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  • Converting a certain SQL query into relational algebra

    - by Fumler
    Just doing an assignment for my database course and I just want to double check that I've correctly wrapped my head around relational algebra. The SQL query: SELECT dato, SUM(pris*antall) AS total FROM produkt, ordre WHERE ordre.varenr = produkt.varenr GROUP BY dato HAVING total >= 10000 The relational algebra: stotal >= 10000( ?R(dato, total)( sordre.varenr = produkt.varenr( datoISUM(pris*antall(produkt x ordre)))) Is this the correct way of doing it?

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  • What should I configure when I put Zend project on windows to Ubuntu Lamp?

    - by meyosef
    Hi, What should I configure when I put Zend project on windows to Ubuntu Lamp? (I asking that beacause my Zend progect not working on Ubuntu, its gives first pages, but after i enter to next page its gives me 404 error(page Not Found), I check if rewrite mod enable with : sudo a2enmod rewrite and get: Module rewrite already enabled ::: I dont have such probelm on Zend Ce and Wamp servers on Windows). Thanks, Yosef

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  • jqgrid:cancel deleting row(s)

    - by ohana
    hi, I use jqgrid for my data, and enable user to delete rows from the grid. but when user click 'delete' button, jqgrid will popup a 'Delete' dialog to ask user if they wanna delete or cancel, how can i check if user choose 'cancel" before i really submit data deletion to the server? Thanks.

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  • PInvokeStackImbalance C# call to unmanaged C++ function

    - by user287498
    After switching to VS2010, the managed debug assistant is displaying an error about an unbalanced stack from a call to an unmanaged C++ function from a C# application. The usuals suspects don't seem to be causing the issue. Is there something else I should check? The VS2008 built C++ dll and C# application never had a problem, no weird or mysterious bugs - yeah, I know that doesn't mean much. Here are the things that were checked: The dll name is correct. The entry point name is correct and has been verified with depends.exe - the code has to use the mangled name and it does. The calling convention is correct. The sizes and types all seem to be correct. The character set is correct. There doesn't seem to be any issues after ignoring the error and there isn't an issue when running outside the debugger. C#: [DllImport("Correct.dll", EntryPoint = "SuperSpecialOpenFileFunc", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, ExactSpelling = true)] public static extern short SuperSpecialOpenFileFunc(ref SuperSpecialStruct stuff); [StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)] public struct SuperSpecialStruct { public int field1; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)] public string field2; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)] public string field3; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)] public string field4; public ushort field5; public ushort field6; public ushort field7; public short field8; public short field9; public uint field10; public short field11; }; C++: short SuperSpecialOpenFileFunc(SuperSpecialStruct * stuff); struct SuperSpecialStruct { int field1; char field2[256]; char field3[20]; char field4[10]; unsigned short field5; unsigned short field6; unsigned short field7; short field8; short field9; unsigned int field10; short field11; }; Here is the error: Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'Managed application path'. Additional Information: A call to PInvoke function 'SuperSpecialOpenFileFunc' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

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  • IE not triggering keyboard event on a form with ONE FIELD

    - by raj
    I'm seeing my Friend's code here... <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> Check action </TITLE> <script> function detectEvent(){ if(window.event.keyCode==13) { alert("you hit return!"); } } </script> </HEAD> <BODY> <form name="name1" onkeyup="detectEvent()" action="page2.html"> <p> Field1 <input type="text" id="text1"/> </p> </form> </BODY> </HTML> and when he tried entering a value in the textbox and pressed enter, it did not call the detectEvent(). I said, it'll always call onSubmit on enter button..... and he surprised me, <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> Check action </TITLE> <script> function detectEvent(){ if(window.event.keyCode==13) { alert("you hit return!"); } } </script> </HEAD> <BODY> <form name="name1" onkeyup="detectEvent()" action="page2.html"> <p> Field1 <input type="text" id="text1"/> </p> <p> Field1 <input type="text" id="text2"/> </p> </form> </BODY> </HTML> Now press enter, The function gets called..... Why so!? Why onKeyUp not called on forms with just one field.!!! am i missing something?

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  • java.util.concurrent.ThreadPoolExecutor strange logic

    - by rodrigoap
    Look ath this method of ThreadPoolExcecutor: public void execute(Runnable command) { ... if (runState == RUNNING && workQueue.offer(command)) { if (runState != RUNNING || poolSize == 0) ensureQueuedTaskHandled(command); } ... } It check that runState is RUNNING and then the oposite. As I'm trying to do some tuning on a SEDA like model I wanted to understand the internals of the thread pool. Do you think this code is correct?

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  • Comparing two objects that are the same in MbUnit

    - by Coppermill
    From MBUnit I am trying to check if the values of two objects are the same using Assert.AreSame(RawDataRow, result); However I am getting the following fail: ====================== Expected Value & Actual Value : {RawDataRow: CentreID = "CentreID1", CentreLearnerRef = "CentreLearnerRef1", ContactID = 1, DOB = 2010-05-05T00:00:00.0000000, Email = "Email1", ErrorCodes = "ErrorCodes1", ErrorDescription = "ErrorDescription1", FirstName = "FirstName1"} Remark : Both values look the same when formatted but they are distinct instances. ====================== I don't want to have to go through each property, can I do this from MbUnit

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  • string variable not able to get thevalue

    - by prince23
    hi, i have an variable declated as an object Object obj =e.Row.DataContext; when i go to immediate window and check the value i get like this ?Object obj =e.Row.DataContext; {TempTypeMinus1487405295} People: "7,556,930" Name: "India" string strcounty =obj .Tostring(); now in strcounty i should get as India but i am getting the value as TempTypeMinus1487405295 how can i get the value india in string variable thanks in advance

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  • how to store "2010-03-26 10:13:04 Etc/GMT" mysql?

    - by kkchaitu
    Hi All, I would like to store "2010-03-26 10:13:04 Etc/GMT" value in column of type datetime. when i try to insert it i got exception SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '10:13:04 Etc/GMT', at line 1 how to insert data time with time zone. Thanks in advance. please help me its urgent.

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  • Validate a URL string in my iphone app

    - by Derek
    Hi, I am getting really frustrated and I cant seem to check if the user has entered a valid url or not. This is what I have tried: NSString *str = [NSString stringWithFormat:@"%@", [myurl.text stringByAddinPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSURL *aurl = [NSURL URLWithString:urlStr[; if(aurl == nil){ //Invalid url }

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  • Refactoring many nested ifs or chained if statements

    - by Icarus
    Hi, I have an object with large number of similar fields (like more than 10 of them) and I have to assign them values from an array of variable length. The solution would be either a huge nested bunch of ifs based on checking length of array each time and assigning each field OR a chain of ifs checking on whether the length is out of bounds and assigning each time after that check. Both seem to be repetitive. Is there a better solution ?

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  • Android pattern locking

    - by JonF
    I have been able to lock the screen using LOCK_PATTERN_ENABLED, however in many cases when I enable this pattern locking it will take any pattern and move past the pattern check. Has anyone else run across this?

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  • Swing's KeyListener and multiple keys pressed at the same time.

    - by Negai
    Hi everyone, is there any conventional way in swing of tracking down the events, when two keyboard keys are pressed at the same time? I have a couple of ideas e.g. remembering the key and event generation time so that we could in a consecutive event handler invocation check the time difference between these two events and decide, whether it's a two-button event or not. Phew. But it looks like a kludge. Thanks in advance.

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  • wordpress num rows, how?

    - by krike
    I'm creating a plugin for wordpress and I need to check if a post with a specific title exist or not. This to prevent duplicates, how can I query this and see if it returned true or false?

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  • Kernel api's or using api's in the kernel

    - by user513647
    Hello everybody I'd like to know if and how I can access api calls inside the kernel. I need them to preform several integrity checks on a program of mine running in user mode. But I don't know how I can access the api's and funcions required to do so. Does anybody know how to obtain the process id of my user mode proces? and how to access all it's memory to preform the check? Thanks in advance ps: My I'm on a windows xp machine

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  • Silverlight ItemsControl - change ItemTemplate

    - by Cornel
    I have an ItemsControl with a list of radio buttons - in this case the ItemTemplate will contain a binded radio button. The problem is that in some cases I need to replace the radio button with a check box without using any C# code. Is this possible? I thought at using a ValueConverter (C# code) but I don't know for sure if will work.

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  • Which is more appropriate way of programmming

    - by Raju
    If a variable can take n values should we check for the validity of the values or assume that if all the n-i checks fail it would be the nth value. For example if we have a variable that stores gender as M or F If gender = "M" do male_processing else do female_processing endif If gender = "M" do male_processing else if gender = "F" do female_processing else print "Something has gone wrong Gender has a value " Gender endif endif

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