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• Determine whether .NET assemblies were built from the same source

  - by Clayton

  Does anyone know of a way to compare two .NET assemblies to determine whether they were built from the "same" source files? I am aware that there are some differencing utilities available, such as the plugin for Reflector, but I am not interested in viewing differences in a GUI, I just want an automated way to compare a collection of binaries to see whether they were built from the same (or equivalent) source files. I understand that multiple different source files could produce the same IL, and realise that the process would only be sensitive to differences in the IL, not the original source. The main obstacle to just comparing the byte streams for the two assemblies is that .NET includes a field called "MVID" (Module Version Identifier) the assembly. This appears to have a different value for every compilation, so if you build the same code twice the assembly will be different. A related question is, does anyone know how to force the MVID to be the same for each compilation? This would avoid us needing to have a comparison process that is insensitive to differences in the value of the MVID. A consistent MVID would be preferable, as this means that standard checksums could be used. The background behind this is that a third-party company is responsible for independently reviewing and signing off our releases, prior to us being permitted to release to Production. This includes reviewing the source code. They want to independently confirm that the source code we give them matches the binaries that we earlier built, tested and currently plan to deploy. We are looking for a process that allows them to independently build the system from the source we supply them with, and the compare the checksums against the checksums for the binaries we have tested. thanks

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• Do I really need an ORM?

  - by alchemical

  We're about to begin development on a mid-size ASP.Net MVC 2 web site. For a typical page, we grab data and throw it up on the web page, i.e. there is not much pre-processing of the data before it is sent to the UI. We're now making the decision whether or not to use an ORM and if yes, which one. We had been looking at EF2 AKA EF4 (ASP.Net Entity Framework in VS 2010) as one possibility. However, I'm thinking a simple solution in this case may be just to use datatables. The reason being that we don't plan to move the data around or process it a lot once we fetch it, so I'm not sure there is that much value in having strongly-typed objects as DTOs. Also, this way we avoid mapping altogether, thereby I think simplifying the code and allowing for faster development. I should mention budget is an issue on this project, as well as speed of execution. We are striving for simplicity anywhere we can, both to keep the budget smaller, the schedule shorter, and performance fast. We haven't fully decided this yet, but are currently leaning towards no ORM. Will we be OK with the no ORM approach or is an ORM worth it?

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• Cannot convert IAsyncResult to AsyncResult when using a service refrence

  - by Scott Chamberlain

  I have a WCF service running, I added a reference to the service by using Add Service Reference in the solution explorer, and I checked the box for create asynchronous operations. My call works fine, I have a two way channel that reports back some events from the server and I am receiving the events. However, when the asynchronous task finishes in my callback handeler I get the error Unable to cast object of type 'SendAsyncResult' to type 'System.Runtime.Remoting.Messaging.AsyncResult'. Code that calls the method. DatabaseManagement.DatabaseManagementClient d = new DatabaseManagement.DatabaseManagementClient(new InstanceContext(new DatabaseManagementCallback())); d.Open(); d.BeginCreateDatabase("", "PreConfSA", "_test", new AsyncCallback(BeginCreateDatabaseCallback), null); The Async callback static void BeginCreateDatabaseCallback(IAsyncResult ar) { AsyncResult result = (AsyncResult)ar; //Execption happens here DatabaseManagement.DatabaseManagementClient caller = (DatabaseManagement.DatabaseManagementClient)result.AsyncDelegate; Console.WriteLine(caller.EndCreateDatabase(ar)); //Do more stuff here } Execption Details System.InvalidCastException was unhandled by user code Message=Unable to cast object of type 'SendAsyncResult' to type 'System.Runtime.Remoting.Messaging.AsyncResult'. Source=Sandbox Console StackTrace: at Sandbox_Console.Program.BeginCreateDatabaseCallback(IAsyncResult ar) in E:\Visual Studio 2010\Projects\Sandbox Console\Program.cs:line 26 at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously) InnerException: I don't really need the result from the EndCreateDatabase but everywhere I read it says that you must call EndYouFunctionHere() or bad things happen. Any recomendations?

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• Lazy-loading with Spring HibernateDaoSupport ?

  - by umanga

  Greetings I am developing a non-webapplication using Spring+Hibernate. My question is how the HibernateDaoSupport handles lazy-loading , because after a call do DAO , the Session is closed. Take a look at following psuedo-code: DAO is like: CommonDao extends HibernateDaoSupport{ Family getFamilyById(String id); SubFamily getSubFamily(String familyid,String subfamilyid); } Domain model is like: Family{ private List<SubFamily> subfamiles; public List<SubFamily> getSubFamiles(); } SubFamily{ private Family family; public Family getFamily(); } In the application I get DAO from app-context and want to following operations.Is this possible to do with lazy-loading because AFAIK after every method (getFamilyById() , getSubFamily() ) the session is closed. CommonDAO dao=//get bean from application context; Family famA=dao.getFamilyById(familyid); // //Do some stuff List<SubFamily> childrenA=fam.getSubFamiles(); SubFamily asubfamily=dao.getSubFamily(id,subfamilyid); // //Do some other stuff Family famB=asubfamily.getFamily();

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• Change namespace Prefix WCF Envelope

  - by activebiz

  I was wondering is there anyway to change the namespace prefix for the WCF SOAP request? As you can see in the example below, The Envelope has namespace "http://www.w3.org/2005/08/addressing" with prefix 'a'. I want to change this to 'foo'. How can I do that. Note I dont have control over service code I can only create proxy class from the WSDL . <s:Envelope xmlns:a="http://www.w3.org/2005/08/addressing" xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"> <s:Header> <a:Action s:mustUnderstand="1">http://www.starstandards.org/webservices/2005/10/transport/operations/MyAction</a:Action> <h:payloadManifest xmlns="http://www.starstandards.org/webservices/2005/10/transport" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:h="http://www.starstandards.org/webservices/2005/10/transport"> <manifest contentID="Content0" namespaceURI="http://www.starstandard.org/STAR/5" element="TESTMETHOD" version="5.2.4"></manifest> </h:payloadManifest> <h:Identity xmlns="urn:xxx/xxx/" xmlns:h="urn:xxx/xxx"> <SiteCode>XXXXXX</SiteCode> </h:Identity> <a:To>urn:xxx/xxx/Method1</a:To> <MessageID xmlns="http://www.w3.org/2005/08/addressing">XXXXX</MessageID> <a:ReplyTo> <a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address> </a:ReplyTo> </s:Header> Many thanks

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• JQuery fadeIn() moving other CSS elements on fadeIn()

  - by Infiniti Fizz

  Hi, I've just been learning some jQUery to get a basic image gallery going on a website I'm creating for a hotel but it's currently not going to plan. I've got it so the arrows will cycle through images (no animation yet) but I decided that the arrows should fade in when the image is hovered over and fade out when not but this is messing up the CSS somehow. The arrows start faded out by calling: $('.arrowRight').fadeOut(0);$('.arrowLeft').fadeOut(0); at the start of the jQuery ready() function. This is fine, but when you hover over the image and the arrows fade in, the image shifts to the right and I don't know why. I suppose it could be because the left arrow now fading in means it is getting pushed over by it but the arrow has the following css: position:relative; top: -90px; left: 25px; Should a relative element be able to alter a normal element's position? If you need to try it out, just hover over the large (placeholder) image and they image will jump across when the arrows fade in and jump back when they fade out. Any ideas why this is happening? I'm a jQuery noob. Here is a link to the page: BeanSheaf Hotel Temporary Space Thanks for your time, InfinitiFizz

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• Shift-reduce: when to stop reducing?

  - by Joey Adams

  I'm trying to learn about shift-reduce parsing. Suppose we have the following grammar, using recursive rules that enforce order of operations, inspired by the ANSI C Yacc grammar: S: A; P : NUMBER | '(' S ')' ; M : P | M '*' P | M '/' P ; A : M | A '+' M | A '-' M ; And we want to parse 1+2 using shift-reduce parsing. First, the 1 is shifted as a NUMBER. My question is, is it then reduced to P, then M, then A, then finally S? How does it know where to stop? Suppose it does reduce all the way to S, then shifts '+'. We'd now have a stack containing: S '+' If we shift '2', the reductions might be: S '+' NUMBER S '+' P S '+' M S '+' A S '+' S Now, on either side of the last line, S could be P, M, A, or NUMBER, and it would still be valid in the sense that any combination would be a correct representation of the text. How does the parser "know" to make it A '+' M So that it can reduce the whole expression to A, then S? In other words, how does it know to stop reducing before shifting the next token? Is this a key difficulty in LR parser generation?

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• Opinions on Unladen Swallow?

  - by vartec

  What are your opinions and expectations on Google's Unladen Swallow? From their project plan: We want to make Python faster, but we also want to make it easy for large, well-established applications to switch to Unladen Swallow. Produce a version of Python at least 5x faster than CPython. Python application performance should be stable. Maintain source-level compatibility with CPython applications. Maintain source-level compatibility with CPython extension modules. We do not want to maintain a Python implementation forever; we view our work as a branch, not a fork. And even sweeter: In addition, we intend to remove the GIL and fix the state of multithreading in Python. We believe this is possible through the implementation of a more sophisticated GC It almost looks too good to be true, like the best of PyPy and Stackless combined. More info: Jesse Noller: "Pycon: Unladen-Swallow" ArsTechnica: "Google searches for holy grail of Python performance" Update: as DNS pointed out, there was related question: http://stackoverflow.com/questions/695370/what-is-llvm-and-how-is-replacing-python-vm-with-llvm-increasing-speeds-5x

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• Hidden features of Perl?

  - by Adam Bellaire

  What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? Guidelines: Try to limit answers to the Perl core and not CPAN Please give an example and a short description Hidden Features also found in other languages' Hidden Features: (These are all from Corion's answer) C# Duff's Device Portability and Standardness Quotes for whitespace delimited lists and strings Aliasable namespaces Java Static Initalizers JavaScript Functions are First Class citizens Block scope and closure Calling methods and accessors indirectly through a variable Ruby Defining methods through code PHP Pervasive online documentation Magic methods Symbolic references Python One line value swapping Ability to replace even core functions with your own functionality Other Hidden Features: Operators: The bool quasi-operator The flip-flop operator Also used for list construction The ++ and unary - operators work on strings The repetition operator The spaceship operator The || operator (and // operator) to select from a set of choices The diamond operator Special cases of the m// operator The tilde-tilde "operator" Quoting constructs: The qw operator Letters can be used as quote delimiters in q{}-like constructs Quoting mechanisms Syntax and Names: There can be a space after a sigil You can give subs numeric names with symbolic references Legal trailing commas Grouped Integer Literals hash slices Populating keys of a hash from an array Modules, Pragmas, and command-line options: use strict and use warnings Taint checking Esoteric use of -n and -p CPAN overload::constant IO::Handle module Safe compartments Attributes Variables: Autovivification The $[ variable tie Dynamic Scoping Variable swapping with a single statement Loops and flow control: Magic goto for on a single variable continue clause Desperation mode Regular expressions: The \G anchor (?{}) and '(??{})` in regexes Other features: The debugger Special code blocks such as BEGIN, CHECK, and END The DATA block New Block Operations Source Filters Signal Hooks map (twice) Wrapping built-in functions The eof function The dbmopen function Turning warnings into errors Other tricks, and meta-answers: cat files, decompressing gzips if needed Perl Tips See Also: Hidden features of C Hidden features of C# Hidden features of C++ Hidden features of Java Hidden features of JavaScript Hidden features of Ruby Hidden features of PHP Hidden features of Python

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• If statement with code on same block in haml, RoR

  - by Micke

  Hello, i have this Haml view: !!! strict %html{:xmlns => "http://www.w3.org/1999/xhtml"} %head %meta{:content => "text/html; charset=utf-8", "http-equiv" => "Content-Type"} %title Lighty | #{@page_title || "Home"} %body #popup Login here #fade #wrapper #container #header %a#logo{:href => "/"} #menu %ul#main %li#lighty %a{:href => "/"} Lighty %ul %li %a Link here %li#community %a{:href => "/community"} Community #content And i would like to add an if on line #16 to check if it is the currently visited page and add the class "active" to the li if it returns true. How do i write that if statement there and is there any easier way to do this? My plan now is to use a variable like @current_page and testif it @current_page == "community" and add a class if it returns right. Am i thinking wrong? any easier way to accomplish this? Thanks for your answer and sorry for my bad english.

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• Named pipe blocking with user nobody

  - by dnagirl

  I have 2 short scripts. The first, an awk script, processes a large file and prints to a named pipe 'myfifo.dat'. The second, a Perl script, runs a LOAD DATA LOCAL INFILE 'myfifo.dat'... command. Both of these scripts work when run locally like so: lee.awk big.file & lee.pl However, when I call these scripts from a PHP webpage, the named pipe blocks: $awk="/path/to/lee.awk {$_FILES['uploadfile']['tmp_name']} &"; $sql="/path/to/lee.pl"; if(!exec($awk,$return,$err)) throw new ZException(print_r($err,true)); //blocks here if(!exec($sql,$return,$err)) throw new ZException(print_r($err,true)); If I modify the awk and Perl scripts so that they write and read to a normal file, everything works fine from PHP. The permissions on the fifo and the normal file are 666 (for testing purposes). These operations run much more quickly through a named pipe, so I'd prefer to use one. Any ideas how to unblock it? ps. In case you're wondering why I'm going to all this aggravation, see this SO question.

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• Best method of achieving bi-directional communication between Apple iPad "clients" and a Windows Ser

  - by user361910

  We are currently starting to build a client-server system which will see 10 or more Apple iPad client devices communicating to a central Windows server over a wireless LAN. We wanted to some existing plumbing (.NET remoting/WCF/web services/etc) that would allow us to implement a reliable, secure solution without having to start at a low level (e.g. sockets) and recreate the wheel. One of the major requirements that complicates this scenario is that unlike a traditional web service, the windows server needs to be able to arbitrarily notify the clients whenever certain events occur -- so it is not a simple request/response scenario like the web. Initially, we were going to use Windows clients, so our plan was to use the full-duplex mode of .NET WCF over HTTP|TCP. But now using the iPad, we don't have any of the WCF infrastructure. So my question is: what is the best way to allow an iPad and a Windows server to (securely) communicate over a LAN, with each device able to initiate communication to the other? Am I stuck writing low-level socket code? Thanks!

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• Creating custom IP-STS for sharepoint foundation 2010 without ADFS

  - by user252229

  I plan to create very simple custom IP-STS for SharePoint foundation 2010 without ADFS server so anyone can integrate Windows Live ID to SharePoint foundation 2010 simply without ADFS, I can't use ADFS server because it could not install on Windows Web Server 2008 (Web Edition), also I found many article use LDAP provider but it does not exists in SharePoint Foundation too (it requires Sharepoint Server Edition). After too much searching I just found the following article and find all technique except one problem. 1) Creating Custom Claim Provider: blogs.technet.com/b/speschka/archive/2010/03/13/writing-a-custom-claims-provider-for-sharepoint-2010-part-1.aspx 2) Creating Custom STS Provider: http://blogs.msdn.com/b/chunliu/archive/2010/04/02/how-to-make-use-of-a-custom-ip-sts-with-sharepoint-2010-part-1.aspx Only one step remains: I got following error after enter username in STS site and redirect to localhost/_trust/default.aspx , ( I leave EncryptingCertificateName empty). Operation is not valid due to the current state of the object I expect to get access denied error instead of that error. 1.Is it possible anyway? 2.Can anyone help me where can I find working article to create custom IP-STS without ADFS server Any idea will help me Thanks

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• (1 2 3 . #<void>)- heapsort

  - by superguay

  Hello everybody: I tried to implement a "pairing heap" with all the regular operations (merge, delete-min etc.), then I've been requested to write a function that would sort a list using my newly constructed heap implementation. Unfortunately it seems that someting goes wrong... Here's the relevant code: (define (heap-merge h1 h2) (cond ((heap-empty? h1) h2) ((heap-empty? h2) h1) (else (let ((min1 (heap-get-min h1)) (min2 (heap-get-min h2))) (if ((heap-get-less h1) min1 min2) (make-pairing-heap (heap-get-less h1) min1 (cons h2 (heap-get-subheaps h1))) (make-pairing-heap (heap-get-less h1) min2 (cons h1 (heap-get-subheaps h2)))))))) (define (heap-insert element h) (heap-merge (make-pairing-heap (heap-get-less h) element '()) h)) (define (heap-delete-min h) (define (merge-in-pairs less? subheaps) (cond ((null? subheaps) (make-heap less?)) ((null? (cdr subheaps)) (car subheaps)) (else (heap-merge (heap-merge (car subheaps) (cadr subheaps)) (merge-in-pairs less? (cddr subheaps)))))) (if (heap-empty? h) (error "expected pairing-heap for first argument, got an empty heap ") (merge-in-pairs (heap-get-less h) (heap-get-subheaps h)))) (define (heapsort l less?) (let aux ((h (accumulate heap-insert (make-heap less?) l))) (if (not (heap-empty? h)) (cons (heap-get-min h) (aux (heap-delete-min h)))))) And these are some selectors that may help you to understand the code: (define (make-pairing-heap less? min subheaps) (cons less? (cons min subheaps))) (define (make-heap less?) (cons less? '())) (define (heap-get-less h) (car h)) (define (heap-empty? h) (if (null? (cdr h)) #t #f)) Now lets get to the problem: When i run 'heapsort' it returns the sorted list with "void", as you can see: (heapsort (list 1 2 3) <) (1 2 3 . #)..HOW CAN I FIX IT? Regards, Superguay

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• Custom RoleProvider: Can't insert record in UsersInRole Table

  - by mahr.g.mohyuddin

  Hi, I have implemented a LINQ to SQL based RoleProvider, when I assign role to a user following exception is thrown while AddUsersToRoles method is called. I have defined a composite primary key userid & roleId on this table, it still throwing this exception: Can't perform Create, Update or Delete operations on 'Table(UsersInRole)' because it has no primary key. My LinQ to SQL implementation of AddUsersToRoles method is as follows. It breaks at db.UsersInRoles.InsertOnSubmit(userInRole); using (RussarmsDataContext db = new RussarmsDataContext()) { List<UsersInRole> usersInRole = new List<UsersInRole>(); foreach (string username in usernames) { foreach (string rolename in rolenames) { UsersInRole userInRole = new UsersInRole(); object userId = ProvidersUtility.GetUserIdByUserName(username,applicationName); object roleId = ProvidersUtility.GetRoleIdByRoleName(rolename,applicationName); if (userId != null && roleId != null) { userInRole.UserId = (Guid)userId; userInRole.RoleId = (Guid)roleId; db.UsersInRoles.InsertOnSubmit(userInRole); } } } try { // db.UsersInRoles.InsertAllOnSubmit(usersInRole); db.SubmitChanges(); } catch (ChangeConflictException) { db.ChangeConflicts.ResolveAll(RefreshMode.OverwriteCurrentValues); db.SubmitChanges(); } } Any help will be appreciated. Thanks.

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• XML Schema Migration

  - by Corwin Joy

  I am working on a project where we need to save data in an XML format. The problem is, over time we expect the format / schema for our data to change. What we want to be able to do is to produce scripts to migrate our data across different schema versions. We distribute our product to thousands of customers so we need to be able to run / apply these scripts at customer sites (so we can't just do the conversions by hand). I think that what we are looking for is some kind of XML data migration tool. In my mind the ideal tool could: Do an "XML diff" of two schema to identify added/deleted/changed nodes. Allow us to specify transformation functions. So, for example, we might add a new element to our schema that is a function of the old elements. (E.g. a new element C where C = A+B, A + B are old elements). So I think I am looking for a kind of XML diff and patch tool which can also apply transformation functions. One tool I am looking at for this is Altova's MapForce . I'm sure others here have had to deal with XML data format migration. How did you handle it? Edit: One point of clarification. The "diff" I plan to do is on the schema or .xsd files. The actual changes will be made to particular data sets that follow a given schema. These data sets will be .xml files. So its a "diff" of the schema to help figure out what changes need to be made to data sets to migrate them from one scheme to another.

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• Advice moving from Eclipse to xCode

  - by Gloin the Dark

  To xCode xPerts: I have been doing Java in Eclipse for about 9 years now and I have really gotten used to the power of the refactoring tools. There are a few operations I do all the time. I am looking for equivalents in xCode since it has better support for objective-c than eclipse. (I'm not at my Mac as I write this. So some of this is from memory. I am still very new to xCode.) 1 "rename". It seems that the xCode equivalent for variables is "edit all in scope". Does this work for files/classes/methods too? 2 "extract local variable" select an expression it creates a local var initialized to that expression. It even creates a usable name for the variable. 3 "extract method" select some code and it will create a method with that code and appropriate parameters/return value. 4 "inline" (variable or method) opposite of extract, inlines all or just the selected occurrence of the selected var or method. 5 "find next" occurrence of selected text. In eclipse I can select some text and hit ctrl-k to go to the next occurrence of that in the file. likewise shift-ctrl-k finds backwards. IIRC the xCode "find next" ignores the selection and only uses what is in the find box. 6 "change method signature" This would be very useful with ocjective-c's named parameter messaging syntax. This is great for adding parameters to a method. 7 "pull-up/push-down" for moving methods up or down the class hierarchy. 8 "move" for moving elements around to other classes etc. Those are the ones that I use all of the time. I have estimated that these tools cut my coding time in half. Are any of these supported in xCode? Thanks in advance for any advice.

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• adding controls dynamically to panel in a UpdatePanel asp.net 4.0

  - by softwaremonster

  Hi, I have a UpdatePanel includes some panels. I want to add to these panel some controls according to the operations. After i click any button twice or after first page load the page gives error. Either I have to use each panel without any post back [no page refresh] how can i solve this? the html code is below. wordOrgButton enables word panel and after any operation fills that word panel. same for userOrgButton <asp:UpdatePanel ID="mainPanel" runat="server" Height="220px"> <ContentTemplate> <fieldset> <asp:Panel ID="buttonsPanel" runat="server"> <asp:Button ID="wordOrgButton" runat="server" Text="Words" onclick="wordOrgButton_Click" /> <asp:Button ID="userOrgButton" runat="server" Text="User" onclick="userOrgButton_Click" /> <asp:Button ID="exitButton" runat="server" Text="Exit" onclick="exitButton_Click" /> </asp:Panel> <asp:Panel ID="usersPanel" runat="server"> <asp:TextBox ID="whoisUserTextBox" runat="server"></asp:TextBox> <asp:Button ID="catchUserButton" runat="server" Text="Bring" onclick="catchUserButton_Click" /> <asp:Panel ID="userOrgPanel" runat="server" ></asp:Panel> </asp:Panel> <asp:Panel ID="wordsPanel" runat="server"></asp:Panel> <asp:Panel ID="informationPanel" runat="server"> <asp:Label ID="operationinfoLabel" runat="server"></asp:Label> </asp:Panel> </fieldset> </ContentTemplate> </asp:UpdatePanel>

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• Complex data types in WCF?

  - by Hojou

  I've run into a problem trying to return an object that holds a collection of childobjects that again can hold a collection of grandchild objects. I get an error, 'connection forcibly closed by host'. Is there any way to make this work? I currently have a structure resembling this: pseudo code: Person: IEnumerable<Order> Order: IEnumberable<OrderLine> All three objects have the DataContract attribute and all public properties i want exposed (including the IEnumerable's) have the DataMember attribute. I have multiple OperationContract's on my service and all the methods returning a single object OR an IEnumerable of an object works perfectly. It's only when i try to nest IEnumerable that it turns bad. Also in my client service reference i picked the generic list as my collection type. I just want to emphasize, only one of my operations/methods fail with this error - the rest of them work perfectly. EDIT (more detailed error description): [SocketException (0x2746): An existing connection was forcibly closed by the remote host] [IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.] [WebException: The underlying connection was closed: An unexpected error occurred on a receive.] [CommunicationException: An error occurred while receiving the HTTP response to http://myservice.mydomain.dk/MyService.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.] I tried looking for logs but i can't find any... also i'm using a WSHttpBinding and an http endpoint.

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• Nature of Lock is child table while deletion(sql server)

  - by Mubashar Ahmad

  Dear Devs From couple of days i am thinking of a following scenario Consider I have 2 tables with parent child relationship of kind one-to-many. On removal of parent row i have to delete the rows in child those are related to parents. simple right? i have to make a transaction scope to do above operation i can do this as following; (its psuedo code but i am doing this in c# code using odbc connection and database is sql server) begin transaction(read committed) Read all child where child.fk = p1 foreach(child) delete child where child.pk = cx delete parent where parent.pk = p1 commit trans OR begin transaction(read committed) delete all child where child.fk = p1 delete parent where parent.pk = p1 commit trans Now there are couple of questions in my mind Which one of above is better to use specially considering a scenario of real time system where thousands of other operations(select/update/delete/insert) are being performed within a span of seconds. does it ensure that no new child with child.fk = p1 will be added until transaction completes? If yes for 2nd question then how it ensures? do it take the table level locks or what. Is there any kind of Index locking supported by sql server if yes what it does and how it can be used. Regards Mubashar

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• fabric deploy problem

  - by alexarsh

  Hi, I'm trying to deploy a django app with fabric and get the following error: Alexs-MacBook:fabric alex$ fab config:instance=peergw deploy -H <ip> - u <username> -p <password> [192.168.2.93] run: cat /etc/issue Traceback (most recent call last): File "build/bdist.macosx-10.6-universal/egg/fabric/main.py", line 419, in main File "/Users/alex/Rabota/server/mx30/scripts/fabric/fab/ commands.py", line 37, in deploy checkup() File "/Users/alex/Rabota/server/mx30/scripts/fabric/fab/ commands.py", line 140, in checkup if not 'Ubuntu' in run('cat /etc/issue'): File "build/bdist.macosx-10.6-universal/egg/fabric/network.py", line 382, in host_prompting_wrapper File "build/bdist.macosx-10.6-universal/egg/fabric/operations.py", line 414, in run File "build/bdist.macosx-10.6-universal/egg/fabric/network.py", line 65, in __getitem__ File "build/bdist.macosx-10.6-universal/egg/fabric/network.py", line 140, in connect File "build/bdist.macosx-10.6-universal/egg/paramiko/client.py", line 149, in load_system_host_keys File "build/bdist.macosx-10.6-universal/egg/paramiko/hostkeys.py", line 154, in load File "build/bdist.macosx-10.6-universal/egg/paramiko/hostkeys.py", line 66, in from_line File "build/bdist.macosx-10.6-universal/egg/paramiko/rsakey.py", line 61, in __init__ paramiko.SSHException: Invalid key Alexs-MacBook:fabric alex$ I can't connect to the server via ssh. What can be my problem? Regards, Arshavski Alexander.

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• Java Simple Chat Box

  - by Allen

  I am trying to create a very simple chat window that simply has the ability to display some text, which i add to from time to time. However I get the following run time error when attempting to append text to the window: java.lang.ClassCastException: javax.swing.JViewport cannot be cast to javax.swing.JTextPane at ChatBox.getTextPane(ChatBox.java:41) at ChatBox.getDocument(ChatBox.java:45) at ChatBox.addMessage(ChatBox.java:50) at ImageTest2.main(ImageTest2.java:160) Here is the class to handle the basic operations: public class ChatBox extends JScrollPane { private Style style; public ChatBox() { StyleContext context = new StyleContext(); StyledDocument document = new DefaultStyledDocument(context); style = context.getStyle(StyleContext.DEFAULT_STYLE); StyleConstants.setAlignment(style, StyleConstants.ALIGN_LEFT); StyleConstants.setFontSize(style, 14); StyleConstants.setSpaceAbove(style, 4); StyleConstants.setSpaceBelow(style, 4); JTextPane textPane = new JTextPane(document); textPane.setEditable(false); this.add(textPane); } public JTextPane getTextPane() { return (JTextPane) this.getComponent(0); } public StyledDocument getDocument() { return (StyledDocument) getTextPane().getStyledDocument(); } public void addMessage(String speaker, String message) { String combinedMessage = speaker + ": " + message; StyledDocument document = getDocument(); try { document.insertString(document.getLength(), combinedMessage, style); } catch (BadLocationException badLocationException) { System.err.println("Oops"); } } } if there is a simpler way to do this, by all means let me know. I only need the text to be of a single font type, and uneditable by the user. Aside from that, I just need to be able to append text on the fly.

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• PyQt and unittest - how to handle signals and slots

  - by Einar

  Hello, some small application I'm developing uses a module I have written to check certain web services via a REST API. I've been trying to add unit tests to it so I don't break stuff, and I stumbled upon a problem. I use a lot of signal-slot connections to perform operations asynchronously. For example a typical test would be (pseudo-Python), with postDataDownloaded as a signal: def testConnection(self): "Test connection and posts retrieved" def length_test(): self.assertEqual(len(self.client.post_data), 5) self.client.postDataReady.connect(length_test) self.client.get_post_list(limit=5) Now, unittest will report this test to be "ok" when running, regardless of the result (as another slot is being called), even if asserts fail (I will get an unhandled AssertionError). Example when deliberatiely making the test fail: Test connection and posts retrieved ... ok [... more tests...] OK Traceback (most recent call last): [...] AssertionError: 4 != 5 The slot inside the test is merely an experiment: I get the same results if it's outside (instance method). I also have to add that the various methods I'm calling all make HTTP requests, which means they take a bit of time (I need to mock the request - in the mean time I'm using SimpleHTTPServer to fake the connections and give them proper data). Is there a way around this problem?

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• Assistance with building an inverted-index

  - by tipu

  It's part of an information retrieval thing I'm doing for school. The plan is to create a hashmap of words using the the first two letters of the word as a key and any words with the two letters saved as a string value. So, hashmap["ba"] = "bad barley base" Once I'm done tokenizing a line I take that hashmap, serialize it, and append it to the text file named after the key. The idea is that if I take my data and spread it over hundreds of files I'll lessen the time it takes to fulfill a search by lessening the density of each file. The problem I am running into is when I'm making 100+ files in each run it happens to choke on creating a few files for whatever reason and so those entries are empty. Is there any way to make this more efficient? Is it worth continuing this, or should I abandon it? I'd like to mention I'm using PHP. The two languages I know relatively intimately are PHP and Java. I chose PHP because the front end will be very simple to do and I will be able to add features like autocompletion/suggested search without a problem. I also see no benefit in using Java. Any help is appreciated, thanks.

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• C# Wholesale Order form - textboxes in Gridviews in Repeater

  - by tnriverfish

  I'm building a wholesale order form on a website. The current plan is to... -get an ArrayList of DepartmentUnits -a DepartmentUnit has various attributes like "deptId", "description" and its own ArrayList of StoreItems -The StoreItems have attached ArrayList of various SizeOptions -The SizeOptions have an inventory count integer along with their description -Planning on putting an asp:Repeater on the page that has an asp:GridView in it -Each DepartmentUnit will have its own GridView -EachStore item will have a row in the GridView -Each SizeOption will have a TextBox in the row (approximately 10 options) -Each inventory count will be watermarked over the size option textbox The question becomes how will I then collect all this information correctly once the form has been filled out? I don't like the idea of putting all this information in an update panel and then posting back each time a GridView row or worse one of the row's textboxes changes. Any advice on putting a single save button on the page and looping through each Repeater item - and each GridViewRow - and each textbox - to get all the values entered? Better to try collecting all the items added in a single table at the bottom of the page and updating the string with jquery each time a text box is modified? Then just looping through the new table when saved? Not sure I know how to loop through that table though - updating if quantity is changed might be a bear too. If it considerably simplifies the process I could just remove the Repeater aspect and put separate GridViews on separate pages. Thanks!

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