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  • code review: Is it subjective or objective(quantifiable) ?

    - by Ram
    I am putting together some guidelines for code reviews. We do not have one formal process yet, and trying to formalize it. And our team is geographically distributed We are using TFS for source control (used it for tasks/bug tracking/project management as well, but migrated that to JIRA) with VS2008 for development. What are the things you look for when doing a code review ? These are the things I came up with Enforce FXCop rules (we are a Microsoft shop) Check for performance (any tools ?) and security (thinking about using OWASP- code crawler) and thread safety Adhere to naming conventions The code should cover edge cases and boundaries conditions Should handle exceptions correctly (do not swallow exceptions) Check if the functionality is duplicated elsewhere method body should be small(20-30 lines) , and methods should do one thing and one thing only (no side effects/ avoid temporal coupling -) Do not pass/return nulls in methods Avoid dead code Document public and protected methods/properties/variables What other things do you generally look for ? I am trying to see if we can quantify the review process (it would produce identical output when reviewed by different persons) Example: Saying "the method body should be no longer than 20-30 lines of code" as opposed to saying "the method body should be small" Or is code review very subjective ( and would differ from one reviewer to another ) ? The objective is to have a marking system (say -1 point for each FXCop rule violation,-2 points for not following naming conventions,2 point for refactoring etc) so that developers would be more careful when they check in their code.This way, we can identify developers who are consistently writing good/bad code.The goal is to have the reviewer spend about 30 minutes max, to do a review (I know this is subjective, considering the fact that the changeset/revision might include multiple files/huge changes to the existing architecture etc , but you get the general idea, the reviewer should not spend days reviewing someone's code) What other objective/quantifiable system do you follow to identify good/bad code written by developers? Book reference: Clean Code: A handbook of agile software craftmanship by Robert Martin

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  • Slimbox 2 Plugin, jQuery Flickr, and IE8

    - by Nick H.
    Hello, I am currently developing a site that I make use of two jQuery plugins: Flickr jquery plugin (http://code.google.com/p/jquery-flickr/) Slimbox (http://code.google.com/p/slimbox/) The first plugin is used to pull in flickr photos from a specific account. These photos are displayed as thumbnails on the page. I am then using the second plugin to display larger views of these images. Because the flickr photos are fetched when the page loads, I am calling the Slimbox 2 function like this: $(document).ready(function() { $("#Flickr").flickr(); //Call Flickr plugin $(window).bind('load', function() { $("#Flickr a").slimbox();//Call Slimbox2 }); }); On first testing this seemed to have worked perfectly. I tested multiple versions of FireFox, IE7, IE6, and Safari. Everything is great. However, the Slimbox lightbox effest does not work in IE8. However, if I put IE8 into compatibility mode, everything works as expected. I would like to avoid forcing compatibility mode. There are no javascript errors and I am at a loss for testing. Here is a link to a sample: http://www.njhall.com/JRMcCourt-Builders/index.html#ourwork Any advice would be greatly appreciated. Thanks Nick

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  • Ajax actionlinks straight from a DropDownList

    - by Ingó Vals
    I've got a small linkbox on the side of my page that is rendered as a PartialView. In it I have a dropDownlist the should change the routing value of the links in the box but I'm having difficulty doing so. My current plan is to call on something similar to a Ajax.ActionLink to reload the partial view into the with a different parameter based on the value of the dropdown selection. However I'm having multiple problems with this, for example as a novice in using dropdownlists I have no idea how to call on the selected value for example. <%= Html.DropDownList("DropDownList1", new SelectList(Model, "ID", "Name"), "--Pick--", new { AutoPostBack = "true", onchange = "maybe something here" })%> I tried putting in the sys.mvc.AsyncHyperlink into the onchange attribute and that worked except I don't know how to put in the route value for it. Sys.Mvc.AsyncHyperlink.handleClick(this, new Sys.UI.DomEvent(event), { insertionMode: Sys.Mvc.InsertionMode.replace, updateTargetId: 'SmallMenu' } Is there no straight Ajax drop down list that fires events onchange? Any way this is possible? I have later in the Partial view the Ajax actionlinks but they need to have their id's updated by the value in the dropdownlist and if I could do that somehow else I would appreciate a suggestion.

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  • Newbie, deciding Python or Erlang

    - by Joe
    Hi Guys, I'm a Administrator (unix, Linux and some windows apps such as Exchange) by experience and have never worked on any programming language besides C# and scripting on Bash and lately on powershell. I'm starting out as a service provider and using multiple network/server monitoring tools based on open source (nagios, opennms etc) in order to monitor them. At this moment, being inspired by a design that I came up with, to do more than what is available with the open source at this time, I would like to start programming and test some of these ideas. The requirement is that a server software that captures a stream of data and store them in a database(CouchDB or MongoDB preferably) and the client side (agent installed on a server) would be sending this stream of data on a schedule of every 10 minutes or so. For these two core ideas, I have been reading about Python and Erlang besides ruby. I do plan to use either Amazon or Rackspace where the server platform would run. This gives me the scalability needed when we have more customers with many servers. For that reason alone, I thought Erlang was a better fit(I could be totally wrong, new to this game) and I understand that Erlang has limited support in some ways compared to Ruby or Python. But also I'm totally new to the programming realm of things and any advise would be appreciated grately. Jo

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  • mysql - query group/concat question??

    - by tom smith
    I have a situation where I return results with mutiple rows. I'm looking for aw way to return a single row, with the multiple items in separate cols within the row. My initial query: SELECT a.name, a.city, a.address, a.abbrv, b.urltype, b.url FROM jos__universityTBL as a LEFT JOIN jos__university_urlTBL as b on b.universityID = a.ID WHERE a.stateVAL = 'CA' ...my output: | University Of Southern Califor | Los Angeles | | usc | 2 | http://web-app.usc.edu/ws/soc/api/ | | University Of Southern Califor | Los Angeles | | usc | 4 | http://web-app.usc.edu/ws/soc/api/ | | University Of Southern Califor | Los Angeles | | usc | 1 | www.usc.edu | | San Jose State University | San Jose | | sjsu | 2 | http://info.sjsu.edu/home/schedules.html | | San Jose State University | San Jose | | sjsu | 4 | https://cmshr.sjsu.edu/psp/HSJPRDF/EMPLOYEE/HSJPRD/c/COMMUNITY_ACCESS.CLASS_SEARCH.GBL?FolderPath=PORTAL_ROOT_OBJECT.PA_HC_CLASS_SEARCH | | San Jose State University | San Jose | | sjsu | 1 | www.sjsu.edu My tbl schema... mysql> describe jos_universityTBL; +----------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+----------------+ | name | varchar(50) | NO | UNI | | | | repos_dir_name | varchar(50) | NO | | | | | city | varchar(20) | YES | | | | | stateVAL | varchar(5) | NO | | | | | address | varchar(50) | NO | | | | | abbrv | varchar(20) | NO | | | | | childtbl | varchar(200) | NO | | | | | userID | int(10) | NO | | 0 | | | ID | int(10) | NO | PRI | NULL | auto_increment | +----------------+--------------+------+-----+---------+----------------+ 9 rows in set (0.00 sec) mysql> describe jos_university_urlTBL; +--------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------+--------------+------+-----+---------+----------------+ | universityID | int(10) | NO | | 0 | | | urltype | int(5) | NO | | 0 | | | url | varchar(200) | NO | MUL | | | | actionID | int(5) | YES | | 0 | | | status | int(5) | YES | | 0 | | | ID | int(10) | NO | PRI | NULL | auto_increment | +--------------+--------------+------+-----+---------+----------------+ 6 rows in set (0.00 sec) I'm really trying to get something like: |<<the concated urltype-url >>| ucs | losangeles | usc.edu | 1-u1 | 2-u2 | 3-u2 | Any pointers would be helpful!

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  • issues make a persistent object in Objective C

    - by oden
    Attempting to make a NSObject called 'Person' that will hold the login details for my application (nothing to fancy). The app is made of a navigation controller with multiple table views but I am having issues sharing the Person object around. Attempted to create a static object like this: + (Person *)sharedInstance { static Person *sharedInstance; @synchronized(self) { if(!sharedInstance) sharedInstance = [[Person alloc] init]; return sharedInstance; } return nil; } And here is the header // Person.h #import <Foundation/Foundation.h> @interface Person : NSObject { NSString *fullName; NSString *firstName; NSString *lastName; NSString *mobileNumber; NSString *userPassword; } @property(nonatomic, retain) NSString *fullName; @property(nonatomic, retain) NSString *firstName; @property(nonatomic, retain) NSString *lastName; @property(nonatomic, retain) NSString *mobileNumber; @property(nonatomic, retain) NSString *userPassword; + (Person *)sharedInstance; -(BOOL) setName:(NSString*) fname; -(BOOL) setMob:(NSString*) mnum; -(BOOL) setPass:(NSString*) pwd; @end This object setters and getters are needed in different parts of the application. I have been attempting to access them like this Person * ThePerson = [[Person alloc] init]; ThePerson = nil; NSString * PersonsName; PersonsName = [[Person sharedInstance] firstName]; Everything works well at the login screen but it dies at the next use. usually EXC_BAD_ACCESS (eek!). Clearly I am doing something very wrong here. Is there an easier way to share objects between different a number view controllers (both coded and xib)?

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  • Need advice or pointers on Release Management Strategies

    - by Murray
    I look after an internal web based (Java, JSP, Mediasurface, etc.) system that is in constant use (24/5). Users raise tickets for enhancements, bug fixes and other business changes. These issues are signed off individually and assigned to one of three or four developers. Once the issue is complete it is built and the code only committed to SVN. The changed files (templates, html, classes, jsp) are then copied to a dev server and committed to a different repository from where they are checked out to the UAT server for testing. (this often requires the Tomcat service to be restarted and occasionally the Mediasurface service as well). The users then test and either reject or approve the release. If approved the edited files are checked out to the Live server and the same process as with UAT undertaken. If rejected the developer makes the relevant changes and starts the release process again. This is all done manually without much control. Where different developers are working on similar files, changes sometimes get overwritten by builds done on out of sync code in other cases changes in UAT are moved to live in error as they are mixed up in files associated with a signed off release. I would like to move this to a more controlled and automated process where all source code and output files are held in SVN and releases to Dev, UAT and Live managed by a CI system (We have TeamCity in house for our .NET applications). My question is on how to manage the releases of multiple changes where some will be signed off and moved on and others rejected and returned to the developer. The changes may be on overlapping files and simply merging each release in to a Release Branch means that the rejected changes would have to be backed out of the branch. Is there a way to manage this using SVN and CI or will I simply have to live with the current system.

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  • Iterating arrays in a batch file

    - by dboarman-FissureStudios
    I am writing a batch file (I asked a question on SU) to iterate over terminal servers searching for a specific user. So, I got the basic start of what I'm trying to do. Enter a user name Iterate terminal servers Display servers where user is found (they can be found on multiple servers now and again depending on how the connection is lost) Display a menu of options Iterating terminal servers I have: for /f "tokens=1" %%Q in ('query termserver') do (set __TermServers.%%Q) Now, I am getting the error... Environment variable __TermServers.SERVER1 not defined ...for each of the terminal servers. This is really the only thing in my batch file at this point. Any idea on why this error is occurring? Obviously, the variable is not defined, but I understood the SET command to do just that. I'm also thinking that in order to continue working on the iteration (each terminal server), I will need to do something like: :Search for /f "tokens=1" %%Q in ('query termserver') do (call Process) goto Break :Process for /f "tokens=1" %%U in ('query user %%username%% /server:%%Q') do (set __UserConnection = %%C) goto Search However, there are 2 things that bug me about this: Is the %%Q value still alive when calling Process? When I goto Search, will the for-loop be starting over? I'm doing this with the tools I have at my disposal, so as much as I'd like to hear about PowerShell and other ways to do this, it would be futile. I have notepad and that's it. Note: I would continue this line of questions on SuperUser, except that it seems to be getting more into programming specifics.

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  • Application/Server dependency mapping

    - by David Stratton
    I'm just curious as to whether such as tool exists (free, open source, or commercial but for a reasonable price) before I build it myself. We're looking for a simple solution to simplify taking web apps online and offline when a server is undergoing maintenance. The idea is that we be able to mark a server as unavailable, and then mark all dependent (direct and indirect) as offline. Our first proof-of-concept is running, and we created an aspx page that lists various applications that have an App_Offline.html file with a friendly "Down for Maintenance" message in a GridView. In the GridView, each app has a LinkButton that, when clicked, either renames the App_Offline.htm to App_Offline.html or vice-versa to take the app online and offline. The next step is to set up all of our dependencies. For example, our store locater would be dependent on our web services, which in turn are dependent on our SQL Server. (that's a simple example. We can easily have several layers, or one app dependent on multiple servers, etc.) In this example, if the SQL server goes down, we would need to drill down recursively to find all apps that depend on it, and then turn them off and on by renaming the App_Offline file appropriately. I realize this will be relatively simple to build, but could be complex to manage. I'm sure we're not the first team to think of this concept, and I'm wondering if there are any open source tools, or if any of you have done something similar and can help us avoid pitfalls. Edit - Update I found the category of software I'm looking for. it's called CMDB - (Configuration Management Database), and it's generally more of a Network Admin type tool than a developer tool. I found some open source products in this category, but none written in .NET. I had considered moving this question to ServerFault.com when I realized I was looking for a netowrk Admin type tool, but since I'm looking for code and a modifiable solution I'll keep the question here.

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  • Large Django application layout

    - by Rob Golding
    I am in a team developing a web-based university portal, which will be based on Django. We are still in the exploratory stages, and I am trying to find the best way to lay the project/development environment out. My initial idea is to develop the system as a Django "app", which contains sub-applications to separate out the different parts of the system. The reason I intended to make these "sub" applications is that they would not have any use outside the parent application whatsoever, so there would be little point in distributing them separately. We envisage that the portal will be installed in multiple locations (at different universities, for example) so the main app can be dropped into a number of Django projects to install it. We therefore have a different repository for each location's project, which is really just a settings.py file defining the installed portal applications, and a urls.py routing the urls to it. I have started to write some initial code, though, and I've come up against a problem. Some of the code that handles user authentication and profiles seems to be without a home. It doesn't conceptually belong in the portal application as it doesn't relate to the portal's functionality. It also, however, can't go in the project repository - as I would then be duplicating the code over each location's repository. If I then discovered a bug in this code, for example, I would have to manually replicate the fix over all of the location's project files. My idea for a fix is to make all the project repos a fork of a "master" location project, so that I can pull any changes from that master. I think this is messy though, and it means that I have one more repository to look after. I'm looking for a better way to achieve this project. Can anyone recommend a solution or a similar example I can take a look at? The problem seems to be that I am developing a Django project rather than just a Django application.

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  • MVVM Madness: Commands

    - by JP
    I like MVVM. I don't love it, but like it. Most of it makes sense. But, I keep reading articles that encourage you to write a lot of code so that you can write XAML and don't have to write any code in the code-behind. Let me give you an example. Recently I wanted to hookup a command in my ViewModel to a ListView MouseDoubleClickEvent. I wasn't quite sure how to do this. Fortunately, Google has answers for everything. I found the following articles: http://blog.functionalfun.net/2008/09/hooking-up-commands-to-events-in-wpf.html http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html http://sachabarber.net/?p=514 http://geekswithblogs.net/HouseOfBilz/archive/2009/08/27/adventures-in-mvvm-ndash-binding-commands-to-any-event.aspx http://marlongrech.wordpress.com/2008/12/13/attachedcommandbehavior-v2-aka-acb/ While the solutions were helpful in my understanding of commands, there were problems. Some of the aforementioned solutions rendered the WPF designer unusable because of a common hack of appending "Internal" after a dependency property; the WPF designer can't find it, but the CLR can. Some of the solutions didn't allow multiple commands to the same control. Some of the solutions didn't allow parameters. After experimenting for a few hours I just decided to do this: private void ListView_MouseDoubleClick(object sender, MouseButtonEventArgs e) { ListView lv = sender as ListView; MyViewModel vm = this.DataContext as MyViewModel; vm.DoSomethingCommand.Execute(lv.SelectedItem); } So, MVVM purists, please tell me what's wrong with this? I can still Unit test my command. This seems very practical, but seems to violate the guideline of "ZOMG... you have code in your code-behind!!!!" Please share your thoughts. Thanks in advance.

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  • How can I set PivotField.Calculation in Excel/VSTO?

    - by Kang Su
    I'm trying to set the Calculation property on an OLAP PivotField with VSTO 3.0. For example: pivotField.Calculation = XlPivotFieldCalculation.PercentOf; If I do the above, the value I assign does not stay (Excel appears to revert the change). I suspect the reason is that the BaseField property of the PivotField also needs to be populated (as PercentOf needs a BaseField). But it appears to me that you can't set the BaseField property until you've set the Calculation property (otherwise you get a COMException). I've tried to set ManualUpdate on the PivotTable to true, but with VSTO this rarely works, as this gets reverted immediately back to false. Note, that this seems to work fine in VBA as you can assign multiple values in a single statement, like this: With ActiveSheet.PivotTables("PivotTable1").PivotFields("[Measures].[Reseller Sales Amount]") .Calculation = xlPercentOf .BaseField = "[Geography].[Geography].[Country]" .BaseItem = "[Geography].[Geography].[Country].&[France]" .NumberFormat = "0.00%" End With But with C#/VSTO there's no construct like this (that I know of) and I'm stuck not able to do something like the above. Further note, Calculation values that don't require a BaseField, e.g., XlPivotFieldCalculation.xlPercentOfTotal, get set just fine. Any help on this would be greatly appreciated!

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  • IIRF redirect combine rules?

    - by Phill
    I have 3 "rules". One to make sure URLs are lowercase another to include a slash at the end of directories, and a 3rd to force access to index.html pages to be thru the directory instead. The problem w/ how I have it is, sometimes this is causing multiple 301 redirects. I'd really like each rule to apply in turn and then if neccessary redirect once to the final url. For example a url might need to be converted to lowercase and have a slash added. Or may need to be lowecase and change from index.html to a directory. Any ideas how I can do this? Thanks very much. The rules are below: #LOWERCASE URLS For Directories, aspx, html files RedirectRule ^/(.*[A-Z].*(/|\.html|\.aspx))$ /#L$1#E [R=301] #ADD SLASH TO DIRECTORIES #--------------------------------------------- #Perm Redirect If: #Starts w/ Forward Slash #Match Any Characters Except (. or ?) 1 or more times #End w/ someting besides a dot, ?, or slash #If So, Perm Redirect captured piece W/ Slash At End and at front RedirectRule ^/([^.?]+[^.?/])$ /$1/ [I,R=301] #CHANGE INDEX.HTML REQUESTS TO DIRECTORY REQUESTS #--------------------------------------------- RedirectRule ^/(.*)/index\.html$ /$1/ [I,R=301]

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  • Problems requesting the LDAP: The server is unwilling to process the request.

    - by Flo
    We have written an authentication provider for a SharePoint web application which can requests multiple LDAP directories. One of the LDAP server have to be requested via SSL. So we imported the CA certificate which was used to sign the LDAP server's certificate into the certificate store of the SharePoint server. The following code snippet shows how we authenticate an user. The passed credentials (account, password) belong to the user we want to authenticate. var entry = new DirectoryEntry("LDAP://<ldap-server-address>", "cn=account,ou=sub,o=xyz,c=de", "password", AuthenticationTypes.SecureSocketsLayer); var searcher = new DirectorySearcher(entry); var found = searcher.FindOne(); When the code is processed, the call to searcher.FindOne() throws following exception. System.Runtime.InteropServices.COMException (0x80072035): The server is unwilling to process the request What circumstance can lead to this error? UPDATE: I found some information about the error message. There the problem seems to be the certificate store, as the user has only stored the certificate in the in the user's store and not in the computer's store. Unfortunately we've already stored it there. So could this be still a certificate issue? UPDATE/SOLUTION: Actually the problem is solved. It seems as if the root CA certificate was imported correctly but the error messages the LDAP server responded was caused by an expired user account our customer gave us for testing.

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  • Visual Studio 2010 Can no longer build .NET v3.5

    - by Adam Driscoll
    I have a 2010 project that is targeting .NET v3.5. Inexplicably I can no longer build v3.5 projects. The project doesn't have ANY references added. It won't even let me add a reference to System.Core as it is added by the 'build system'. warning CS1685: The predefined type 'System.Func' is defined in multiple assemblies in the global alias; using definition from 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll' IFilter.cs(82,49): error CS0433: The type 'System.Func' exists in both 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\System.Core.dll' and 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll' Looks like something is grabbing onto 4.0 but I'm not quite sure how to fix it. Any one else run into this? Coworker had this same issue. It took a reinstall of Windows to correct the problem I've opened a bug on this one: https://connect.microsoft.com/VisualStudio/feedback/details/558245/warning-cs1685-when-compiling-a-v3-5-net-application-in-visual-studio-2010 If the compiler is set to verbose I see this: FrameworkPathOverride = C:\Windows\Microsoft.NET\Framework\v4.0.30319 which is defined as: Specifies the location of mscorlib.dll and microsoft.visualbasic.dll. This parameter is equivalent to the /sdkpath switch of the vbc.exe compiler. Some other interesting tidbits: I've created a new project all together and cannot build v3.5 at all. I can build 2.0, 3.0, 3.5 Client Profile, 4.0 and 4.0 Client Profile with no problem. VB.NET can build v3.5 but C# cannot. I've tried a reinstall of .NET 3.5, 4.0 and Visual Studio 2010 with no success. Visual Studio debug logs shown nothing interesting and Safe Mode does not work. Trying to avoid a Windows reinstall...

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  • jQuery + InnovaStudio WYSIWYG Editor

    - by Phil Sturgeon
    I am trying to avoid hard-coding each instance of this WYSIWYG editor so I am using jQuery to create an each() loop based on function name. Annoyingly InnovaStudio seems to explode when I try. Documentation Attempt #1 <script type="text/javascript"> /* id = $(this).attr('id'); if(id.length == 0) { id = 'wysiwyg-' + wysiwyg_count; $(this).attr('id', id); } WYSIWYG[wysiwyg_count] = new InnovaEditor('WYSIWYG[' + wysiwyg_count + ']'); WYSIWYG[wysiwyg_count].REPLACE(id); */ var demo = new InnovaEditor('demo'); demo.REPLACE('wysiwyg-1'); console.log('loop'); </script> Effect Works fine, but of course only works for a single instance of the editor. If I want multiple instances I need to use an each. Attempt #2: <script type="text/javascript"> var wysiwyg_count = 1; //var WYSIWYG = []; var demo; (function($) { $(function() { $('.wysiwyg-simple').each(function(){ /* id = $(this).attr('id'); if(id.length == 0) { id = 'wysiwyg-' + wysiwyg_count; $(this).attr('id', id); } WYSIWYG[wysiwyg_count] = new InnovaEditor('WYSIWYG[' + wysiwyg_count + ']'); WYSIWYG[wysiwyg_count].REPLACE(id); */ demo = new InnovaEditor('demo'); demo.REPLACE('wysiwyg-1'); console.log('loop'); }); }); })(jQuery); </script> Effect Replaces the entire HTML body of my page with JUST WYSIWYG related code and complains as no JS is available (not even Firebug, so can't debug). Does anybody know what the hell is going on here?

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  • Time flies like an arrow demo in WinForms

    - by Benjol
    Looking at the Reactive Extensions for javascript demo on Jeff Van Gogh's blog, I thought I'd give it a try in C#/Winforms, but it doesn't seem to work so well. I just threw this into the constructor of a form (with the Rx framework installed and referenced): Observable.Context = SynchronizationContext.Current; var mousemove = Observable.FromEvent<MouseEventArgs>(this, "MouseMove"); var message = "Time flies like an arrow".ToCharArray(); for(int i = 0; i < message.Length; i++) { var l = new Label() { Text = message[i].ToString(), AutoSize = true, TextAlign = ContentAlignment.MiddleCenter }; int closure = i; mousemove .Delay(closure * 150) .Subscribe(e => { l.Left = e.EventArgs.X + closure * 15 + 10; l.Top = e.EventArgs.Y; //Debug.WriteLine(l.Text); }); Controls.Add(l); } When I move the mouse, the letters seem to get moved in a random order, and if I uncomment the Debug line, I see multiple events for the same letter... Any ideas? I've tried Throttle, but it doesn't seem to make any difference. Am I just asking too much of WinForms to move all those labels around? (Cross posted on Rx Forum)

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  • What's the "best" database for embedded?

    - by mawg
    I'm an embedded guy, not a database guy. I've been asked to redesign an existing system which has bottlenecks in several places. The embedded device is based around an ARM 9 processor running at 220mHz. There should be a database of 50k entries (may increase to 250k) each with 1k of data (max 8 filed). That's approximate - I can try to get more precise figures if necessary. They are currently using SqlLite 2 and planning to move to SqlLite 3. Without starting a flame war - I am a complete d/b newbie just seeking advice - is that the "best" decision? I realize that this might be a "how long is a piece of string?" question, but any pointers woudl be greatly welcomed. I don't mind doing a lot of reading & research, but just hoped that you could get me off to a flying start. Thanks. p.s Again, a total rewrite, might not even stick with embedded Linux, but switch to eCos, don't worry too much about one time conversion between d/b formats. Oh, and accesses should be infrequent, at most one every few seconds. edit: ok, it seems they have 30k entries (may reach 100k or more) of only 5 or 6 fields each, but at least 3 of them can be a search key for a record. They are toying with "having no d/b at all, since the data are so simple", but it seems to me that with multiple keys, we couldn't use fancy stuff like a quicksort() type search (recursive, binary search). Any thoughts on "no d/b", just data-structures? Btw, one key is 800k - not sure how well SqlLite handles that (maybe with "no d/b" I have to hash that 800k to something smaller?)

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  • Cannot use READPAST in snapshot isolation mode

    - by Marcus
    I have a process which is called from multiple threads which does the following: Start transaction Select unit of work from work table with by finding the next row where IsProcessed=0 with hints (UPDLOCK, HOLDLOCK, READPAST) Process the unit of work (C# and SQL stored procedures) Commit the transaction The idea of this is that a thread dips into the pool for the "next" piece of work, and processes it, and the locks are there to ensure that a single piece of work is not processed twice. (the order doesn't matter). All this has been working fine for months. Until today that is, when I happened to realise that despite enabling snapshot isolation and making it the default at the database level, the actual transaction creation code was manually setting an isolation level of "ReadCommitted". I duly changed that to "Snapshot", and of course immediately received the "You can only specify the READPAST lock in the READ COMMITTED or REPEATABLE READ" error message. Oops! The main reason for locking the row was to "mark the row" in such a way that the "mark" would be removed when the transaction that applied the mark was committed and the lock seemed to be the best way to do this, since this table isn't read otherwise except by these threads. If I were to use the IsProcessed flag as the lock, then presumably I would need to do the update first, and then select the row I just updated, but I would need to employ the NOLOCK flag to know whether any other thread had set the flag on a row. All sounds a bit messy. The easiest option would be to abandon the snapshot isolation mode altogether, but the design of step #3 requires it. Any bright ideas on the best way to resolve this problem? Thanks Marcus

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  • nHibernate, Automapping and Chained Abstract Classes

    - by Mr Snuffle
    I'm having some trouble using nHibernate, automapping and a class structure using multiple chains of abstract classes It's something akin to this public abstract class AbstractClassA {} public abstract class AbstractClassB : AbstractClassA {} public class ClassA : AbstractClassB {} When I attempt to build these mappings, I receive the following error "FluentNHibernate.Cfg.FluentConfigurationException was unhandled Message: An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail. Database was not configured through Database method." However, if I remove the abstract keyword from AbstractClassB, everything works fine. The problem only occurs when I have more than one abstract class in the class hierarchy. I've manually configured the automapping to include both AbstractClassA and AbstractClassB using the following binding class public class BindItemBases : IManualBinding { public void Bind(FluentNHibernate.Automapping.AutoPersistenceModel model) { model.IncludeBase<AbstractClassA>(); model.IncludeBase<AbstractClassB>(); } } I've had to do a bit of hackery to get around this, but there must be a better way to get this working. Surely nHibernate supports something like this, I just haven't figured out how to configure it right. Cheers, James

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  • Page.User.Identity.Name is blank on pages of subdomains

    - by sparks
    I have multiple subdomains trying to use a single subdomain for authentiction using forms authentication all running on windows server 2008 r2. All of the forms authentication pages are setup to use the same name, and on the authentication page the cookie is added with the following snippet: FormsAuthentication.SetAuthCookie(txtUserName.Text, false); System.Web.HttpCookie MyCookie = System.Web.Security.FormsAuthentication.GetAuthCookie(User.Identity.Name.ToString(), false); MyCookie.Domain = ConfigurationManager.AppSettings["domainName"]; Response.AppendCookie(MyCookie); When I am logged in to signon.mysite.com the page.user.identity.isauthenticated and page.user.identity.name properties both work fine. When I navigate to subdomain.mysite.com the page.user.identity.isauthenticated returns true, bue the name is empty. I tried to retrieve it from the cookie using the following, but it also was blank. HttpCookie cookie = Request.Cookies[".ASPXAUTH"]; FormsAuthenticationTicket fat = FormsAuthentication.Decrypt(cookie.Value); user2_lbl.Text = fat.Name; When googling the issue I found some people saying something must be added to global.asax and other saying it wasn't necessary. The goal is to be able to login on the authentication subdomain and have the user identity accessible from the root site and other subdomains. Machine keys match in all web.config, and the AppSettings["domainName"] is set to "mysite.com" currently. Does anyone know what is preventing me from accessing the user information?

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  • java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest

    - by pAkY88
    I'm developing a servlet that receives a multipart request with content of multiple files, and I'm using apache commons file upload libraries. When I call parseRequest(request); method servlet throws following exception: GRAVE: Servlet.service() for servlet DiffOntology threw exception java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest at org.apache.commons.fileupload.servlet.ServletRequestContext.getContentType(ServletRequestContext.java:73) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.(FileUploadBase.java:882) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:349) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126) at DiffOntology.doPost(DiffOntology.java:38) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) I put all libraries in WEB-INF/lib.

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  • Concatenate row values T-SQL

    - by Robert
    I am trying to pull together some data for a report and need to concatenate the row values of one of the tables. Here is the basic table structure: Reviews ReviewID ReviewDate Reviewers ReviewerID ReviewID UserID Users UserID FName LName This is a M:M relationship. Each Review can have many Reviewers; each User can be associated with many Reviews. Basically, all I want to see is Reviews.ReviewID, Reviews.ReviewDate, and a concatenated string of the FName's of all the associated Users for that Review (comma delimited). Instead of: ReviewID---ReviewDate---User 1----------12/1/2009----Bob 1----------12/1/2009----Joe 1----------12/1/2009----Frank 2----------12/9/2009----Sue 2----------12/9/2009----Alice Display this: ReviewID---ReviewDate----Users 1----------12/1/2009-----Bob, Joe, Frank 2----------12/9/2009-----Sue, Alice I have found this article describing some ways to do this, but most of these seem to only deal with one table, not multiple; unfortunately, my SQL-fu is not strong enough to adapt these to my circumstances. I am particularly interested in the example on that site which utilizes FOR XML PATH() as that looks the cleanest and most straight forward. SELECT p1.CategoryId, ( SELECT ProductName + ', ' FROM Northwind.dbo.Products p2 WHERE p2.CategoryId = p1.CategoryId ORDER BY ProductName FOR XML PATH('') ) AS Products FROM Northwind.dbo.Products p1 GROUP BY CategoryId; Can anyone give me a hand with this? Any help would be greatly appreciated!

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  • Kruskal-Wallis test with details on pairwise comparisons

    - by dalloliogm
    The standard stats::kruskal.test module allows to calculate the kruskal-wallis test on a dataset: >>> data(diamonds) >>> kruskal.test.test(price~carat, data=diamonds) Kruskal-Wallis rank sum test data: price by carat by color Kruskal-Wallis chi-squared = 50570.15, df = 272, p-value < 2.2e-16 this is correct, it is giving me a probability that all the groups in the data have the same mean. However, I would like to have the details for each pair comparison, like if diamonds of colors D and E have the same mean price, as some other softwares do (SPSS) when you ask for a Kruskal test. I have found kruskalmc from the package pgirmess which allows me to do what I want to do: > kruskalmc(diamonds$price, diamonds$color) Multiple comparison test after Kruskal-Wallis p.value: 0.05 Comparisons obs.dif critical.dif difference D-E 571.7459 747.4962 FALSE D-F 2237.4309 751.5684 TRUE D-G 2643.1778 726.9854 TRUE D-H 4539.4392 774.4809 TRUE D-I 6002.6286 862.0150 TRUE D-J 8077.2871 1061.7451 TRUE E-F 2809.1767 680.4144 TRUE E-G 3214.9237 653.1587 TRUE E-H 5111.1851 705.6410 TRUE E-I 6574.3744 800.7362 TRUE E-J 8649.0330 1012.6260 TRUE F-G 405.7470 657.8152 FALSE F-H 2302.0083 709.9533 TRUE F-I 3765.1977 804.5390 TRUE F-J 5839.8562 1015.6357 TRUE G-H 1896.2614 683.8760 TRUE G-I 3359.4507 781.6237 TRUE G-J 5434.1093 997.5813 TRUE H-I 1463.1894 825.9834 TRUE H-J 3537.8479 1032.7058 TRUE I-J 2074.6585 1099.8776 TRUE However, this package only allows for one categoric variable (e.g. I can't study the prices clustered by color and by carat, as I can do with kruskal.test), and I don't know anything about the pgirmess package, whether it is maintained or not, or if it is tested. Can you recommend me a package to execute the Kruskal-Wallis test which returns details for every comparison? How would you handle the problem?

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  • Status of VB6/ Best Desktop Application Language with Native Compliation

    - by Sandeep Jindal
    Hi, I was looking for a Desktop Application Programming Language with one of the biggest constraint: - “ I need to output as native executable”. I explored multiple options: a) Java is not a very good option for desktop programming, but still you can use it. But Java to Exe is a problem. [Only GCJ and Excelsior-Jet provides this][1]. b) .Net platform does not support native compilation. Only very few expensive tools are available which can do the job. c) Python is not an option for native compilation. Right? d) VB6 is the option I am left with. From the above list, if I am correct, VB6 is the only and probably the best option I have. But VB6 itself has issues like: a) It is no more under development since 2003. b) There are questions on support of VB6 IDE with Vista. Thus my questions are: a) From the list of programming language options, do you want to add any more? b) If VB6 is good/best option, looking at its development status, would you suggest using VB6 in this era? Regards Sandeep Jindal

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