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• Is it really wrong to version documents using CouchDB's behaviour?

  - by Tomas Sedovic

  This is one of those "I know I shouldn't do this but it's oh so convenient." questions. Sorry about that. I plan to use CouchDB for storing a bunch of documents and keeping their entire revision history. CouchDB does the versioning automatically, but it is strongly discouraged for programmer's use: "You cannot rely on document revisions for any other purpose than concurrency control." From what I've found on the CouchDB wiki, the versions can get deleted either during compaction or during replication. As far as I can tell, Compaction must always be triggered manually and Replication occurs only when there's more than one database server. The question is: if I won't run compaction and will use only single database instance for my documents, can I just use CouchDB's document versioning and expect it to work? What other problems I might run into? E.g. does not running compaction hurt the performance or consume significantly more disk space (than if I did handle the versioning manually)?

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• Microsoft MyPhone - .NET access possible?

  - by ZombieSheep

  I've searched this as much as I can in the time available, but haven't turned anything up. Does anyone know if it is possible to access data backed up from a WinMo device to Microsoft's MyPhone service programatically, without having to restore all the data back to the device? I'm looking at a way of also keeping a local backup of contacts and SMS messages on my desktop machine, but it seems that if there is an API for doing so, Microsoft haven't advertised it at all. I'm hoping that my inability to find any reference on Google is due to my incompetence rather than it not being supported by Microsoft.

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• Java long task - Did it stop writing to file?

  - by rockit

  I am writing a lot of data to a file, and while keeping my eye on the file it eventually stopped growing in size. Essentially my task is getting information from a database, and printing out all non-unique values in column A. Since there are many rows to the database table, and the database table is across my network, this is taking days to complete. Thus I'm concerned that since the file isn't growing, that it isn't actually writing to the file anymore. Which is odd, I have no "catch"'s in my code, so if there was a problem writing to file, wouldn't it have thrown an error?! Should I let the task complete (estimate 2-3 days from today), or is there something else that I don't know going on here making my application not write to the file?! my algorithm goes something like this Declare file Create new file Open file for writing get database connection get resultset from database for each row in the resultset - write column "A" to file - if row# % 100000 then write to screen "completed " + row# + " rows" when no more rows exist close file write to screen - "completed"

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• How can I make this Dictionary TryGetValue code more readable?

  - by mafutrct

  I'd like to test if an id was not yet known or, if it is known, if the associated value has changed. I'm currently using code similar to this, but it is hard to understand for those not familiar with the pattern. Can you think of a way to make it more readable while keeping it short in LOC? string id; string actual; string stored; if (!someDictionary.TryGetValue (id, out stored) || stored != actual) { // id not known yet or associated value changed. }

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• Good overview tool / board for visualizing Subversion branch acitivity?

  - by Sam

  Our team is sometimes finding it a bit confusing and time-consuming to figure out which subversion operations have been perrformed on our different branches in Subversion. Example, when has the Development branch last been merged into the Trunk? When was this particular Tag created, based on what branch etc etc. All of this information can of course be extracted from the Subversion Log, but thats always a manual, time-consuming and error-prone process. Simplest solution seems to be a simple whiteboard with a visualization of all the different branches/tags/trunk in Subversion and people drawing on it, whenever something significant happens. But we're not averse to finding some kind of a digital solution as well, stored centrally. Obviously both systems depend on people actually maintaining the model, but you'll always more or less have that. What do you use as best practice for keeping a clear view on all Subversion operations in the current Sprint (or beyond)?

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• Is referencing a selector faster in jquery than actually calling the selector? if so, how much does it make a difference?

  - by anthonypliu

  Hi, I have this code: $(preview-button).click(...) $(preview-button).slide(...) $(preview-button).whatever(...) Is it a better practice to do this: var preview-button = $(preview-button); preview-button.click(...); preview-button.click(...); preview-button).slide(...); preview-button.whatever(...); It probably would be better practice to do this for the sake of keeping code clean and modular, BUT does it make a difference performance wise? Does one take longer to process than the other? Thanks guys.

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• Saving data that is in a table efficiently and also is easy to retrieve and echo back out

  - by Harry

  Information I currently have a table which image is below, Problem I have made this table using ul & li Here is the code http://jsfiddle.net/8j2qe/1/ Question What would be the best way of storing the data in the image and easily displaying it? Keeping in mind that each column can only have 1 entry. Thank you! And any questions will be answered ASAP! EDIT Sorry, I dont think I was clear enough in my initial question. What I am asking is, what is the best way to store and then display this type of data. I want to DISPLAY data from my database to show like it would in the image. Should I have a column in my database for each column on the table, then say either A,B,C or D depending on what column it is in but then how would I display it using PHP in my code provided? Im struggling to find a good way of explaining this, I am sorry.

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• IRepository with Inherited Classes

  - by Stacey

  In keeping with the Repository pattern of data input, I've a question in regards to using inherited classes. For instance, suppose I would have the class... class Employee IEmployeeRepository { Add(Employee employee); } This works fine, nothing wrong with it so far... but now let's say I continue on.. class Manager : Employee Okay, now let's assume that I never need to enter a manager different than an Employee? What's the best approach here? Would a scenario such as .. IEmployeeRepository { Add<T>(T employee) where T : Employee } Be the best approach, or do I need to abstract a different repository for each type?

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• Transfer of directory structure over network

  - by singh

  I am designing a remote CD/DVD burner to address hardware constraints on my machine. My design works like this: (analogous to a network printer) Unix-based machine (acts as server) hosts a burner. Windows-based machine acts as client. Client prepares data to burn and transfers it to the server. Server burns the data on CD/DVD. My question is: what is the best protocol to transfer data over the network (Keeping the same directory hierarchy) between different operating systems?

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• Qt/C++ event loop exception handling

  - by Georg

  I am having an application heavily based on QT and on a lot of third party libs. THese happen to throw some exceptions in several cases. In a native Qt App this causes the application to abort or terminate. Often the main data model is still intact as I am keeping it in pure Qt with no external data. So I am thinking that I could also just recover by telling the user that there has occured an error in this an that process and he should save now or even decide to continue working on the main model. Currently the program jsut silently exits without even telling a story. Please help.

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• Setting 0 margin in header using LaTeX's fancyhdr

  - by Morten

  Hi, I'm trying to define a custom layout for my report for which I'm using fancyhdr. On the pages which contains a chapter start I want my header to contain a colorbox spanning across the whole page (0 cm margins) although keeping my defaults margin in the text area. I can get the box to span across the "margin notes" area, but not the other side. Here's some of my code: \fancypagestyle{plain}{ % pages containing chapter start \fancyhead{} \fancyhead[RO]{\colorbox{NavyBlue}{\textcolor{White}{\raisebox{0cm}[1cm][0.5cm]{\makebox[3cm][c]{\textbf{\CNoV\thechapter}}}}} } Any ideas on how to do it?

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• An image cropper: How to prevent the default drag n' drop action?

  - by David Gore

  I am developing an image cropper and would like to ask you the following question: In order to prevent the default drag n' drop action when you press the left button on an image and keeping it pressed try to move the mouse, wouldn't it be cross-browser if to just use the picture as a background to a div box? Just like so: <div id="theDiv" style="background:url(pic.png) no-repeat;"></div> How do you think? Is it acceptable? Not too ugly? Or should be done with JS?

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• Including external C++ libraries in version control

  - by m0tive

  I'm currently starting a project which is going to be developed on a few different computer and I'm keeping in sync with bzr. In the project I'm using a couple of 3rd party libraries, like SDL. In the past I've just pushed a copy of the compiled library to my version control, but that usually seems to massively inflate the size of the branch and generally seem like a bad idea. Is that the normal practice, just pushing the required libraries, or is there a better way of added libraries to distributed version control like bzr or git? (I know on svn you can use svn:external to do something similar to this)

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• apache alias and .htacess willing to understand configuration?

  - by sushil bharwani

  On our local dev enviornment we had just one server and to add far future expires and cache control header to static images we kept a .htaccess file in the root of the application things worked fine. But on our prod we have multiple apache servers having aliases to a code base on a different server. Here in this case i am not sure where to keep .htacess file on. Should i be keeping it on code base or on the individual apache servers. How can i write the same stuff that i have written in .htaccess file to httpd.conf file.

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• How to properly align textboxes on a webpage with labels

  - by Grant

  Hi, this is a CSS / design question. I have three textboxes that i want to be center aligned on a web page. Then i want a label description to the right of each one. When i use attribute like text:align:centre because the labels are of different length it throws out the aligment of the textboxes [see image link below] http://www.mediafire.com/imageview.php?quickkey=qcyoajm2iuk Is there an easy way of keeping the textboxes aligned and then have the labels off the to the right without changing the textboxes? Thanks.

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• how to write T-SQL to compare and copy data?

  - by George2

  Hello everyone, I have two SQL Server 2008 Enterprise databases (on two machines), and one of the databases is master database and another database is slave database. I want to transfer update from a table in source database to a table in destination database (two tables are of the same schema, both of them are using a single column as unique primary key). The transfer rule is (in short, the rule is keeping the destination database the same as source database because of the update of the source database), if there is a new row in source database but not in destination database, insert the row in destination database; if a row not exists in source database but exists in destination database, delete the row in destination database; if a row's content (i.e. columns other than primary key columns) changes in source database, update the new content into destination database. thanks in advance, George

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• As a programmer what single discovery has given you the greatest boost in productivity?

  - by ChrisInCambo

  This question has been inspired by my recent discovery/adoption of distributed version control. I started using it (mercurial) just because I liked the idea of still being able to make commits at times when I couldn't connect to the central server. I never expected it would give me a large boost in general productivity, but a pleasant side effect I discovered was that making a new clone every time I started a new task and giving that clone a descriptive folder name is extremely effective at keeping me on task resulting is a noticeable productivity increase. So as a programmer what single discovery has given you the greatest boost in productivity? Extra respect for answers which involve tools or practices that aren't so obvious from the outside!

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• SVN tool to rebase a branch in git style

  - by timmow

  Are there any tools available that will let me rebase in git style an SVN branch onto a new parent? So, in the following situation, I create a feature branch, and there are commits to the trunk E---F---G Feature / A---B---C---D--H--I trunk I'm looking for a tool which copies the trunk, and applies the commits one by one, letting me resolve any conflicts if any exist - but each commit retains the same commit message, and is still a separate commit. E'---F'---G' Feature / A---B---C---D--H--I trunk So commit E' will be a commit with the same changes as E, except in the case of E causing a conflict, in which case E' will differ from E in that E' has the conflicts resolved, and the same commit message as E. I'm looking for this as it helps in keeping branches up to date with trunk - the svnmerge.py / mergeinfo way does not help, as you still need to resolve your changes when you merge back to trunk.

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• Does any Version Control System like SVN, Git, or Mercurial let you "keep latest version" but not th

  - by Jian Lin

  In our project files, if there are binary files, such as .doc, .xls, .jpg, and we choose to not keep their past revisions (just keeping a latest version is ok), is there a way to tell SVN, Git, or Mercurial or some other tool to skip the revisions for these files or for a particular folder? Say, there is a 4MB .doc file that I need to check in hundred of times, but I don't really care so much about its past versions. So if the system keeps 100 revisions of it, that's already 400MB... checking in 300 times means 1.2GB for 1 file and that's not good. Only the latest version is good so that everybody can sync to it.

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• Using .htaccess to rewrite dynamic subdomains

  - by brokekidweb

  I'm currently using .htaccess to rewrite on my website to create dynamic subdomains. I also use it to remove the .php extension on all pages. However, once inside the subdomain, it tries to redirect again. For example, if you went to https://admin.example.com/test, it would actually be accessing https://example.com/clients/admin/test.php. I keeping getting various 404 errors using the following .htaccess file: Options +MultiViews Options +FollowSymLinks RewriteEngine On RewriteRule ^subdomains/(.*)/(.*) http://$1.example.com/$2 [r=301,nc] RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^([^\.]+)$ $1.php [NC,L] RewriteCond %{HTTP_HOST} !^(www\.)?example\.com$ [NC] RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.example\.com$ [NC] RewriteCond %{DOCUMENT_ROOT}/%2%{REQUEST_URI}/ -d RewriteRule [^/]$ %{REQUEST_URI}/ [R=301,L] RewriteCond %{ENV:REDIRECT_STATUS} ^$ RewriteCond %{HTTP_HOST} !^(www\.)?example\.com$ [NC] RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.example\.com$ [NC] RewriteRule ^(.*)$ clients/%2/$1 [QSA,L] How can I keep this from redirecting to https://admin.example.com/clients/admin/test.php?

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• Can I store and join based on external attributes in Lucene/Solr

  - by Kibbee

  Is there a way to store information about documents that are stored in Lucene such that I don't have to update the entire document to update certain attributes about the documents? For instance, let's say I had a bunch of documents, and that I wanted to update a permissions list of who was allowed to see the documents on a daily, or more frequent, basis. Would it be possible to update all the permissions each day, without updating all the documents. I could do it by keeping a exactly which permissions were added and removed, but I would rather just be able to take the end list of permissions, and use that, rather than have to keep track of all the permission changes and post those entire documents to Lucene.

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• How can I have centered text and right-aligned image in the same element?

  - by Ethan

  I have some th elements with text in them that should be centered and they also contain images: The up/down arrow graphic is a separate image. My question is, what is the simplest reliable way to position that image over to the right side of the th element while keeping the text centered? I'm open to using jQuery/JavaScript if there's a reasonably simple way to do it. One caveat: I need the up/down graphic to be a separate image, not part of the header background. <th> Title <img src='/images/sort_unsorted.jpg' /> </th>

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• Directory layout for a Python project with C extension modules

  - by Kamil Kisiel

  We have numerous projects in our organization that are mixed Python/C. Currently we're trying to standardize on a directory layout for our projects and are trying to come up with a convenient scheme. One point of contention is where to put C extension modules in the tree. We're tossing around a couple of options (relative to project root): ./src/package/subpackage/module.c or alongside the python modules in the package tree: ./package/subpackage/module.c or in a src directory in the subpackage: ./package/subpackage/src/module.c One reason for keeping them out of the package directories could be because it will lead to clutter, especially if there are other .c and .h files which aren't themselves modules but still need to be compiled. Also in the "integrated" scheme, what do you do with headers and files that are used by more than one module? Put them in a common top-level directory? I'd be interested to know what other people are using, or if there are any established best practices for this.

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• Help with a query

  - by stackoverflowuser

  Hi Based on the following table ID Effort Name ------------------------- 1 1 A 2 1 A 3 8 A 4 10 B 5 4 B 6 1 B 7 10 C 8 3 C 9 30 C I want to check if the total effort against a name is less than 40 then add a row with effort = 40 - (Total Effort) for the name. The ID of the new row can be anything. If the total effort is greater than 40 then trucate the data for one of the rows to make it 40. So after applying the logic above table will be ID Effort Name ------------------------- 1 1 A 2 1 A 3 8 A 10 30 A 4 10 B 5 4 B 6 1 B 11 25 B 7 10 C 8 3 C 9 27 C I was thinking of opening a cursor, keeping a counter of the total effort, and based on the logic insert existing and new rows in another temporary table. I am not sure if this is an efficient way to deal with this. I would like to learn if there is a better way.

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• How do I create two mutual producer/consumers with internal state in Haskell?

  - by Keith

  I've got an agent that takes in states and returns actions, while keeping an internal representation of the utility of state/action pairs. I've also got an environment that takes in actions and returns state/reward pairs. I need to be able to set the agent up with a start state and then continuously go from agent -(action)- environment -(state, reward)- agent -(action)-... However, the internal states (which need to be updated every iteration) need to stay private (that is, within the agent or the environment). This means that I can't simply call environment as a function within the agent using state and action as arguments. I'm somewhat of a Haskell noobie, so I'm not even sure if this is possible.

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