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• SVN problems after migration with CVS2SVN

  - by Bjorn C

  We´ve migrated from CVS on AIX to SVN on Linux via CVS2SVN. The migration seems to have went well but when working in SVN we get a lot of Tree Conflicts that doesn´t seem to be conflicts at all? Looking at the revision graphs, one can see that the graph for e.g. trunk and a branch isn´t the same, i.e. they contain different sets of revisions of the file. Either of the 3 ways to resolve this conflict when merging in TortoiseSVN leaves the revision graphs separate, they cannot be "melted" together. Could it be that CVS2SVN didn´t understand that a file in different branches is the same even if the file system path is the same? Anyone who has experienced this? Thanks, Bjorn

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• Git: can't undo local changes (error: path ... is unmerged)

  - by mklhmnn

  I have following working tree state $ git status foo/bar.txt # On branch master # Unmerged paths: # (use "git reset HEAD <file>..." to unstage) # (use "git add/rm <file>..." as appropriate to mark resolution) # # deleted by us: foo/bar.txt # no changes added to commit (use "git add" and/or "git commit -a") File foo/bar.txt is there and I want to get it to the "unchanged state" again (similar to 'svn revert'): $ git checkout HEAD foo/bar.txt error: path 'foo/bar.txt' is unmerged $ git reset HEAD foo/bar.txt Unstaged changes after reset: M foo/bar.txt Now it is getting confusing: $ git status foo/bar.txt # On branch master # Changes to be committed: # (use "git reset HEAD <file>..." to unstage) # # new file: foo/bar.txt # # Changed but not updated: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: foo/bar.txt # The same file in both sections, new and modified? What should I do? Thanks in advance.

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• Problem with Regex in .NET (C#)

  - by Craig Bovis

  I'm trying to write a a regex to validate a string to match the following rules. Must start with a-z (case insensitive) Must only contain a-z A-Z 0-9 . - I've put something together based on my limited knowledge and ran it through an online testing tool for a whole bunch of situations and the results were as I had hoped however when I place the pattern into my .NET code it doesn't match correctly. The pattern I am using is, [a-zA-Z][a-zA-Z0-9.\-]* Is this the correct pattern or am I barking up the wrong tree? Some examples of what I'm expecting. craig.bovis - VALID 24craig - INVALID craig@bovis - INVALID craig24 - VALID -craig24 - INVALID craig24.bovis-test - VALID

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• adding errors to Django form errors.__all__

  - by hendrixski

  How do I add errors to the top of a form after I cleaned the data? I have an object that needs to make a REST call to an external app (google maps) as a pre-save condition, and this can fail, which means I need my users to correct the data in the form. So I clean the data and then try to save and add to the form errors if the save doesn't work: if request.method == "POST": #clean form data try: profile.save() return HttpResponseRedirect(reverse("some_page", args=[some.args])) except ValueError: our_form.errors.__all__ = [u"error message goes here"] return render_to_response(template_name, {"ourform": our_form,}, context_instance=RequestContext(request)) This failed to return the error text in my unit-tests (which were looking for it in {{form.non_field_errors}}), and then when I run it through the debugger, the errors had not been added to the forms error dict when they reach the render_to_response line, nor anywhere else in the our_form tree. Why didn't this work? How am I supposed to add errors to the top of a form after it's been cleaned?

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• Sub-classing TreeView in WinForms for mouse over tool tips

  - by Matt

  Ok, this is a weird one. The expected behaviour for a TreeView control is that, if ShowNodeToolTips is set to false, then, when a label for a tree node exceeds the width of the control (or, more accurately, it's right hand edge is past the right hand edge of the client area), then a tooltip is shown above the node showing the full item's text. I'd like to disable that, because the above semantic doesn't always work, depending on what the treeview is contained within. So I have rolled my own, and got the tooltips to work (and line up better than the default one!) - but I would like to be able to disable the 'default' behaviour for situations where it would work natively. So, can anyone point me in the right direction as to which message to post to the TreeView in order to disable that behaviour? I have looked at the windows control reference, but couldn't find anything that looked like it might be the one.

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• antlr3StringStreamNew string input error [ at offset 0, at <EOF> : cannot match to any predicted input... ]

  - by Embeguru

  I'm using ANTLR 3.4 with simplecTreeParser example and want to give string input from main.c I'v modified input in main as mentioned bellow pANTLR3_UINT8 input_string = (pANTLR3_UINT8)"int a;"; input = antlr3StringStreamNew(input_string, ANTLR3_ENC_8BIT, sizeof(input_string),(pANTLR3_UINT8)"ABCD"); Apparently getting following error -end of input-(1) : error 3 : 23:1: declaration : ( variable | functionHeader ';' - ^( FUNC_DECL functionHeader ) | functionHeader block - ^( FUNC_DEF functionHeader block ) );, at offset 0, at : cannot match to any predicted input... The parser returned 1 errors, tree walking aborted. Any other way to give String input Regards

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• WCF Double Hop questions about Security and Binding.

  - by Ken Maglio

  Background information: .Net Website which calls a service (aka external service) facade on an app server in the DMZ. This external service then calls the internal service which is on our internal app server. From there that internal service calls a stored procedure (Linq to SQL Classes), and passes the serialized data back though to the external service, and from there back to the website. We've done this so any communication goes through an external layer (our external app server) and allows interoperability; we access our data just like our clients consuming our services. We've gotten to the point in our development where we have completed the system and it all works, the double hop acts as it should. However now we are working on securing the entire process. We are looking at using TransportWithMessageCredentials. We want to have WS2007HttpBinding for the external for interoperability, but then netTCPBinding for the bridge through the firewall for security and speed. Questions: If we choose WS2007HttpBinding as the external services binding, and netTCPBinding for the internal service is this possible? I know WS-* supports this as does netTCP, however do they play nice when passing credential information like user/pass? If we go to Kerberos, will this impact anything? We may want to do impersonation in the future. If you can when you answer post any reference links about why you're answering the way you are, that would be very helpful to us. Thanks!

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• adding to json property that may or may not exist yet

  - by mmcgrail

  let say i want to do this var dasboard = {}; $('.check').click(function(){ $(this).toggleClass("active").siblings().slideToggle('slow', function() { dashboard['pages']['pagename'][$(this).closest('li').attr("id")]['show'] = $(this).is(":hidden") ? 'collapsed' : 'expanded'; }); } i get an error saying 'dashboard.pages is undefined' is there away to dynamically add 'pages' and the children that follow without having to do the work of checking to see if it is defined first then if its not doing dashboard['pages'] = {}; because sometimes they may already exist and I don't want to have to inspect the tree first i just want to build the branches as needed

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• How to exploit Diffie-hellman to perform a man in the middle attack

  - by jfisk

  Im doing a project where Alice and Bob send each other messages using the Diffie-Hellman key-exchange. What is throwing me for a loop is how to incorporate the certificate they are using in this so i can obtain their secret messages. From what I understand about MIM attakcs, the MIM acts as an imposter as seen on this diagram: Below are the details for my project. I understand that they both have g and p agreed upon before communicating, but how would I be able to implement this with they both having a certificate to verify their signatures? Alice prepares ?signA(NA, Bob), pkA, certA? where signA is the digital signature algorithm used by Alice, “Bob” is Bob’s name, pkA is the public-key of Alice which equals gx mod p encoded according to X.509 for a fixed g, p as specified in the Diffie-Hellman key- exchange and certA is the certificate of Alice that contains Alice’s public-key that verifies the signature; Finally, NA is a nonce (random string) that is 8 bytes long. Bob checks Alice's signature, and response with ?signB{NA,NB,Alice},pkB,certB?. Alice gets the message she checks her nonce NA and calculates the joint key based on pkA, pkB according to the Diffie-Hellman key exchange. Then Alice submits the message ?signA{NA,NB,Bob},EK(MA),certA? to Bob and Bobrespondswith?SignB{NA,NB,Alice},EK(MB),certB?. where MA and MB are their corresponding secret messages.

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• Managing Cisco programatically; Telnet vs SNMP?

  - by MikeHerrera

  I was recently approached by a network-engineer, co-worker who would like to offload his minor network admin duties to a junior-level helpdesk tech. The specific location in need of management acts as an ISP for tenants on its single-site property, so there's a lot of small adjustments being made on a daily basis. I am thinking it would be helpful to write him a winform app to manage the 32 Cisco devices, on-site. I'd like to initially provide functionality which could modify access control lists, port VLAN assignments, and bandwidth limitations per VLAN... adding more to the list as its deemed valuable. My initial thought was to emulate a telnet session with the network device; utilizing my network-engineer's familiarity with the command-line / IOS interaction. Minimal time would be required to learn Cisco IOS conventions, myself. Though while searching for solutions, it appears that most people favor SNMP. That, or, their specific circumstances pushed them in the direction of SNMP. I wanted to know if I've overlooked an obvious benefit of SNMP. Should I be using SNMP? Why or why not?

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• Counting number of children in hierarchical SQL data

  - by moontear

  Hello, for a simple data structure such as so: ID parentID Text Price 1 Root 2 1 Flowers 3 1 Electro 4 2 Rose 10 5 2 Violet 5 6 4 Red Rose 12 7 3 Television 100 8 3 Radio 70 9 8 Webradio 90 For reference, the hierarchy tree looks like this: ID Text Price 1 Root |2 Flowers |-4 Rose 10 | |-6 Red Rose 12 |-5 Violet 5 |3 Electro |-7 Television 100 |-8 Radio 70 |-9 Webradio 90 I'd like to count the number of children per level. So I would get a new column "NoOfChildren" like so: ID parentID Text Price NoOfChildren 1 Root 8 2 1 Flowers 3 3 1 Electro 3 4 2 Rose 10 1 5 2 Violet 5 0 6 4 Red Rose 12 0 7 3 Television 100 0 8 3 Radio 70 1 9 8 Webradio 90 0 I read a few things about hierarchical data, but I somehow get stuck on the multiple inner joins on the parentIDs. Maybe someone could help me out here. moon

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• Implementation of a general-purpose object structure (property bag)

  - by Thomas Wanner

  We need to implement some general-purpose object structure, much like an object in dynamic languages, that would give us a possibility of creating the whole object graph on-the-fly. This class has to be serializable and somehow user friendly. So far we have made some experiments with class derived from Dictionary<string, object> using the dot notation path to store properties and collections in the object tree. We have also find an article that implements something similar, but it doesn't seem to fit completely into our picture either. Do you know about some good implementations / libraries that deal with a similar problem or do you have any (non-trivial) ideas that could help us with our own implementation ? Also, I probably have to say that we are using .NET 3.5, so we can't take advantage of the new features in .NET 4.0 like dynamic type etc. (as far as I know it's also not possible to use any subset of it in .NET 3.5 solution).

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• SCNetworkReachability compiling error

  - by user262325

  Hello everyone I try to compile Ercia Sadun's sample codes at: http://github.com/erica/iphone-3.0-cookbook-/tree/master/C13-Networking/14-Web%20Browser/ There is error report : warning: in /Users/interdev/iphone source code/Web Browser/Classes/SystemConfiguration.framework/SystemConfiguration, missing required architecture i386 in file Undefined symbols: "_SCNetworkReachabilityScheduleWithRunLoop", referenced from: +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o "_SCNetworkReachabilityCreateWithAddress", referenced from: +[UIDevice(Reachability) hostAvailable:] in UIDevice-Reachability.o +[UIDevice(Reachability) pingReachabilityInternal] in UIDevice-Reachability.o "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from: +[UIDevice(Reachability) unscheduleReachabilityWatcher] in UIDevice-Reachability.o "_SCNetworkReachabilitySetCallback", referenced from: +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o +[UIDevice(Reachability) unscheduleReachabilityWatcher] in UIDevice-Reachability.o "_SCNetworkReachabilityGetFlags", referenced from: +[UIDevice(Reachability) hostAvailable:] in UIDevice-Reachability.o +[UIDevice(Reachability) pingReachabilityInternal] in UIDevice-Reachability.o ld: symbol(s) not found collect2: ld returned 1 exit status "_SCNetworkReachabilityScheduleWithRunLoop", referenced from: +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o "_SCNetworkReachabilityCreateWithAddress", referenced from: +[UIDevice(Reachability) hostAvailable:] in UIDevice-Reachability.o +[UIDevice(Reachability) pingReachabilityInternal] in UIDevice-Reachability.o "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from: +[UIDevice(Reachability) unscheduleReachabilityWatcher] in UIDevice-Reachability.o "_SCNetworkReachabilitySetCallback", referenced from: +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o +[UIDevice(Reachability) scheduleReachabilityWatcher:] in UIDevice-Reachability.o +[UIDevice(Reachability) unscheduleReachabilityWatcher] in UIDevice-Reachability.o "_SCNetworkReachabilityGetFlags", referenced from: +[UIDevice(Reachability) hostAvailable:] in UIDevice-Reachability.o +[UIDevice(Reachability) pingReachabilityInternal] in UIDevice-Reachability.o ld: symbol(s) not found collect2: ld returned 1 exit status Build failed (5 errors) even I add systemConfiguration.framework, it reported same error. Welcome any comment Thanks interdev

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• How can I use a TreeWalker to dump out the DOM

  - by michael

  Hi, In w3c dom interface, there is DOMTreeWalker to traverse the DOM. I find this example which uses DOMTreeWalker: http://www.java-tips.org/java-se-tips/org.w3c.dom/how-to-traverse-the-dom-tree-using-treewalker-2.html But my question is How can I use the DOMTreeWalk to dump the dom structure and value to a file? i.e. I need to know when a parent start and a parent end so that I can do when I dump the dom to a file (i need to insert after each parent dumps its children: <parent> <child a1="1" a2="2"/> <child a3="1" a4="3"/> <child a5="1" a6="5"/> </parent>

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• Are some data structures more suitable for functional programming than others?

  - by Rob Lachlan

  In Real World Haskell, there is a section titled "Life without arrays or hash tables" where the authors suggest that list and trees are preferred in functional programming, whereas an array or a hash table might be used instead in an imperative program. This makes sense, since it's much easier to reuse part of an (immutable) list or tree when creating a new one than to do so with an array. So my questions are: Are there really significantly different usage patterns for data structures between functional and imperative programming? If so, is this a problem? What if you really do need a hash table for some application? Do you simply swallow the extra expense incurred for modifications?

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• Good-practices: How to reuse .csproj and .sln files to create your MSBuild script for CI ?

  - by Gishu

  What is the painless/maintainable way of using MSBuild as your build runner ? (Forgive the length of this post) I was just trying my hand at TeamCity (which I must say is awesome w.r.t. learning curve and out of the box functionality). I got an SVN MSBuild NUnit NCover combo working. I was curious as to how moderate to large projects are using MSBuild - I've just pointed MSBuild to my Main sln file. I've spent some time with NAnt some years ago and I found MSBuild to be a bit obtuse. The docs are too dense/detailed for a beginner. MSBuild seems to have some special magic to handle .sln files ; I tried my hand at writing a custom build script by hand, linking/including .csproj files in order (such that I could have custom pre-post build tasks). However it threw up (citing duplicate target imports). I'm assuming most devs wouldn't want to go messing around with msbuild proj files - they'd be making changes to the .csproj and .sln files. Is there some tool / MSBuild task that reverse-engineers a new script from an existing .sln + its .csproj files that I'm unaware of ? If I'm using MSBuild just to do the compile step, I might as well use Nant with an exec task to MSBuild for compiling the solution ? I've this nagging feeling that I'm missing something obvious. My end-goal here is to have a MSBuild build script which builds the solution that acts as a build script instead of a compile step. Allows custom pre/post tasks. (e.g. call nunit to run a nunit project (which seems to be not yet supported via the teamcity web UI)) stays out of the way of the developers making changes to the solution. No redundancy ; shouldn't require devs to make the same change in 2 places

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• mysql, sqlite database source code

  - by Yang

  hi guys, i know implementing database is a huge topic, but i want to have a basic understanding of how database systems works (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database, since there are a few already proven very robust open source databases like mysql, sqlite and so on. however, the code are very complicated and i have no clue where to start. also i find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how should i get started and is there any books that emphasis on the technology and techniques of building dbms used in modern database industry? Thank in advance!

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• asp.net mvc - bootstrapping object via model binder

  - by csetzkorn

  Hi, I have a domain object Thing which can contain several Categories. So I have implemented my HTML helper to create a checkbox group of all possible Categories. I have no problem receiving: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Create(Thing Thing, List<string> Categories) However I am wondering whether I could use a custom Model binder to use just this: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Create(Thing Thing) So basically I am looking for a way to use the model binder to bootstrap the object tree/graph. Any pointers appreciated. Thanks. Christian

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• treeview binding wpf cannot bind nested property in a class

  - by devnet247

  Hi all New to wpf and therefore struggling a bit. I am putting together a quick demo before we go for the full implementation I have a treeview on the left with Continent Country City structure when a user select the city it should populate some textboxes in a tabcontrol on the right hand side I made it sort of work but cannot make it work with composite objects. In a nutshell can you spot what is wrong with my zaml or code. Why is not binding to a my CityDetails.ClubsCount or CityDetails.PubsCount? What I am building is based on http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx Thanks a lot for any suggestions or reply DataModel public class City { public City(string cityName) { CityName = cityName; } public string CityName { get; set; } public string Population { get; set; } public string Area { get; set; } public CityDetails CityDetailsInfo { get; set; } } public class CityDetails { public CityDetails(int pubsCount,int clubsCount) { PubsCount = pubsCount; ClubsCount = clubsCount; } public int ClubsCount { get; set; } public int PubsCount { get; set; } } ViewModel public class CityViewModel : TreeViewItemViewModel { private City _city; private RelayCommand _testCommand; public CityViewModel(City city, CountryViewModel countryViewModel):base(countryViewModel,false) { _city = city; } public string CityName { get { return _city.CityName; } } public string Area { get { return _city.Area; } } public string Population { get { return _city.Population; } } public City City { get { return _city; } set { _city = value; } } public CityDetails CityDetailsInfo { get { return _city.CityDetailsInfo; } set { _city.CityDetailsInfo = value; } } } XAML <DockPanel> <DockPanel LastChildFill="True"> <Label DockPanel.Dock="top" Content="Title " HorizontalAlignment="Center"></Label> <StatusBar DockPanel.Dock="Bottom"> <StatusBarItem Content="Status Bar" ></StatusBarItem> </StatusBar> <Grid DockPanel.Dock="Top"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="2*"/> </Grid.ColumnDefinitions> <TreeView Name="tree" ItemsSource="{Binding Continents}"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}"/> <Setter Property="IsSelected" Value="{Binding IsSelected,Mode=TwoWay}"/> <Setter Property="FontWeight" Value="Normal"/> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold"></Setter> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type ViewModels:ContinentViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Continent.png"/> <TextBlock Text="{Binding ContinentName}"/> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type ViewModels:CountryViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Country.png"/> <TextBlock Text="{Binding CountryName}"/> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type ViewModels:CityViewModel}" > <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\City.png"/> <TextBlock Text="{Binding CityName}"/> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> <GridSplitter Grid.Row="0" Grid.Column="1" Background="LightGray" Width="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/> <Grid Grid.Column="2" Margin="5" > <TabControl> <TabItem Header="Details" DataContext="{Binding Path=SelectedItem.City, ElementName=tree, Mode=OneWay}"> <StackPanel > <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityName}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Area}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Population}"/> <!-- DONT WORK WHY--> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding SelectedItem.CityDetailsInfo.ClubsCount}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding SelectedItem.CityDetailsInfo.PubsCount}"/> </StackPanel> </TabItem> </TabControl> </Grid> </Grid> </DockPanel> </DockPanel>

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• What's the right way to calculate derived data in a Flex AdvancedDataGrid using summaries?

  - by Chris R

  Here's the gist of the problem: I have a set of rows of data with (say) field1 to field4 in them. I'm using a GroupingCollection to group on field1 and field2. So, I have something like this: f1.1 f2.1 f3.1 f4.1 f3.2 f4.2 f2.2 f3.3 f4.3 f3.4 f4.4 f3.5 f4.5 f1.2 f2.1 f3.6 f4.6 f2.2 f3.7 f4.7 f3.8 f4.8 f3.9 f4.9 (or at least, I hope that's clear enough) I need to calculate some derived values for each leaf row, for example f3, that is the ratio of f3 to the average of all f3 in that particular part of the tree. So, for f3.7 I need to calculate f3.7 / avg(f3.7..f3.9) and fill that into the f3_index property on the row, displaying that in lieu of f3 itself. So, basically, what it looks like I have to do is add source field values in the summarizeFunction implementation. It seems to me that there must be a better way of doing this. Is there?

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• Subversion versus Vault

  - by WebDude

  I'm currently reviewing the benefits of moving from SVN to a SourceGear Vault. Has anyone got advice or a link to a detailed comparison between the two? Bear in mind I would have to move my current Source Control system across which works strongly in SVN's favor Here is some info I have found out thus far from my own investigations. I have been taking some time tests between the two and vault seems to perform most operations much faster. Time tests used the same server as the repository, the same workstation client, and the same project. Time Comparisons SVN Add/Commit    12:30 Get Latest Revision    5:35 Tagging/Labelling    0:01 Branching    N/A - I don't think true branching exists in SVN Vault Add/Commit    4:45 Get Latest Revision    0:51 Tagging/Labelling    0:30 Branching    3:23 (can't get this to format correctly) I also found an online source comparing some other points. This is the kind of information i'm looking for. Usage Comparisons Subversion is edit/merge/commit only. Vault allows you to do either edit/merge/commit or checkout/edit/checkin. Vault looks and acts just like VSS, which makes the learning curve effectively zero for VSS users. Vault has a VS plugin, but it only works if you're going to run in checkout-mode. Subversion has clients for pretty much every OS you can imagine; Vault has a GUI client for Windows and a command line client for Mono. Both will support remote work, since both use HTTP as their transport (Subversion uses extended DAV, Vault uses SOAP). Subversion installation, especially w/ Apache, is more complex. Subversion has a lot of third party support. Vault has just a few things. My question Has anyone got advice or a link to a detailed comparison between the two?

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• Keyboard hook return different symbols from card reader depends whther my app in focus or not

  - by user363868

  I code WinForm application where one of the input is magnetic stripe card reader (CR). I am using code George Mamaladze's article Processing Global Mouse and Keyboard Hooks in C# on codeproject.com to listen keyboard (USB card reader acts same way as keyboard) and I have weird situation. One card reader CR1 (Unitech MS240-2UG) produces keystroke which I intercept on KeyPress event analyze that I intercept certain patter like %ABCD-6EFJHI? and trigger some logic. Analysis required because user can type something else into application or in another application meanwhile my app is open When I use another card reader CR2 (IdTech IDBM-334133) keystroke intercepted by hook started from number 5 instead of % (It is actually same key on keyboard). Since it is starting sentinel it is very important for me to have ability recognize input from card reader. Moreover if my app running in background and I have focus on Notepad when I swipe card string %ABCD-6EFJHI? appears in Notepad and same way, with proper starting character) intercepted by keyboard hook. If swiped when focus on Form it is 5ABCD-6EFJHI? User who tried app with another card reader has same result as me with CR2. Only CR1 works for me as expected I was looking into Device manager of Windows and both devices use same HID driver supplied by MS. I checked devices though respective software from CR makers and starting and ending sentinels set to % and ? respective on both. I would appreciate and ideas and thoughts as I hit the wall myself Thank you

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• Make Apache to show different index.html also in browser's address bar

  - by Marco Demaio

  I have the following foloder tree on my shared hosting server: www.somesite.com | |_ public_html (document folder) |_ .htaccess (Apache file) |_ inde.html (page shown by server now when someone looks for www.somesite.com) | |_ site_editor (folder) | |_login.html (site editor control panel) | |_file1.php | |_file2.php | |_ ... | |_ website (folder) |_ index.html (website HOME PAGE) |_ page1.html |_ page2.html |_ etc. Now when someone looks for www.somesite.com the webserver look for index.html in public_html folder. I would like the web server to show website/index.html when someone looks for www.somesite.com and I would like his browser bar to show only www.somesite.com/index.html and not www.somesite.com/website/index.html I would also like the web server to show site_editor/login.html when someone looks for www.somesite.com/site_editor/ Is it possible to accomplish both task by setting .htaccess files in some ways??? Thanks!

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• MySQL index cardinality - performance vs storage efficiency

  - by Sean

  Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns. From my admittedly poor understanding of B-tree structure, I believe that a lower cardinality means the storage efficiency of the index is better, because there are less parent nodes. Whereas a higher cardinality means less efficient storage, but faster read performance, because it has to navigate through less branches to get to whatever data it is looking for to narrow down the rows for the query. (Note - by "low" vs "high", I don't mean e.g. 1 million vs 99 million for a 100 million row table. I mean more like 90 million vs 95 million) Is my understanding correct? Related question - How does cardinality affect write performance?

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• Hierarchical data in Linq - options and performance

  - by Anthony

  I have some hierarchical data - each entry has an id and a (nullable) parent entry id. I want to retrieve all entries in the tree under a given entry. This is in a SQL Server 2005 database. I am querying it with LINQ to SQL in C# 3.5. LINQ to SQL does not support Common Table Expressions directly. My choices are to assemble the data in code with several LINQ queries, or to make a view on the database that surfaces a CTE. Which option (or another option) do you think will perform better when data volumes get large? Is SQL Server 2008's HierarchyId type supported in Linq to SQL?

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