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• Search engine solution for Django that actually works?

  - by prometheus

  The story so far: Decided to go with Xapian as search backend because it has all search-engine features I was looking for, knows about Unicode, stemming, has few dependencies and requires no bloated app-server installation on top of it. Tried Django and Haystack (plus xapian-haystack, the backend glue code to tie Haystack to Xapian) because it was advertised on quite some blogs as "working". Did not work. Neither django-haystack nor the xapian-haystack project provide a version combination that actually works together. MASTER from both projects yields an error from Xapian, so it's not stable at all. Haystack 1.0.1 and xapian-haystack 1.0.x/1.1.0 are not API-compatible. Plus, in a minimally working installation of Haystack 1.0.1 and xapian-haystack MASTER, any complex query yields zero results due to errors in either django-haystack or xapian-haystack (I double-verified this), maybe because the unit-tests actually test very simple cases, and no edge-cases at all. Tried Djapian. The source-code is riddled with spelling errors (mind you, in variable names, not comments), documentation is also riddled with ambiguities and outdated information that will never lead to a working installation. Not surprisingly, users rarely ask for features but how to get it working in the first place. Next on the plate: exploring Solr (installing a Java environment plus Tomcat gives me headaches, the machine is RAM- and CPU-constrained), or Lucene (slightly less headaches, but still). Before I proceed spending more time with a solution that might or might not work as advertised, I'd like to know: Did anyone ever get an actual, real-world search solution working in Django? I'm serious. I find it really frustrating reading about "large problems mostly solved", and then realizing that you will never get a working installation from the source-code because, actually, all bloggers dealing with those "mostly solved problems" never went past basic installation and copy-pasting the official tutorials. So here are the requirements: must be able to search for 10-100 terms in one query must handle + (term must be present) and - (term must not be present), AND/OR must handle arbitrary grouping (i.e. parentheses around AND/OR) must allow for Django-ORM filtering before or after fulltext-search (i.e. pre-/post-processing of results with the full set of filters that Django knows about) alternatively, there must be a facility to bulk-fetch the result set and transform it into a QuerySet should be light on the machine, so preferably no humongous JVM and Java-based app-server installation Is there anything out there that does this? I'm not interested in anecdotal evidence, or references to some blog posts that claim it should be working. I'd like to hear from someone who actually has a fully-functional setup working in the real world, under real conditions, with real queries. EDIT: Let me repeat again that I'm not so much interested in anecdotal evidence that someone, somewhere has a somewhat running installation working with unspecified properties. I already went there, I read all the blog posts, mailing lists, I contacted the authors, but when it came to actual implementation of real-world scenarios, nothing ever worked as advertised. Also, and a user below brought that point up as well, considering the TCO of any project, I'm definitely not interested in hearing that someone, somewhere was able to pull it off once a vendor parachuted in an unknown number of specialists to monkey-patch the whole installation with specific domain-knowledge that's documented nowhere. So, please, if you claim you have a working installation that actually satisfies minimum requirements for a full-fledged search (see requirements above), please provide the following so that we can all benefit from a search solution for Django that actually solves the problem: exact Linux distribution, release version, exact release version of Haystack (or equivalent) and release version of search backend, exact release version of the search engine publicly (!) available documentation how to set up all components exactly in the way that your installation was set up such that the minimal requirements above are met. Thank you.

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• Search engine solution for Django that actually works?

  - by prometheus

  The story so far: Decided to go with Xapian as search backend because it has all search-engine features I was looking for, knows about Unicode, stemming, has few dependencies and requires no bloated app-server installation on top of it. Tried Django and Haystack (plus xapian-haystack, the backend glue code to tie Haystack to Xapian) because it was advertised on quite some blogs as "working". Did not work. Neither django-haystack nor the xapian-haystack project provide a version combination that actually works together. MASTER from both projects yields an error from Xapian, so it's not stable at all. Haystack 1.0.1 and xapian-haystack 1.0.x/1.1.0 are not API-compatible. Plus, in a minimally working installation of Haystack 1.0.1 and xapian-haystack MASTER, any complex query yields zero results due to errors in either django-haystack or xapian-haystack (I double-verified this), maybe because the unit-tests actually test very simple cases, and no edge-cases at all. Tried Djapian. The source-code is riddled with spelling errors (mind you, in variable names, not comments), documentation is also riddled with ambiguities and outdated information that will never lead to a working installation. Not surprisingly, users rarely ask for features but how to get it working in the first place. Next on the plate: exploring Solr (installing a Java environment plus Tomcat gives me headaches, the machine is RAM- and CPU-constrained), or Lucene (slightly less headaches, but still). Before I proceed spending more time with a solution that might or might not work as advertised, I'd like to know: Did anyone ever get an actual, real-world search solution working in Django? I'm serious. I find it really frustrating reading about "large problems mostly solved", and then realizing that you will never get a working installation from the source-code because, actually, all bloggers dealing with those "mostly solved problems" never went past basic installation and copy-pasting the official tutorials. So here are the requirements: must be able to search for 10-100 terms in one query must handle + (term must be present) and - (term must not be present), AND/OR must handle arbitrary grouping (i.e. parentheses around AND/OR) must allow for Django-ORM filtering before or after fulltext-search (i.e. pre-/post-processing of results with the full set of filters that Django knows about) alternatively, there must be a facility to bulk-fetch the result set and transform it into a QuerySet should be light on the machine, so preferably no humongous JVM and Java-based app-server installation Is there anything out there that does this? I'm not interested in anecdotal evidence, or references to some blog posts that claim it should be working. I'd like to hear from someone who actually has a fully-functional setup working in the real world, under real conditions, with real queries. EDIT: Let me repeat again that I'm not so much interested in anecdotal evidence that someone, somewhere has a somewhat running installation working with unspecified properties. I already went there, I read all the blog posts, mailing lists, I contacted the authors, but when it came to actual implementation of real-world scenarios, nothing ever worked as advertised. Also, and a user below brought that point up as well, considering the TCO of any project, I'm definitely not interested in hearing that someone, somewhere was able to pull it off once a vendor parachuted in an unknown number of specialists to monkey-patch the whole installation with specific domain-knowledge that's documented nowhere. So, please, if you claim you have a working installation that actually satisfies minimum requirements for a full-fledged search (see requirements above), please provide the following so that we can all benefit from a search solution for Django that actually solves the problem: exact Linux distribution, release version, exact release version of Haystack (or equivalent) and release version of search backend, exact release version of the search engine publicly (!) available documentation how to set up all components exactly in the way that your installation was set up such that the minimal requirements above are met. Thank you.

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• can't properly shutdown ubuntu and sound problem on HP mini 311 netbook

  - by Viele

  hi, I recently bought a HP mini 311 netbook. I replaced its harddrive and installed ubuntu 10.04. Since then, I have encountered some very strange problem with its sound and shutdown/reboot. At times, when I start the computer, it will have no sound, on the GUI the sound is at max, but no sound is available. This sometimes also happen after after upgrades, hibernate, and toggling the wireless radio button. Strangely, when the sound is out the device will also refuse to be shutdown. If I shutdown the computer using the GUI, it will simply go back to the log in screen without actually shutting down. If I use "sudo shutdown 0", the computer will hang on the loading screen of the shut down process. I had to force the pc to shutdown by holding the power button down. usually (probably always) after I force a turn-off then start off again. the sound and shutdown become normal. I wonder if anyone have clues regarding to the cause of this problem. This the info about the computer: 1) installed ubuntu 10.04LTS RC, later upgraded to formal released version. 2) cat /proc/asound/version == "Advanced Linux Sound Architecture Driver Version 1.0.21." however, when doing 'alsaconf' the version displayed is 1.0.23 any help is appreciated. Thanks

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• Unable to launch onscreen keyboard (osk.exe) from a 32-bit process on Win7 x64

  - by Steven Robbins

  90% of the time I am unable to launch osk.exe from a 32bit process on Win7 x64. Originally the code was just using: Process.Launch("osk.exe"); Which won't work on x64 because of the directory virtualization. Not a problem I thought, I'll just disable virtualization, launch the app, and enable it again, which I thought was the correct way to do things. I also added some code to bring the keyboard back up if it has been minimized (which works fine) - the code (in a sample WPF app) now looks as follows: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation;using System.Diagnostics; using System.Runtime.InteropServices; namespace KeyboardTest { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { [DllImport("kernel32.dll", SetLastError = true)] private static extern bool Wow64DisableWow64FsRedirection(ref IntPtr ptr); [DllImport("kernel32.dll", SetLastError = true)] public static extern bool Wow64RevertWow64FsRedirection(IntPtr ptr); private const UInt32 WM_SYSCOMMAND = 0x112; private const UInt32 SC_RESTORE = 0xf120; [DllImport("user32.dll", CharSet = CharSet.Auto)] static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam); private string OnScreenKeyboadApplication = "osk.exe"; public MainWindow() { InitializeComponent(); } private void KeyboardButton_Click(object sender, RoutedEventArgs e) { // Get the name of the On screen keyboard string processName = System.IO.Path.GetFileNameWithoutExtension(OnScreenKeyboadApplication); // Check whether the application is not running var query = from process in Process.GetProcesses() where process.ProcessName == processName select process; var keyboardProcess = query.FirstOrDefault(); // launch it if it doesn't exist if (keyboardProcess == null) { IntPtr ptr = new IntPtr(); ; bool sucessfullyDisabledWow64Redirect = false; // Disable x64 directory virtualization if we're on x64, // otherwise keyboard launch will fail. if (System.Environment.Is64BitOperatingSystem) { sucessfullyDisabledWow64Redirect = Wow64DisableWow64FsRedirection(ref ptr); } // osk.exe is in windows/system folder. So we can directky call it without path using (Process osk = new Process()) { osk.StartInfo.FileName = OnScreenKeyboadApplication; osk.Start(); osk.WaitForInputIdle(2000); } // Re-enable directory virtualisation if it was disabled. if (System.Environment.Is64BitOperatingSystem) if (sucessfullyDisabledWow64Redirect) Wow64RevertWow64FsRedirection(ptr); } else { // Bring keyboard to the front if it's already running var windowHandle = keyboardProcess.MainWindowHandle; SendMessage(windowHandle, WM_SYSCOMMAND, new IntPtr(SC_RESTORE), new IntPtr(0)); } } } } But this code, most of the time, throws the following exception on osk.Start(): The specified procedure could not be found at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo) I've tried putting long Thread.Sleep commands in around the osk.Start line, just to make sure it wasn't a race condition, but the same problem persists. Can anyone spot where I'm doing something wrong, or provide an alternative solution for this? It seems to work fine launching Notepad, it just won't play ball with the onscreen keyboard.

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• How does VS 2005 provide history across all TFS Team Projects when tf.exe cannot?

  - by AakashM

  In Visual Studio 2005, in the TFS Source Control Explorer, these is a top-level node for the TFS Server itself, with a child node for each Team Project. Right-clicking either the server node or the node for a Team Project gives a context menu on which there is a View History item. Selecting this gives you a History window showing the last 200 or so changesets, either for the specific Team Project chosen, or across all Team Projects. It is this history across all Team Projects that I am wondering about. The command-line tf.exe history command provides (as I understand it) basically the same functionality as is provided by the VS TFS Source Control plug-in. But I cannot work out how to get tf.exe history to provide this across-all-Team-Projects history. At a command line, supposing I have C:\ mapped as the root of my workspace, and Foo, Bar, and Baz as Team Projects, I can do C:\> tf history Foo /recursive /stopafter:200 to get the last 200 changesets that affected Team Project Foo; or from within a Team Project folder C:\Bar> tf history *.* /recursive /stopafter:200 which does the same thing for Team Project Bar - note that the wildcard *.* is allowed here. However, none of these work (each gives the error message shown): C:\> tf history /recursive /stopafter:200 The history command takes exactly one item C:\> tf history *.* /recursive /stopafter:200 Unable to determine the source control server C:\> tf history *.* /server:servername /recursive /stopafter:200 Unable to determine the workspace I don't see an option in the docs for tf for specifying a workspace; it seems to only want to determine it from the current folder. So what is VS 2005 doing? Is it internally doing a history on each Team Project in turn and then sticking the results together?? note also that I have tried with Power Tools; tfpt history from the command line gives exactly the same error messages seen here

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• jquery Uncaught SyntaxError: Unexpected token )

  - by js00831

  I am getting a jquery error in my code... can you guys tell me whats the reason for this when you click the united states red color button in this link you will see this error http://jsfiddle.net/SSMX4/88/embedded/result/ function checkCookie(){ var cookie_locale = readCookie('desired-locale'); var show_blip_count = readCookie('show_blip_count'); var tesla_locale = 'en_US'; //default to US var path = window.location.pathname; // debug.log("path = " + path); var parsed_url = parseURL(window.location.href); var path_array = parsed_url.segments; var path_length = path_array.length var locale_path_index = -1; var locale_in_path = false; var locales = ['en_AT', 'en_AU', 'en_BE', 'en_CA', 'en_CH', 'de_DE', 'en_DK', 'en_GB', 'en_HK', 'en_EU', 'jp', 'nl_NL', 'en_US', 'it_IT', 'fr_FR', 'no_NO'] // see if we are on a locale path $.each(locales, function(index, value){ locale_path_index = $.inArray(value, path_array); if (locale_path_index != -1) { tesla_locale = value == 'jp' ? 'ja_JP':value; locale_in_path = true; } }); // debug.log('tesla_locale = ' + tesla_locale); cookie_locale = (cookie_locale == null || cookie_locale == 'null') ? false:cookie_locale; // Only do the js redirect on the static homepage. if ((path_length == 1) && (locale_in_path || path == '/')) { debug.log("path in redirect section = " + path); if (cookie_locale && (cookie_locale != tesla_locale)) { // debug.log('Redirecting to cookie_locale...'); var path_base = ''; switch (cookie_locale){ case 'en_US': path_base = path_length > 1 ? path_base:'/'; break; case 'ja_JP': path_base = '/jp' break; default: path_base = '/' + cookie_locale; } path_array = locale_in_path != -1 ? path_array.slice(locale_in_path):path_array; path_array.unshift(path_base); window.location.href = path_array.join('/'); } } // only do the ajax call if we don't have a cookie if (!cookie_locale) { // debug.log('doing the cookie check for locale...') cookie_locale = 'null'; var get_data = {cookie:cookie_locale, page:path, t_locale:tesla_locale}; var query_country_string = parsed_url.query != '' ? parsed_url.query.split('='):false; var query_country = query_country_string ? (query_country_string.slice(0,1) == '?country' ? query_country_string.slice(-1):false):false; if (query_country) { get_data.query_country = query_country; } $.ajax({ url:'/check_locale', data:get_data, cache: false, dataType: "json", success: function(data){ var ip_locale = data.locale; var market = data.market; var new_locale_link = $('#locale_pop #locale_link'); if (data.show_blip && show_blip_count < 3) { setTimeout(function(){ $('#locale_msg').text(data.locale_msg); $('#locale_welcome').text(data.locale_welcome); new_locale_link[0].href = data.new_path; new_locale_link.text(data.locale_link); new_locale_link.attr('rel', data.locale); if (!new_locale_link.hasClass(data.locale)) { new_locale_link.addClass(data.locale); } $('#locale_pop').slideDown('slow', function(){ var hide_blip = setTimeout(function(){ $('#locale_pop').slideUp('slow', function(){ var show_blip_count = readCookie('show_blip_count'); if (!show_blip_count) { createCookie('show_blip_count',1,360); } else if (show_blip_count < 3 ) { var b_count = show_blip_count; b_count ++; eraseCookie('show_blip_count'); createCookie('show_blip_count',b_count,360); } }); },10000); $('#locale_pop').hover(function(){ clearTimeout(hide_blip); },function(){ setTimeout(function(){$('#locale_pop').slideUp();},10000); }); }); },1000); } } }); } }

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• CryptoExcercise Encryption/Decryption Problem

  - by venkat

  I am using apples "cryptoexcercise" (Security.Framework) in my application to encrypt and decrypt a data of numeric value. When I give the input 950,128 the values got encrypted, but it is not getting decrypted and exists with the encrypted value only. This happens only with the mentioned numeric values. Could you please check this issue and give the solution to solve this problem? here is my code (void)testAsymmetricEncryptionAndDecryption { uint8_t *plainBuffer; uint8_t *cipherBuffer; uint8_t *decryptedBuffer; const char inputString[] = "950"; int len = strlen(inputString); if (len > BUFFER_SIZE) len = BUFFER_SIZE-1; plainBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t)); cipherBuffer = (uint8_t *)calloc(CIPHER_BUFFER_SIZE, sizeof(uint8_t)); decryptedBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t)); strncpy( (char *)plainBuffer, inputString, len); NSLog(@"plain text : %s", plainBuffer); [self encryptWithPublicKey:(UInt8 *)plainBuffer cipherBuffer:cipherBuffer]; NSLog(@"encrypted data: %s", cipherBuffer); [self decryptWithPrivateKey:cipherBuffer plainBuffer:decryptedBuffer]; NSLog(@"decrypted data: %s", decryptedBuffer); free(plainBuffer); free(cipherBuffer); free(decryptedBuffer); } (void)encryptWithPublicKey:(uint8_t *)plainBuffer cipherBuffer:(uint8_t *)cipherBuffer { OSStatus status = noErr; size_t plainBufferSize = strlen((char *)plainBuffer); size_t cipherBufferSize = CIPHER_BUFFER_SIZE; NSLog(@"SecKeyGetBlockSize() public = %d", SecKeyGetBlockSize([self getPublicKeyRef])); // Error handling // Encrypt using the public. status = SecKeyEncrypt([self getPublicKeyRef], PADDING, plainBuffer, plainBufferSize, &cipherBuffer[0], &cipherBufferSize ); NSLog(@"encryption result code: %d (size: %d)", status, cipherBufferSize); NSLog(@"encrypted text: %s", cipherBuffer); } (void)decryptWithPrivateKey:(uint8_t *)cipherBuffer plainBuffer:(uint8_t *)plainBuffer { OSStatus status = noErr; size_t cipherBufferSize = strlen((char *)cipherBuffer); NSLog(@"decryptWithPrivateKey: length of buffer: %d", BUFFER_SIZE); NSLog(@"decryptWithPrivateKey: length of input: %d", cipherBufferSize); // DECRYPTION size_t plainBufferSize = BUFFER_SIZE; // Error handling status = SecKeyDecrypt([self getPrivateKeyRef], PADDING, &cipherBuffer[0], cipherBufferSize, &plainBuffer[0], &plainBufferSize ); NSLog(@"decryption result code: %d (size: %d)", status, plainBufferSize); NSLog(@"FINAL decrypted text: %s", plainBuffer); } (SecKeyRef)getPublicKeyRef { OSStatus sanityCheck = noErr; SecKeyRef publicKeyReference = NULL; if (publicKeyRef == NULL) { NSMutableDictionary *queryPublicKey = [[NSMutableDictionary alloc] init]; // Set the public key query dictionary. [queryPublicKey setObject:(id)kSecClassKey forKey:(id)kSecClass]; [queryPublicKey setObject:publicTag forKey:(id)kSecAttrApplicationTag]; [queryPublicKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType]; [queryPublicKey setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnRef]; // Get the key. sanityCheck = SecItemCopyMatching((CFDictionaryRef)queryPublicKey, (CFTypeRef *)&publicKeyReference); if (sanityCheck != noErr) { publicKeyReference = NULL; } [queryPublicKey release]; } else { publicKeyReference = publicKeyRef; } return publicKeyReference; } (SecKeyRef)getPrivateKeyRef { OSStatus resultCode = noErr; SecKeyRef privateKeyReference = NULL; if(privateKeyRef == NULL) { NSMutableDictionary * queryPrivateKey = [[NSMutableDictionary alloc] init]; // Set the private key query dictionary. [queryPrivateKey setObject:(id)kSecClassKey forKey:(id)kSecClass]; [queryPrivateKey setObject:privateTag forKey:(id)kSecAttrApplicationTag]; [queryPrivateKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType]; [queryPrivateKey setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnRef]; // Get the key. resultCode = SecItemCopyMatching((CFDictionaryRef)queryPrivateKey, (CFTypeRef *)&privateKeyReference); NSLog(@"getPrivateKey: result code: %d", resultCode); if(resultCode != noErr) { privateKeyReference = NULL; } [queryPrivateKey release]; } else { privateKeyReference = privateKeyRef; } return privateKeyReference; }

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• GWT Html Layout Conventions

  - by brad

  I've just started working with GWT and I'm already recognizing the extraordinary power that it possesses. I'm coming from a frontend world so the Java is a big learning curve, but I think that will actually help me build a properly laid out app (html-wise) instead of just relying on the default GWT panels that often end up using tables for layout, or superfluous, absolutely positioned divs. The biggest thing slowing me down right now however is deciding how to properly lay out the design of my site. I've got a pretty standard 2-col header/foot site (fixed width) that I want to design, but I'm not a fan of all the extra divs/styling etc that come with the DockLayoutPanel for instance. I'm thinking that I should just write my own Layout widget extending Composite that has HTMLPanels for the general site layout (I think... still haven't fully figured that out yet, ie. how do I add ID's to these panel divs "#header", "#nav" etc...) then I can add other widgets into this layout But the other thing I'm seeing is that I could write a Layout class extending UiBuilder and have straight up divs in the ui.xml file. I'm just wondering, what is the preferred method for site layout with GWT? This isn't going to be re-used in the sense of other widgets, it will be used once and my controls etc will be placed inside. Any tips or tricks are greatly appreciated! And if I've completely missed the boat on how to do this, let me know

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• Slow queries in Rails- not sure if my indexes are being used.

  - by Max Williams

  I'm doing a quite complicated find with lots of includes, which rails is splitting into a sequence of discrete queries rather than do a single big join. The queries are really slow - my dataset isn't massive, with none of the tables having more than a few thousand records. I have indexed all of the fields which are examined in the queries but i'm worried that the indexes aren't helping for some reason: i installed a plugin called "query_reviewer" which looks at the queries used to build a page, and lists problems with them. This states that indexes AREN'T being used, and it features the results of calling 'explain' on the query, which lists various problems. Here's an example find call: Question.paginate(:all, {:page=>1, :include=>[:answers, :quizzes, :subject, {:taggings=>:tag}, {:gradings=>[:age_group, :difficulty]}], :conditions=>["((questions.subject_id = ?) or (questions.subject_id = ? and tags.name = ?))", "1", 19, "English"], :order=>"subjects.name, (gradings.difficulty_id is null), gradings.age_group_id, gradings.difficulty_id", :per_page=>30}) And here are the generated sql queries: SELECT DISTINCT `questions`.id FROM `questions` LEFT OUTER JOIN `taggings` ON `taggings`.taggable_id = `questions`.id AND `taggings`.taggable_type = 'Question' LEFT OUTER JOIN `tags` ON `tags`.id = `taggings`.tag_id LEFT OUTER JOIN `subjects` ON `subjects`.id = `questions`.subject_id LEFT OUTER JOIN `gradings` ON gradings.question_id = questions.id WHERE (((questions.subject_id = '1') or (questions.subject_id = 19 and tags.name = 'English'))) ORDER BY subjects.name, (gradings.difficulty_id is null), gradings.age_group_id, gradings.difficulty_id LIMIT 0, 30 SELECT `questions`.`id` AS t0_r0 <..etc...> FROM `questions` LEFT OUTER JOIN `answers` ON answers.question_id = questions.id LEFT OUTER JOIN `quiz_questions` ON (`questions`.`id` = `quiz_questions`.`question_id`) LEFT OUTER JOIN `quizzes` ON (`quizzes`.`id` = `quiz_questions`.`quiz_id`) LEFT OUTER JOIN `subjects` ON `subjects`.id = `questions`.subject_id LEFT OUTER JOIN `taggings` ON `taggings`.taggable_id = `questions`.id AND `taggings`.taggable_type = 'Question' LEFT OUTER JOIN `tags` ON `tags`.id = `taggings`.tag_id LEFT OUTER JOIN `gradings` ON gradings.question_id = questions.id LEFT OUTER JOIN `age_groups` ON `age_groups`.id = `gradings`.age_group_id LEFT OUTER JOIN `difficulties` ON `difficulties`.id = `gradings`.difficulty_id WHERE (((questions.subject_id = '1') or (questions.subject_id = 19 and tags.name = 'English'))) AND `questions`.id IN (602, 634, 666, 698, 730, 762, 613, 645, 677, 709, 741, 592, 624, 656, 688, 720, 752, 603, 635, 667, 699, 731, 763, 614, 646, 678, 710, 742, 593, 625) ORDER BY subjects.name, (gradings.difficulty_id is null), gradings.age_group_id, gradings.difficulty_id SELECT count(DISTINCT `questions`.id) AS count_all FROM `questions` LEFT OUTER JOIN `answers` ON answers.question_id = questions.id LEFT OUTER JOIN `quiz_questions` ON (`questions`.`id` = `quiz_questions`.`question_id`) LEFT OUTER JOIN `quizzes` ON (`quizzes`.`id` = `quiz_questions`.`quiz_id`) LEFT OUTER JOIN `subjects` ON `subjects`.id = `questions`.subject_id LEFT OUTER JOIN `taggings` ON `taggings`.taggable_id = `questions`.id AND `taggings`.taggable_type = 'Question' LEFT OUTER JOIN `tags` ON `tags`.id = `taggings`.tag_id LEFT OUTER JOIN `gradings` ON gradings.question_id = questions.id LEFT OUTER JOIN `age_groups` ON `age_groups`.id = `gradings`.age_group_id LEFT OUTER JOIN `difficulties` ON `difficulties`.id = `gradings`.difficulty_id WHERE (((questions.subject_id = '1') or (questions.subject_id = 19 and tags.name = 'English'))) Actually, looking at these all nicely formatted here, there's a crazy amount of joining going on here. This can't be optimal surely. Anyway, it looks like i have two questions. 1) I have an index on each of the ids and foreign key fields referred to here. The second of the above queries is the slowest, and calling explain on it (doing it directly in mysql) gives me the following: +----+-------------+----------------+--------+---------------------------------------------------------------------------------+-------------------------------------------------+---------+------------------------------------------------+------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+----------------+--------+---------------------------------------------------------------------------------+-------------------------------------------------+---------+------------------------------------------------+------+----------------------------------------------+ | 1 | SIMPLE | questions | range | PRIMARY,index_questions_on_subject_id | PRIMARY | 4 | NULL | 30 | Using where; Using temporary; Using filesort | | 1 | SIMPLE | answers | ref | index_answers_on_question_id | index_answers_on_question_id | 5 | millionaire_development.questions.id | 2 | | | 1 | SIMPLE | quiz_questions | ref | index_quiz_questions_on_question_id | index_quiz_questions_on_question_id | 5 | millionaire_development.questions.id | 1 | | | 1 | SIMPLE | quizzes | eq_ref | PRIMARY | PRIMARY | 4 | millionaire_development.quiz_questions.quiz_id | 1 | | | 1 | SIMPLE | subjects | eq_ref | PRIMARY | PRIMARY | 4 | millionaire_development.questions.subject_id | 1 | | | 1 | SIMPLE | taggings | ref | index_taggings_on_taggable_id_and_taggable_type,index_taggings_on_taggable_type | index_taggings_on_taggable_id_and_taggable_type | 263 | millionaire_development.questions.id,const | 1 | | | 1 | SIMPLE | tags | eq_ref | PRIMARY | PRIMARY | 4 | millionaire_development.taggings.tag_id | 1 | Using where | | 1 | SIMPLE | gradings | ref | index_gradings_on_question_id | index_gradings_on_question_id | 5 | millionaire_development.questions.id | 2 | | | 1 | SIMPLE | age_groups | eq_ref | PRIMARY | PRIMARY | 4 | millionaire_development.gradings.age_group_id | 1 | | | 1 | SIMPLE | difficulties | eq_ref | PRIMARY | PRIMARY | 4 | millionaire_development.gradings.difficulty_id | 1 | | +----+-------------+----------------+--------+---------------------------------------------------------------------------------+-------------------------------------------------+---------+------------------------------------------------+------+----------------------------------------------+ The query_reviewer plugin has this to say about it - it lists several problems: Table questions: Using temporary table, Long key length (263), Using filesort MySQL must do an extra pass to find out how to retrieve the rows in sorted order. To resolve the query, MySQL needs to create a temporary table to hold the result. The key used for the index was rather long, potentially affecting indices in memory 2) It looks like rails isn't splitting this find up in a very optimal way. Is it, do you think? Am i better off doing several find queries manually rather than one big combined one? Grateful for any advice, max

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• Automatically install and launch a code-signed application from Safari

  - by Thomas Jung

  Is it possible and if so what are the steps necessary to package (or build) a Mac OS X application and code-sign it so that it can be downloaded with Safari and automatically launch? ... possibly after the user responds to some sort of dialog explaining that it is a signed application and the publisher has been verified. An example of the user experience I am trying to create is "installing Google Chrome for the first time on Windows", which is a 3-click, less-than-a-minute process. For the concerned among you: I am not trying to create a drive-by download. I am fine with some sort of intermittent user step approving the download. I just want to make the installation as quick and painless as possible and not require the user drag the app from a mounted DMG into the application folder. This may not 100% jibe with established Mac OS X user interaction guidelines, but it would work better for the not-power users. I only need the high-level steps or pointers to resources ... my google-fu was weak on this one.

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• NHibernate Mapping and Querying Where Tables are Related But No Foreign Key Constraint

  - by IanT8

  I'm fairly new to NHibernate, and I need to ask a couple of questions relating to a very frequent scenario. The following simplified example illustrates the problem. I have two tables named Equipment and Users. Users is a set of system administrators. Equipment is a set of machinery. Tables: Users table has UserId int and LoginName nvarchar(64). Equipment table has EquipId int, EquipType nvarchar(64), UpdatedBy int. Behavior: System administrators can make changes to Equipment, and when they do, the UpdatedBy field of Equipment is "normally" set to their User Id. Users can be deleted at any time. New Equipment items have an UpdatedBy value of null. There's no foreign key constraint on Equipment.UpdatedBy which means: Equipment.UpdatedBy can be null. Equipment.UpdatedBy value can be = existing User.UserId value Equipment.UpdatedBy value can be = non-existent User.UserId value To find Equipment and who last updated the Equipment, I might query like this: select E.EquipId, E.EquipName, U.UserId, U.LoginName from Equipment E left outer join Users U on. E.UpdatedBy = U.UserId Simple enough. So how to do that in NHibernate? My mappings might be as follows: <?xml version="1.0" encoding="utf-8"?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Data" assembly="Data"> <class name="User" table="Users"> <id name="Id" column="UserId" unsaved-value="0"> <generator class="native" /> </id> <property name="LoginName" unique="true" not-null="true" /> </class> <class name="Equipment" table="Equipment"> <id name="Id" column="EquipId" type="int" unsaved-value="0"> <generator class="native" /> </id> <property name="EquipType" /> <many-to-one name="UpdatedBy" class="User" column="UpdatedBy" /> </class> </hibernate-mapping> So how do I get all items of equipment and who updated them? using (ISession session = sessionManager.OpenSession()) { List<Data.Equipment> equipList = session .CreateCriteria<Data.Equipment>() // Do I need to SetFetchmode or specify that I // want to join onto User here? If so how? .List<Data.Equipment>(); foreach (Data.Equipment item in equipList) { Debug.WriteLine("\nEquip Id: " + item.Id); Debug.WriteLine("Equip Type: " + item.EquipType); if (item.UpdatedBy.Country != null) Debug.WriteLine("Updated By: " + item.UpdatedBy.LoginName); else Debug.WriteLine("Updated by: Nobody"); } } When Equipment.UpdatedBy = 3 and there is no Users.UserId = 3, the above fail I also have a feeling that the generated SQL is a select all from Equipment followed by many select columns from Users where UserId = n whereas I'd expected NHibernate to left join as per my plain ordinary SQL and do one hit. If I can tell NHibernate to do the query in one hit, how do I do that? Time is of the essence on my project, so any help you could provide is gratefully received. If you're speculating about how NHibernate might work in this scenario, please say you're not absolutely sure. Many thanks.

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• Merging: hg/git vs. svn

  - by stmax

  I often read that hg (and git and...) are better at merging than svn but I have never seen practical examples of where hg/git can merge something where svn fails (or where svn needs manual intervention). Could you post a few step-by-step lists of branch/modify/commit/...-operations that show where svn would fail while hg/git happily moves on? Practical, not highly exceptional cases please... Some background: we have a few dozen developers working on projects using svn, with each project (or group of similar projects) in its own repo. We know how to apply release- and feature-branches so we don't run into problems very often (i.e. we've been there, but we've learned to overcome joel's problems of "one programmer causing trauma to the whole team" or "needing six developers for two weeks to reintegrate a branch"). We have release-branches that are very stable and only used to apply bugfixes. We have trunks that should be stable enough to be able to create a release within one week. And we have feature-branches that single developers or groups of developers can work on. Yes, they are deleted after reintegration so they don't clutter up the repository. ;) So I'm still trying to find the advantages of hg/git over svn. I'd love to get some hands-on experience, but there aren't any bigger projects we could move to hg/git yet, so I'm stuck with playing with small artifical projects that only contain a few made up files. And I'm looking for a few cases where you can feel the impressive power of hg/git, since so far I have often read about them but failed to find them myself.

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• Eager/Lazy loaded member always empty with JPA one-to-many relationship

  - by Kaleb Pederson

  I have two entities, a User and Role with a one-to-many relationship from user to role. Here's what the tables look like: mysql> select * from User; +----+-------+----------+ | id | name | password | +----+-------+----------+ | 1 | admin | admin | +----+-------+----------+ 1 row in set (0.00 sec) mysql> select * from Role; +----+----------------------+---------------+----------------+ | id | description | name | summary | +----+----------------------+---------------+----------------+ | 1 | administrator's role | administrator | Administration | | 2 | editor's role | editor | Editing | +----+----------------------+---------------+----------------+ 2 rows in set (0.00 sec) And here's the join table that was created: mysql> select * from User_Role; +---------+----------+ | User_id | roles_id | +---------+----------+ | 1 | 1 | | 1 | 2 | +---------+----------+ 2 rows in set (0.00 sec) And here's the subset of orm.xml that defines the tables and relationships: <entity class="User" name="User"> <table name="User" /> <attributes> <id name="id"> <generated-value strategy="AUTO" /> </id> <basic name="name"> <column name="name" length="100" unique="true" nullable="false"/> </basic> <basic name="password"> <column length="255" nullable="false" /> </basic> <one-to-many name="roles" fetch="EAGER" target-entity="Role" /> </attributes> </entity> <entity class="Role" name="Role"> <table name="Role" /> <attributes> <id name="id"> <generated-value strategy="AUTO"/> </id> <basic name="name"> <column name="name" length="40" unique="true" nullable="false"/> </basic> <basic name="summary"> <column name="summary" length="100" nullable="false"/> </basic> <basic name="description"> <column name="description" length="255"/> </basic> </attributes> </entity> Yet, despite that, when I retrieve the admin user, I get back an empty collection. I'm using Hibernate as my JPA provider and it shows the following debug SQL: select user0_.id as id8_, user0_.name as name8_, user0_.password as password8_ from User user0_ where user0_.name=? limit ? When the one-to-many mapping is lazy loaded, that's the only query that's made. This correctly retrieves the one admin user. I changed the relationship to use eager loading and then the following query is made in addition to the above: select roles0_.User_id as User1_1_, roles0_.roles_id as roles2_1_, role1_.id as id9_0_, role1_.description as descript2_9_0_, role1_.name as name9_0_, role1_.summary as summary9_0_ from User_Role roles0_ left outer join Role role1_ on roles0_.roles_id=role1_.id where roles0_.User_id=? Which results in the following results: +----------+-----------+--------+----------------------+---------------+----------------+ | User1_1_ | roles2_1_ | id9_0_ | descript2_9_0_ | name9_0_ | summary9_0_ | +----------+-----------+--------+----------------------+---------------+----------------+ | 1 | 1 | 1 | administrator's role | administrator | Administration | | 1 | 2 | 2 | editor's role | editor | Editing | +----------+-----------+--------+----------------------+---------------+----------------+ 2 rows in set (0.00 sec) Hibernate obviously knows about the roles, yet getRoles() still returns an empty collection. Hibernate also recognized the relationship sufficiently to put the data in the first place. What problems can cause these symptoms?

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• Grafting LINQ onto C# 2 library

  - by P Daddy

  I'm writing a data access layer. It will have C# 2 and C# 3 clients, so I'm compiling against the 2.0 framework. Although encouraging the use of stored procedures, I'm still trying to provide a fairly complete ability to perform ad-hoc queries. I have this working fairly well, already. For the convenience of C# 3 clients, I'm trying to provide as much compatibility with LINQ query syntax as I can. Jon Skeet noticed that LINQ query expressions are duck typed, so I don't have to have an IQueryable and IQueryProvider (or IEnumerable<T>) to use them. I just have to provide methods with the correct signatures. So I got Select, Where, OrderBy, OrderByDescending, ThenBy, and ThenByDescending working. Where I need help are with Join and GroupJoin. I've got them working, but only for one join. A brief compilable example of what I have is this: // .NET 2.0 doesn't define the Func<...> delegates, so let's define some workalikes delegate TResult FakeFunc<T, TResult>(T arg); delegate TResult FakeFunc<T1, T2, TResult>(T1 arg1, T2 arg2); abstract class Projection{ public static Condition operator==(Projection a, Projection b){ return new EqualsCondition(a, b); } public static Condition operator!=(Projection a, Projection b){ throw new NotImplementedException(); } } class ColumnProjection : Projection{ readonly Table table; readonly string columnName; public ColumnProjection(Table table, string columnName){ this.table = table; this.columnName = columnName; } } abstract class Condition{} class EqualsCondition : Condition{ readonly Projection a; readonly Projection b; public EqualsCondition(Projection a, Projection b){ this.a = a; this.b = b; } } class TableView{ readonly Table table; readonly Projection[] projections; public TableView(Table table, Projection[] projections){ this.table = table; this.projections = projections; } } class Table{ public Projection this[string columnName]{ get{return new ColumnProjection(this, columnName);} } public TableView Select(params Projection[] projections){ return new TableView(this, projections); } public TableView Select(FakeFunc<Table, Projection[]> projections){ return new TableView(this, projections(this)); } public Table Join(Table other, Condition condition){ return new JoinedTable(this, other, condition); } public TableView Join(Table inner, FakeFunc<Table, Projection> outerKeySelector, FakeFunc<Table, Projection> innerKeySelector, FakeFunc<Table, Table, Projection[]> resultSelector){ Table join = new JoinedTable(this, inner, new EqualsCondition(outerKeySelector(this), innerKeySelector(inner))); return join.Select(resultSelector(this, inner)); } } class JoinedTable : Table{ readonly Table left; readonly Table right; readonly Condition condition; public JoinedTable(Table left, Table right, Condition condition){ this.left = left; this.right = right; this.condition = condition; } } This allows me to use a fairly decent syntax in C# 2: Table table1 = new Table(); Table table2 = new Table(); TableView result = table1 .Join(table2, table1["ID"] == table2["ID"]) .Select(table1["ID"], table2["Description"]); But an even nicer syntax in C# 3: TableView result = from t1 in table1 join t2 in table2 on t1["ID"] equals t2["ID"] select new[]{t1["ID"], t2["Description"]}; This works well and gives me identical results to the first case. The problem is if I want to join in a third table. TableView result = from t1 in table1 join t2 in table2 on t1["ID"] equals t2["ID"] join t3 in table3 on t1["ID"] equals t3["ID"] select new[]{t1["ID"], t2["Description"], t3["Foo"]}; Now I get an error (Cannot implicitly convert type 'AnonymousType#1' to 'Projection[]'), presumably because the second join is trying to join the third table to an anonymous type containing the first two tables. This anonymous type, of course, doesn't have a Join method. Any hints on how I can do this?

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• TSQL Shred XML - Is this right or is there a better way (newbie @ shredding XML)

  - by drachenstern

  Ok, I'm a C# ASP.NET dev following orders: The orders are to take a given dataset, shred the XML and return columns. I've argued that it's easier to do the shredding on the ASP.NET side where we already have access to things like deserializers, etc, and the entire complex of known types, but no, the boss says "shred it on the server, return a dataset, bind the dataset to the columns of the gridview" so for now, I'm doing what I was told. This is all to head off the folks who will come along and say "bad requirements". Task at hand: Here's my code that works and does what I want it to: DECLARE @table1 AS TABLE ( ProductID VARCHAR(10) , Name VARCHAR(20) , Color VARCHAR(20) , UserEntered VARCHAR(20) , XmlField XML ) INSERT INTO @table1 SELECT '12345','ball','red','john','<sizes><size name="medium"><price>10</price></size><size name="large"><price>20</price></size></sizes>' INSERT INTO @table1 SELECT '12346','ball','blue','adam','<sizes><size name="medium"><price>12</price></size><size name="large"><price>25</price></size></sizes>' INSERT INTO @table1 SELECT '12347','ring','red','john','<sizes><size name="medium"><price>5</price></size><size name="large"><price>8</price></size></sizes>' INSERT INTO @table1 SELECT '12348','ring','blue','adam','<sizes><size name="medium"><price>8</price></size><size name="large"><price>10</price></size></sizes>' INSERT INTO @table1 SELECT '23456','auto','black','ann','<auto><type>car</type><wheels>4</wheels><doors>4</doors><cylinders>3</cylinders></auto>' INSERT INTO @table1 SELECT '23457','auto','black','ann','<auto><type>truck</type><wheels>4</wheels><doors>2</doors><cylinders>8</cylinders></auto><auto><type>car</type><wheels>4</wheels><doors>4</doors><cylinders>6</cylinders></auto>' DECLARE @x XML SELECT @x = ( SELECT ProductID , Name , Color , UserEntered , XmlField.query(' for $vehicle in //auto return <auto type = "{$vehicle/type}" wheels = "{$vehicle/wheels}" doors = "{$vehicle/doors}" cylinders = "{$vehicle/cylinders}" />') FROM @table1 table1 WHERE Name = 'auto' FOR XML AUTO ) SELECT @x SELECT ProductID = T.Item.value('../@ProductID', 'varchar(10)') , Name = T.Item.value('../@Name', 'varchar(20)') , Color = T.Item.value('../@Color', 'varchar(20)') , UserEntered = T.Item.value('../@UserEntered', 'varchar(20)') , VType = T.Item.value('@type' , 'varchar(10)') , Wheels = T.Item.value('@wheels', 'varchar(2)') , Doors = T.Item.value('@doors', 'varchar(2)') , Cylinders = T.Item.value('@cylinders', 'varchar(2)') FROM @x.nodes('//table1/auto') AS T(Item) SELECT @x = ( SELECT ProductID , Name , Color , UserEntered , XmlField.query(' for $object in //sizes/size return <size name = "{$object/@name}" price = "{$object/price}" />') FROM @table1 table1 WHERE Name IN ('ring', 'ball') FOR XML AUTO ) SELECT @x SELECT ProductID = T.Item.value('../@ProductID', 'varchar(10)') , Name = T.Item.value('../@Name', 'varchar(20)') , Color = T.Item.value('../@Color', 'varchar(20)') , UserEntered = T.Item.value('../@UserEntered', 'varchar(20)') , SubName = T.Item.value('@name' , 'varchar(10)') , Price = T.Item.value('@price', 'varchar(2)') FROM @x.nodes('//table1/size') AS T(Item) So for now, I'm trying to figure out if there's a better way to write the code than what I'm doing now... (I have a part 2 I'm about to go key in)

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• Calculate shortest path through a grocery store

  - by Bart

  Hi, I'm trying to find a way to find the shortest path through a grocery store, visiting a list of locations (shopping list). The path should start at a specified startposition and can end at multiple endpositions (there are multiple checkout counters). Also, I have some predefined constraints on the path, such as "item x on the shopping list needs to be the last, second last, or third last item on the path". There is a function that will return true or false for a given path. Finally, this needs to be calculated with limited cpu power (on a smartphone) and within a second or so. If this isn't possible, then an approximation to the optimal path is also ok. Is this possible? So far I think I need to start by calculating the distance between every item on the list using something like A* or Dijkstra's. After that, should I treat it like the travelling salesman problem? Because in my problem there is a specified startnode, specified endnodes, and some constraints, which are not in the travelling salesman problem. Any help would be appreciated :)

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• CPU friendly infinite loop

  - by Adi

  Writing an infinite loop is simple: while(true){ //add whatever break condition here } But this will trash the CPU performance. This execution thread will take as much as possible from CPU's power. What is the best way to lower the impact on CPU? Adding some Thread.Sleep(n) should do the trick, but setting a high timeout value for Sleep() method may indicate an unresponsive application to the operating system. Let's say I need to perform a task each minute or so in a console app. I need to keep Main() running in an "infinite loop" while a timer will fire the event that will do the job. I would like to keep Main() with the lowest impact on CPU. What methods do you suggest. Sleep() can be ok, but as I already mentioned, this might indicate an unresponsive thread to the operating system. LATER EDIT: I want to explain better what I am looking for: I need a console app not Windows service. Console apps can simulate the Windows services on Windows Mobile 6.x systems with Compact Framework. I need a way to keep the app alive as long as the Windows Mobile device is running. We all know that the console app runs as long as its static Main() function runs, so I need a way to prevent Main() function exit. In special situations (like: updating the app), I need to request the app to stop, so I need to infinitely loop and test for some exit condition. For example, this is why Console.ReadLine() is no use for me. There is no exit condition check. Regarding the above, I still want Main() function as resource friendly as possible. Let asside the fingerprint of the function that checks for the exit condition.

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• Problem: Vectorizing Code with Intel Visual FORTRAN for X64

  - by user313209

  I'm compiling my fortran90 code using Intel Visual FORTRAN on Windows Server 2003 Enterprise X64 Edition. When I compile the code for 32 bit structure and using automatic and manual vectorizing options. The code will be compiled, vectorized. And when I run it on 8 core system the compiled code uses 70% of CPU that shows me that vectorizing is working. But when I compile the code with 64 Bit compiler, it says that the code is vectorized but when I run it it only shows CPU usage of about 12% that is full usage for one core out of 8, so it means that while the compiler says that code is vectorized, vectorization is not working. And it's strange for me because it's on a X64 Edition Windows and I was expecting to see the reverse result. I thought that it should be better to run a code that is compiled for 64 Bit architecture on a 64 bit windows. Anyone have any idea why the compiled code is not able to use the full power of multiple cores for 64 Bit Compiled version? Thanks in advance for your responses.

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• What is your workflow when designing HTML/CSS layouts?

  - by DMin

  I have been working with PHP/MySQL as a hobby for close to a couple of years now, I have been working with photoshop for a very long time, I know CSS & HTML well enough to write without any reference, so, I would not consider myself someone who's very new at this. I have recently started developing websites professionally - (only person working on the project). I have seen the power of Joomla and how you can make a website ready for your customer in a matter of hours(if not minutes). I find it very hard to make layouts that remotely look like the themes on joomla. I find making even simple layouts a very cumbersome process and takes a lot of time to get a good enough output. I have a feeling I may not be using the right tools or workflow for the job. What I wanted to findout was, as part of the industry : How do, you, make your website when you do it from scratch? What are the tools that you use? What is your workflow? Just noted a few things I know already, for your reference(You can skip this if you like) I have seen the export for web for Photoshop that exports CSS - but (as far as I know) exports only absolutely positioned webpages so they need to be beaten and fixed if you want to use them for example for joomla. I have used the SiteGrinder plugin for Photoshop that exports HTML/CSS. It looks promising but haven't tried it extensively. One of the tools that save loads of time is FireBug. This makes it easy to edit html and css on the fly and get the page looking exactly as you want it. Recently stumbled upon fireworks. But haven't explored it much. Thanks! :)

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• Dropdownlist post in ASP.NET MVC3 and Entity Framework Model

  - by Josh Blade

  I have 3 tables: RateProfile RateProfileID ProfileName Rate RateID RateProfileID PanelID Other stuff to update Panel PanelID PanelName I have models for each of these. I have an edit page using the RateProfile model. I display the information for RateProfile and also all of the Rates associated with it. This works fine and I can update it fine. However, I also added a dropdown so that I can filter Rates by PanelID. I need it to post back on change so that it can display the filtered rates. I'm using @Html.DropDownList("PanelID", (SelectList)ViewData["PanelDropDown"], new { onchange = "$('#RateForm').submit()" }) for my dropdownlist. Whenever it posts back to my HttpPost Edit method though, it seems to be missing all information about the Rates navigation property. It's weird because I thought it would do exactly what the input/submit button that I have in the form does (which actually passes the entire model back to my HttpPost Edit action and does what I want it to do). The panelID is properly being passed to my HttpPost Edit method and on to the next view, but when I try to query the Model.Rates navigation property is null (only when the post comes from the dropdown. Everything works fine when the post comes from my submit input). Get Edit: public ActionResult Edit(int id, int panelID = 1) { RateProfile rateprofile = db.RateProfiles.Single(r => r.RateProfileID == id); var panels = db.Panels; ViewData["PanelDropDown"] = new SelectList(panels, "PanelID", "PanelName", panelID); ViewBag.PanelID = panelID; return View(rateprofile); } HttpPost Edit: [HttpPost] public ActionResult Edit(RateProfile rateprofile, int panelID) { var panels = db.Panels; ViewData["PanelDropDown"] = new SelectList(panels, "PanelID", "PanelName", panelID); ViewBag.PanelID = panelID; if (ModelState.IsValid) { db.Entry(rateprofile).State = EntityState.Modified; foreach (Rate dimerate in rateprofile.Rates) { db.Entry(dimerate).State = EntityState.Modified; } db.SaveChanges(); return View(rateprofile); } return View(rateprofile); } View: @model PDR.Models.RateProfile @using (Html.BeginForm(null,null,FormMethod.Post, new {id="RateForm"})) { <div> @Html.Label("Panel") @Html.DropDownList("PanelID", (SelectList)ViewData["PanelDropDown"], new { onchange = "$('#RateForm').submit()" }) </div> @{var rates= Model.Rates.Where(a => a.PanelID == ViewBag.PanelID).OrderBy(a => a.minCount).ToList();} @for (int i = 0; i < rates.Count; i++) { <tr> <td> @Html.HiddenFor(modelItem => rates[i].RateProfileID) @Html.HiddenFor(modelItem => rates[i].RateID) @Html.HiddenFor(modelItem => rates[i].PanelID) @Html.EditorFor(modelItem => rates[i].minCount) @Html.ValidationMessageFor(model => rates[i].minCount) </td> <td> @Html.EditorFor(modelItem => rates[i].maxCount) @Html.ValidationMessageFor(model => rates[i].maxCount) </td> <td> @Html.EditorFor(modelItem => rates[i].Amount) @Html.ValidationMessageFor(model => rates[i].Amount) </td> </tr> } <input type="submit" value="Save" /> } To summarize my problem, the below query in my view only works when the post comes from the submit button and not when it comes from my dropdownlist. @{var rates= Model.Rates.Where(a => a.PanelID == ViewBag.PanelID).OrderBy(a => a.minCount).ToList();}

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• Gridview delete/edit not working when using select parameter

  - by Brian Carroll

  new to ASP.NET. I created a sqldatasource and set up basic select query (SELECT * FROM Accounts) using the wizard. I then had the sqldatasource wizard create the INSERT, EDIT and DELETE queries. Connected this datasource to a gridview with EDITING and DELETING enabled. Everything works fine. The SELECT query returns all records and I can edit/delete them. Now I need to send a parameter to the SELECT command to filter the records to those with the user's id (pulled from Membership.GetUser). When I add this parameter, the SELECT command works fine, but the EDIT/DELETE buttons in the gridview no longer work. No error is generated. The page refreshes but the records were not updated in the database. I don't understand what is wrong. CODE: <% Dim u As MembershipUser Dim userid As String u = Membership.GetUser(User.Identity.Name) userid = u.ProviderUserKey.ToString SqlDataSource1.SelectParameters("UserId").DefaultValue = userid %> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="SqlDataSource1"> <Columns> <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" /> <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" /> <asp:BoundField DataField="UserId" HeaderText="UserId" SortExpression="UserId" /> <asp:BoundField DataField="AccountName" HeaderText="AccountName" SortExpression="AccountName" /> <asp:BoundField DataField="DateAdded" HeaderText="DateAdded" SortExpression="DateAdded" /> <asp:BoundField DataField="LastModified" HeaderText="LastModified" SortExpression="LastModified" /> </Columns> </asp:GridView> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CheckingConnectionString %>" DeleteCommand="DELETE FROM [Accounts] WHERE [ID] = @ID" InsertCommand="INSERT INTO [Accounts] ([UserId], [AccountName], [DateAdded], [LastModified]) VALUES (@UserId, @AccountName, @DateAdded, @LastModified)" SelectCommand="SELECT * FROM [Accounts] WHERE [UserId] = @UserId" UpdateCommand="UPDATE [Accounts] SET [UserId] = @UserId, [AccountName] = @AccountName, [DateAdded] = @DateAdded, [LastModified] = @LastModified WHERE [ID] = @ID"> <DeleteParameters> <asp:Parameter Name="ID" Type="Int32" /> </DeleteParameters> <InsertParameters> <asp:Parameter Name="UserId" Type="String" /> <asp:Parameter Name="AccountName" Type="String" /> <asp:Parameter Name="DateAdded" Type="DateTime" /> <asp:Parameter Name="LastModified" Type="DateTime" /> </InsertParameters> <UpdateParameters> <asp:Parameter Name="UserId" Type="String" /> <asp:Parameter Name="AccountName" Type="String" /> <asp:Parameter Name="DateAdded" Type="DateTime" /> <asp:Parameter Name="LastModified" Type="DateTime" /> <asp:Parameter Name="ID" Type="Int32" /> </UpdateParameters> <SelectParameters> <asp:Parameter Name="UserId"/> </SelectParameters> </asp:SqlDataSource>

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• android & libgdx - disable blurry images rendering

  - by android developer

  i'm trying out libgdx as an opengl wrapper , and i have some issues with its graphical rendering : for some reason , all images (textures) on android device look a little blurred using libgdx . this also includes text (font) . however, for normal images , even though i show the entire image , i expect it to look as sharp as i see it on a computer , especially if i have such a good screen on the device (it's galaxy nexus) . i've tried to set the anti-aliasing off , by using the next code : final AndroidApplicationConfiguration androidApplicationConfiguration=new AndroidApplicationConfiguration(); androidApplicationConfiguration.numSamples=0; //tried the value of 1 too. ... i've also tried to set the scaling method to various methods , but with no luck. example: texture.setFilter(TextureFilter.Nearest,TextureFilter.Nearest); as a test , i've found a sharp image that is exactly the same as the seen resolution on the device (720x1184 for galaxy nexus , because of the buttons bar) , and i've put it to be on the background of the libgdx app . of course , i had to add extra blank space in order for the texute to be loaded , so the final size of the image (which will include content and empty space) is still a power of 2 for both width and height (1024x2048 in my case) . on the desktop app , it look ok . on the device , it looked blurred. a weird thing that i've noticed is that when i change the device's orientation (horizontal <= vertical) , for the very short time before the rotating animation starts , i see both the image and the text very well . can anyone please help me?

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• java class creation dynamically and make it accessible across the network different jvms i.e. serial

  - by inj.rav

  Hi. I have a requirement of creating java classes dynamically and make it accessible different jvms across the network. I tried to use reflection and javassist tool,but nothing worked. Let me explain the scenario we are using Coherence distributed cache. It has a power of doing aggregation/filtering in parallel across the cluster. For example if a class has [dynamic class] has amount variable and getAmount/setAmount methods. Then if we execute COHERENCE queries, it will start process in parallel across the cluster. I tried to create classes at run time by using javassist and reflection. I am able to access it from single JVM, but when I tried to access the same class from other jvm [through coherence cluster]. I am getting exception of class not found [as remote jvm is not having idea of this class].I can over come this by creating same class dynamically on remote jvm also and access the methods. But coherence in built methods/functions are not able to find the class. could some one help me on this matter

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• iPhone: Repeating Rows in Each Section of Grouped UITableview

  - by Rank Beginner

  I'm trying to learn how to use the UITableView in conjunction with a SQLite back end. My issue is that I've gotten the table to populate with the records from the database, however I'm having a problem with the section titles. I am not able to figure out the proper set up for this, and I'm repeating all tasks under each section. The table looks like this. The groups field is where I'm trying to pull the section title from. TaskID groups TaskName sched lastCompleted nextCompleted success 1 Household laundry 3 03/19/2010 03/22/2010 y 1 Automotive Change oil 3 03/20/2010 03/23/2010 y In my viewDidLoad Method, I create an array from each column in the table like below. //Create and initialize arrays from table columns //______________________________________________________________________________________ ids =[[NSMutableArray alloc] init]; tasks =[[NSMutableArray alloc] init]; sched =[[NSMutableArray alloc] init]; lastComplete =[[NSMutableArray alloc] init]; nextComplete =[[NSMutableArray alloc] init]; weight =[[NSMutableArray alloc] init]; success =[[NSMutableArray alloc] init]; group =[[NSMutableArray alloc] init]; // Bind them to the data //______________________________________________________________________________________ NSString *query = [NSString stringWithFormat:@"SELECT * FROM Tasks ORDER BY nextComplete "]; sqlite3_stmt *statement; if (sqlite3_prepare_v2( database, [query UTF8String], -1, &statement, nil) == SQLITE_OK) { while (sqlite3_step(statement) == SQLITE_ROW) { [ids addObject:[NSString stringWithFormat:@"%i",(int*) sqlite3_column_int(statement, 0)]]; [group addObject:[NSString stringWithFormat:@"%s",(char*) sqlite3_column_text(statement, 1)]]; [tasks addObject:[NSString stringWithFormat:@"%s",(char*) sqlite3_column_text(statement, 2)]]; [sched addObject:[NSString stringWithFormat:@"%i",(int*) sqlite3_column_int(statement, 3)]]; [lastComplete addObject:[NSString stringWithFormat:@"%s",(char*) sqlite3_column_text(statement, 4)]]; [nextComplete addObject:[NSString stringWithFormat:@"%s",(char*) sqlite3_column_text(statement, 5)]]; [success addObject:[NSString stringWithFormat:@"%s",(char*) sqlite3_column_text(statement, 6)]]; [weight addObject:[NSString stringWithFormat:@"%i",(int*) sqlite3_column_int(statement, 7)]]; } sqlite3_finalize(statement); } In the table method:cellForRowAtIndexPath, I create controls on the fly and set their text properties to objects in the array. Below is a sample, I can provide more but am already working on a book here... :) /create the task label NSString *tmpMessage; tmpMessage = [NSString stringWithFormat:@"%@ every %@ days, for %@ points",[tasks objectAtIndex:indexPath.row],[sched objectAtIndex:indexPath.row],[weight objectAtIndex:indexPath.row]]; CGRect schedLabelRect = CGRectMake(0, 0, 250, 15); UILabel *lblSched = [[UILabel alloc] initWithFrame:schedLabelRect]; lblSched.textAlignment = UITextAlignmentLeft; lblSched.text = tmpMessage; lblSched.font = [UIFont boldSystemFontOfSize:10]; [cell.contentView addSubview: lblSched]; [lblSched release]; My numberOfSectionsInTableView method looks like this // Figure out how many sections there are by a distinct count of the groups field // The groups are entered by user when creating tasks //______________________________________________________________________________________ NSString *groupquery = [NSString stringWithFormat:@"SELECT COUNT(DISTINCT groups) as Sum FROM Tasks"]; int sum; sqlite3_stmt *statement; if (sqlite3_prepare_v2( database, [groupquery UTF8String], -1, &statement, nil) == SQLITE_OK) { while (sqlite3_step(statement) == SQLITE_ROW) { sum = sqlite3_column_int(statement, 0); } sqlite3_finalize(statement); } if (sum=0) { return 1; } return 2; } I know I'm going wrong here but this is all that's in my numberOfRowsInSection method return [ids count];

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• performing authorisation/authentication between webservices

  - by mary

  Hi, i am developing webservices.In that i want to maintain state information so that all WebMethods could be access only after Login. I have tried but getting problem. I am attaching my code. Any other alternative will also be welcomed. [ WebService(Namespace = "http://amSubfah.org/")] [ WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. // [System.Web.Script.Services.ScriptService] public class Login : System.Web.Services.WebService { Message msgObj = new Message(); BaseClass b = new BaseClass(); PasswordEncryptionDecryption pedObj = new PasswordEncryptionDecryption(); public AuthHeader Authentication=new AuthHeader (); public Login () { //Uncomment the following line if using designed components //InitializeComponent(); } [ SoapHeader("Authentication", Required = true)] [System.Web.Services. WebMethod(EnableSession = true)] public string checkUserLogin(string user, string pwd) { DataSet dsLogin = new DataSet(); List sqlParams = new List(); SqlParameter sqlParam1 = new SqlParameter("@UserName", SqlDbType.NVarChar); sqlParam1.Value = user; sqlParams.Add(sqlParam1); SqlParameter sqlParam2 = new SqlParameter("@Password", SqlDbType.NVarChar); string pass = pedObj.encryptPassword(pwd); sqlParam2.Value = pass; sqlParams.Add(sqlParam2); try { b.initializeDBConnection(); dsLogin = b.execSelectLoginQuery( Query.strSelectLoginData, sqlParams); } catch (SqlException sqlEx) { string str = msgObj.msgErrorMessage + sqlEx.Message + sqlEx.StackTrace; } {if ((dsLogin != null) && (dsLogin.Tables[0].Rows.Count != 0)) { Session[ "username"] = user; string sessionId = System.Guid.NewGuid().ToString(); Authentication.sessionId = sessionId; Authentication.Username = user; return msgObj.msgLoginSuccess; } else return msgObj .msgLoginFail ; } //webmethod for registration [ SoapHeader("Authentication", Required = true)] [System .Web .Services . WebMethod (EnableSession =true )] public string insertRegistrationDetails(string fName,string lName,string email,string pwd) { //string u = Session["username"].ToString(); //if (u == "") //{ // //checkUserLogin(fName,pwd ); // return "Please login first"; //} if (Authentication.Username == null || Authentication.sessionId == null) { return "Please Login first"; } List sqlParams = new List(); int insert = 0; string msg = "" ; SqlParameter sqlParam = new SqlParameter("@FName", SqlDbType.NVarChar); sqlParam.Value = fName; sqlParam.Size = 50; sqlParams.Add(sqlParam); SqlParameter sqlParam1 = new SqlParameter("@LName", SqlDbType.NVarChar); sqlParam1.Value = lName; sqlParam1.Size = 50; sqlParams.Add(sqlParam1); SqlParameter sqlParam5 = new SqlParameter("@Email", SqlDbType.NVarChar); sqlParam5.Value = email; sqlParam5.Size = 50; sqlParams.Add(sqlParam5); SqlParameter sqlParam7 = new SqlParameter("@Password", SqlDbType.NVarChar); sqlParam7.Value = pedObj .encryptPassword (pwd); sqlParam7.Size = 50; sqlParams.Add(sqlParam7); try { b.initializeDBConnection(); insert = b.execByKeyParams( Query.strInsertIntoRegistrationTable1, sqlParams); if (insert !=0) { msg = msgObj .msgRecInsertedSuccess ; } } catch (SqlException sqlEx) { string str = msgObj.msgErrorMessage + sqlEx.Message + sqlEx.StackTrace; } return msg; } public class AuthHeader : SoapHeader { public string Username; public string sessionId; } }

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