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• using Spring JdbcTemplate for multiple database operations

  - by Joel Carranza

  I like the apparent simplicity of JdbcTemplate but am a little confused as to how it works. It appears that each operation (query() or update()) fetches a connection from a datasource and closes it. Beautiful, but how do you perform multiple SQL queries within the same connection? I might want to perform multiple operations in sequence (for example SELECT followed by an INSERT followed by a commit) or I might want to perform nested queries (SELECT and then perform a second SELECT based on result of each row). How do I do that with JdbcTemplate. Am I using the right class?

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• Asp.net RenderControl method not rendering autopostback for dropdownlist

  - by Tanya

  Hi all, i am bit confused as to why asp.net does not render a dropdownlist with the autopostback property set to true when using the RenderControl method. eg Dim sw As New IO.StringWriter Dim tw As New HtmlTextWriter(sw) Dim table As New Table table.Rows.Add(New TableRow) Dim tr As TableRow = table.Rows(0) tr.Cells.Add(New TableCell) Dim tc As TableCell = tr.Cells(0) Dim ddlMyValues As New DropDownList ddlMyValues.ID = "ddl1" ddlMyValues.Items.Add("Test1") ddlMyValues.Items.Add("Test2") ddlMyValues.Items.Add("Test3") ddlMyValues.AutoPostBack = True tc.Controls.Add(ddlMyValues) table.RenderControl(tw) Debug.WriteLine(sw.ToString) my output renders the dropdown list without the onchange="javascript:setTimeout('__doPostBack(\ddl1\',\'\')', 0)" that is generated by asp.net when using the dropdownlist normally. Is there a work around to this?

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• Sharing application link via the same application, iphone

  - by Nithin

  Possible duplicate: How can i give app store link in my apps before approving another apps linking to an app on the Itunes store How to link to apps on the app store Hi all, I'm a littile bit confused. I need to provide the download link of my application (the iTunes link) inside my application. ie when the user would like to invite others via mail or some other means, have to provide the application link too with that.Is there any way to provide that before submitting the application to apple. Or i need to use the link as an update after getting my application approved by apple?

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• Getting the MODELVIEW matrix...

  - by james.ingham

  Hi, I've been pulling my hair out trying to get some matrix calculations working properly and started to wonder. If I have the following: glPushMatrix(); float m[16]; glGetFloatv(GL_MODELVIEW_MATRIX, m); glPopMatrix(); What should I expect the values of m to equal? Currently I'm getting these values and I'm confused as to where they're coming from: -1, 0, 0, 0, 0, -0.6139, 0.7893522, 0, 0, 0.789352238, 0.61394, 0, 0, 0.0955992, -1.344529, 1, I'm assuming there is something which affects this, but I'm not sure what. Could anyone help? I've tried changing pretty much anything but everytime I push the matrix stack I always get this matrix straight away! I don't think this makes a difference but I'm using OpenGLES. Thanks

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• Image scaling in C

  - by Ganesh

  Hi, I am designing a jpeg to bmp decoder which scales the image. I have been supplied with the source code for the decoder so my actual work is to design a scaler . I do not know where to begin. I have scouted the internet for the various scaling algorithms but am not sure where to introduce the scaling. So should I do the the scaling after the image is converted into bmp or should I do this during the decoding at the MCU level. am confused :( If you guys have some information to help me out, its appreciated. any material to read, source code to analyse etc....

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• WPF MediaPlayer doesn't play M4A?

  - by Nick

  I am trying to use a MediaPlayer instance to play M4A files. For those of you that aren't familiar, MediaPlayer is the non-XAML version of a MediaElement. There are pretty much the same, but I don't want any XAML, so I use a MediaPlayer instead. Anyways, it plays some M4A files just fine. The NaturalDuration of other M4A files is 0, but it still plays. The remaining files don't play at all and the exception thrown is "Media file download failed." Playing all these songs using Windows Media Player works perfectly. Isn't the MediaPlayer and MediaElement classes built upon the same framework as WMP? I'm confused as to why it isn't working. Any help is greatly appreciated. Thanks, Nick

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• Is it possible to capture a window with windows 7 DWM thumbnail in it?

  - by Dogan Demir

  I am starting to believe that you can do nothing with Windows API. I have two windows. One has a DWM thumbnail in it. What I want to do is, I want to be able to capture the screen of the window with the thumbnail into the other one. When I do this, using bitblt, everything is copied except the thumbnail. It just isn't there in the bitmap. So how does the DWM rendering work? I mean, if DWM renders thumbnails directly onto the DC of the registered window, then my approach should work. I'm confused. Thanks a bunch.

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• Virtual functions and polymorphism

  - by ritmbo

  Suppose I have this: class A { public: virtual int hello(A a); }; class B : public A { public: int hello(B b){ bla bla }; }; So, A it's an abstract class. 1)In the class B, I'm defining a method that its suppose overrides the A class. But the parameter it's slightly different. I'm not sure about this, is this correct? Maybe because of polymorphism, this is ok but its rather confusing. 2) If I do: A a = new B;, and then a.hello(lol); if "lol" it's not of type B, then it would give compile error?, and if it's of type A from another class C (class C : public A), what would happend? I'm confused about the overriding and virtual thing.. all examples I found work with methods without parameters. Any answer, link, or whatever it's appreciated. thanks pd: sorry for my english

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• Spring-Security with X509?

  - by jschoen

  I am new to spring-security in general and am a bit confused. The project I am trying to integrate this with uses X509 certificates to identify users for signing in to the application. There are no usernames or passwords. We validate the certificates are good, and that they have been given access to our app. The question is how do I integrate spring in to this to get their roles using the X509 certificates? I have seen this: <http> ... <x509 subject-principal-regex="CN=(.*?)," user-service-ref="userService"/> ... </http> But I don't understand how this works. Will it still require something for a password? Or is the subject all it needs?

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• When is a webapp called Beta, alpha, pre-alpha, or none

  - by dmontain

  I've come across many apps on the web that call themselves Beta. I've come across other apps that had an alpha designation. I've even come across some that called themselves pre-alpha, whatever that means (if you know please clarify). Then I've come across some really bad webapps that shouldn't have left the developer's computer and they didn't have any beta designations. I've also seen some well built apps that called themselves Beta, including Stack Exchange (the mother site of SO) which I believe is very full featured to be called a Beta. I'm a little confused. It seems people are doing it at their whims. Is there an established rule or a checklist that can help decide what stage an app is in (beta, alpha, pre-alpha, or none)? P.S. Please feel free to retag as appropriate.

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• Rails ActionMailer problems on Mac

  - by seth

  I've been working on learning to use Rails the last couple days and I've run into something that I haven't been able to solve with Google. So I'm just creating a basic contact form that sends an email. Everything seems to be working ok in testing, which tells me that the form is working, and ActionMailer was implemented correctly, however, I'm having trouble configuring ActionMailer. I'm running OSX 10.6.2. I have postfix running and have verified that it's running using telnet localhost 25. When I try to use the form I get a "Connection refused" error. This is my current configuration: config.action_mailer.smtp_settings = { :address => 'localhost', :port => 25 } I thought I might need to set :domain but I'm kind of confused on what that should be set to in this situation.

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• Sharepoint listsService.updateList method clarification

  - by cyrix86

  I've seen an example here: msdn but it's a little confusing. So if I have a list definition with a field called "CustomField" and I want to update the "ShowField" attribute of this field to be true then I would do this: XmlNode listNode = listService.GetList("MyList"); string version = listNode.Attributes["Version"].Value; string guid = listNode.Attributes["Name"].Value; XmlDocument xmlDoc = new XmlDocument(); XmlElement updateFields = xmlDoc.CreateElement("Fields"); string fieldXml = @"<Method ID="1"><Field Name="CustomField" ShowField="true" /></Method>"; updateFields.InnerXml = fieldXml; XmlNode result = listService.UpdateList(guid, null, null, updateFields, null, version); I'm confused because it would seem that you would need to provide a field element to indicate what field to update and then a value element to specify the new value. Could someone clarify this please?

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• SQLite data-types

  - by Alan Harris-Reid

  Hi there, When creating a table in SQLite3, I get confused when confronted with all the possible datatypes which imply similar contents, so could anyone tell me the difference between the following data-types? INT, INTEGER, SMALLINT, TINYINT DEC, DECIMAL LONGCHAR, LONGVARCHAR DATETIME, SMALLDATETIME Is there some documentation somewhere which lists the min./max. capacities of the various data-types? For example, I guess smallint holds a larger maximum value than tinyint, but a smaller value than integer, but I have no idea of what these capacities are. Any help would be appreciated. Alan Harris-Reid

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• Supporting multiple screen sizes with Android using ImageButtons

  - by droidy

  I've read the Android documentation: http://developer.android.com/guide/practices/screens_support.html but still have some questions. I'm trying to design a music application which basically has images of the instrument (ImageButton) that play a sound when clicked. However, I'm confused about how to have the ImageButtons scale to fit all the different screen sizes and how to position them. Which layout is best used for needing to position ImageButtons in specific locations on the screen? (i.e. cymbals on a drum set) FrameLayout, RelativeLayout? If I only really care about medium and large screens, do I need to create different resources (images) for both as well as a different XML layout to position them? I'm trying to find the simplest way to do this without having to create a separate layout XML file for positioning/size and separate image resources for each screen. Any guidance is greatly appreciated. Thanks!

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• Joda time : DateTimeFormatter : beginning of a day

  - by bsreekanth

  Hello, DateTimeFormatter fmt = DateTimeFormat.forStyle('SS').withLocale(locale) DateTime dt = fmt.parseDateTime("11/4/03 8:14 PM"); the above statement will parse the string correctly, and save as DateTime (Joda Time). Now how to represent the beginning of a day. The below fails with DateTime dt = fmt.parseDateTime("11/4/03 00:01 AM"); Cannot parse "11/4/03 00:01 AM": Value 0 for clockhourOfHalfday must be in the range [1,12] I'm obviously confused with the standards, like what is the short representation of the beginning of a day. thanks.

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• Avoiding symbol capture when using macros to generate functions (or other macros)

  - by Rob Lachlan

  I'm a bit confused as to exactly when symbol capture will occur with clojure macros. Suppose that I have a macro which defines a function from keywords. In this trivial example, (defmacro foo [keywd1 keywd2] `(defn ~(symbol (name keywd1)) [~(symbol (name keywd2))] (* 2 ~(symbol (name keywd2))))) I call (foo :bar :baz), and this gets expanded into (defn bar [baz] (* 2 baz)). So now the question -- can this lead to symbol capture? If so, under what circumstances? I know that it's preferred to use gensym (e.g. bar#) to prevent symbol capture, but in some cases (not many, but still) I'd like to have a pretty macro-expansion, without the auto-generated symbols. Bonus question: does the answer change if we are considering a macro that creates macros?

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• How do uppercase and lowercase letters differ by only one bit?

  - by Vibhakar SInha

  I have found one example in Data and Communication Networking book written by Behrouza Forouzan regarding upper- and lowercase letters which differ by only one bit in the 7 bit code. For example, character A is 1000001 (0x41) and character a is 1100001 (0x61).The difference is in bit 6, which is 0 in uppercase letters and 1 in lowercase letters. If we know the code for one case, we can easily find the code for the other by adding or subtracting 32 in decimal, or we can just flip the sixth bit. What does all this mean? I have found myself very confused with all these things. Could someone provide examples of how these things really work out?

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• What is purpuse of T4 Generator in T4toolbox

  - by Fred Yang

  I am using T4toolbox, I am confused what the generator is for. I can run the following public class Generator1 : Generator { protected override void RunCore() { Template1 t = new Template1(); t.Output.File = "t3.txt"; t.Render(); } } or I can run t4 script directly like the following. Template1 t = new Template1(); t.Output.File = "t3.txt"; t.Render(); But I can do the same using t4 script without generator as well. So I mean can do the same thing with two approach "script -- generator -- template" and "script -- template", am I missing something? Thanks

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• C++0x and the Lack of Polymorphic Lambdas - Why?

  - by Dominar

  I've been reviewing the draft version of the upcoming C++0x standard. Specifically the section on lambdas, and am confused as to the reasoning for not introducing polymorphic lambdas. I had hoped we could use code such as the following: template<typename Container> void foo(Container c) { for_each(c.begin(),c.end(),[](T& t) { ++t; }); } What were the reasons: Was it the committee ran out of time? That polymorphic lambdas are too hard to implement? Or perhaps that they are seen as not being needed by the PTB?

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• iPhone Core Data: request for member 'tableView' in something not a structure or union

  - by Nic Hubbard

  I am trying to use CoreData to populate a UITableView. I have been using the developer "Locations" project, and I think I have everything correct. But, now I am getting the following error when I build: request for member 'tableView' in something not a structure or union Why would it be confused about tableView? I am using it many times in the methods. The errors seem to be coming from: [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES]; Ideas?

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• Use of double pointer in linux kernel Hash list implementation

  - by bala1486

  Hi, I am trying to understand Linux Kernel implementation of linked list and hash table. A link to the implementation is here. I understood the linked list implementation. But i am little confused of why double pointers is being used in hlist (**pprev). Link for hlist is here. I understand that hlist is used in implementation of hash table since head of the list requires only one pointer and it saves space. Why cant it be done using single pointer (just *prev like the linked list)? Please help me.

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• Collection.contains(Enum.Value) in HQL?

  - by Seth

  I'm a little confused about how to do something in HQL. So let's say I have a class Foo that I'm persisting in hibernate. It contains a set of enum values, like so: public class Foo { @CollectionOfElements private Set<Bar> barSet = new HashSet<Bar>(); //getters and setters here ... } and public enum Bar { A, B } Is there an HQL statement I can use to fetch only Foo instances who'se barSet containst Bar.B? List foos = session.createQuery("from Foo as foo " + "where foo.barSet.contains.Bar.B").list(); Or am I stuck fetching all Foo instances and filtering them out at the DAO level? List foos = session.createQuery("from Foo as foo").list(); List results = new ArrayList(); for(Foo f : foos) { if(f.barSet.contains(Bar.B)) results.add(f); } Thanks!

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• Using Qt to read and parse html files with QWebKit?

  - by Alberto Toglia

  I would like to read and parse certain elements of html files but I'm not interested in rendering it in any way. Basically I would like to go through all my div tags and get some of its style attributes. This is what I've done so far: QWebPage page; QWebFrame * frame = page.mainFrame(); QUrl fileUrl("localFile.html"); frame->setUrl(fileUrl); QWebElement document = frame->documentElement(); QWebElementCollection elements = document.findAll("div"); foreach (QWebElement element, elements){ std::cout << element.attribute("style").toStdString() << std::endl; } Doesn't show anything. I'm somewhat confused if I could use webkits this way. P.D.: I'm using a filechooser to pick the local html root.

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• Using LINQ Group By to return new XElements

  - by Jon

  I have the following code and got myself confused: I have a query that returns a set of records that have been identified as duplicates and I then want to create a XElement for each one. This should be done in one query I think but I'm now lost. var f = (from x in MyDocument.Descendants("RECORD") where itemsThatWasDuplicated.Contains((int)x.Element("DOCUMENTID")) group x by x.Element("DOCUMENTID").Value into g let item = g.Skip(1) //Ignore first as that is the valid one select item ); var errorQuery = (from x in f let sequenceNumber = x.Element("DOCUMENTID").Value let detail = "Sequence number " + sequenceNumber + " was read more than once" select new XElement("ERROR", new XElement("DATETIME", time), new XElement("DETAIL", detail), new XAttribute("TYPE", "DUP"), new XElement("ID", x.Element("ID").Value) ) );

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• problem creating object "wscript.shell"

  - by sushant

  my script looks like: Dim WshShell, oExec Set WshShell = CreateObject("WScript.Shell") Set oExec = WshShell.Exec("cmd /c cd D:\d & D: & winzip32.exe -min -a D:\a") Do While oExec.Status = 0 WScript.Sleep 100 Loop WScript.Echo oExec.Status The idea was to use explorer to open these files. The problem I'm having though is on the line: Set WshShell = CreateObject("WScript.Shell") I keep getting the message ActiveX component can't create object: 'WScript.Shell' I'm totally confused because this exact same code runs fine if I write it in a .htm file. Why does my browser treat my .asp page differently than the .html file? How do i fix this problem?

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