi, Im using eAccelerator 0.9.5.2, CentOS 5.3, lighttpd 1.4.22 But because eAccelerator is cached in RAM, I needs too much RAM. So Im trying to cache in hard disk. (my website is not generate money, so Im thinking about cheaper solution) So, I modify /etc/php.d/eaccelerator.ini with below codes: extension="eaccelerator.so" eaccelerator.shm_size="12" eaccelerator.cache_dir="/var/cache/eaccelerator" eaccelerator.enable="1" eaccelerator.optimizer="1" eaccelerator.check_mtime="0" eaccelerator.debug="0" eaccelerator.filter="" eaccelerator.shm_max="20M" eaccelerator.shm_ttl="1800" eaccelerator.shm_prune_period="0" eaccelerator.shm_only="0" eaccelerator.compress="0" eaccelerator.compress_level="9" eaccelerator.keys="disk_only" eaccelerator.sessions="disk_only" eaccelerator.content="disk_only" So, the output of phpinfo() as below: http://img175.imageshack.us/img175/1104/screenshggot.png But after using "disk_only" in eAccelerator and restart lighttpd & php-cgi using killall, my RAM usage is still high for php-cgi. Reboot the server also not works. The data is created in cache directory, but RAM usage is still high.

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  • What resources will help me understand the fundamentals of Relational Database Systems.

    - by Rachel
    This are few of the fundamental database questions which has always given me trouble. I have tried using google and wiki but I somehow I miss out on understanding the functionality rather than terminology. If possible would really appreciate if someone can share more insights on this questions using some visual representative examples. What is a key? A candidate key? A primary key? An alternate key? A foreign key? What is an index and how does it help your database? What are the data types available and when to use which ones?

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  • Inverted question mark only on Microsoft Office applications

    - by inerte
    My dad has a notebook and the key which has the "/?°" symbols acts like ctrl. Known factory problem. Anyway, his keyboard also has a "?" marked under the "w" key. Pressing ctrl + alt + w will display the "?" character (question, interrogation mark). Except on Office applications, like Word and Outlook, which will output "¿". I've searched Word and Outlook menus looking for a parameter that could be, somehow, remapping the notebooks keyboards, applying different regional configurations, language, or encodings. Since it only happens on Office apps, I believe the solution is within its options, but I was unable to find it where. Pressing ctrl + alt gr + w will display ? correctly, but I am stumped by this problem. I could remap the keys and make "/?° behave correctly, but my curiosity now is eating me alive. Why only on Office?

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  • 'Game Show' presentation

    - by albatross
    I work at a state university, and every day of summer orientation we have a little jeopardy-like game that new students' parents play. We run it in an auditorium. Right now the game is a powerpoint presentation (set up similar to jeopardy) off an old laptop running Powerpoint 2003. What I want to do is to purchase & use a smaller tablet/mini-book with a touchscreen. The touchscreen would be much more professional than dragging a mouse around the screen to select category questions. I also want to use hot keys during the presentation for sound effects (for correct + incorrect answers), and I want to play music and show an automated slideshow (photos from the day). This device would need vga or hdmi and audio out. I've been looking at iPads and iPad alternatives, but figured someone out there might have a better idea or done this before.

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  • black screen while retrieving result from webservices in android

    - by Aswan
    Hi Folks i am using following webservices for retrieving data from server server side:.net client side:ksoap2 whenever activity start, onCreate i am using spinner for displying data returned by the webservices when this activity start it showing black screen after lunching the activity .i found black screen is coming when activity connecting to webservices How to resolve this MyCode public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { //Display the online and busy people display in spinner //people are display in relative people only(Mygroup) /* get the online and busy people who are in user group from DB*/ users_names_ids=new ParseXMLString().convertusernames(new DataParsingComm().ILGetOnlinePeoples("<spGetOnlinePeoples><UserID>"+GetCurrentUserID.id+"</UserID></spGetOnlinePeoples>")); /* create an array with the size of number of peoples whose status is online or busy */ String[] array =new String[users_names_ids.size()]; int setselction=0;// initialize the selection to 0. /* if array length is greater than zero, that means getting at least one person whose status is online or busy */ if(array.length>0){ /* Returns an enumeration on the keys of this Hashtable instance. And assigns into Enumeration instance variable */ Enumeration e= users_names_ids.keys(); /* Iterate list Enumeration until it does't has any more elements */ for(int i=0;e.hasMoreElements();i++) try{ /* get all persons names into the array list */ array[i]=e.nextElement().toString(); /* Get the ChatUserName value from the ChatInPeopleDetails preferences. And If it is in this list set selection to the index 'i' */ if(getSharedPreferences("ChatInPeopleDetails", 0).getString("ChatUserName", "").equals(array[i])) setselction=i; /* * Get the String value of Relname, that previously added with putExtra() as extended data to the parent intent * If that value is not null and exists in the array list then * set the selection to the index 'i'. * */ else if(getIntent().getStringExtra("Relname")!=null && getIntent().getStringExtra("Relname").equals(array[i])) setselction=i; }catch(Exception ex){ ex.printStackTrace(); } finally { System.gc(); System.runFinalization(); } } /* create a new array adapter with the ChatForm context and array objects */ ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(ChatForm.this,android.R.layout.simple_spinner_item, array); /* Set the layout resource to create the drop down views. */ adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); /* The Adapter is used to provide the data which backs this Spinner SpinnerUsersToChat. */ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setAdapter(adapter2); /* Get the ChatUserName value from the ChatInPeopleDetails preferences. If this value is not null*/ if(getSharedPreferences("ChatInPeopleDetails", 0).getString("ChatUserName", "") !=null) { /* Set the currently selected item of spinner based on selection variable value */ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setSelection(setselction); } /* Register a callback to be invoked when an item in this AdapterView has been selected.*/ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent,View v,int position,long id) { /* call getMsg() to get messages and display them*/ getMsg(); /* Causes the Runnable to be added to the message queue. The runnable will be run on the user interface thread.*/ ((ScrollView)findViewById(R.id.ScrollView06)).post(new Runnable() { public void run() { /* This fullScroll() method will scroll the view to the bottom .*/ ((ScrollView)findViewById(R.id.ScrollView06)).fullScroll(View.FOCUS_DOWN); } }); } /* on nothing selected to do somthing . this an overridden method */ public void onNothingSelected(AdapterView<?> arg0) { } }); } catch (Exception e1) { e1.printStackTrace(); } }

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  • Dynamically specify the type in C#

    - by Lirik
    I'm creating a custom DataSet and I'm under some constrains: I want the user to specify the type of the data which they want to store. I want to reduce type-casting because I think it will be VERY expensive. I will use the data VERY frequently in my application. I don't know what type of data will be stored in the DataSet, so my initial idea was to make it a List of objects, but I suspect that the frequent use of the data and the need to type-cast will be very expensive. The basic idea is this: class DataSet : IDataSet { private Dictionary<string, List<Object>> _data; /// <summary> /// Constructs the data set given the user-specified labels. /// </summary> /// <param name="labels"> /// The labels of each column in the data set. /// </param> public DataSet(List<string> labels) { _data = new Dictionary<string, List<object>>(); foreach (string label in labels) { _data.Add(label, new List<object>()); } } #region IDataSet Members public List<string> DataLabels { get { return _data.Keys.ToList(); } } public int Count { get { _data[_data.Keys[0]].Count; } } public List<object> GetValues(string label) { return _data[label]; } public object GetValue(string label, int index) { return _data[label][index]; } public void InsertValue(string label, object value) { _data[label].Insert(0, value); } public void AddValue(string label, object value) { _data[label].Add(value); } #endregion } A concrete example where the DataSet will be used is to store data obtained from a CSV file where the first column contains the labels. When the data is being loaded from the CSV file I'd like to specify the type rather than casting to object. The data could contain columns such as dates, numbers, strings, etc. Here is what it could look like: "Date","Song","Rating","AvgRating","User" "02/03/2010","Code Monkey",4.6,4.1,"joe" "05/27/2009","Code Monkey",1.2,4.5,"jill" The data will be used in a Machine Learning/Artificial Intelligence algorithm, so it is essential that I make the reading of data very fast. I want to eliminate type-casting as much as possible, since I can't afford to cast from 'object' to whatever data type is needed on every read. I've seen applications that allow the user to pick the specific data type for each item in the csv file, so I'm trying to make a similar solution where a different type can be specified for each column. I want to create a generic solution so I don't have to return a List<object> but a List<DateTime> (if it's a DateTime column) or List<double> (if it's a column of doubles). Is there any way that this can be achieved? Perhaps my approach is wrong, is there a better approach to this problem?

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  • How to ignore query parameters in web cache?

    - by eduardocereto
    Google Analytics use some query parameters to identify campaigns and to do cookie control. This is all handled by javascript code. Take a look at the following example: http://www.example.com/?utm_source=newsletter&utm_medium=email&utm_ter m=October%2B2008&utm_campaign=promotion This will set cookies via JavaScript with the right campaign origin. This query parameters can have multiple and sometimes random values. Since they are used as cache hash keys the cache performance is heavily degraded in some scenarios. I suppose there's a not so hard configuration on cache servers to just ignore all query parameters or specific query parameters. Am I right? Does anyone know how hard is it in popular web cache solutions, to create ? I'm not interested in a specific web cache solution. It would be great to hear about the one you use.

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  • how to feed a file to telnet

    - by knittl
    hello community, understanding http and headers i played around with telnet to send requests. to not type everything again and again and again i thought i'd write a small textfile with all the commands i need. my file is as simple as follows: GET /somefile.php HTTP/1.1 Host: localhost i then try to feed it to telnet with io-redirection: $ telnet localhost 80 < telnet.txt but all output i get is Trying ::1... Connected to localhost. Escape character is '^]'. Connection closed by foreign host. what am i doing wrong?

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