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• Newbie question - MySQL index size

  - by Tommy

  I've just started to investigating how I should optimize my database. Indexing seems to be a good idea, so I want to index a VARCHAR column, the engine is MyISAM. From what I've read, I understand that an index is limited to a size of 1000 bytes. A VARCHAR character is 3 bytes in size. Does this mean that if I want to index a VARCHAR column with 50 rows, I need an index prefix of 6 characters? I came to that number by dividing 1000 with the row number 50, then the bytesize per character that is 3. 1000/50/3=6,66. It seems a little complicated, so I'm just wondering if I'm thinking right? It seems weird to me that you'd only be able to index 333 rows in a VARCHAR column, using a prefix of 1 character.

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• In which order I had to simplify this Boolean expression?

  - by user3662105

  I have to simplify this Boolean expression but i quite found it difficult since don't know in which order had to start with. the expression is: (x iff y) or (y iff z) if x found it little complicated to simplify since i don't know the order do I have to write it like: ((x iff y) or (y iff z)) if x or: (x iff y) or ((y iff z) if x) if you can give me a spot on this section of Boolean algebra. and I really will appreciate it if you gave me steps on how to simplify it. and had to say that I already tried a lot, solved a lot, tried wolfram alpha and others too even compared the results using truth tables but get different results and didn't know the right one from them. thanks in advance for your helping

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• Voice Communication over TCP/IP

  - by Micha

  Hello, I'm currently developing application using DirectSound for communication on an intranet. I've had working solution using UDP but then my boss told me he wants to use TCP/IP for some reason. I've tried to implement it in pretty much the same way as UDP, but with very little success. What I get is basically just noise. 20% of it is the recorded sound and the rest is just weird noise. My guess for the reason is that TCP needs to read all the accepted data several times until it gets the final sound I can play. Now two questions: Am I on the right tracks? Is it even good idea to use TCP/IP for this kind of application (voice conferencing of sorts)? I'm doing it in C# but I don't think this is language specific.

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• Generating C++ BackTraces in OS/X (10.5.7)

  - by phillipwei

  I've been utilizing backtrace and backtrace_symbols to generate programmatic stack traces for the purposes of logging/diagnosis. It seems to roughly work, however, I'm getting a little bit of mangling and there are no accompanying file/line numbers associated with each function invocation (as I'd expect within a gdb bt call or something). Here's an example: 1 leonardo 0x00006989 _ZN9ExceptionC2E13ExceptionType + 111 2 leonardo 0x00006a20 _ZN9ExceptionC1E13ExceptionType + 24 3 leonardo 0x0000ab64 _ZN5Rules11ApplyActionER16ApplicableActionR9GameState + 1060 4 leonardo 0x0000ed15 _ZN9Simulator8SimulateEv + 2179 5 leonardo 0x0000eec9 _ZN9Simulator8SimulateEi + 37 6 leonardo 0x00009729 main + 45 7 leonardo 0x000025c6 start + 54 Anything I'm missing something, doing something silly, or is this all I can expect out of backtrace on OS/X? Some other tidbits: I don't see a rdynamic link option for the g++ version (4.0.1) I'm using. -g/-g3 doesn't make any difference. abi::__cxa__demangle doesn't seem to do anything

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• .NET AxWebBrowser can't open page "Navigation to the webpage was canceled" error

  - by Erdnod

  Oh, I am stuck again on this quiet annoying problem. I am trying to do a little automated browsing using the axWebBrowser component and it worked before. Now all of a sudden I get the following message when I try to browse to a page. Navigation to the webpage was canceled What you can try: Refresh the page. I totally disabled my firewall, ran VS2008 in Administrator mode, I even installed IE8 all to no avail. By the way IE8 doesn't work either. I don't know if the problem is related but all I get when I put a URL into IE8 is this message. Internet Explorer cannot display the webpage I don't so much mind that, I just really need to get my visual studio axWebBrowser working.

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• Injecting an XML fragment into the current document from an external file

  - by makenai

  I'm currently parsing an XML file using REXML and trying to come up with a way of inserting an XML fragment from an internal file. Currently, I'm using some logic like the following: doc.elements.each('//include') do |element| handleInclude( element ) end def handleInclude( element ) if filename = element.attributes['file'] data = File.open( filename ).read doc = REXML::Document.new( data ) element.parent.replace_child( element, doc ) end end Where my XML looks like the following: <include file="test.xml" /> But this seems a little bit clunky, and I'm worried that REXML might not always parse XML fragments correctly due to absence of a proper root node in some cases. Is there a better way of doing this? Concern #2: REXML seems not to pick up my changes after I replace elements. For example, after making a change: doc.elements.each('rootNode/*') do |element| end ..picks up neither the original element I replaced, nor the one I replaced it with. Is there some trick to getting REXML to rescan its' tree?

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• Convert mediawiki to LaTeX syntax

  - by Amit Kumar

  I need to convert mediawiki into LaTeX syntax. The formulas should stay the same, but I need to transform, for example = something = into \chapter{something}. Although this can be obtained with a bit of sed, things get a little dirty with the itemize environment, so I was wondering if a better solution can be produced. Anything that can be useful for this task ? This is the reverse of this question (graciously copied). Pandoc was the answer to that question, but probably not yet for this.

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• Depth First Search Basics

  - by cam

  I'm trying to improve my current algorithm for the 8 Queens problem, and this is the first time I'm really dealing with algorithm design/algorithms. I want to implement a depth-first search combined with a permutation of the different Y values described here: http://en.wikipedia.org/wiki/Eight_queens_puzzle#The_eight_queens_puzzle_as_an_exercise_in_algorithm_design I've implemented the permutation part to solve the problem, but I'm having a little trouble wrapping my mind around the depth-first search. It is described as a way of traversing a tree/graph, but does it generate the tree graph? It seems the only way that this method would be more efficient only if the depth-first search generates the tree structure to be traversed, by implementing some logic to only generate certain parts of the tree. So essentially, I would have to create an algorithm that generated a pruned tree of lexigraphic permutations. I know how to implement the pruning logic, but I'm just not sure how to tie it in with the permutation generator since I've been using next_permutation. Is there any resources that could help me with the basics of depth first searches or creating lexigraphic permutations in tree form?

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• jQuery tooltips on a dynamically generated page.

  - by Kyle Sevenoaks

  Him I'm trying to add a jQuery tooltip to a dynamically generated list, the text I want to display the tooltip on is in a table, so my CSS tooltip doesn't work: CSS tooltip. I tried to add this jQuery tooltip to the page, it works on my local test page, but I think the problem has something to do with uniqur ids, and I'm not sure how to implement the bind all function explained there: "To bind all of the targets to their corresponding content, it takes only one line: $(".tooltip-target").ezpz_tooltip(); Calling ezpz_tooltip() on a class will bind the hover event to each element, and because of the naming convention it will know which content to display." Can someone help me to understand what exactly I have to do to make this work on a dynamic page? The page is Euroworker's checkout product page. (You'll have to add some items to the basket, click the home button on the left of the bnav bar and click the little white button "kjøp" then the orange button "handlevogn".) Thanks.

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• Problem Using Partial View In for each loop

  - by leen3o

  I'm a little confused here, I am trying use a partial view in a for each loop like so <% foreach (var item in (IEnumerable<MVCLD.Models.Article>)ViewData["LatestWebsites"]){%> <% Html.RenderPartial("articlelisttemaple", item); %> <% } %> And my partial view looks like this <div class="listingholders"> <h4><%=Html.ActionLink(item.ArticleTitle, "details", "article", new { UrlID = item.UrlID, ArticleName = item.ArticleTitle.ToString().niceurl() }, null)%> </h4> <p><%= Html.Encode(item.ArticleSnippet) %></p> <div class="clearer">&nbsp;</div> </div> But when I run the project I get told the partial view doesn't understand what item is?? CS0103: The name 'item' does not exist in the current context I can't see why it would be doing this as I'm passing item into the partial view?

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• What are the best uses for each programming language?

  - by VirtuosiMedia

  I come from a web developer background, so I'm fairly familiar with PHP and JavaScript, but I'd eventually like to branch out into other languages. At this point, I don't have a particular direction or platform that I'm leaning toward as far as learning a new language or what I would use it for, but I would like to learn a little bit more about programming languages in general and what each one is used for. I've often heard (and I agree) that you should use the right tool for the job, so what jobs are each programming language best suited for? Edit: If you've worked with some of the newer or more obscure languages, please share for those as well.

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• How do you fix the Silverlight application shift that occurs in the Firefox browser?

  - by Roy

  Hi, Currently I have an Silverlight application that when run on Firefox browser (ver 3.6) the entire contents of the Silverlight application shifts a little, and also the scrollbars on both the bottom and the side appear when I first use it. This does not happen in IE 8. How can I fix this in Firefox so it doesn't happen? The project type I created was the "Silverlight 3 Application + Website" via Expression Blend 3. This the code I am using in my MainPage.xaml: <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="StackoverflowExample.MainPage" Width="640" Height="480"> <Grid x:Name="LayoutRoot" Background="Green"> <Rectangle Fill="#FFBB2020" Stroke="Black" Margin="155,58,266,178"/> <Button Margin="199,180,302,236" Content="Button"/> </Grid> </UserControl>

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• fileinfo and mime types I've never heard of

  - by Jim

  I'm not a stranger to mime types but this is strange. Normally, a text file would have been considered to be of text/plain mime but now, after implementing fileinfo, this type of file is now considered to be "text/x-pascal". I'm a little concerned because I need to be sure that I get the correct mime types set before allowing users to upload with it. Is there a cheat sheet that will give me all of the "common" mimes as they are interpreted by fileinfo? Sinan provided a link that lists all of the more common mimes. If you look at this list, you will see that a .txt file is of text/plain mime but in my case, a plain-jane text file is interpreted as text/pascal.

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• Using the stadard Java logging, is it possible to restart logs after a certain period?

  - by Fry

  I have some java code that will be running as an importer for data for a much larger project. The initial logging code was done with the java.util.logging classes, so I'd like to keep it if possible, but it seems to be a little inadequate now given he amount of data passing through the importer. Often times in the system, the importer will get data that the main system doesn't have information for or doesn't match the system's data so it is ignored but a message is written to the log about what information was dropped and why it wasn't imported. The problem is that this tends to grow in size very quickly, so we'd like to be able to start a fresh log daily or weekly. Does anybody have an idea if this can be done in the logging classes or would I have to switch to log4j or custom? Thanks for any help!

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• Showing edittext obliquely in android

  - by Chandra Sekhar

  I have an EditText, which generally shows parallel to the screen X-axis. I want to show it obliquely (around 45 degree to horizontal axis). Is it possible to do this in Android. Please guide me in a direction so that I can try for it. After getting the two links in the answer by pawelzeiba, I proceed a little bit in solving this, but stuck again so I put another question on this. here is the link. So please help me to solve this.

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• Redirect away from HTTPS with ASP.NET MVC App

  - by Amadiere

  I'm using ASP.NET MVC 2 and have a login page that is secured via HTTPS. To ensure that the user always accesses those pages via SSL, I've added the attribute [RequiresHttps] to the controller. This does the job perfectly. When they have successfully logged in, I'd like to redirect them back to HTTP version. However, there isn't a [RequiresHttp] attribute and I'm struggling to get my head around how I might achieve this. The added (potential) complication is that the website when in production is hosted at the route of the domain, but for development and testing purposes it is within a sub directory / virtual directory / application. Am I over-thinking this and is there an easy solution staring me in the face? Or is it a little more complex?

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• Shell script to process files

  - by Harish

  I need to write a Shell Script to process a huge folder of nearly 20 levels.I have to process each and every file and check which files contain lines like select insert update When I mean line it should take the line till I find a semicolon in that file. I should get a result like this C:/test.java select * from dual C:/test.java select * from test C:/test1.java select * from tester C:/test1.java select * from dual and so on.Right now I have a script to read all the files #!bin/ksh FILE=<FILEPATH to be traversed> TEMPFILE=<Location of Temp file> cd $FILE for f in `find . ! -type d`; do cat $FILE/addedText.txt>>$TEMPFILE/newFile.txt cat $f>>$TEMPFILE/newFile.txt rm $f cat $TEMPFILE/newFile.txt>>$f rm $TEMPFILE/newFile.txt done I have very little knowledge of awk and sed to proceed further in reading each file and achieve what I want to.Can anyone help me in this

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• How do I protect myself?

  - by ved

  I was poking around at my work computer this evening and was looking at my timesheets. I noticed that all my timesheets had variables in the URLs and I could figure out the numbering scheme for the pages. Then I got a little curious about SQL injection and thought of trying out adding simple SQL injections like "OR 1=1" etc. to see how protected we really were with our timesheet info. One of these strings yielded a friendly error page saying that an error email was sent to the developer. I am concerned that my ID, and request will be seen by the developer , immediately recognized as SQL injection and will be reported to network security officer as a malicious attempt by an employee to hack the timesheet dB. what is my defense? I am really worried.

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• How to handle multiple delegates

  - by mac_55

  I've got a view in my app that does pretty much everything, and I like it that way. The problem however is that it's implementing 5 or 6 different delegates, which seems a little bit messy. My question is, does the view controller have to implement all of the delegates? or is there some way I can separate the code out into different files (without having to do a major restructure or rewrite)? Here's all the delegates I'm implementing: @interface MyView : UIViewController <UIScrollViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIActionSheetDelegate, MFMailComposeViewControllerDelegate>

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• Define variable in variable/parameter and use in javascript?

  - by Ross

  I want to defined a variable/parameter in CSS and access it by javascript. What is the best way of doing this? One option I thought of would be to place a cutsom attribute on the body element, then access that attribute via jQuery. A little more info: I'm defining colour sets in CSS. I've created a function with RaphaelJS to draw a gradient background on the page. I want this function to use a highlight colour (which is not used elsewhere on the DOM) which will be defined in the CSS along with the other colour elements. Thanks

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• VBS Script for modifying multi-value Active Directory display specifier

  - by sh-beta

  Following the howto Extending the Active Directory Schema To Track Custom Info I'm able to setup a single-value schema attribute that is easily changeable via a context menu in ADUC. Multi-value schema attributes get considerably more complicated. Say (for the sake of argument) my value is "Projects" and each user may be a list as many projects as necessary. Following is a sad little script that will set Project to a single value: Dim oproject Dim oUser1 Dim temp1 Set oproject = Wscript.Arguments Set oUser1 = GetObject(oproject(0)) temp1 = InputBox("Project: " & oUser1.project & vbCRLF & vbCRLF & "Project") if temp1 <> "" then oUser1.Put "project",temp1 oUser1.SetInfo Set oUser1 = Nothing Set oproject = Nothing Set temp1 = Nothing WScript.Quit How can I modify this to allow, assign, and modify multiple values?

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• Storing a list of objects in GAE

  - by Dominic Bou-Samra

  I need to store some data that looks a little like this: xyz 123 abc 456 hij 678 rer 838 Now I would just store it as a traditional string and integer model, and put in the datastore. But the data changes regularly, and is ONLY relevant when looked at as a COLLECTION. So it needs to be store as either a list of lists, or a list of objects, both of which can't really be done without pickling as far as I know. Can anyone help? Even storing it as a text file may work :S

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• getSelection() by Double Click or manual selection is not the same

  - by sanceray3

  Hi all, I allow me to ask a question, because I have a little probleme with an function which returns me the parent of a selection. $('input[type=button].btn_transform').click(function(){ var selectionObj = getSelected();//Function which gives me selection var theParent=selectionObj.anchorNode.parentNode; alert (theParent); }) For example with this sentence : "the cat is <strong>gray</strong>." If I select manually the word "gray" and click on my button, the function returns me [object HTMLSpanElement]. But if I select the same word by double clicking, the function returns me [object HTMLParagraphElement]. Do you know why ? Thanks a lot.

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• Best method to compress JSON string in term of performance and compress radio

  - by Eric Yin

  For a JSON string, contains all kinds of settings, numbers, string etc. Total JSON string fairly fall into 10k~50K range. I want to compress it before save to database. So I wonder which compress method should I choose, I am using c# 4, I know I can choose gzip and deflate but the compression radio is not good (although speed is good). More specific, compress can be a little slow (since only once) but should be small. Decompress should be lighting fast since decompress happens lots. Please give some advice.

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• Elegant setup of Python logging in Django

  - by Parand

  I have yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple: Different log handlers for different events - that is, I want to be able to log to different files Easy access to loggers in my modules. The module should be able to find its logger with little effort. Should be easily applicable to command-line modules. Parts of the system are stand-alone command line or daemon processes. Logging should be easily usable with these modules. My current setup is to use a logging.conf file and setup logging in each module I log from. It doesn't feel right. Do you have a logging setup that you like? Please detail it: how do you setup the configuration (do you use logging.conf or set it up in code), where/when do you initiate the loggers, and how do you get access to them in your modules, etc.

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