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• Should functional programming be taught before imperative programming?

  - by Zifre

  It seems to me that functional programming is a great thing. It eliminates state and makes it much easier to automatically make code run in parallel. Many programmers who were first taught imperative programming styles find it very difficult to learn functional programming, because it is so different. I began to wonder if programmers who were taught functional programming first would find it hard to begin imperative programming. It seems like it would not be as hard as the other way around, so I thought it would be a good thing if more programmers were taught functional programming first. So, my question is, should functional programming be taught in school before imperative, and if so, why is it not more common to start with it?

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• WM_CONCAT with DISTINCT Clause - Compiled Package versus Stand-Alone Query Issue

  - by Reimius

  I was writing some program that uses the WM_CONCAT function. When I run this query: SELECT WM_CONCAT(DISTINCT employee_id) FROM employee WHERE ROWNUM < 20; It works fine. When I try to compile the relatively same query in a package function or procedure, it produces this error: PL/SQL: ORA-30482: DISTINCT option not allowed for this function FUNCTION fetch_raw_data_by_range RETURN VARCHAR2 IS v_some_string VARCHAR2(32000); BEGIN SELECT WM_CONCAT(DISTINCT employee_id) INTO v_some_string FROM employee WHERE ROWNUM < 20; RETURN v_some_string; END; I realize WM_CONCAT is not officially supported, but can someone explain why it would work as a stand alone query with DISTINCT, but not compile in a package?

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• How to use @FileUpload.GetHtml inside Html.BeginForm and sumbit FilesList

  - by Diode

  There is a default submit button for the @FileUpload.GetHtml. But I am expecting to have a submit button inside the Html begin form and use that substitution to submit the list of files with some more parameters. But when I do that the passing IEnumerable is always null in the Action method. This is my Action method: [HttpPost] public ActionResult Change(IEnumerable filesList, Guid ID, string Btn) {.... @using (Html.BeginForm("Change", "Home",FormMethod.Post)) { <textarea id="textArea" name="epost2" class="frm_txtfield_big" style="float:left; width:638px; height:200px;"></textarea> <input type="hidden" name="supportID" value="@Model.ID" /> @FileUpload.GetHtml(name: "ChooseFile",initialNumberOfFiles: 1,allowMoreFilesToBeAdded: true,includeFormTag: false) .......} But this is not passing the list of files to the method. Am doing it wrong or what is the wrong with the code.

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• Hidden/best features of TextPad

  - by Binoj Antony

  I use Textpad as a text editor, so far I have found few of the features to be invaluable, please list features and keyboard shortcuts you find to be useful. CTRL + SHIFT + G : Selecting a file name and pressing this key combination will open this file in the editor. ALT + Mouse Left click + drag : This will let you select (to copy or cut) text vertically. CTRL + F5 : Find in files in subfolders. CTRL + M : To locate the matching end/begin braces. Regular expression support in find and replace. CTRL + F9 : Compare files Editable syntax hilighting Macros Abundance of free extensions Hope there are people out there who use Textpad.

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• how to get Celsius as output from LM335Z with arduino?

  - by wizztjh

  the firstsensor is my lm335z output. int firstSensor = 0; int secondSensor = 0; int thirdSensor = 0; int inByte = 0; void setup() { Serial.begin(9600); establishContact(); // send a byte to establish contact until receiver responds } void loop() { if (Serial.available() > 0) { inByte = Serial.read(); firstSensor = analogRead(0); delay(10); secondSensor = analogRead(1); thirdSensor = analogRead(2); Serial.print(firstSensor, DEC); Serial.print(","); Serial.print(secondSensor, DEC); Serial.print(","); Serial.println(thirdSensor, DEC); } } void establishContact() { }

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• RTF to TEXT in sql server

  - by user360109

  I have a RTF field in my SQL 2005 table, I need to convert it to Text and display it. After a quick research I got the following method... create function dbo.RTF2TXT(@in varchar(8000)) RETURNS varchar(8000) AS BEGIN DECLARE @object int DECLARE @hr int DECLARE @out varchar(8000) -- Create an object that points to the SQL Server EXEC @hr = sp_OACreate 'RICHTEXT.RichtextCtrl', @object OUT EXEC @hr = sp_OASetProperty @object, 'TextRTF', @in EXEC @hr = sp_OAGetProperty @object, 'Text', @out OUT EXEC @hr = sp_OADestroy @object return @out END GO select dbo.RTF2TXT('{\rtf1\ansi\ansicpg1252\uc1 aaa}') But Here I am getting only NULL as result... What could be the issue, please suggest Thanks

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• Delphi and prevent event handling

  - by pKarelian

  How do you prevent a new event handling to start when an event handling is already running? I press a button1 and event handler start e.g. slow printing job. There are several controls in form buttons, edits, combos and I want that a new event allowed only after running handler is finnished. I have used fRunning variable to lock handler in shared event handler. Is there more clever way to handle this? procedure TFormFoo.Button_Click(Sender: TObject); begin if not fRunning then try fRunning := true; if (Sender = Button1) then // Call something slow ... if (Sender = Button2) then // Call something ... if (Sender = Button3) then // Call something ... finally fRunning := false; end; end;

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• C#: Pass a user-defined type to a Oracle stored procedure

  - by pistacchio

  With reference to http://stackoverflow.com/questions/980324/oracle-variable-number-of-parameters-to-a-stored-procedure I have s stored procedure to insert multiple Users into a User table. The table is defined like: CREATE TABLE "USER" ( "Name" VARCHAR2(50), "Surname" VARCHAR2(50), "Dt_Birth" DATE, ) The stored procedure to insert multiple Users is: type userType is record ( name varchar2(100), ... ); type userList is table of userType index by binary_integer; procedure array_insert (p_userList in userList) is begin forall i in p_userList.first..p_userList.last insert into users (username) values (p_userList(i) ); end array_insert; How can I call the stored procedure from C# passing a userList of userType? Thanks

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• Retreive a value inside a stored procedure and use it inside that stored procedure

  - by sai

  delimiter // CREATE DEFINER=root@localhost PROCEDUREgetData(IN templateName VARCHAR(45),IN templateVersion VARCHAR(45),IN userId VARCHAR(45)) BEGIN set @version = CONCAT("SELECT saveOEMsData_answersVersion FROMsaveOEMsData WHERE saveOEMsData_templateName = '",templateName,"' ANDsaveOEMsData_templateVersion = ",templateVersion," AND saveOEMsData_userId= ",userId); PREPARE s1 from @version; EXECUTE S1; END // delimiter ; I am retreiving saveOEMsData_answersVersion, but I have to use it in an IF loop, as in if the version == 1, then I would use a query, else I would use something else. But I am not able to use the version. Could someone help with this?? I am only able to print but not able to use the version for data manipulation. The procedure works fine but I am unable to proceed to next step which is the if condition. The if condition would have something like the below mentioned. IF(ver == 1) THEN SELECT "1"; END IF;

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• Image scaling in C

  - by Ganesh

  Hi, I am designing a jpeg to bmp decoder which scales the image. I have been supplied with the source code for the decoder so my actual work is to design a scaler . I do not know where to begin. I have scouted the internet for the various scaling algorithms but am not sure where to introduce the scaling. So should I do the the scaling after the image is converted into bmp or should I do this during the decoding at the MCU level. am confused :( If you guys have some information to help me out, its appreciated. any material to read, source code to analyse etc....

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• Linked servers SQLNCLI problem. "No transaction is active"

  - by Felipe Fiali

  Im trying to execute a stored procedure and simply insert its results in a temporary table, and I'm getting the following message: The operation could not be performed because OLE DB provider "SQLNCLI" for linked server "MyServerName" was unable to begin a distributed transaction. OLE DB provider "SQLNCLI" for linked server "MyServerName" returned message "No transaction is active.". My query looks like this: INSERT INTO #TABLE EXEC MyServerName.MyDatabase.dbo.MyStoredProcedure Param1, Param2, Param3 Exact column number, names, the problem is not the result. MSDTC is allowed and started in both computers, Remote procedure calling too. The machines are not in the same domain, but I can execute remote queries from my machine and get the result. I can even execute the stored procedure and see its results, I just can't insert it in another table. Help, please? :)

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• Intercept UITableView scroll touches

  - by Jonesy

  Is it possible to control when the UITableView scrolls in my own code. I am trying to get behaviour where a vertical swipe scrolls and a horizontal swipe gets passed through to my code (of which there are many example) BUT I want a DIAGONAL swipe to do nothing, i.e the UITableView should not even begin scrolling. I tried catching it in here - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView but the scrollView.contentOffset.x is always 0 so I cannot detect a horizontal movement. I also tried subclassing UITableView and implementing - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event etc.. but the UITableView (and I guess it's parent UIScrollView) start to scroll before the touches are notified? To re-iterate, I want the UITableView scrolling to be locked if a diagonal swipe is made, but to scroll vertically normally. (This behaviour can be seen in Tweetie(Twitter) for the iPhone) Thanks for any help!

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• utf8 codification problem C#, writing a tex file, and compiling with pdflatex

  - by voodoomsr

  Hi, i have the next code written in C#....it create a tex file using utf-8.....the problem is that appears that is not a real valid utf-8 file because, when i use pdflatex it doesn't recognize the characters with accents. Somebody knows a way to write a real UTF-8 file? When i use TexmakerX to create a utf8 file with the same latex code, pdflatex doesn't complaints, so the problem must be in the generation. FileInfo file = new FileInfo("hello.tex"); StreamWriter writer = new StreamWriter("hello.tex", false, Encoding.UTF8); writer.Write(@"\documentclass{article}" + "\n" + @"\usepackage[utf8]{inputenc}" + "\n" + @"\usepackage[spanish]{babel}" + "\n" + @"\usepackage{listings}" + "\n" + @"\usepackage{fancyvrb}" + "\n" + @"\begin{document}" + "\n" + @"\title{asd}" + "\n" + @"\maketitle" + "\n" + @"\section{canción}" + "\n" + @"canción" + "\n" + @"\end{document}"); writer.Close();

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• forloop and table in latex

  - by Tim

  Hi, Here is the latex code for my table: \begin{table}{| c || c | c | c || c | c | c | } \caption{Examples of the concepts. \label{tab:conceptsimgs}}\\ \hline \backslashbox{Concept}{Class} &\multicolumn{3}{|c||}{Negative Class} & \multicolumn{3}{|c|}{Positive Class} \\ \hline \forloop{themenumber}{1}{\value{themenumber} < 4}{ %\hline \arabic{themenumber} \forloop{classnumber}{0}{\value{classnumber} < 2}{ \forloop{imagenumber}{1}{\value{imagenumber} < 4}{ & 0 } } \\ \hline } \end{table} Something is wrong in the result however. There is some extra thing at the end of the table, as shown in this image. How can I fix it? Thanks and regards!

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• Examples of when to use PageAsyncTask (Asynchronous asp.net pages)

  - by Tony_Henrich

  From my understanding from reading about ASP.NET asynchronous pages, the method which executes when the asynchronous task begins ALWAYS EXECUTES between the prerender and the pre-render Complete events. So because the page's controls' events run between the page's load and prerender events, is it true that whatever the begin task handler (handler for BeginAsync below) produces, it can't be used in the controls' events? So for example, if the handler gets data from a database, the data can't be used in any of the controls' postback events? Would you bind data to a data control after prerender? PageAsyncTask pat = new PageAsyncTask(BeginAsync, EndAsync, null, null, true); this.RegisterAsyncTask(pat);

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• Datamining on a mysql database

  - by sliptix

  Hello, I Begin with textmining. I have two database tables with thousands of data.. a table for "skills" and a table for "skills categories" every "skill" belongs to a skills categorie. a "skill" is , physicaly, a varchar(200) field in the database, where there is some text describing the skill. Here are some skills extracted from the skills table: "PHP (good level), Java (intermediaite), C++" "PHP5" "project management and quality management" "begining Javascript" "water engineering" "dfsdf zerze rzer" "cibling customers" what i want to do is to extract knowledge from those fields, i mean extract only the real skill and ignore the rest of useless text. for the above example i want to get only an array with: "PHP" "Java" "C++" "PHP5" "project management" "quality management" "Javascript" "water engineering" "cibling customers" what should i do to extract the skills from tons of data please ? do you know specific algorithms to do this ? ex : k-means ... ? Thanks in advance.

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• IPC using SendMessage but receiver have random window caption

  - by iira

  I found "Delphi Inter Process Communication (IPC) using SendMessage" with Google. Here's a piece of the code from Sender to send a message for Receiver : procedure TfrmClient.FormCreate(Sender: TObject); begin MyMsg := RegisterWindowMessage('MyMessage'); ServerApplicationHandle := FindWindow('TApplication', 'Project1'); end; The problem is my receiver have random caption name. So how can I send a message to receiver? Any idea? My Sender is a DLL and my receiver is Exe.

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• Resizing screenshots/screen captures for inclusion in Beamer

  - by Stephen

  Sorry, this may or may not be a programming question directly, but I am trying to resize screenshots with Imagemagick and Gimp to include in a Beamer presentation, but it comes out even blurrier than the resizing done by LaTeX. For instance, in Beamer I might have a command to rescale the image \includegraphics[width=.5\textwidth]{fig.png}. Using something like \begin{frame} \message{width = \the\textwidth} \message{height = \the\textheight} \end{frame} I have gotten the \textwidth and \textheight parameters in points (345.69548, 261.92444). So I have a script (in Python) that sends a system call to Imagemagick: 'convert %s -resize %.6f@ resized_%s' % (f,a,f) where a is calculated as \textwidth*\textheight*0.5**2. When I then go back into my Beamer presentation and include the resized figure, \includegraphics{resized_fig.png}, the size looks approximately correct but it's super-blurry. I also tried resizing in Gimp (using the GUI) but no luck either... help? Thanks...

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• SQL query optimization

  - by nvtthang

  I have a problem with my SQL query that take time to get all records from database. Any body help me. Below is a sample of database: order(order_id, order_nm) customer(customer_id, customer_nm) orderDetail(orderDetail_id, order_id, orderDate, customer_id, Comment) I want to get latest customer and order detail information. Here is may solution: I've created a function that GetLatestOrderByCustomer(CusID) to get lastest Customer information. CREATE FUNCTION [dbo].[GetLatestOrderByCustomer] ( @cus_id int ) RETURNS varchar(255) AS BEGIN DECLARE @ResultVar varchar(255) SELECT @ResultVar = tmp.comment FROM ( SELECT TOP 1 orderDate, comment FROM orderDetail WHERE orderDetail.customer_id = @cust_id ) tmp -- Return the result of the function RETURN @ResultVar END Below is my SQL query SELECT customer.customer_id , customer.customer_nm , dbo.GetLatestOrderByCustomer(customer.customer_id) FROM Customer LEFT JOIN orderDetail ON orderDetail.customer_id = customer.customer_id It's take time to run the function. Could anybody suggest me any solutions to make it better? Thanks in advance.

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• Behaviour of insertion trigger when defining autoincrement in Oracle

  - by Genba

  I have been looking for a way to define an autoincrement data type in Oracle and have found these questions on Stack Overflow: Autoincrement in Oracle Autoincrement Primary key in Oracle database The way to use autoincrement types consists in defining a sequence and a trigger to make insertion transparent, where the insertion trigger looks so: create trigger mytable_trg before insert on mytable for each row when (new.id is null) begin select myseq.nextval into :new.id from dual; end; I have some doubts about the behaviour of this trigger: What does this trigger do when the supplied value of "id" is different from NULL? What does the colon before "new" mean? I want the trigger to insert the new row with the next value of the sequence as ID whatever the supplied value of "new.id" is. I imagine that the WHEN statement makes the trigger to only insert the new row if the supplied ID is NULL (and it will not insert, or will fail, otherwise). Could I just remove the WHEN statement in order for the trigger to always insert using the next value of the sequence?

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• Flex 3.5 Accordion and TabNavigator selectedIndex Bug

  - by majgis

  I'm using Flex 3.5 with Adobe Flex Builder 3. I have found that if you very rapidly click between multiple headers of an accordion component or the tabs of TabNavigator, these components will begin to exhibit odd, unexpected behavior. Once this behavior has been evoked, even trying to set the selectedIndex programmatically does not end in the desired result. Specifically, if set the selectedIndex to zero (or click on the first tab/header) it might temporarily hop to that index but then will finish on a different index. Has anyone else experienced this behavior and do you know of a patch that can prevent the user from getting in a situation where the tab/header they click on is not the one made visible?

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• plpgsql function to generate random readable strings

  - by Peter

  Hi I have written the following function but it's isn't returning anything when I run it. Can somebody help identify the issue? CREATE OR REPLACE FUNCTION GenerateReadableRandomString ( len INT ) RETURNS varchar AS $$ DECLARE validchars VARCHAR; randomstr VARCHAR; randint INT; i INT; BEGIN validchars := 'ABCEFHJKLMNPRTWXY3478'; i := 0; LOOP randint := ceil(random() * char_length(validchars)); randomstr := randomstr || substring(validchars from randint for 1); i := i + 1; EXIT WHEN i = len; END LOOP; RETURN randomstr; END; $$ LANGUAGE plpgsql;

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• OpenXML SDK Spreadsheet starter kits

  - by JWendel

  I am trying to start working with excel documents through the OpenXML SDK Spreadsheet API. But I havent found any good guides or even examples on how to create a xlsx file from scratch. Only how to open an existing document and modify it. I have been thinking on having a empty template document and make a copy of it an then begin my proccessing on it. But it doesent feel right. It might be easier but I not comfortable using a technique I dont feel that I understand "pretty" good atleast. So my question is: Anyone has any god tips on articles or books or any other type of resource that explains the API. Thanks in advance. /johan

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• WCF Windows Service - Long operations/Callback to calling module

  - by A9S6

  I have a Windows Service that takes the name of a bunch of files and do operations on them (zip/unzip, updating db etc). The operations can take time depending on size and number of files sent to the service. (1) The module that is sending a request to this service waits until the files are processed. I want to know if there is a way to provide a callback in the service that will notify the calling module when it is finished processing the files. Please note that multiple modules can call the service at a time to process files so the service will need to provide some kind of a TaskId I guess. (2) If a service method is called and is running and another call is made to the same service, then how will that call be processed(I think there is only one thread asociated with the service). I have seen that when the service is taking time in processing a method, the threads associated with the service begin to increase.

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• Saving a select count(*) value to an integer (SQL Server)

  - by larryq

  Hi everyone, I'm having some trouble with this statement, owing no doubt to my ignorance of what is returned from this select statement: declare @myInt as INT set @myInt = (select COUNT(*) from myTable as count) if(@myInt <> 0) begin print 'there's something in the table' end There are records in myTable, but when I run the code above the print statement is never run. Further checks show that myInt is in fact zero after the assignment above. I'm sure I'm missing something, but I assumed that a select count would return a scalar that I could use above?

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