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• Composite Primary and Cardinality

  - by srini.venigalla

  I have some questions on Composite Primary Keys and the cardinality of the columns. I searched the web, but did not find any definitive answer, so I am trying again. The questions are: Context: Large (50M - 500M rows) OLAP Prep tables, not NOSQL, not Columnar. MySQL and DB2 1) Does the order of keys in a PK matter? 2) If the cardinality of the columns varies heavily, which should be used first. For example, if I have CLIENT/CAMPAIGN/PROGRAM where CLIENT is highly cardinal, CAMPAIGN is moderate, PROGRAM is almost like a bitmap index, what order is the best? 3) What order is the best for Join, if there is a Where clause and when there is no Where Clause (for views) Thanks in advance.

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• Best way to deallocate an array of array in javascript

  - by andre.dias

  What is the best way to deallocate an array of array in javascript to make sure no memory leaks will happen? var foo = new Array(); foo[0] = new Array(); foo[0][0] = 'bar0'; foo[0][1] = 'bar1'; foo[1] = new Array(); ... delete(foo)? iterate through foo, delete(foo[index]) and delete(foo)? 1 and 2 give me the same result? none?

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• How to GZIP my JS und CSS Files

  - by Fincha

  Hello everyone, I habe a Problem, I have to gzip a prototype Lib, but i totaly have no idea how to do this, where to start und how does it works :) I find some tutorials but that wasn't helpfull... So I have a folder with my JS Files /compressed/js/ 1.js 2.js 3.js I caling this files for a test in this file /compresses/index.php <link rel="javascript" type="text/js" href="js/tabs.js" /> <link rel="javascript" type="text/js" href="js/fb.js" /> So what I have to do? :)

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• Grab only 2 items from Jquery Loop

  - by Bry4n

  Here is my Jquery $th.each(function(idx) { var notSelected = $(this).text(); if ((notSelected.indexOf(to) != -1) || (notSelected.indexOf(from) != -1)) { if (idx < 10) { $(this).show(); // and show its corresponding td $td.eq(idx).show(); } } }); It is part of a tableFilter type function for a HTML table. However I want it to only display only 2 of the results. I tried instantiating some kind of index counter but I was unsuccessful. Any help or thoughts would be appreciated.

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• Flex: change item Style on certain Tree based ItemRenderers

  - by Markus

  Hi Everybody, I have a question concerning Tree items. I want to show where a drop action would be placed... The item will be placed in between two existing elements. So what I want to do is, to take the upper item and draw a line underneath it. But I struggling to address the itemRenderer... I have the index for the itemrenderer, but I dont get a instance of that object. Any help is appreciated! Markus

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• ASP.NET MVC View Not posting back to Post method and expecting a parameterless Constructor?

  - by VJ

  Hi, I am trying to post back some data using a viewmodel i have created and it works for me for one of the projects.But I am doin this right now public ActionResult Foo(string userkey) { vm.Value="Xvalue"; return View(vm); } [HttpPost] public ActionResult Foo( MyViewModel vm) { // process input if (inputOK) string value=vm.Value return RedirectToAction("Index"); return View(); } public class MyViewModel { public string Value { get; set; } public SomeClass newobj {get;set;} } public class SomeClass { public int id{get;set;} public string str{get;set;} } So it on debugging never goes into the parameter method for Post although on the view i have added a form and a button that submits and the page inherits from the viewmodel.I get an error saying it expects a parameterless constructor how do I fix this ? . I wrote an post method with no parameters and it does go into that method

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• ASP .NET MVC Secure all resources

  - by Tim

  How to enable Authentication on whole controller and disable only for certain action methods. I want authentication for all resources. If I write something like that: [Authorize] public class HomeController : BaseController { //This is public [UnAuthorized] public ActionResult Index() { ViewData["Message"] = "Welcome to ASP.NET MVC!"; return View(); } //This is private resource public ActionResult PrivateResource() { return View(); } } Then anyone can access this resource. Do you have any ideas how to make it better way?

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• How to avoid Black Screen on starting an application

  - by ganesh

  hi, When i start my application initially ,i get a black screen which stays for a few seconds before my main activity starts.In case of iphone an image with name default is displayed for that split second.I am not sure how to do the same in android.Any help .I tried as below in vain <activity android:name=".Index" android:label="@string/app_name" android:screenOrientation="portrait" android:theme="@drawable/defaultimage"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>

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• Algorithm to find the smallest snippet from searching a document?

  - by deliciousirony

  I've been going through Skiena's excellent "The Algorithm Design Manual" and got hung up on one of the exercises. The question is: "Given a search string of three words, find the smallest snippet of the document that contains all three of the search words—i.e. , the snippet with smallest number of words in it. You are given the index positions where these words in occur search strings, such as word1: (1, 4, 5), word2: (4, 9, 10), and word3: (5, 6, 15). Each of the lists are in sorted order, as above." Anything I come up with is O(n^2)... This question is in the "Sorting and Searching" chapter, so I assume there is a simple and clever way to do it. I'm trying something with graphs right now, but that seems like overkill. Ideas? Thanks

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• How to make django test framework read from live database?

  - by lfborjas

  I realize there's a similar question here, but this one has a different approach: I have a django app that does queries over data indexed with djapian ; I'd like to write unit tests for this app's search component, and, obviously, I'd need the django settings module and all connections with the database active, so the test runner that django provides seems ideal. however, the django testing framework creates a dummy database and I'd hate to dump all my data to a fixture and then index it (the tests would take forever!); My data isn't at risk because the tests would only read from the database, so, how could this be achieved? -I'm new at this whole unit testing thing, so the solution of writing a new test runner I read in that similar question doesn't enlighten me a bit, at least not without some details

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• how do i insert spaces into a string using the range function?

  - by user1319219

  If I have a string, for example which reads: 'Hello how are you today Joe' How am I able to insert spaces into it at regular intervals? So for example I want to insert spaces into it using the range function in these steps: range(0,27,2). So it will look like this: 'He lo ho w ar e yo u to da y Jo e' It now has a space at every 2nd index going up to it's end. How do I do this does anyone know? thanks.

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• Better Alternative to Telerik Draggable Panel ?

  - by user284523

  When putting a video in a Telerik Draggable Panel, when dragging the panel, on Firefox the video restart all over again because DOM is reconstructed. They don't seem to have an answer to this. Also we can't seem to be able to control the z-index as it doesn't take into account: when moving the panel over other telerik controls, the video slips under. So any other draggable panel that wouldn't have these annoyances ? Telerik doesn't seem to give any answer so we're afraid we're stuck and we cannot afford to wait longer. Currently think about using Yahoo UI.

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• Organizing a random list of objects in Python.

  - by Saebin

  So I have a list that I want to convert to a list that contains a list for each group of objects. ie ['objA.attr1', 'objC', 'objA.attr55', 'objB.attr4'] would return [['objA.attr1', 'objA.attr55'], ['objC'], ['objB.attr4']] currently this is what I use: givenList = ['a.attr1', 'b', 'a.attr55', 'c.attr4'] trgList = [] objNames = [] for val in givenList: obj = val.split('.')[0] if obj in objNames: id = objNames.index(obj) trgList[id].append(val) else: objNames.append(obj) trgList.append([val]) #print trgList It seems to run a decent speed when the original list has around 100,000 ids... but I am curious if there is a better way to do this. Order of the objects or attributes does not matter. Any ideas?

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• ASP.NET C# Application Object Getters and Setters

  - by kellax

  I have had a hard time finiding a newbie friendly example of accessing Application Object. I have few things ( arrays ) i would like to store in Application Object to keep as persistant data for about 2h till AppRecycle Anyhow i know how to set an Application Object variable this way: // One way String[] users = new String[1000]; Application["users"] = users; // Another way Application.Add("users", users); However i do not know how to access these variables once in Application Object there is a Getter method Get however it requires int index and other one Contents which get's everything. Here i try to retrive my String[] array but gives me a error that i am trying to convert Object to String. String[] usersTable = Application["users"]; // Since this is an object i also tried Application.users but gives error

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• Need ILMerge hint

  - by lakhlaniprashant.blogspot.com

  Hi all, I'm trying to merge vintasoft barcode sdk with my data access dll and it's not working after ilmerge. Any ideas are welcome here is the error: IndexOutOfRangeException: Index was outside the bounds of the array.] 2.+.©(Byte[] param0) in :0 2.+..cctor() in :0 [TypeInitializationException: The type initializer for '2.+' threw an exception.] 2.+.¥S() in :0 Vintasoft.Barcode.WriterSettings..cctor() in :0 [TypeInitializationException: The type initializer for 'Vintasoft.Barcode.WriterSettings' threw an exception.] Vintasoft.Barcode.WriterSettings..ctor() in :0 Vintasoft.Barcode.BarcodeWriter..ctor() in :0 _Default.buttonGenerateBarcode_Click(Object sender, EventArgs e) in E:\ILMergeSample\WebBarcodeWriterDemo\QRBarcode.aspx.vb:27 System.EventHandler.Invoke(Object sender, EventArgs e) +0 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565 Thanks in advance

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• How to make a table view which can be scrolled for ever?

  - by mystify

  I have a set of 100 rows, pretty similar to values which can be selected in a picker. When the user scrolls the table, I want the rows to be appended like an forever-ongoing assembly-belt. So when the user scrolls down and reaches the row 100, and scrolls even further, the table view will show again row 1, and so on. Reverse direction same thing. My thoughts: don't display scroll indicators (they would make not much sense, probably) what value to return in the numberOfRows delegate method? This infinity constant? in cellForRowAtIndexPath: simply wrap the index around when it exceeds bounds?

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• Implications of Fulltext Search over many columns

  - by Alex

  Hello, I have a really wide table which includes separate columns for billing address, shipping address, primary address, names, aliases etc. (I can't normalize this table further, and that's not the question here anyways). I'm implementing SQL Server fulltext search, and I'm wondering whether I should limit the search ability to just the primary fields (primary address and names for example), or if I can extend the search ability across all columns without occurring too much of a performance or memory penalty. I've done some basic testing with 10,000 sample rows and it's quite fast but I don't have much experience with fulltext indexing, especially its dictionary internals, so I don't know if the index is going to grow over time, or if there is anything else to consider. Thoughts?

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• How can we make a single dimension array to multidimensional Hierarchical ?

  - by Chetan sharma

  I have an single array of Hierarchical categories. Index of the array is the category_id like:: [8846] => Array ( [category_id] => 8846 [title] => Tsting two [description] => Tsting two [subtype] => categories [type] => object [level] => 2 [parent_category] => 8841 [tags] => new [name] => Tsting two ) each value has its parent_category value, I have around 500 elements in the array, what is the best way to make it. Process i followed: krsort categories array, so that all the child categories are at the beginning, then function makeHierarchical() { foreach($this->categories as $guid => $category) { if($category['level'] != 1) $this->multilevel_categories[$category['parent_category']][$guid] = $category; } } but this is not working, it does it only for first level. Can someone point out me the error.

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• Online audio stream using ruby on rails

  - by Avdept

  I'm trying to write small website that can stream audio online(radio station) and got few questions: 1. Do i have to index all my music files into database, or i can randomily pick file from file system and play it. 2. When should i use ajax to load new song(right after last finished, or few seconds before to get responce from server with link to file?) 3. Is it worth to use ajax, or better make list, that will play its full time and then start over?

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• How to automate testing of a browser-based app?

  - by mawg

  If it were a windows program, I would use Auto it to automate testing. Is there something similar for browser-based apps? Nothing too complex, it should just allow scripting (preferable for me to macro-recording) to simulate human interaction with the browser, which means being able to identify fields of a form by name, inject text into some, simulate mouse-click on others, etc and then, after submitting a form, should be able to read text certain named controls, check the status of others (checked, radio group index, read-only, etc). While I do appreciate a full featured product, I don't appreciate a steep learning curve. so something as simple as the scripting of Auto It woudl be fine. I don't know if it makes a difference which browser is used, but I could live with MSIE 6 or higher (maybe 7 or higher at a push).

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• ListView is Widget(View) or Layout(Viewgroup)?

  - by Manoj Maurya

  Hi All, I need your help to explore few topics in Android. My understanding is Widget is View and Layout is ViewGroups in Android. I described the problems as below- Please go through the below links- developer.android.com/guide/topics/ui/custom-components.html- (add http:// in the beginning) developer.android.com/resources/tutorials/views/index.html - (add http:// in the beginning) In the first link ListView is included as Widget and in the Second link ListView has been shown as Layout. So, is ListView is Widget(View) or Layout(Viewgroup)? Same is the case for Spinner in Andriod developer.android.com/resources/tutorials/views/hello-spinner.html- (add http:// in the beginning) (Link- says Spinner is Widget(View)) developer.android.com/guide/topics/ui/layout-objects.html- (add http:// in the beginning) says Spinner is Layout(ViewGroup) So, Spinner is View or ViewGroup? Please update me with your views?

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• Solr Vs. Sphinx in a Ruby project

  - by Robert Ross

  I have a project that is being written on top of the Grape API framework in ruby. (https://github.com/intridea/grape) The problem I'm having is that Thinking-Sphinx vs. Sunspot (Gems used to interface with each search index) have worlds different benchmarks. View the Benchmark Here We're trying to develop something that is quick and easy to deploy (Solr needs Java). The issues we see right now is mainly that Solr is slower through Sunspot gem and Sphinx is faster through Thinking-Sphinx because Solr is HTTP REST calls where Sphinx is sockets. Anyone have any experience in either and can explain pitfalls / bonuses? Note: Needs to be deployable to Rails AND non-rails apps (Hence Sunspot). Thanks!

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• Rails is caching when I don't want it to. Why?

  - by ryeguy

  Rails is caching the index method of one of my controllers. It's a very simple application and only has like 2 controllers and a handful of actions each. The weird thing is I don't have any caching in my application at all, at least not explicitly. The pages get uncached if I restart passenger. Does rails do some kind of automatic page caching? There are no files in the public directory The page is returning a 200 header I have no caching blocks in my views (I use haml, if that matters) I have no action, controller, or page caching defined The request is hitting rails, verified by the production log I have the following in my production.rb: config.cache_classes = true config.action_controller.consider_all_requests_local = false config.action_controller.perform_caching = true config.action_view.cache_template_loading = true

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• Using JavaScript to change the URL used when a page is bookmarked...

  - by user30997

  JavaScript doesn't allow you to update window.location without triggering a reload. While I agree with this policy in principle (it shouldn't be possible to visit my website and have JavaScript change the location bar to read www.yourbankingsite.com,) I believe that it should be possible to change www.foo.org/index to www.foo.org/help. The only reason I care about this is for bookmarking. I'm working on a photo browser, and when a user is previewing a particular image, I want that image to be the default if they should bookmark that page. For example, if they are viewing foo.org/preview/images0-30 and they click on image #15, that image is expanded to a medium-sized view. If they then bookmark the page, I want the bookmark URL to be foo.org/preview/images0-30/active15. Any thoughts, or is there a security barrier on this one as well? I can certainly understand the same policy being applied here, but one can dream.

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• Mod Rewrite - Simple Question

  - by bob

  This is my current .htaccess Options +FollowSymLinks DirectoryIndex index.php RewriteEngine On RewriteBase /product/ RewriteCond %{ENV:REDIRECT_STATUS} ^$ RewriteRule ^(.+)\.php$ ./$1/ [R=301,L] RewriteCond %{SCRIPT_FILENAME} !-f RewriteRule [^/]$ %{REQUEST_URI}/ [R=301,L] RewriteRule ^contact/?$ ./contact.php [QSA,L] Everything is working fine now.. /product/contact return to /product/contact/ /product/contact.php return to /product/contact/ Question.. How to make all my .php will be /contact/ /help/ /faq/ Now I should to add contact.php help.php faq.php to the htaccess I tried to add RewriteRule ^(.*)/$ $1.php [QSA,L] but it will be return loop. Let me know how to fix it ;)

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