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• What makes Groovy+Grails a more productive setup than J2EE?

  - by Pradyumna

  I'm coming across references to 'Grails' and 'Groovy' quite often these days.. mostly on how great a productivity booster it is as opposed to standard J2EE, or things like JSF, Struts etc.. And there's also an impressive set of case studies in support of this on their web site too. So I just thought I would explore some of it.. As I start off on this, I was curious if there was any material (link, blog, article, paper..) that explains what are the special features in Grails+Groovy (and not found elsewhere, in the J2EE world) that makes it a more productive environment to work in? Thanks!

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• Faster way of initializing arrays in Delphi

  - by Max

  I'm trying to squeeze every bit of performance in my Delphi application and now I came to a procedure which works with dynamic arrays. The slowest line in it is SetLength(Result, Len); which is used to initialize the dynamic array. When I look at the code for the SetLength procedure I see that it is far from optimal. The call sequence is as follows: _DynArraySetLength - DynArraySetLength DynArraySetLength gets the array length (which is zero for initialization) and then uses ReallocMem which is also unnecessary for initilization. I was doing SetLength to initialize dynamic array all the time. Maybe I'm missing something? Is there a faster way to do this?

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• Making an element draggable?

  - by user246114

  Hi, I'm trying to make an element draggable, like so: var element = $("<li id='test'>Hello</li>"); element.appendTo("#panelParent"); element.draggable("enable"); element.draggable("option", "connectToSortable", '#panelTarget'); element.draggable("option", "helper", 'clone'); element.draggable("option", "revert", 'invalid'); nothing happens when I try dragging this element. It works fine though if I embed the object in the page beforehand instead of trying to dynamically create the element. Any idea what I'm missing? For example, this works: $(function() { $("#test").draggable({ connectToSortable: '#panelTarget', helper: 'clone', revert: 'invalid' }); }); <ul> <li id='test'>Hello</li> </ul> Thanks

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• PHP $_REQUEST doesn't contain all $_GET varaibles

  - by pinky0x51

  Until today I thought that $_REQUEST always contains all variables form $_POST and $_GET. But today I had the strange experience that one variable is part of $_GET but not part of $_REQUEST. I played a little bit around with the URL which hands over the parameters and it seems like always the fist parameter is missing in the $_REQUEST array. Do you have any idea why this could happen? Thanks! URL: localhost/?app=files&getfile=ajax/newfile.php?dir=%2Ftest4&source=http%3A%2F%2Fl??ocalhost%2Fimg%2Flogo.svg&filename=logo.svg&requesttoken=e250827c341650990cd4

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• access a property via string with array in php?

  - by sprugman

  (This is in drupal, but I don't really think that matters.) I have a big list of properties that I need to map between two objects, and in one, the value that I need to map is buried inside an array. I'm hoping to avoid hard-coding the property names in the code. If I have a class like this: class Product { public $colors, $sizes; } I can access the properties like this: $props = array('colors', 'sizes'); foreach ($props as $p) { $this->$p = $other_object->$p; } As far as I can tell, if each of the properties on the left are an array, I can't do this: foreach ($props as $p) { $this->$p[0]['value'] = $other_object->$p; } Is that correct, or am I missing some clever way around this?

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• Can we execute methods / code in XCode just like in Visual Studio?

  - by balexandre

  Visual Studio is one of the best developer IDE of all times, and now was improved with multithreading debugging and much more. My question is regarding XCode and the ability to execute code just like we do in Visual Studio. Let's assume an object in a view and I want to run, let's say: [pickerView setHidden:YES]; in a breakpoint just to see if in that break point I could actually hide the object. I can't find any place for this in the XCode Debugger Am I missing something or I can't execute code that is not in the files already? like in Visual Studio Watch List or Immediate Window

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• How much Java should I have learnt before trying Android programming?

  - by Sidney Yin

  Hi - I have been seeking beginner learning books in Android, and of course found out that I should learn Java first. So I began studying Java and now I am quite comfortable with objects, classes, inheritance, interfaces, and just moved onto Layouts in Swing as well as Swing Features. But I am starting to wonder.... do I know enough about Java now? Can I start programming Android yet? Of course I can keep going in Java, but have been itching to begin programming Android apps. Any definitive answer here about how much Java I need to know before Android? Thanks so much!

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• C++ Inheritance Question

  - by shaz

  I have a base class MessageHandler and 2 derived classes, MessageHandler_CB and MessageHandler_DQ. The derived classes redefine the handleMessage(...) method. MH_DQ processes a message and puts the result in a deque while MH_CB processes the message and then executes a callback function. The base class has a static callback function that I pass along with a this pointer to a library which calls the static callback when a new message is available for processing. My problem comes when I am in the static callback with a void * pointing to either a MH_DQ or a MH_CB. If I cast it to the base class the empty MessageHandler::handleMessage(...) method is called, rather than the version in the appropriate derived class. What is the best way to address this situation from a design perspective and/or what language features might help me to implement a solution to my problem? Thanks in advance!

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• If item not in the lst in scheme

  - by ms. sakura

  I'm working on context-free grammars, and I have a function that returns the (terminal values of grammar) for example: i have non-terminal function that results in (A B) , from calling say ((A cat) (B happy np) (A B sad)) so technically A and B are non terminals of the grammar. Now I want to be able to get the terminals (cat happy np sad) (define terminals (lambda (lsts) (cond ((null? lsts) lsts) ((not(member? (car(car lsts)) (n-terminals lsts))) (cons (car(car lsts)) (terminals (car (cdr lsts))))) (else (terminals (cdr lsts)))))) PS: functionality of n-terminals is described above. member? is a boolean function that returns true if an item is a member of the list, false otherwise. My function returns an empty lst. What am I missing here?

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• Select distinct ... inner join vs. select ... where id in (...)

  - by Tonio

  I'm trying to create a subset of a table (as a materialized view), defined as those records which have a matching record in another materialized view. For example, let's say I have a Users table with user_id and name columns, and a Log table, with entry_id, user_id, activity, and timestamp columns. First I create a materialized view of the Log table, selecting only those rows with timestamp some_date. Now I want a materliazed view of the Users referenced in my snapshot of the Log table. I can either create it as select * from Users where user_id in (select user_id from Log_mview), or I can do select distinct u.* from Users u inner join Log_mview l on u.user_id = l.user_id (need the distinct to avoid multiple hits from users with multiple log entries). The former seems cleaner and more elegant, but takes much longer. Am I missing something? Is there a better way to do this?

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• Can Android Applications ( using libraries build from NDK ) be used on both x86 & ARM platform?

  - by Vibgyor

  I am going to build an Android application in which I want to use a C library. So, I am planning to use NDK along with the SDK. NDK supports ARMv5, ARmv7 and x86 instruction set. Now, if I build an Android application using ARMv5 , will it run on Android phones based on Intel ( x86 ) platform (am I missing something ?)? If not, then what is the way by which I can build an ANdroid application ( which uses some C libraries underneath ) that can run on all the Android phones irrespective of the underneath platform? Vibgyor

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• Changing XML Namespace with Scala

  - by toddk

  I am using scala to load a XML file from file via the scala.xml.XML.loadFile() method. The documents I'm working with have namespaces already defined and I wish to change the namespace to something else using scala. For example, a document has a xmlns of "http://foo.com/a" with a prefix of "a" - I would like to change the namespace and prefix for the document to "http://foo.com/b" and "b" respectively. Seems easy and I feel like I'm missing something obvious here. I do not have a problem getting the namespace from the return Elem from the referenced loadFile() method.

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• Empty database output in CI

  - by den-javamaniac

  Hi. I'm building a simple app and trying to test DB result output. But unfortunately all I'm getting is an array of size 0. Here's the controller code excerpt: $data['query'] = $this->db->query('SELECT role_id, role_privilege FROM role'); $this->load->view('welcome_message', $data); And a view code excerpt: <?php echo count($query->result_array())."<br/>"; foreach ($query->result() as $row){ echo $row->role_id . '<br/>'; echo $row->role_privilege . '<br/>'; } echo 'Total result '.$query->num_rows(); ?> And what I get is next: 0 Total result Running query from a command line gives a 2 rowed output. Can someone point out what i'm missing?

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• My tricky SQL Update query not working so well.

  - by Spooks

  I am trying to update a table in my database with another row from another table. I have two parameters one being the ID and another being the row number (as you can select which row you want from the GUI) this part of the code works fine, this returns one column of a single row. (select txtPageContent FROM (select *, Row_Number() OVER (ORDER BY ArchiveDate asc) as rowid from ARC_Content Where ContentID = @ContentID) as test Where rowid = @rowID) its just when i try to add the update/set it won't work. I am probably missing something update TBL_Content Set TBL_Content.txtPageContent = (select txtPageContent FROM (select *, Row_Number() OVER (ORDER BY ArchiveDate asc) as rowid from ARC_Content Where ContentID = @ContentID) as test Where rowid = @rowID) Thanks for the help! (i have tried top 1 with no avail)

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• What Android version to target?

  - by Richard Eng

  I'm about to write my first Android app. It's a fairly basic app that doesn't use any special features beyond being able to schedule notifications and read/write image files to the device's local storage. Reaching the broadest audience is my top priority. If I target Android 1.5, is the app guaranteed to run fine all the way up to ICS? Should I target Android 2.1, which seems to be the new baseline for common phones in use? Since the app is fairly basic, if I target ICS, would it run on versions going all the way back to 2.1? Maybe this is a stupid question.

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• Use of 'standalone parentheses'

  - by zaf

  I just answered a question where I advised removing parentheses around a statement and was asked why, to which I had no answer when I realised that it caused no errors/warnings. I could only cite bad practice. But maybe I'm the one missing something... I did my own tests: (print('!')); // Outputs '!' ((print('!!'))); // Outputs '!!' (1); // No output (qwerty); // No output (1==2); // No output (1=2); // Syntax error // etc... Can someone shed some light on whats going on and of what use are 'standalone parentheses'?

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• iPhone real memory climbs when interacting with UI

  - by Scott Gress

  I've been using the Activity Monitor to check the memory usage of my iPhone apps. I've noticed that the Real Memory climbs whenever I interact with the UI in any way, even if there's no code being called. For example, I can create a brand new View-Based application and run it, and as I click or drag in the empty window the Real Memory increases even though the app isn't responding in any way. I get that the view controller is doing some stuff in the background to interpret my interactions, but it seems like the memory should go back down after a second or so. Instead, it keeps going up and up and up as long as I keep clicking or dragging. I can wait forever and it never decreases. This is a little disturbing. Am I missing something?

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• Eclipse debug - line: not available

  - by Mike

  I can't seem to find anything on google telling me why this might be and what the resolution is. I'm Stepping through third party code (that I have the source for) and would really like to see the current line being executed... Looking at javac compile flags, I see the -g:none flag. If this flag is set, would this be enough to explain why I'm not able to see line numbers? If so, why would someone do this, are there performance implications? Do I need to recompile the jar myself to attach the missing debug info (if possible)? Thanks!

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• Dynamic themes and custom styles

  - by Lawrence Kesteloot

  I've got an app with two themes (dark and light) that can be selected at runtime. This works. I also have a ListView with rows that can have one of three different layouts, each of which has a style (say, different colors). This also works. But I can't get these two features to work together. I really need six different styles, three for one theme (dark) and three for the other (light), but I can't figure out how to choose a style for a list item based on the current theme, or get that effect any other way by using XML files. My three layouts each point to a custom theme that sets the color, but that overrides whatever theme I've got set. Themes can only contain items that are "styleable", so I can't put my own custom items in there. There may be a way to do this programmatically, but I was hoping to do it declaratively. Any ideas?

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• Problem with SDL 1.2 when setting videomode with SDL_SetVideoMode

  - by user574911

  I have a very simple program, in which I am initialising with SDL_Init(flags) and using SDL_SetVideoMode but It fails by returning null. I think I am missing some config parameters/options, if any one knows about this erro please let me know. My code is as below : if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) { fprintf(stderr, "Could not initialize SDL\n"); exit(1); } screen = SDL_SetVideoMode(640, 480, 0, 0); if(!screen) { fprintf(stderr, "SDL: could not set video mode - exiting\n"); exit(1); }

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• db2 stored procedure. locking / releasing table

  I use a stored procedure to read/update/return certain fields in a journaled as400 table. I want to lock the table first and then release it after the record is updated. I tried tons of stuff, but releasing table is a problem. SP defines and opens cursor, selects record into variables and updates the record. I tried 'begin atomic', then lock table in exclusive mode and then when it's over, it doesn't release. Is there any statement i missing or do i need to compile it with certain parameters? I use a simple create procedure statement in AS400 navigator's sql panel to compile it. Will very appreciate some help with example. Thanks.

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• Is it possible (and if so how) to delete a zookeeper node with apache camel?

  - by b_habegger

  I am looking into using Zookeeper to synchronized distributed Camel instances. In doing so it seems that there is not possibility to delete a znode from Zookeeper from Camel (I imagined some sort of producer operation). A look at the components source seems to confirm this. (I didn't find any code explicitely requesting a node removal). Am I missing something ? When would a node created via Camel (in my case EPHEMERAL) be deleted ? Maybe I am miss understanding something with zookeeper ?

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• Drupal vs Some Other CMS

  - by Vecta

  I'm going to be moving my website to a CMS in the coming months I'd I need some help on choosing an appropriate CMS. Many of the websites I've seen tend to say "use Drupal, hands down". However, my website truly doesn't have a need for commenting or community features. Its pages will need to be modified occasionally, but not extensively. My website will also consist of many programs, each with their own sub-pages and menus. There are probably 25 people that will need access to the content on my website and will need the ability to update it. I do like the idea of being able to tag and categorize the content, and the modular aspect of Drupal but is it really right for my website? If not, which CMS may fit my needs better?

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• Query does not subtract correctly

  - by Chris

  I have these two tables: SQL> SELECT * FROM TAB_A; MYDATE P4 D1 D2 P5 P6 --------- ---------- ---------- ----------- ----------- ----------- 30-OCT-12 949,324 4,437,654 10,203,116 25,303,632 13,900,078 SQL> SELECT * FROM TAB_B; MYDATE P4 D1 D2 P5 P6 --------- ---------- ---------- ----------- ----------- ----------- 30-OCT-12 937,796 4,388,477 10,091,811 25,028,402 13,755,882 I need to subtract their respective columns and store the results into a third table like so: SQL> INSERT INTO TAB_C (MYDATE, P4) SELECT SYSDATE,A.P4-B.P4 FROM TAB_A A,TAB_B B WHERE A.MYDATE=B.MYDATE; SQL> SELECT * FROM TAB_C; MYDATE P4 D1 D2 P5 P6 --------- ---------- ---------- ----------- ----------- ----------- 30-OCT-12 926,268 The result is wrong. Basic math: 949324-937796=11528. Numeric values are stored as number datatypes. What am I missing here?

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• How does Array.ForEach() compare to standard for loop in C#?

  - by DaveN59

  I pine for the days when, as a C programmer, I could type: memset( byte_array, '0xFF' ); and get a byte array filled with 'FF' characters. So, I have been looking for a replacement for this: for (int i=0; i < byteArray.Length; i++) { byteArray[i] = 0xFF; } Lately, I have been using some of the new C# features and have been using this approach instead: Array.ForEach<byte>(byteArray, b => b = 0xFF); Granted, the second approach seems cleaner and is easier on the eye, but how does the performance compare to using the first approach? Am I introducing needless overhead by using Linq and generics? Thanks, Dave

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