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• Row concat from this query

  - by Álvaro G. Vicario

  I have this query: SELECT DISTINCT IM.EDIFICIOS_ID, TI.TITULAR FROM IMPORTACION IM INNER JOIN I_EDIFICIO IE ON IM.IMPORTACION_ID=IE.IMPORTACION_ID INNER JOIN I_EDIFICIO_TITULAR ET ON IM.IMPORTACION_ID=ET.IMPORTACION_ID AND IE.EDIFICIO_ID=ET.EDIFICIO_ID INNER JOIN I_TITULAR TI ON IM.IMPORTACION_ID=TI.IMPORTACION_ID AND ET.TITULAR_ID=TI.TITULAR_ID WHERE TI.TITULAR IS NOT NULL AND TI.TITULAR<>'' ORDER BY IM.EDIFICIOS_ID, TI.TITULAR; that returns this result set: EDIFICIOS_ID TITULAR ------------ ------------------ 1911 Ana María García 1911 Anselmo Piedrahita 1911 Manuel López 2594 Carlos Pérez 2594 Felisa García 6865 Carlos Pérez 6865 Felisa García 8428 Carlos Pérez I want to concatenate the values from TITULAR for each EDIFICIOS_ID, so I get this: EDIFICIOS_ID TITULAR ------------ ------------------ 1911 Ana María García; Anselmo Piedrahita; Manuel López 2594 Carlos Pérez; Felisa García 6865 Carlos Pérez; Felisa García 8428 Carlos Pérez I'm trying to use the FOR XML PATH trick. I've used it in the past but, since I can't really understand how it works, I can't figure out how to apply it to this specific case. Can you provide me with some ideas?

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• How to do this GQL query in JDO

  - by TheDon

  I have about 50k entities stored in appengine. I am able to look up an individual record via the GQL admin interface with a query like: SELECT * FROM Pet where __key__ = KEY( 'Pet','Fido') But I'm having trouble figuring out how to do a batch version of this via JDO. Right now I have this: PersistenceManager pm = ...; for(Pet pet : pets) { for(String k : getAllAliases(pet)) { keys.add(KeyFactory.createKeyString(Pet.class.getSimpleName(), k)); } } Query q = pm.newQuery("select from " + Pet.class.getName() + " where id == :keys"); List<Pet> petlist = (List<Pet>) q.execute(keys); But though 'Fido' works in the GQL case, it returns nothing when I use that Java + JDO code. What am I doing wrong?

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• Repository pattern - Switch out the database and switch in XML files

  - by glasto red

  Repository pattern - Switch out the database and switch in XML files. Hello I have an asp.net MVC 2.0 project and I have followed the Repository pattern. Periodically, I am losing access to the database server so I want to have another mechanism in place (XML files) to continue developing. It is not possible to have a local version of the db unfortunately! I thought this would be relatively easy using the Repository pattern, to switch out the db repositories and switch in XML versions. However, I am having real trouble coming up with a solution. I have tried LinqToXML but then ran into problems trying to return a List of News items as the LinqToXML ToList returns Generic.List Should I be mapping the XElement list over to the News list by hand? It just seems a bit clunky compared to LinqToSQL attributes on the News class and then simply doing a Table.....ToList(); Any direction would be appreciated. Thanks

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• Eventlet client-server

  - by johannix

  I'm trying to setup a server-client interraction: Server gets a string from client Server returns data to client I got this working with socket.send and socket.recv, but was wondering how to get it working with files through socket.makefile. I've got most of the pieces working, but don't know how to force each of the pieces to read at the appropriate time. So what it looks like is happening is that both the client and server are reading on the socket at the same time. Any ideas on how to let the server complete the original read before the client starts waiting for its information? Below are the core pieces that reproduce the read lock. Server: def handle(green_socket): file_handler = green_socket.makefile('rw') print 'before server read' lines = file_handler.readlines() print "readlines: %s" % (lines) print '** Server started **' server = eventlet.listen((HOST, PORT)) pool = eventlet.GreenPool() while True: new_sock, address = server.accept() pool.spawn_n(handle, new_sock) Client: from eventlet.green import socket green_socket = eventlet.connect((HOST, PORT)) file_handler = green_socket.makefile('rw') print 'before write' file_handler.writelines('client message') file_handler.flush() print 'before client read' lines = file_handler.readlines()

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• NULL values in object properties in Entity Framework

  - by Tony

  Tables: Article, Author, Comment (1 article and 1 author can have * comments) In the database is 1 article, 1 author and 1 comment. The problem is, that code myBD my_bd = new myBD(); var articles = by_bd.Article; works OK, I can see that an Author and an Article has 1 comment. But that code var comm = (from u in my_bd.Comment where ...... select u); returns the comment but it has NULL values in property Article and Author. Why ?

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• WPF TypeConverter ConvertTo not firing

  - by JFoulkes

  Hi, I have a dependency property in a class which I need to be converted to a string. I have added the TypeConverty attribute on the property. The type I am converting is the .net Style class. [TypeConverter(typeof(BulletStyleTypeConverter))] public Style BulletStyle { get { return (Style)GetValue(BulletStyleProperty); } set { this.SetValue(BulletStyleProperty, value); } } When I put the string "Rectangle" in for BulletStyle in xaml it hits the ConvertFrom method in my converter. However, when I use XamlWriter.Save() to serialise this, the property does not appear as an attribute in the string which is produced. I have implemented ConvertTo and put a breakpoint on, which is never hit. I have implemented CanConvertTo and put a breakpoint on, which IS hit and returns true. So i'm stumped as to why ConvertTo never fires.

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• Unity IOC, AOP & Interface Interception

  - by krisg

  I've been playing around with Unity to do some AOP stuff, setting up via IOC like: ioc.RegisterType<ICustomerService, CustomerService>() .Configure<Interception>().SetInterceptorFor<ICustomerService>(new InterfaceInterceptor()); ... and then having an ICallHandler on the ICustomerService interface's methods. For teh time being i want to just get the method called, the class it's in, and the namespace for that class. So... inside the... public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) ...method of the ICallHandler, i can access the method name via input.MethodBase.Name... if i use input.MethodBase.DeclaringType.Name i get the interface ICustomerService... BUT... how would i go about getting the implementing class "CustomerService" rather than the interface? I've been told to use input.Target.. but that just returns "DynamicModule.ns.Wrapped_ICustomerService_4f2242e5e00640ab84e4bc9e05ba0a13" Any help on this folks?

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• Registry ReadString method is not working in Windows 7 in Delphi 7

  - by Tofig Hasanov

  The following code sample used to return me windows id before, but now it doesn't work, and returns empty string, dunno why. function GetWindowsID: string; var Registry: TRegistry; str:string; begin Registry := TRegistry.Create(KEY_WRITE); try Registry.Lazywrite := false; Registry.RootKey := HKEY_LOCAL_MACHINE; // Registry.RootKey := HKEY_CURRENT_USER; if CheckForWinNT = true then Begin if not Registry.OpenKeyReadOnly('\Software\Microsoft\Windows NT\CurrentVersion') then showmessagE('cant open'); end else Registry.OpenKeyReadOnly('\Software\Microsoft\Windows\CurrentVersion'); str := Registry.ReadString('ProductId'); result:=str; Registry.CloseKey; finally Registry.Free; end; // try..finally end; Anybody can help?

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• How to fix the size of the Hashtable and find the whether it has fix size or not?

  - by Vijjendra

  Hi All, I am trying to fix the size of the Hashtable with following code. Hashtable hashtable = new Hashtable(2); //Add elements in the Hashtable hashtable.Add("A", "Vijendra"); hashtable.Add("B", "Singh"); hashtable.Add("C", "Shakya"); hashtable.Add("D", "Delhi"); hashtable.Add("E", "Singh"); hashtable.Add("F", "Shakya"); hashtable.Add("G", "Delhi"); hashtable.Add("H", "Singh"); hashtable.Add("I", "Shakya"); hashtable.Add("J", "Delhi"); I have fix the size of this Hashtable is 2 but I can add more than 2 elements in this, why this happen, I am doing somthing wrong? I have tried to find out is this Hashtable have fix size of not with hashtable.IsFixedSize, it always returns false Please tell me where I am wrong, or there is another way..

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• Why is my implementation of the Sieve of Atkin overlooking numbers close to the specified limit?

  - by Ross G

  My implementation either overlooks primes near the limit or composites near the limit. while some limits work and others don't. I'm am completely confused as to what is wrong. def AtkinSieve (limit): results = [2,3,5] sieve = [False]*limit factor = int(math.sqrt(lim)) for i in range(1,factor): for j in range(1, factor): n = 4*i**2+j**2 if (n <= lim) and (n % 12 == 1 or n % 12 == 5): sieve[n] = not sieve[n] n = 3*i**2+j**2 if (n <= lim) and (n % 12 == 7): sieve[n] = not sieve[n] if i>j: n = 3*i**2-j**2 if (n <= lim) and (n % 12 == 11): sieve[n] = not sieve[n] for index in range(5,factor): if sieve[index]: for jndex in range(index**2, limit, index**2): sieve[jndex] = False for index in range(7,limit): if sieve[index]: results.append(index) return results For example, when I generate a primes to the limit of 1000, the Atkin sieve misses the prime 997, but includes the composite 965. But if I generate up the limit of 5000, the list it returns is completely correct.

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• Why is my implementation of the Sieve of Atkin overlooking numbers close to the specified limit?

  - by Ross G

  My implementation either overlooks primes near the limit or composites near the limit. while some limits work and others don't. I'm am completely confused as to what is wrong. def AtkinSieve (limit): results = [2,3,5] sieve = [False]*limit factor = int(math.sqrt(lim)) for i in range(1,factor): for j in range(1, factor): n = 4*i**2+j**2 if (n <= lim) and (n % 12 == 1 or n % 12 == 5): sieve[n] = not sieve[n] n = 3*i**2+j**2 if (n <= lim) and (n % 12 == 7): sieve[n] = not sieve[n] if i>j: n = 3*i**2-j**2 if (n <= lim) and (n % 12 == 11): sieve[n] = not sieve[n] for index in range(5,factor): if sieve[index]: for jndex in range(index**2, limit, index**2): sieve[jndex] = False for index in range(7,limit): if sieve[index]: results.append(index) return results For example, when I generate a primes to the limit of 1000, the Atkin sieve misses the prime 997, but includes the composite 965. But if I generate up the limit of 5000, the list it returns is completely correct.

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• XPath doesn't work as desired in C#

  - by Nick Brooks

  My code doesn't return the node XmlDocument xml = new XmlDocument(); xml.InnerXml = text; XmlNode node_ = xml.SelectSingleNode(node); return node_.InnerText; // node_ = null !!!!!!!!!!!!!!!!!!! I'm pretty sure my XML and Xpath are correct My Xpath : /ItemLookupResponse/OperationRequest/RequestId' My XML : <?xml version="1.0"?> <ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05"> <OperationRequest> <RequestId>xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx</RequestId> .......(the rest of the xml is irrelevant).......... The node my XPath returns is always null for some reason. Can someone help?

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• IEnumerable<T>.Concat -- A replacement that can work without changing the reference?

  - by Earlz

  Hello, I've recently been bitten by the (way too commmon in my opinion) gotcha of Concat returns it's result, rather than appending to the list itself. For instance. List<Control> mylist=new List<Control>; //.... after adding Controls into mylist MyPanel.Controls.Concat(mylist); //This will not affect MyPanel.Controls at all. MyPanel.Controls=MyPanel.Controls.Concat(mylist); //This is what is needed, but the Controls reference can not be reassigned (for good reason) So is there some other way of combining two lists that will work when the collection reference is read-only? Is the only way to do this with a foreach? foreach(var item in mylist){ MyPanel.Controls.Add(item); } Is there a better way without the foreach?

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• Javascript event chaining / binding

  - by Charlie Brown

  I have a select list which has a function with a jQuery .post bound on the change() event. <select id="location"> <option value="1"></option> <option value="2"></option> </select> $('#location').change(location_change); function location_change(){ var url = ''; $.post(url, callback); } What I would like to happen is other controls on the page can bind to the $.post callback function like it was an event, so after the location is changed the data is posted back to the server and once the post returns successfully, the subscriber events are fired.

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• JavaScript - string regex backreferences

  - by quano

  You can backreference like this in JavaScript: var str = "123 $test 123"; str = str.replace(/(\$)([a-z]+)/gi, "$2"); This would (quite silly) replace "$test" with "test". But imagine I'd like to pass the resulting string of $2 into a function, which returns another value. I tried doing this, but instead of getting the string "test", I get "$2". Is there a way to achieve this? // Instead of getting "$2" passed into somefunc, I want "test" // (i.e. the result of the regex) str = str.replace(/(\$)([a-z]+)/gi, somefunc("$2"));

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• Spring AOP: how to get the annotations of the adviced method

  - by hubertg

  I'd like to implement declarative security with Spring/AOP and annotations. As you see in the next code sample I have the Restricted Annotations with the paramter "allowedRoles" for defining who is allowed to execute an adviced method. @Restricted(allowedRoles="jira-administrators") public void setPassword(...) throws UserMgmtException { // set password code ... } Now, the problem is that in my Advice I have no access to the defined Annotations: public Object checkPermission(ProceedingJoinPoint pjp) throws Throwable { Signature signature = pjp.getSignature(); System.out.println("Allowed:" + rolesAllowedForJoinPoint(pjp)); ... } private Restricted rolesAllowedForJoinPoint(ProceedingJoinPoint thisJoinPoint) { MethodSignature methodSignature = (MethodSignature) thisJoinPoint.getSignature(); Method targetMethod = methodSignature.getMethod(); return targetMethod.getAnnotation(Restricted.class); } The method above always returns null (there are no annotations found at all). Is there a simple solution to this? I read something about using the AspectJ agent but I would prefer not to use this agent.

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• (R) How can I get the complement of vector y in vector x

  - by gd047

  That's x \ y using mathematical notation. Suppose x <- c(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2,1,1,1,3) y <- c(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1) How can I get a vector with ALL the values in x that are not in y. i.e the result should be: 2,1,1,3 There is a similar question here. However, none of the answers returns the result that I want.

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• Matlab - plot multiple data sets on a scatter plot

  - by Mark

  Hey all, I have 2 sets of data (Ax, Ay; Bx, By) - I'd like to plot both of these data sets on a scatter plot with different colors, but can't seem to get it to work because it seems scatter() does not work like plot(). Is it possible to do this? I've tried... scatter(Ax, Ay, 'g', Bx, By, 'b') And scatter(Ax, Ay, 'g') scatter(Bx, By, 'b') The first way returns an error. The latter only plots the Bx/By data. Many thanks!

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• Git checking out problem [fatal: early EOFs]

  - by Style

  Dear all, I'm running a Ubuntu (9.10) server with Git (latest from Ubuntu package manager) installed. Access to the Git is via SSH. On windows machines, I'm using Cygwin to push/pull code. I can push my project code onto the server but when I do a clone or pull, it returns a [fatal: early EOFs] error at about 75-80%. Upon further investigation, it seems like textual data has no issue when pulled/cloned but when the jar files and images are pulled from Git, the error will occur. Any suggestion/advice that can help to resolve this issue? Thanks in advance.

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• How to provide a fileDownloadName only if the user requests to save the file in ASP.NET MVC?

  - by davekaro

  I've got a controller action that returns a FileResult like this return this.File("file.pdf", "application/pdf"); for the URL "/Download/322" - where 322 is the id of the file. This works great, so that if a user clicks on a link to the PDF - it will open in their web browser as long as they have a PDF plugin installed. But, what if they right-click the link and choose "Save as..."? The browser pops up with the filename as "322." I'd like to have a better filename at this point, by doing something like this: return this.File("file.pdf", "application/pdf", "file.pdf"); But if I change the controller to return like that, then it will always pop up the download box, since MVC is setting the Content-Disposition header to attachment (so I can't embed the file). In summary, can I somehow detect that the user is trying to download the file vs. the file is just being embedded in something on the page?

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• Returning a byte array from activex to javascript

  - by vondip

  Hello all, I've built a small activex control using c#. I've got a function that returns an array of bytes. From some reason when I try to consue the returned array in js I receive an undefined value. Why is this happenning? Is there anyway to solve it? Here's a simple demonstration of my code: Activex: [ComVisible(true)] public byte[] Close() { try { MessageBox.Show("called from activex Close"); return Stop(); } catch (Exception e) { //ExceptionHandling.AppException(e); throw e; } } Javascript Call: function CloseActiveX(){ var myRslt = document.OurActiveX.Close(); }

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• How to get UIScrollView contentOffset during an animation

  - by user249488

  I am trying to get the contentOffset property of a UIScrollView in the middle of a setContentOffset animation. Note I am not using the animated property of the method, but instead enclosing the setContentOffset operation within a UIView animation block so I can have finer control. When I try to read the value of contentOffset in the middle of the animation, it returns the final value rather than the value at that moment. I know that you can use the presentationLayer to get the current layer, but is there any way you can get the current offset in the middle of an animation?

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• Memory management / ownership question?

  - by fuzzygoat

  Do I have this right ... // Reactor.h @property(nonatomic, retain) NSMutableArray *reactorCore; // Reactor.m [self setReactorCore:[NSKeyedUnarchiver unarchiveObjectWithFile:[self dataFilePath]]]; ... -(void)dealloc { [reactorCore release]; [super dealloc]; } I am pretty sure I am doing this right (but just wanted to check). By my way of thinking NSKeyedUnarchiver returns an object it owns, I am then taking ownership via the @property, later I release reactorCore and all is good?

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• Multipage WIA scan (docfeeder) scans 1 page and blocks scanner

  - by LRF

  Using C# (VS2008) and WIA - scanning to TIFF format; When I use the scanner for 1 page on the flatbed or document feeder the method executes without any problem. When I load multiple forms into the feeder the execution halts after scanning the first page (keeping status: "scanning to pc") but does not scan the next document(s). The method returns the stream of the first page and halts - am able to save the stream and everything; just am lost at what to do next... What statement am I missing? What am I missing here? TIA!

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• How to server-side cache ASP.NET custom HttpHandler response

  - by Joel

  I've got a custom HttpHandler in my ASP.NET application, that basically builds and returns a javascript object. I have no experience with server-side caching, and my (possibly incompetent) google searches aren't returning anything basic enough to get me started. Could anyone provide a very simple example to give me an idea of how to access and use the server-side cache from a custom HttpHandler, or, leave some links to get me started? Thanks a lot. Additional info: I'm on IIS 6, and my code-behind is in C# (although a VB example would work as well).

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