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• How to 'insert if not exists' in MySQL?

  - by warren

  I started by googling, and found this article which talks about mutex tables. I have a table with ~14 million records. If I want to add more data in the same format, is there a way to ensure the record I want to insert does not already exist without using a pair of queries (ie, one query to check and one to insert is the result set is empty)? Does a unique constraint on a field guarantee the insert will fail if it's already there? It seems that with merely a constraint, when I issue the insert via php, the script croaks.

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• Upload and preview image in client side without posting back

  - by Ahmy

  I need to upload an image and then preview it without posting back as i need to have a file upload control(even HTMLinputfile or ASPfileupload) then the user will browse to select image after selecting (browsing) there will a button(HTMLInputButton) that will save the uploaded image and preview it. I have the following code : <div> <input id="UploadInput" type="file" value="Upload" /> <br /> <input id="PreviewBtnInput" type="button" value="Preview" onclick="ShowPreview()" /> <br /> <img id="ImgUploaded" /> </div> So how can i do this task ? Thanks in advance for any reply but please if any one has a link for article that talk about this issue please i need a clear code not article details.

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• C# string equality operator returns false, but I'm pretty sure it should be true... What?!

  - by Daniel Schaffer

  I'm trying to write a unit test for a piece of code that generates a large amount of text. I've run into an issue where the "expected" and "actual" strings appear to be equal, but Assert.AreEqual throws, and both the equality operator and Equals() return false. The result of GetHashCode() is different for both values as well. However, putting both strings into text files and comparing with DiffMerge tells me they're the same. Additionally, using Encoding.ASCII.GetBytes() on both values and then using SequenceEquals to compare the resulting byte arrays returns true. The values are 34KB each, so I'll hold off putting them here for now. Any ideas? I'm completely stumped.

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• Code won't exit foreach block

  - by Matt

  I've got the following C# code segment that takes a list, finds objects that are ready to update, then shoves them into a temp list, deletes from the main list, and then goes on its merry way. My issue is that the foreach block, which cycles through my main list, won't exit. TempLog.Clear(); //Ensure TempLog is empty foreach (CLogger ready in PlayerLog) { if (ready.UpdateReady == true) // Record is ready to be updated in database { TempLog.Add(ready); // Add record to templog PlayerLog.Remove(ready); // Remove from playerlog } } <---- Never reaches this point if (TempLog.Count > 0) // Just check that templog isn't empty { new Thread(Update).Start(); // Run update code } I've put heaps of debugging in, and I can watch PlayerLog start at 1, TempLog at 0, then it enters the foreach loop, picks up that the record UpdateReady flag is on, TempLog goes to 1, PlayerLog goes to 0, then it just stops.. No errors, just stops.. Thanks for the help :)

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• jQuery code works in Firebug, but not on its own

  - by Ben

  I'm having quite the brainbuster of an issue right now. I am trying to change a link's hash tag at the end from "respond" to "comments" with jQuery. I have a simple script that should do this, however it does not work. The link does not change. However, Firebug shows no errors and when I run the code in Firebug's console, it works just as I intend. Why doesn't this work on its own? Does anybody have a solution, I'm at my wits edge with this one. (function ($) { $(document).ready(function() { $("a[href$='respond']").each(function() { $(this).attr("href", $(this).attr('href').replace("respond", "comments")); }); }); })(jQuery.noConflict()); Thanks so much, I know this might be a pain to test but I'm really thankful.

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• How can I share code across static libraries without duplicate symbol errors?

  - by Ben Flynn

  I am new to building static libraries and would like to create 2(+) libraries each of which has some unique code and some shared code. My intention is that other projects will link one or more of these static libraries. Util.h/m <-- Shared ImplOne.h/m <-- Unique to 'ImplOne' ImplTwo.h/m <-- Unique to 'ImplTwo' I am using XCode and generating the libraries by building Util.m and ImplOne.m in one case, and Util.m and ImplTwo.m in the other. Of course the issue is that I now cannot use these libraries together because they will have duplicate symbols. What is a better architecture for this situation?

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• Magento 1.4 Load By Category Not Working

  - by LinuxGnut

  Hi folks. I have a Magento helper class I wrote that works wonderfully in 1.3. However, we're working on a new install of 1.4 and filtering by category won't work for some reason. function __construct() { Mage::app(); $this-model = Mage::getModel('catalog/product'); $this-collection = $this-model-getCollection(); $this-collection-addAttributeToFilter('status', 1);//enabled $this-collection-addAttributeToSelect('*'); } function filterByCategoryID($catID) { $this-collection-addCategoryFilter(Mage::getModel('catalog/category')-load($catID)); } I can't figure out why this isn't working in 1.4. Has anyone else come into this issue?

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• magento login page loads with a white background

  - by megamage

  I use magento 1.8.1 and I just moved my localhost site to a new server and imported my database using phpmyadmin and deleted the contents inside var/cache & var/session folders but when I try to access my backend the login page is loading in left top corner with a white background. However I can access to my backend and my localhost login page is still loading fine but the magento login page in my new server is not loading fine. I don't know what went wrong. Please help me out to solve this issue.Thanks in advance

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• string substitution regular expression not working in tcl

  - by Puneet Mittal

  i am trying to replace all the special characters including white space, hyphen, etc, to underscore, from a string variable in tcl. I wrote the code below but it doesn't seem to be working. set varname $origVar puts "Variable Name :>> $varname" if {$varname != ""} { regsub -all {[\s-\]\[$^?+*()|\\%&#]} $varname "_" $newVar } puts "New Variable :>> $newVar" one issue is that, instead of replacing the string in $varname, it is replacing the data inside $origVar. No idea why, and also i read the example code (for proper syntax) in my tcl book and according to that it should be something like this regsub -all {[\s-][$^?+*()|\\%&#]} $varname "_" newVar so i used the same syntax but it didn't work and gave the same result as modifying the $origVar instead of required $varname value.

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• Not loading the object caused EF4 (code first) to remove the relationship

  - by Lavinski

  Firstly this is a EF4: Code First - Property Loading question. I'm loading an object like so var item = Context.Table.Find( update.Identifier ); This object has a property Relationship so a table has a Relationship object. Now i'm updating my item but my Relationship object is not toched (and therefore not lazy loaded). Now here's the problem .. I save my item and my relationship to the Relationship object is deleted, apparently the model thinks i set it to null. However it all works if I look at the property before saving. So I'm looking into LoadProperty or doing a query and using Include. Has anyone else come across this issue and how did you get around it?

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• Passenger problem: "no such file to load" -- /config/environment

  - by Mason Jones

  I've been researching this one and found references to similar problems here and there, but none of them has led to a solution yet. I've installed passenger (2.2.11) and nginx (0.7.64) and when I start things up and hit a Rails URL, I get an error page informing me of a load error: no such file to load -- /path/to/app/config/environment From what I've found online this appears to be some sort of a user/permissions error, but I've tried all the logical fixes: I've made sure that /config/environment.rb is not owned by root, but by a webapp user. I've tried setting passenger_default_user, I've tried setting passenger_user_switching off. I've even tried setting the nginx user, though that shouldn't matter much. I've gotten some differing results, but nothing's actually worked. I'm hoping someone may have the magical combination of settings and permissions for this. I may try backing down to an earlier version of Passenger, because I've never had this issue before; it's been a little while since I set up Passenger though. Thanks for any suggestions.

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• How can I close a SimpleModal dialog when the user clicks the Back button?

  - by Wally Hartshorn

  When a user clicks on a button or link, I use the SimpleModal jQuery plugin to display a dialog to overlay the entire page, preventing the user from clicking another button or link during the delay before the next page loads. (I'd like to avoid this, but that's an issue for another day.) After the next page displays, if the user clicks the Back button, the previous page still has the SimpleModal overlay displayed, preventing them from using the page. This is a problem. How can I cause the SimpleModal dialog to close automatically either when the leaves the page or when the user clicks the Back button to return to the page? I tried this without success: $("body").unload(function() { $.modal.close(); }); Thanks! Wally

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• JQuery JEditable stay in edit mode on error

  - by Justin

  I'm successfully using jeditable to submit via a function using jQuery.ajax and the async : false option , but am having an issue aborting if an error is returned. How can I get the edit box to stay activated and / or revert back to the original value if there are errors? I'm returning http status codes. so something like async : false .ajax submit here... if (xhr.status == 200) { return value; else { alert ('returned error'); // keep edit box activated but available for another try, or revert back to original value } I tried not returning a value from the function, which keeps the edit box activated and ready for another submit, but then the ESC key doesn't work anymore and if I click outside the edit area, the edit box stays. Thanks in advance!

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• HELP! How can I display one style in Safari and a different style in Chrome?

  - by aWarner

  My client is starting to get antsy....so any help would be greatly appreciated. I am having issues with my secondary page header images shifting. It is displaying correctly in Firefox, I haven't been able to check in IE yet w/out access to a PC. It was displaying correctly in Chrome, but shifting in Safari. I added the "webkit hack" to write a specific css style for Safari, but once I did that....it started shifting in Chrome. What can I do to fix this issue?? http://airwavetelecom.net/beta/?page_id=2

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• 'is instanceof' Interface bad design

  - by peterRit

  Say I have a class A class A { Z source; } Now, the context tells me that 'Z' can be an instance of different classes (say, B and C) which doesn't share any common class in their inheritance tree. I guess the naive approach is to make 'Z' an Interface class, and make classes B and C implement it. But something still doesn't convince me because every time an instance of class A is used, I need to know the type of 'source'. So all finishes in multiple 'ifs' making 'is instanceof' which doesn't sound quite nice. Maybe in the future some other class implements Z, and having hardcoded 'ifs' of this type definitely could break something. The escence of the problem is that I cannot resolve the issue by adding functions to Z, because the work done in each instance type of Z is different. I hope someone can give me and advice, maybe about some useful design pattern. Thanks

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• 0.20.2 API hadoop version with java 5

  - by abdeslam

  I have started a maven project trying to implement the MapReduce algorithm in java 1.5.0_14. I have chosen the 0.20.2 API hadoop version. In the pom.xml i'm using thus the following dependency: < dependency < groupId>org.apache.hadoop< /groupId> < artifactId>hadoop-core< /artifactId> < version>0.20.2< /version> < /dependency But when I'm using an import to the org.apache.hadoop classes, I get the following error: bad class file: ${HOME_DIR}\repository\org\apache\hadoop\hadoop-core\0.20.2\hadoop-core-0.20.2.jar(org/apache/hadoop/fs/Path.class) class file has wrong version 50.0, should be 49.0. Does someone know how can I solve this issue. Thanks.

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• Select calls seems to not time out.

  - by martsbradley

  HI Folks, I have a threaded C++ program where up to three threads are calling select on a three separate socket descriptors waiting for data to become available. Each thread handles one socket and adds it to the readfds with a timeout of 300 seconds. After select returns if there is data available I'm calling recv to read it. Is there anything that I need to be aware of with winsock and threads because for some reason after a number of hours the select calls all seem to be not timing out. Can a multi threaded program select from a number of threads without issue? I know that I should have one thread listening to all three sockets however that would be a large change for this app and I'm only looking to apply a bug fix. cheers, Martin.

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• Query executes with no error but not in trigger

  - by liaqat ali

  I am facing a strange problem in creating trigger in MS SQL. I have a query that executes with out an error but when I place it within trigger body, it gives error Invalid column name 'ScreenName'. I am placing whole trigger code here. Please trace the issue. CREATE TRIGGER [dbo].[tr_tbFieldLabels_FieldLabelLength] ON [dbo].[tbFieldLabels] AFTER INSERT AS Update tbFieldLabels Set TextBoxLength = (SELECT top 1 TextboxLength FROM tbFieldLabelsSource FLS WHERE FLS.ScreenName = Inserted.ScreenName AND tbFieldLabelsSource.SystemName = Inserted.SystemName) FROM tbFieldLabels , Inserted WHERE tbFieldLabels.ID = Inserted.ID GO Please help me ASAP.

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• Inconsistent values in network switch throughput values

  - by Marcus Hughes

  Quite simple, I have a network switch with SNMP, and need to calculate the throughput of the switch port, so simply I use ifOutOctets. We transfer a file which is 145MB and if we use the total from the start, subtracted from the value at the end then the value is : 158901842 I simply can't get the value to match, or be anything similar to what the real transfer is. I understand that there may be excess traffic etc but I just can't get it to be anywhere similar (the server being tested has no traffic when this is not running) We have tried for a long time and suspect there may be an issue with the recording on the HP switch, do you have any suggestions, or how should we be calculating it? Thanks a lot in advance We have a HP ProCurve 1810G on 2.2

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• Read Text File line by line using Command Prompt/Batch

  - by user353305

  Hello All, First of all I am very thankful to the owner of this website. I have learned and implement various technologies with the help of solutions provided by the readers. I know the question I asked is posted many time in this forum. And I have tired all of the solutions available, but no luck I may case I am trying to read a dat file which is basically a msg/feed file having more than 22000 Characters. Every line may or may not be of same length. My requirement is to convert the file to fixed line length character file. I have a logic that work well using vb script, however its pretty slow. I have checked with For f/ but no luck. The only delimiter I have is EOT, which i can see in Textpad but not in notepad. I have tried with \n, token=. Please help me in resolving the issue. Regards, Rajiv [email protected]

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• Django startup importing causes reverse to happen

  - by nicknack

  This might be an isolated problem, but figured I'd ask in case someone has thoughts on a graceful approach to address it. Here's the setup: -------- views.py -------- from django.http import HttpResponse import shortcuts def mood_dispatcher(request): mood = magic_function_to_guess_my_mood(request) return HttpResponse('Please go to %s' % shortcuts.MOODS.get(mood, somedefault)) ------------ shortcuts.py ------------ MOODS = # expensive load that causes a reverse to happen The issue is that shortcuts.py causes an exception to be thrown when a reverse is attempted before django is done building the urls. However, views.py doesn't yet need to import shortcuts.py (used only when mood_dispatcher is actually called). Obvious initial solutions are: 1) Import shortcuts inline (just not very nice stylistically) 2) Make shortcuts.py build MOODS lazily (just more work) What I ideally would like is to be able to say, at the top of views.py, "import shortcuts except when loading urls"

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• Programming cookbook? [closed]

  - by user73669

  Possible Duplicate: What is the single most influential book every programmer should read? Hello With sites like The Daily WTF and recurring threads on Slashdot and elsewhere about bad programming, I figured that, to avoid people reinventing the wheel (badly or not), there should be a good, fat book on programming that would go through typical programming problems and show good, known algorithms, either in pseudo-code or some language with an easy syntax so that the language is not an issue. Here's the list of books on the subject I saw at my local computer bookstore. Can you recommend a couple, or add to this list if it's missing better options? The art of computer programming Code complete Masterminds of programming 97 things every programmer should know The passionate programmer Pragmatic thinking & learning Coders at work The algorithm design manual Algorithms and programming How to think about algorithms How to think like a programmer Why programs fail Beautiful data Beautiful code The productive programmer Solid code Write great code Clean code Programming language pragmatics Hello world Learning Processing Learn to program Thank you.

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• Force Close problem while Moving track ball on disabled EditText On HTC Hero Phone?

  - by UMMA

  dear friends, i have a small form with four EditText fields in which second EditText is disable for text Editing. now when i roll Android Phone ball to move from the top to bottom first time it selects disabled EditText and then third EditText and moves downward to foruth EditText. but when i try to move upward on Disabled EditText it displays me error Force Close after selecting it. it is only happening in phone not in Emulator. please guide how to resolve this issue? any help would be appriciated.

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• Initialising structs in C++

  - by Neil Butterworth

  As an addendum to this question, what is going on here: #include <string> using namespace std; struct A { string s; }; int main() { A a = {0}; } Obviously, you can't set a std::string to zero. Can someone provide an explanation (backed with references to the C++ Standard, please) about what is actually supposed to happen here? And then explain for example): int main() { A a = {42}; } Are either of these well-defined? Once again an embarrassing question for me - I always give my structs constructors, so the issue has never arisen before.

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• Resharper: how to force introducing new private fields at the bottom of the class?

  - by Igor Brejc

  Resharper offers a very useful introduce and initialize field xxx action when you specify a new parameter in a constructor like: Constructor (int parameter) The only (minor) nuisance is that it puts the new field at the beginning of the class - and I'm a fan of putting private parts as far away as possible from the prying eyes of strangers ;). If, however, you already have some private fields in the class, Resharper will put the new field "correctly" (note the quotes, I don't want to start a flame war over this issue) next to those, even if they are at the end of the class. Is there a way to force Resharper to always put new fields at the end of the class? UPDATE: OK, I forgot to mention I know about the "Type Members Layout in Options" feature, but some concrete help on how to modify the template to achieve fields placement would be nice.

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