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• Should I use a huge composite primary key or just a unique id?

  - by Jack

  I have been trying to do web scraping of a particular site and storing the results in a database. My original assumptions about the data allowed a schema where I could use fairly reasonable composite primary keys (usually containing only 2 or 3 fields) but as time went on, I realized that my original assumptions about the data were wrong and my primary keys were not as unique as I thought they were, so I have slowly been expanding them to contain more and more fields. In fact, I have recently come to believe that their database has no constraints whatsoever. Just today, I have finally expanded my a primary key for one of my tables to contain every field in that table and I thought now would be a good time to ask: is it better to add an auto-incrementing column that is just a unique id or just leave a composite primary key on the entire table?

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• When and why does an EventHandler require objects to be final?

  - by Michiel Borkent

  I have the following code from a GWT Project that is part of the onModuleLoad() method (similar to Java's main method, if you don't know GWT): final TextBox t1 = new TextBox(); final Label lt1 = new Label(); t1.addKeyUpHandler(new KeyUpHandler() { @Override public void onKeyUp(KeyUpEvent event) { // TODO Auto-generated method stub if (!(t1.getText().matches("\\w{2}-\\w{2}-\\w{2}"))) lt1.setText("Invalid."); else lt1.setText("OK."); } }); Why do the two local variables have to be final here?

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• Buttons size not equal in IE and Firefox

  - by Anurag

  I have few buttons on my jsp page and I am using the style as : .buttonblue { background-color: #003366; border-color: #99CCFF; color: #FFFFFF; font-family: Verdana,Arial,Helvetica; font-size: 8pt; font-weight: bold; height: 20px; display:inline; line-height: 1.2; text-align: center; margin-top: 2px; } In Firefox the buttons are bit smaller than IE6. I can not define the size of buttons as the caption changes the button size changes accordingly. I tried with width:auto but no success. Also, with overflow:visible the buttons in IE becomes bit smaller. Please help.

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• Unique identification string in php

  - by NardCake

  Currently me and my friend are developing a website, for what we will call 'projects' we just have a basic auto increment id in the database used to navigate to projects such as oururl.com/viewproject?id=1 but we started thinking, if we have alot of posted projects thats going to be a LONG url. So we need to somehow randomly generate a alphanumerical string about 6 characters long. We want the chance of the string being duplicated being extremely low and of course we will query the database before assigning an identifier. Thanks for anyhelp, means alot!

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• Is there a script that can dynamically list the contents of a folder?

  - by user294756

  I am redesigning my company's intranet site in Wordpress and one of the things they need is an archive of company memos. There are over 300 memos saved in one location and I'm wondering if there is a jQuery script that I can run that will read the contents of a local (network) folder and auto-generate a list of the contents of that folder dynamically (and generate those names as a hyperlink to that file, but if I can list the files, I can get include the hyperlink tag myself). I can always manually create the list of hyperlinks (would take a couple days to do so) but if I can generate it dynamically, whenever a new memo is added, the script will automatically include it making the site much easier to maintain. Is this at all possible? I know that this can probably be done in PHP, but the page I need to do this on is not a php page, it is one of the subpages that is created in wordpress that does not have a php file extension and can't run php code (that I know of) Thanks in advance for any and all assistance.

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• Makefile rule depending on change of number of files instead of change in content of files.

  - by goathens

  I'm using a makefile to automate some document generation. I have several documents in a directory, and one of my makefile rules will generate an index page of those files. The list of files itself is loaded on the fly using list := $(shell ls documents/*.txt) so I don't have to bother manually editing the makefile every time I add a document. Naturally, I want the index-generation rule to trigger when number/title of files in the documents directory changes, but I don't know how to set up the prerequisites to work in this way. I could use .PHONY or something similar to force the index-generation to run all the time, but I'd rather not waste the cycles. I tried piping ls to a file list.txt and using that as a prerequisite for my index-generation rule, but that would require either editing list.txt manually (trying to avoid it), or auto-generating it in the makefile (this changes the creation time, so I can't use list.txt in the prerequisite because it would trigger the rule every time).

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• SQL Database application written in Visual Basic in Visual Studio 2010

  - by TID

  Hello, I am writing a program and part of it is to store the keyed entry in a database on an sql server when the enter key is hit. The database is small and simple with only three entry spots in the table. one for the tracking number, one for the date entered, and one for the time entered. The only thing the user will see is the tracking number text box and an enter button. the date and time will be auto entered when the enter key is hit. i am relatively new to databases so i cannot figure out how to send the data to the database. The database is already configured, just need to get the program and the database talking to eachother. Thanks.

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• Best practice for autoupdates

  - by ravi

  For desktop based applications, what are best practices to perform auto updates? Currently, we download all files, then copy and register (if com dll) to their respective directories. I looked at Google Chrome update method. It seems that it first downloads a zipped file into a directory, and then unzips all the files. Also, they have a setup application which seems to be used to do the update. Additionally, they create a directory mapped to update version like 1.0.154.43, but they keep the old version's directory.

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• FTP .NET Sockets

  - by Jojo

  Hi Everyone, I have an FTP auto downloader program. It downloads new files from a given FTP folder. The application was successful for some FTP folders that i have tested. These folders contain 30 - 50 files. However, when i tried an FTP folder with 150 and 18000 files, i receive this error message: An established connection was aborted by the software in your host machine. My first assumptions will be because of firewalls or anti virus. I don't have administrative access to this computer so I would like to ask if there are other reasons for this before i raise this to our systems dept? Need anyone's help asap. Thanks :)

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• How to make a div expand vertically to wrpa the content within it?

  - by MalcomTucker

  I have a div which wraps a number of images that are generated dynamically. I don't know how high the list of images is. My problem is the div that contains the dynamically generated images doesn't behave like it is housing any content - I want it to extend to the height of the list of images. Each image is itself wrapped in a div. This is the wrapper div: .block { padding:10px; margin-top:10px; height:auto; background-color:#f9f9f9; } This is the markup dynamically generated for (one of) the images: <div class="block"> <div style="float: left; padding: 2px 2px 2px 2px;"><IMG SRC="45.jpg" BORDER="0"/></div> ..... How do I get the block div to extend down with the images? Thanks

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• does class/object models have a out-of-the-box equivalent to a database foreign key constraint

  - by Greg

  Hi, Does does class/object models have a out-of-the-box equivalent to a database foreign key constraint? Assume the language is C# please. That is say Class A has a field that references Class B and vica-versa. If I have Object A & B (instantiated from these classes) what happens if I delete Object B? Does it auto-delete or throw a constraint issue if it still exists in Object A as a reference? That is, for this scenario is there a way to ensure when a Object A is delete that either (a) object B is delete like a cascade delete, or (b) a constraint exception is thrown as the expectation is that the reference in Class B should be non-null?

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• Why is std::tr1::shared_ptr<>.reset() so expensive?

  - by Paul Oyster

  Profiling some code that heavily uses shared_ptrs, I discovered that reset() was surprisingly expensive. For example: struct Test { int i; Test() { this->i = 0; } Test(int i) { this->i = i; } } ; ... auto t = make_shared<Test>(1); ... t.reset(somePointerToATestObject); Tracing the reset() in the last line (under VC++ 2010), I discovered that it creates a new reference-counting object. Is there a cheaper way, that reuses the existing ref-count and does not bother the heap?

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• Sending an anonymous email to my own address

  - by N3HL

  I want to send an anonymous email to my own gmail/hotmail/yahoo/any other mail service address (Im not trying to spam or something like that). Why? I have a .NET application and I want to add a "Send log to the developer" feature (attaching the log) using SmtpClient. The fact is I've read like 30+ pages, and found out, i.e. gmail's smtp client doesn't allow anonymous connections, and many other things. The idea is to receive a mail message like this: From: [email protected] (non-existent email really) To: [email protected] (this would be my real address which will recieve the logs attachments) Subject: Issue report nºX (auto-generated) Body: From a textbox Attachments: logs attached Is this possible? If so, how do I achieve it?

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• Drupal: what's the easiest way to let my customer to upload video thumbnails and associate them to v

  - by Patrick

  hi, my customer wants a gallery of videos and images (small thumbnails) and if you click on one of them you can see the picture / video in the overlaying lightbox). Now, I cannot install auto-generating video thumbnails because I don't have access to ffmpeg module on the server. I can only allow my customer to upload these thumbnails by himself. I'm using image and video CCK fields for each node to allow my customer images and videos. However I dunno how should I let him upload thumbnails for his videos. Should I create an additional Image CCK field for this ? Consequently, I should somehow associate the videos with the images in the design and my customer should pay attention to place them in the same order.. this is not very nice solution, but it is the only one that came to my mind so far. Furthermore, I'm using the lightbox I should somehow ignore the video thumbnails and display the videos instead... some tips ? Thanks

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• Tag <code>: how to "correct" publish it ?

  - by stighy

  Hi, i'm not sure to explain what i'm looking for. What's the name of the "source code parser" for publish code, in HTML ? For example, when i write some source code here in stack overflow, system auto-detect the sintax and write "correct" source code in html. I've noticed that exists the HTML <"code" tag, but it simply write source code in "courier" font. So i'm asking you if exists some "external" component that, given a text, parse it out correctly in a HTML page. Thank you!

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• How do I simplify this templated vector initializer loop using lambdas or STL transform?

  - by Neil G

  How do I simplify this templated vector initializer loop using lambdas or some kind of STL transform? template<typename T> template<typename... Args> void InitToRandomValues(vector<T>* retval, int n, RNG& rng, Args const&... args) { retval->resize(n); for (auto it = retval->begin(); it != retval->end(); ++it) { typename T::CPDDist cpd(rng, args...); *it = T(cpd); } }

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• Deprecated Preference Activity method

  - by Adnan Nazir

  package com.adi.preferencedemotest; i am working on PreferenceActivity but when i call my preference xml(prefs.xml) with the help of addPreferencesFromResource it says this method is deprecated and "This function is not relevant for a modern fragment-based PreferenceActivity" is there any alternative of this method? how i can handle ? public class PrefsActivity extends PreferenceActivity { @SuppressWarnings("deprecation") <------- @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.prefs); <------- } } Note: may be my question rate as duplicated but i didn't find any.

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• Limit calls to external database with Python CGI

  - by Matt Ball

  I've got a Python CGI script that pulls data from a GPS service; I'd like this information to be updated on the webpage about once every 10s (the max allowed by the GPS service's TOS). But there could be, say, 100 users viewing the webpage at once, all calling the script. I think the users' scripts need to grab data from a buffer page that itself only upates once every ten seconds. How can I make this buffer page auto-update if there's no one directly viewing the content (and not accessing the CGI)? Are there better ways to accomplish this?

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• CSS+HTML: tds are overlapping

  - by Budda

  On my web-site http://vfm-elita.com (it is not in English, sorry for that) - center and right columns are overlapping, please see screenshot for details: Between left and center columns you can see a "gap" with a green background - it is expected and good. But there are no any gap between center and right columns, instead they are overlapping. Issue exists in all known browsers There are no special formatting applied to columns. They are usual 'TD' columns, the only CSS modifier is width that is "250px" for left and right columns, and for center - it is "auto". Please advise how can I correct that error. Thanks a lot!

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• How to access device settings on a S60 symbian based mobile phone?

  - by TheRHCP

  Hello everyone, I recently bought a Sony Ericsson mobile phone which embeds Symbian S60 and I would like to add a missing feature myself. In fact I cannot actually disable Internet connection in an easy way when roaming, which cost me a lot of money last time I moved away ... So I would like to develop a little application that would just replace the actual Internet configuration with a fake configuration to avoid auto-connections. So what I would like to know is how can I access programmatically to my phone settings? I believe that this is possible but I do not really have a clue where to start. I know that Sony Ericsson provides a SDK to run Java applications on its customised JVM but Symbian is also providing a SDK to develop applications for S60 devices in many languages. The real questions is which SDK will provide an API able to access phone settings. This is not well documented so I am asking this question with the hope that someone here already had experience with development for Sony Ericsson/Symbian devices. Thanks.

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• Question about implement air widget manager

  - by L.J.W

  Hi all, I have a question about invoking air in air,please give me some advice. I want to use air technology in enterprise business,and I think widget manager(engine) like google desktop,vista sidebar is a good system entrypoint.so I look for a widget manager basing AIR,the widget manager can load air widget, and auto upgrade widget silently ,and have a cool user-interface like google desktop or vista sidebar or yahoo's. Any product existed and recommend?and if I need to implement myself,any idea or advice?How can I embed the widget interface into the manager(engine) interface seamless,how can I invoke the specified window(maybe not the init window) in the widget air application from the manager? Thanks and best regards

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• How to convert string to integer?

  - by user1260584

  So I'm having a hard time with my situation and need some advice. I'm trying to convert my two Strings that I have into integers, so that I can use them in math equations. Here is what I tried, however it brings me an error in the app. ' equals.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub num1 = edit.getText().toString(); num2 = edit.getText().toString(); int first = Integer.parseInt(num1); int second = Integer.parseInt(num2); edit.setText(first + second); } }); Is there something that I am doing wrong? Thank you for any help. EDIT: Yes this is Java. num1 and num2 are strings that I have previously named. What do you mean by trim?

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• How do develop a Java web application without having to deploy all the time

  - by ChrisSmith..zzZZ

  I've set up a simple Eclipse 3.5/Jetty 6.1 web app which returns hello world. It works. This is on Windows and uses the "Jetty Generic Server Adapter". I have auto deployment working so that it deploys after changes periodically. How do I go about setting it up so that if I change any static content it doesn't have to redeploy i.e I can just hit F5 to see the changes straight away. For minor HTML changes it's quite unusable waiting 20-30 seconds for a deployment.

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• SQL SELECT INSERTed data from Table

  - by Noam Smadja

  its in ASP Classic. MS-Access DB. i do: INSERT INTO Orders (userId) VALUES (123)" what i want to retrieve is orderNumber from that row. its an auto-increment number. so i did: SELECT orderNumber FROM Orders WHERE userId=123 but since it is on the same page, the SELECT returns: Either BOF or EOF is True, or the current record has been deleted. Requested operation requires a current record. i've seen somewhere RETURNING orderNumber as variable but it was for oracle and i dont know how to implement it into my asp :( set addOrder = Server.CreateObject("ADODB.Command") addOrder.ActiveConnection = MM_KerenDB_STRING addOrder.CommandText = "INSERT INTO Orders (userId) VALUES ("&userId&")" addOrder.CommandType = 1 addOrder.CommandTimeout = 0 addOrder.Prepared = true addOrder.Execute() Dim getOrderNumber Set getOrderNumber = Server.CreateObject("ADODB.Recordset") getOrderNumber.ActiveConnection = MM_KerenDB_STRING getOrderNumber.Source = "SELECT orderNumber FROM Orders WHERE userId=" & userId getOrderNumber.CursorType = 0 getOrderNumber.CursorLocation = 2 getOrderNumber.LockType = 1 getOrderNumber.Open() session("orderNumber") = getOrderNumber.Fields.Item("orderNumber").value

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• Are Triggers Based On Queries Atomic?

  - by David

  I have a table that has a Sequence number. This sequence number will change and referencing the auto number will not work. I fear that the values of the trigger will collide. If two transactions read at the same time. I have ran simulated tests on 3 connections @ ~1 million records each and no collisions. CREATE TABLE `aut` ( `au_id` int(10) NOT NULL AUTO_INCREMENT, `au_control` int(10) DEFAULT NULL, `au_name` varchar(50) DEFAULT NULL, `did` int(10) DEFAULT NULL, PRIMARY KEY (`au_id`), KEY `Did` (`did`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 TRIGGER `binc_control` BEFORE INSERT ON `aut` FOR EACH ROW BEGIN SET NEW.AU_CONTROL = (SELECT COUNT(*)+1 FROM aut WHERE did = NEW.did); END;

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