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• Why not .NET-style delegates rather than closures in Java?

  - by h2g2java

  OK, this is going to be my beating a dying horse for the 3rd time. However, this question is different from my earlier two about closures/delegates, which asks about plans for delegates and what are the projected specs and implementation for closures. This question is about - why is the Java community struggling to define 3 different types of closures when we could simply steal the whole concept of delegates lock, stock and barrel from our beloved and friendly neighbour - Microsoft. There are two non-technical conclusions I would be very tempted to jump into: The Java community should hold up its pride, at the cost of needing to go thro convoluted efforts, by not succumbing to borrowing any Microsoft concepts or otherwise vindicate Microsoft's brilliance. Delegates is a Microsoft patented technology. Alright, besides the above two possibilities, Q1. Is there any weakness or inadequacy in msft-styled delegates that the three (or more) forms of closures would be addressing? Q2. I am asking this while shifting between java and c# and it intrigues me that c# delegates does exactly what I needed. Are there features that would be implemented in closures that are not currently available in C# delegates? If so what are they because I cannot see what I need more than what C# delegates has adequately provided me? Q3. I know that one of the concerns about implementing closures/delegates in java is the reduction of orthogonality of the language, where more than one way is exposed to perform a particular task. Is it worth the level convolution and time spent to avoid delegates just to ensure java retains its level of orthogonality? In SQL, we know that it is advisable to break orthogonality by frequently adequately satisfying only the 2nd normal form. Why can't java be subjected to reduction of orthogonality and OO-ness for the sake of simplicity? Q4. The architecture of JVM is technically constrained from implementing .NET-styled delegates. If this reason WERE (subjunctive to emphasize unlikelihood) true, then why can't the three closures proposals be hidden behind a simple delegate keyword or annotation: if we don't like to use @delegate, we could use @method. I cannot see how delegate statement format is more complex than the three closure proposals.

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• The Skyline Problem.

  - by zeroDivisible

  I just came across this little problem on UVA's Online Judge and thought, that it may be a good candidate for a little code-golf. The problem: You are to design a program to assist an architect in drawing the skyline of a city given the locations of the buildings in the city. To make the problem tractable, all buildings are rectangular in shape and they share a common bottom (the city they are built in is very flat). The city is also viewed as two-dimensional. A building is specified by an ordered triple (Li, Hi, Ri) where Li and Ri are left and right coordinates, respectively, of building i and Hi is the height of the building. In the diagram below buildings are shown on the left with triples (1,11,5), (2,6,7), (3,13,9), (12,7,16), (14,3,25), (19,18,22), (23,13,29), (24,4,28) and the skyline, shown on the right, is represented by the sequence: 1, 11, 3, 13, 9, 0, 12, 7, 16, 3, 19, 18, 22, 3, 23, 13, 29, 0 The output should consist of the vector that describes the skyline as shown in the example above. In the skyline vector (v1, v2, v3, ... vn) , the vi such that i is an even number represent a horizontal line (height). The vi such that i is an odd number represent a vertical line (x-coordinate). The skyline vector should represent the "path" taken, for example, by a bug starting at the minimum x-coordinate and traveling horizontally and vertically over all the lines that define the skyline. Thus the last entry in the skyline vector will be a 0. The coordinates must be separated by a blank space. If I will not count declaration of provided (test) buildings and including all spaces and tab characters, my solution, in Python, is 223 characters long. Here is the condensed version: B=[[1,11,5],[2,6,7],[3,13,9],[12,7,16],[14,3,25],[19,18,22],[23,13,29],[24,4,28]] # Solution. R=range v=[0 for e in R(max([y[2] for y in B])+1)] for b in B: for x in R(b[0], b[2]): if b[1]>v[x]: v[x]=b[1] p=1 k=0 for x in R(len(v)): V=v[x] if p and V==0: continue elif V!=k: p=0 print "%s %s" % (str(x), str(V)), k=V I think that I didn't made any mistake but if so - feel free to criticize me. EDIT I don't have much reputation, so I will pay only 100 for a bounty - I am curious, if anyone could try to solve this in less than .. lets say, 80 characters. Solution posted by cobbal is 101 characters long and currently it is the best one. ANOTHER EDIT I thought, that 80 characters is a sick limit for this kind of problem. cobbal, with his 46 character solution totaly amazed me - though I must admit, that I spent some time reading his explanation before I partially understood what he had written.

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• Set default form textfield value (webbrowser control/DOM Javscript)

  - by Khou

  Hi I would like my application to load a webpage and set default the form textfield value a predefine value. Requirements: -The application is a windows form, it is to use the web browser control, to load a web page. -Textfield values are define by within the application. -When textfield on the webpage matches the applications predefined elements, the predefine fixed value is set and can not be changed by the end user. Example If my application defines element "FirstName" equal to value "John", the text field for value for element "FirstName" will always equal "John" and this value can not be changed by the end user. Below is html/javascript code to perform this functionality, now how do I implement this in a windows form? (without having to modify the loaded webpage source code (if possible). HTML <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>page title</title> <script script type="text/javascript" src="demo1.js"></script> </head> <body onload="def(document.someform, 'name', 'my default name value');"> <h2 style="color: #8e9182">test form title</h2> <form name="someform" id="someform_frm" action="#"> <table cellspacing="1"> <tr><td><label for="name">NameX: </label></td><td><input type="text" size="30" maxlength="155" name="name" onchange="def(document.someform, 'name', 'my default name value');"></td></tr> <tr><td><label for="name2">NameY: </label></td><td><input type="text" size="30" maxlength="155" name="name2"></td></tr> <tr><td colspan="2"><input type="button" name="submit" value="Submit" onclick="showFormData(this.form);" ></td></table> </form> </body> </html> JAVASCRIPT function def(oForm, element_name, def_txt) { oForm.elements[element_name].value = def_txt; }

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• log4net: what am I doing wrong?

  - by Berryl

  Being a log4net newb / boob I just copied lines from an NHibernate example project where I can see the log.txt file is updated. Is there a quick answer why mine isn't creating the file? Cheers, Berryl [assembly: log4net.Config.XmlConfigurator(Watch = true)] I saw another post here saying this should go in AssemblyInfo, but in the example project this is just another line in a static helper class. Not wanting to 'mess with' assemblyInfo I also put this in a static helper, along with the following to actually log in the same static helper class: private static readonly log4net.ILog _log = log4net.LogManager.GetLogger( System.Reflection.MethodBase.GetCurrentMethod().DeclaringType ); And in app.config, I have <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> </configSections> <!-- This section contains the log4net configuration settings --> <log4net> <!-- Define an output appender (where the logs can go) --> <appender name="LogFileAppender" type="log4net.Appender.FileAppender, log4net"> <param name="File" value="log.txt" /> <param name="AppendToFile" value="false" /> <layout type="log4net.Layout.PatternLayout, log4net"> <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] &lt;%X{auth}&gt; - %m%n" /> </layout> </appender> <appender name="LogDebugAppender" type="log4net.Appender.DebugAppender, log4net"> <layout type="log4net.Layout.PatternLayout, log4net"> <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] &lt;%X{auth}&gt; - %m%n"/> </layout> </appender> <!-- Setup the root category, set the default priority level and add the appender(s) (where the logs will go) --> <root> <priority value="ALL" /> <appender-ref ref="LogFileAppender" /> <appender-ref ref="LogDebugAppender"/> </root> <!-- Specify the level for some specific namespaces --> <!-- Level can be : ALL, DEBUG, INFO, WARN, ERROR, FATAL, OFF --> <logger name="NHibernate"> <level value="ALL" /> </logger> </log4net>

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• Another design-related C++ question

  - by Kotti

  Hi! I am trying to find some optimal solutions in C++ coding patterns, and this is one of my game engine - related questions. Take a look at the game object declaration (I removed almost everything, that has no connection with the question). // Abstract representation of a game object class Object : public Entity, IRenderable, ISerializable { // Object parameters // Other not really important stuff public: // @note Rendering template will never change while // the object 'lives' Object(RenderTemplate& render_template, /* params */) : /*...*/ { } private: // Object rendering template RenderTemplate render_template; public: /** * Default object render method * Draws rendering template data at (X, Y) with (Width, Height) dimensions * * @note If no appropriate rendering method overload is specified * for any derived class, this method is called * * @param Backend & b * @return void * @see */ virtual void Render(Backend& backend) const { // Render sprite from object's // rendering template structure backend.RenderFromTemplate( render_template, x, y, width, height ); } }; Here is also the IRenderable interface declaration: // Objects that can be rendered interface IRenderable { /** * Abstract method to render current object * * @param Backend & b * @return void * @see */ virtual void Render(Backend& b) const = 0; } and a sample of a real object that is derived from Object (with severe simplifications :) // Ball object class Ball : public Object { // Ball params public: virtual void Render(Backend& b) const { b.RenderEllipse(/*params*/); } }; What I wanted to get is the ability to have some sort of standard function, that would draw sprite for an object (this is Object::Render) if there is no appropriate overload. So, one can have objects without Render(...) method, and if you try to render them, this default sprite-rendering stuff is invoked. And, one can have specialized objects, that define their own way of being rendered. I think, this way of doing things is quite good, but what I can't figure out - is there any way to split the objects' "normal" methods (like Resize(...) or Rotate(...)) implementation from their rendering implementation? Because if everything is done the way described earlier, a common .cpp file, that implements any type of object would generally mix the Resize(...), etc methods implementation and this virtual Render(...) method and this seems to be a mess. I actually want to have rendering procedures for the objects in one place and their "logic implementation" - in another. Is there a way this can be done (maybe alternative pattern or trick or hint) or this is where all this polymorphic and virtual stuff sucks in terms of code placement?

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• Using sem_t in a Qt Project

  - by thauburger

  Hi everyone, I'm working on a simulation in Qt (C++), and would like to make use of a Semaphore wrapper class I made for the sem_t type. Although I am including semaphore.h in my wrapper class, running qmake provides the following error: 'sem_t does not name a type' I believe this is a library/linking error, since I can compile the class without problems from the command line. I've read that you can specify external libraries to include during compilation. However, I'm a) not sure how to do this in the project file, and b) not sure which library to include in order to access semaphore.h. Any help would be greatly appreciated. Thanks, Tom Here's the wrapper class for reference: Semaphore.h #ifndef SEMAPHORE_H #define SEMAPHORE_H #include <semaphore.h> class Semaphore { public: Semaphore(int initialValue = 1); int getValue(); void wait(); void post(); private: sem_t mSemaphore; }; #endif Semaphore.cpp #include "Semaphore.h" Semaphore::Semaphore(int initialValue) { sem_init(&mSemaphore, 0, initialValue); } int Semaphore::getValue() { int value; sem_getvalue(&mSemaphore, &value); return value; } void Semaphore::wait() { sem_wait(&mSemaphore); } void Semaphore::post() { sem_post(&mSemaphore); } And, the QT Project File: TARGET = RestaurantSimulation TEMPLATE = app QT += SOURCES += main.cpp \ RestaurantGUI.cpp \ RestaurantSetup.cpp \ WidgetManager.cpp \ RestaurantView.cpp \ Table.cpp \ GUIFood.cpp \ GUIItem.cpp \ GUICustomer.cpp \ GUIWaiter.cpp \ Semaphore.cpp HEADERS += RestaurantGUI.h \ RestaurantSetup.h \ WidgetManager.h \ RestaurantView.h \ Table.h \ GUIFood.h \ GUIItem.h \ GUICustomer.h \ GUIWaiter.h \ Semaphore.h FORMS += RestaurantSetup.ui LIBS += Full Compiler Output: g++ -c -pipe -g -gdwarf-2 -arch i386 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED - I/usr/local/Qt4.6/mkspecs/macx-g++ -I. - I/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/usr/include/QtCore - I/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/usr/include/QtGui - I/usr/include -I. -I. -F/Library/Frameworks -o main.o main.cpp In file included from RestaurantGUI.h:10, from main.cpp:2: Semaphore.h:14: error: 'sem_t' does not name a type make: *** [main.o] Error 1 make: Leaving directory `/Users/thauburger/Desktop/RestaurantSimulation' Exited with code 2. Error while building project RestaurantSimulation When executing build step 'Make'

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• Proxy settings with ivy...

  - by user315228

  Hi, I have an issue where in I have defined dependancies in ivy.xml on our internal corporate svn. I am able to access this svn site without any proxy task in ant. While my dependencies resides on ibiblio, that’s something outside our corporate, and needs proxy inorder to download something. I am facing problem using ivy here: I have following in build.xml <target name="proxy" <property name="proxy.host" value="xyz.proxy.net"/ <property name="proxy.port" value="8443"/ <setproxy proxyhost="${proxy.host}" proxyport="${proxy.port}"/ </target <!-- resolve the dependencies of stratus --> <target name="resolveTestDependency" depends="testResolve, proxy" description="retrieve test dependencies with ivy"> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:retrieve conf="test" pattern="${jars}/[artifact]-[revision].[ext]"/><!--pattern here specifies where do you want to download lib to?--> </target> <target name=" testResolve "> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:resolve conf="test" file="stratus-ivy.xml"/> </target> Following is the excerpt from stratus-ivysettings.xml <resolvers <!-- here you define your file in private machine not on the repo (e.g. jPricer.jar or edgApi.jar)-- <!-- This we will use a url nd not local file system.. -- <url name="privateFS" <ivy pattern="http://xyz.svn.com/ivyRepository/ [organisation]/ivy/ivy.xml"/ </url . . . <url name="public" m2compatible="true" <artifact pattern="http://www.ibiblio.org/maven2/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/ </url . . . So as can be seen here for getting ivy.xml, I don’t need any proxy as its within our own network which cant be accesses when I set proxy. But on the other hand I am using ibiblio as well which is external to our network and works only with proxy. So above build.xml wont work in that case. Can somebody help here. I don’t need proxy while getting ivy.xml (as if I have proxy, ivy wont be able to find ivy file behind proxy from within the network), and I just need it when my resolver goes to public url.

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• Proxy settings with ivy...

  - by user315228

  Hi, I have an issue where in I have defined dependancies in ivy.xml on our internal corporate svn. I am able to access this svn site without any proxy task in ant. While my dependencies resides on ibiblio, that’s something outside our corporate, and needs proxy inorder to download something. I am facing problem using ivy here: I have following in build.xml <target name="proxy"> <property name="proxy.host" value="xyz.proxy.net"/> <property name="proxy.port" value="8443"/> <setproxy proxyhost="${proxy.host}" proxyport="${proxy.port}"/> </target> &lt;!-- resolve the dependencies of stratus --&gt; &lt;target name="resolveTestDependency" depends="testResolve, proxy" description="retrieve test dependencies with ivy"&gt; &lt;ivy:settings file="stratus-ivysettings.xml" /> &lt;ivy:retrieve conf="test" pattern="${jars}/[artifact]-[revision].[ext]"/&gt;<!--pattern here specifies where do you want to download lib to?--> </target> <target name=" testResolve "> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:resolve conf="test" file="stratus-ivy.xml"/> </target> Following is the excerpt from stratus-ivysettings.xml <resolvers <!-- here you define your file in private machine not on the repo (e.g. jPricer.jar or edgApi.jar)-- <url name="privateFS" <ivy pattern="http://xyz.svn.com/ivyRepository/[organisation]/ivy/ivy.xml"/ </url . . . <url name="public" m2compatible="true" <artifact pattern="http://www.ibiblio.org/maven2/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/ </url . . . So as can be seen here for getting ivy.xml, I don’t need any proxy as its within our own network which cant be accesses when I set proxy. But on the other hand I am using ibiblio as well which is external to our network and works only with proxy. So above build.xml wont work in that case. Can somebody help here. I don’t need proxy while getting ivy.xml (as if I have proxy, ivy wont be able to find ivy file behind proxy from within the network), and I just need it when my resolver goes to public url.

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• UL alignment to bottom

  - by air

  dear i have define on ul <ul id="album"> <li id="list1"> <a href="#"> <img src="google.jpg" height="50"/> </a> <a href="#" class="user-title">Profile Pictures</a> 1 Picture </li> <li id="list1"> <a href="#"> <img src="yahoo.jpg" height="150"/> </a> <a href="#" class="user-title">Profile Pictures</a> 2 Picture </li> </ul> css for is as bellow. #album{ height:195px; width:155px; overflow:hidden; padding:6px 10px 14px 10px; float:left; } #album li{ border:0; padding:0; list-style:none; margin: 0 0.15em; list-style:none; display: inline; } #album img{ vertical-align:bottom; } #album a{ color:#000000; text-decoration:none; } #album .user-title{ display:block; font-weight:bold; margin-bottom:4px; font-size:11px; color:#36538D; } #album .addas{ display:block; font-size:11px; color:#666666; } #album img{ margin-right:14px; padding:4px; } this is working fine. but i need to align images to bottom on display. here is image

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• JNI loses reference to native methods

  - by lhw

  As an example for later use in Android I wrote a simple callback interface. While doing so i ran into the following error or bug or whatever. In C the two commented lines are supposed to be executed resulting in calling the C callback onChange. But instead i get an UnsatisfiedLinkError. Calling the native Method directly in Java works just fine. Calling it directly from C as presented here in the example also produces the UnsatisfiedLinkError. I'm open for any advice concerning this issue or work arounds and so on. The Java Part: import java.util.LinkedList; import java.util.Random; interface Listener { public void onChange(float f); } class Provider { LinkedList<Listener> all; public Provider() { all = new LinkedList<Listener>(); } public void registerChange(Listener lst) { all.add(lst); } public void sendMsg() { Random rnd = new Random(); for(Listener l : all) { try { l.onChange(rnd.nextFloat()); } catch(Exception e) { System.out.println(e); } } } } class Inheritance implements Listener { static public void main(String[] args) { System.load(System.getProperty("user.dir") + "/libinheritance.so"); } public native void onChange(float f); } The C Part: #include "inheritance.h" jint JNI_OnLoad(JavaVM *jvm, void *reserved) { JNIEnv *env; (*jvm)->GetEnv(jvm, (void**)&env, JNI_VERSION_1_4); inheritance = (*env)->FindClass(env, "Inheritance"); o_inheritance = (*env)->NewObject(env, inheritance, (*env)->GetMethodID(env, inheritance, "<init>", "()V")); provider = (*env)->FindClass(env, "Provider"); o_provider = (*env)->NewObject(env, provider, (*env)->GetMethodID(env, provider, "<init>", "()V")); (*env)->CallVoidMethod(env, o_inheritance, (*env)->GetMethodID(env, inheritance, "onChange", "(F)V"), 1.0); //(*env)->CallVoidMethod(env, o_provider, (*env)->GetMethodID(env, provider, "registerChange", "(LListener;)V"), o_inheritance); //(*env)->CallVoidMethod(env, o_provider, (*env)->GetMethodID(env, provider, "sendMsg", "()V")); (*env)->DeleteLocalRef(env, o_inheritance); (*env)->DeleteLocalRef(env, o_provider); return JNI_VERSION_1_4; } JNIEXPORT void JNICALL Java_Inheritance_onChange(JNIEnv *env, jobject self, jfloat f) { printf("[C] %f\n", f); } The header file: #include <jni.h> /* Header for class Inheritance */ #ifndef _Included_Inheritance #define _Included_Inheritance #ifdef __cplusplus extern "C" { #endif jclass inheritance, provider; jobject o_inheritance, o_provider; /* * Class: Inheritance * Method: onChange * Signature: (F)V */ JNIEXPORT void JNICALL Java_Inheritance_onChange(JNIEnv *, jobject, jfloat); jint JNI_OnLoad(JavaVM *, void *); #ifdef __cplusplus } #endif #endif Compilation: gcc -c -fPIC -I /usr/lib/jvm/java-6-openjdk/include -I /usr/lib/jvm/java-6-openjdk/include/linux/inheritance.c inheritance.h gcc -g -o -shared libinheritance.so -shared -Wl,-soname,libinheritance.so -lc inheritance.o

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• Asynchronous readback from opengl front buffer using multiple PBO's

  - by KillianDS

  I am developing an application that needs to read back the whole frame from the front buffer of an openGL application. I can hijack the application's opengl library and insert my code on swapbuffers. At the moment I am successfully using a simple but excruciating slow glReadPixels command without PBO's. Now I read about using multiple PBO's to speed things up. While I think I've found enough resources to actually program that (isn't that hard), I have some operational questions left. I would do something like this: create a series (e.g. 3) of PBO's use glReadPixels in my swapBuffers override to read data from front buffer to a PBO (should be fast and non-blocking, right?) Create a seperate thread to call glMapBufferARB, once per PBO after a glReadPixels, because this will block until the pixels are in client memory. Process the data from step 3. Now my main concern is of course in steps 2 and 3. I read about glReadPixels used on PBO's being non-blocking, will this be an issue if I issue new opengl commands after that very fast? Will those opengl commands block? Or will they continue (my guess), and if so, I guess only swapbuffers can be a problem, will this one stall or will glReadPixels from front buffer be many times faster than swapping (about each 15-30ms) or, worst case scenario, will swapbuffers be executed while glReadPixels is still reading data to the PBO? My current guess is this logic will do something like this: copy FRONT_BUFFER - generic place in VRAM, copy VRAM-RAM. But I have no idea which of those 2 is the real bottleneck and more, what the influence on the normal opengl command stream is. Then in step 3. Is it wise to do this asynchronously in a thread separated from normal opengl logic? At the moment I think not, It seems you have to restore buffer operations to normal after doing this and I can't install synchronization objects in the original code to temporarily block those. So I think my best option is to define a certain swapbuffer delay before reading them out, so e.g. calling glReadPixels on PBO i%3 and glMapBufferARB on PBO (i+2)%3 in the same thread, resulting in a delay of 2 frames. Also, when I call glMapBufferARB to use data in client memory, will this be the bottleneck or will glReadPixels (asynchronously) be the bottleneck? And finally, if you have some better ideas to speed up frame readback from GPU in opengl, please tell me, because this is a painful bottleneck in my current system. I hope my question is clear enough, I know the answer will probably also be somewhere on the internet but I mostly came up with results that used PBO's to keep buffers in video memory and do processing there. I really need to read back the front buffer to RAM and I do not find any clear explanations about performance in that case (which I need, I cannot rely on "it's faster", I need to explain why it's faster). Thank you

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• Control third check box based on the state of the first two using jquery

  - by Moj

  I have three check boxes and need to disable the third if either and/or of the other two are checked. I'm sure there's a easier way than what I have currently. It's turning into what I believe is a mess and I'm hoping that someone with more jquery knowledge can shine the light here. Here's my simple html form: <html> <head> <script type="text/javascript" src="jquery.js"></script> <script src="custom.js" type="text/javascript"></script> </head> <body> <input type="checkbox" class="class" id="1">First <input type="checkbox" class="class" id="2">Second <input type="checkbox" class="class" id="3">Third </body> </html> Here's the javascript I'm using with jquery v1.4.2 jQuery(document).ready(function() { // watches the events of all checkboxes $(":checkbox").click(function(){ if( // if both 1 and 2 are checked we don't want to enable Third until both are unchecked. (($('#1:checkbox').attr('checked'))&&($('#2:checkbox').attr('checked')))|| ((($('#1:checkbox').attr('checked'))&&($('#2:checkbox').attr('checked')))&&($('#3:checkbox').attr('disabled')))|| ((($('#1:checkbox').attr('checked'))||($('#2:checkbox').attr('checked')))&&($('#3:checkbox').attr('disabled'))) ){ // we don't want to do anything in the above events } else if( // handles the First check box (($('#1:checkbox').attr('checked'))||(!$('#1:checkbox').attr('checked')))|| // handles the Second check box (($('#2:checkbox').attr('checked'))||(!$('#2:checkbox').attr('checked'))) ){ // call the disableThird function disableThird(); } }); // handles enabling and disabling the Third checkbox function disableThird(){ var $checkbox = $('#3:checkbox'); $checkbox.attr('disabled', !$checkbox.attr('disabled')); }; }); For some reason checking #3 will disable it's self. I don't understand why. This works, but one of the requirements is that a non programmer should be able to edit and maintain this. Ideally it'd be great if he could just add new check boxes to the html and it would work. The class for these are define and as far as I know can't be changed. The last check box in the list of check boxes will disable if any of the ones above are selected. Like wise if the last check box is selected, it will disable all the ones above it. I haven't even begun writing and testing that portion as this is quickly becoming too complicated for a non programmer to handle. I myself am more of a PHP coder than a js, let alone jquery, coder. Any help would be greatly appreciated.

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• jquery and requirejs and knockout; reference requirejs object from within itself

  - by Thomas

  We use jquery and requirejs to create a 'viewmodel' like this: define('vm.inkoopfactuurAanleveren', ['jquery', 'underscore', 'ko', 'datacontext', 'router', 'messenger', 'config', 'store'], function ($, _, ko, datacontext, router, messenger, config, store) { var isBusy = false, isRefreshing = false, inkoopFactuur = { factuurNummer: ko.observable("AAA") }, activate = function (routeData, callback) { messenger.publish.viewModelActivated({ canleaveCallback: canLeave }); getNewInkoopFactuurAanleveren(callback); var restricteduploader = new qq.FineUploader({ element: $('#restricted-fine-uploader')[0], request: { endpoint: 'api/InkoopFactuurAanleveren', forceMultipart: true }, multiple: false, failedUploadTextDisplay: { mode: 'custom', maxChars: 250, responseProperty: 'error', enableTooltip: true }, text: { uploadButton: 'Click or Drop' }, showMessage: function (message) { $('#restricted-fine-uploader').append('<div class="alert alert-error">' + message + '</div>'); }, debug: true, callbacks: { onComplete: function (id, fileName, responseJSON) { var response = responseJSON; }, } }); }, invokeFunctionIfExists = function (callback) { if (_.isFunction(callback)) { callback(); } }, loaded = function (factuur) { inkoopFactuur = factuur; var ids = config.viewIds; ko.applyBindings(this, getView(ids.inkoopfactuurAanleveren)); /*<----- THIS = OUT OF SCOPE!*/ / }, bind = function () { }, saved = function (success) { var s = success; }, saveCmd = ko.asyncCommand({ execute: function (complete) { $.when(datacontext.saveNewInkoopFactuurAanleveren(inkoopFactuur)) .then(saved).always(complete); return; }, canExecute: function (isExecuting) { return true; } }), getView = function (viewName) { return $(viewName).get(0); }, getNewInkoopFactuurAanleveren = function (callback) { if (!isRefreshing) { isRefreshing = true; $.when(datacontext.getNewInkoopFactuurAanleveren(dataOptions(true))).then(loaded).always(invokeFunctionIfExists(callback)); isRefreshing = false; } }, dataOptions = function (force) { return { results: inkoopFactuur, // filter: sessionFilter, //sortFunction: sort.sessionSort, forceRefresh: force }; }, canLeave = function () { return true; }, forceRefreshCmd = ko.asyncCommand({ execute: function (complete) { //$.when(datacontext.sessions.getSessionsAndAttendance(dataOptions(true))) // .always(complete); complete; } }), init = function () { // activate(); // Bind jQuery delegated events //eventDelegates.sessionsListItem(gotoDetails); //eventDelegates.sessionsFavorite(saveFavorite); // Subscribe to specific changes of observables //addFilterSubscriptions(); }; init(); return { activate: activate, canLeave: canLeave, inkoopFactuur: inkoopFactuur, saveCmd: saveCmd, forceRefreshCmd: forceRefreshCmd, bind: bind, invokeFunctionIfExists: invokeFunctionIfExists }; }); On the line ko.applyBindings(this, getView(ids.inkoopfactuurAanleveren)); in the 'loaded' method the 'this' keyword doens't refer to the 'viewmodel' object. the 'self' keyword seems to refer to a combination on methods found over multiple 'viewmodels'. The saveCmd property is bound through knockout, but gives an error since it cannot be found. How can the ko.applyBindings get the right reference to the viewmodel? In other words, with what do we need to replace the 'this' keyword int he applyBindings. I would imagine you can 'ask' requirejs to give us the ealiers instantiated object with identifier 'vm.inkoopfactuurAanleveren' but I cannot figure out how.

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• I need help with this ogre dependent header (Qgears)

  - by commodore

  I'm 2 errors away from compiling Qgears. (Hacked Version of the Final Fantasy VII Engine) I've messed with the preprocessors to load the actual location of the ogre header files. Here are the errors: ||=== qgears, Debug ===| /home/cj/Desktop/qgears/trunk/project/linux/src/core/TextManager.h|48|error: invalid use of ‘::’| /home/cj/Desktop/qgears/trunk/project/linux/src/core/TextManager.h|48|error: expected ‘;’ before ‘m_LanguageRoot’| ||=== Build finished: 2 errors, 0 warnings ===| Here's the header file: // $Id$ #ifndef TEXT_MANAGER_h #define TEXT_MANAGER_h #include <OGRE/OgreString.h> #include <OGRE/OgreUTFString.h> #include <map> struct TextData { TextData(): text(""), width(0), height(0) { } Ogre::String name; Ogre::UTFString text; int width; int height; }; typedef std::vector<TextData> TextDataVector; class TextManager { public: TextManager(void); virtual ~TextManager(void); void SetLanguageRoot(const Ogre::String& root); void LoadTexts(const Ogre::String& file_name); void UnloadTexts(const Ogre::String& file_name); const TextData GetText(const Ogre::String& name); private: struct TextBlock { Ogre::String block_name; std::vector<TextData> text; } Ogre::String m_LanguageRoot; // Line #48 std::list<TextBlock> m_Texts; }; extern TextManager* g_TextManager; #endif // TEXT_MANAGER_h The only header file that's in include that's not a ogre header file is "map". If it helps, I'm using the Code::Blocks IDE/GCC Compiler in GNU/Linux. (Arch) I'm not sure even if I get this header fixed, I think I'll have build errors latter, but it's worth a shot. Edit: I added the semicolon and I have one more error in the header file: error: expected unqualified-id before ‘{’ token

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• How to combine a relative top with an absolute bottom in CSS?

  - by ceving

  I need to define a div which must stay with the top at the normal position, which differs from the top of the surrounding element: position:relative top:0 and which grows in the height up to the size of the surrounding element: position:absolute bottom:0 I have no idea how to combine the both. Whenever I use a relative box I loose the absolute bottom and whenever I use an absolute box I loose the relative top. Can anybody help me how to do this in CSS? Here is an example: <html> <head> </head> <style type="text/css"> @media screen { body { position: absolute; top: 0; left: 0; right: 0; bottom: 0; margin: 0; padding: 0; } #head { background-color: gray; } #rel { background-color: green; position: relative; top: 0; bottom: 0; float: left; } #abs { background-color: red; position: absolute; top: 0; bottom: 0; float: left; } } </style> <body> <div id="head"> <h1>Head</h1> </div> <div id="abs"> <h2>absolute</h2> </div> <div id="rel"> <h2>relative</h2> </div> </body> </html> "relative" does not grow at all and "absolute" grows too much.

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• Set default form textfield value (webbrowser control)

  - by Khou

  Hi I would like my application to load a webpage and set default the form textfield value a predefine value. Requirements: -The application is a windows form, it is to use the web browser control, to load a web page. -Textfield values are define by within the application. -When textfield on the webpage matches the applications predefined elements, the predefine fixed value is set and can not be changed by the end user. Example If my application defines element "FirstName" equal to value "John", the text field for value for element "FirstName" will always equal "John" and this value can not be changed by the end user. Below is html/javascript code to perform this functionality, now how do I implement this in a windows form? (without having to modify the loaded webpage source code (if possible). HTML <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>page title</title> <script script type="text/javascript" src="demo1.js"></script> </head> <body onload="def(document.someform, 'name', 'my default name value');"> <h2 style="color: #8e9182">test form title</h2> <form name="someform" id="someform_frm" action="#"> <table cellspacing="1"> <tr><td><label for="name">NameX: </label></td><td><input type="text" size="30" maxlength="155" name="name" onchange="def(document.someform, 'name', 'my default name value');"></td></tr> <tr><td><label for="name2">NameY: </label></td><td><input type="text" size="30" maxlength="155" name="name2"></td></tr> <tr><td colspan="2"><input type="button" name="submit" value="Submit" onclick="showFormData(this.form);" ></td></table> </form> </body> </html> JAVASCRIPT function def(oForm, element_name, def_txt) { oForm.elements[element_name].value = def_txt; }

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• Mixing application modules between Silverlight and ASP.NET

  - by jkohlhepp

  Background: I work in a suite of ASP.NET applications that have several different "modules". The applications all share a main menu, so they all link to one-another. The modules are the high-level areas of the application. So, for example, it might be Payments, Orders, Customers, Products, etc. And Payments and Orders are in one app and Products and Customers are in another. Some of these menu links are "deep links", for example it might be a link to a particular page within the Customers module, such as Create New Customer. The issue: We are about to start a project that will add several more modules to this suite, probably as a new .NET application. I'm thinking about doing these new modules in Silverlight (for various reasons that are not material to the question). If I were to do that, I need to make the menu look the same as the menu in ASP.NET, as the users still need to feel like they are inside one "application". My questions: How should I organize the Silverlight project(s) so that I can "deep link" from ASP.NET pages into particular modules in the Silverlight app? What is even the best idea for creating these different Silverlight "modules"? If I had something that would've been a page in ASP.NET (for example - Create Customer), should each one of those be a separate Silverlight app? Or should it be a separate User Control? Or something else? Should I reuse our shared ASP.NET menu, and deep link to different Silverlight "modules" even within the new application? Or should I reimplement the menu in Silverlight for navigation within the app? Are there menu controls for Silverlight that look similar to ASP.NET menus (with flyout submenus in this case)? Could I maybe even share a SiteMap XML file between them? Edit: After looking around a bit more, it seems like PRISM might be the answer for some of my issues. It would allow me to modularize the different chunks of Silverlight that I have. And it would allow me to define a "master page" in Silverlight where I could host the menu. Do I have this right?

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• Storing a set of criteria in another table

  - by bendataclear

  I have a large table with sales data, useful data below: RowID Date Customer Salesperson Product_Type Manufacturer Quantity Value 1 01-06-2004 James Ian Taps Tap Ltd 200 £850 2 02-06-2004 Apple Fran Hats Hats Inc 30 £350 3 04-06-2004 James Lawrence Pencils ABC Ltd 2000 £980 ... Many rows later... ... 185352 03-09-2012 Apple Ian Washers Tap Ltd 600 £80 I need to calculate a large set of targets from table containing values different types, target table is under my control and so far is like: TargetID Year Month Salesperson Target_Type Quantity 1 2012 7 Ian 1 6000 2 2012 8 James 2 2000 3 2012 9 Ian 2 6500 At present I am working out target types using a view of the first table which has a lot of extra columns: SELECT YEAR(Date) , MONTH(Date) , Salesperson , Quantity , CASE WHEN Manufacturer IN ('Tap Ltd','Hats Inc') AND Product_Type = 'Hats' THEN True ELSE False END AS IsType1 , CASE WHEN Manufacturer = 'Hats Inc' AND Product_Type IN ('Hats','Coats') THEN True ELSE False END AS IsType2 ... ... , CASE WHEN Manufacturer IN ('Tap Ltd','Hats Inc') AND Product_Type = 'Hats' THEN True ELSE False END AS IsType24 , CASE WHEN Manufacturer IN ('Tap Ltd','Hats Inc') AND Product_Type = 'Hats' THEN True ELSE False END AS IsType25 FROM SalesTable WHERE [some stuff here] This is horrible to read/debug and I hate it!! I've tried a few different ways of simplifying this but have been unable to get it to work. The closest I have come is to have a third table holding the definition of the types with the values for each field and the type number, this can be joined to the tables to give me the full values but I can't work out a way to cope with multiple values for each field. Finally the question: Is there a standard way this can be done or an easier/neater method other than one column for each type of target? I know this is a complex problem so if anything is unclear please let me know. Edit - What I need to get: At the very end of the process I need to have targets displayed with actual sales: Type Year Month Salesperson TargetQty ActualQty 2 2012 8 James 2000 2809 2 2012 9 Ian 6500 6251 Each row of the sales table could potentially satisfy 8 of the types. Some more points: I have 5 different columns that need to be defined against the targets (or set to NULL to include any value) I have between 30 and 40 different types that need to be defined, several of the columns could contain as many as 10 different values For point 2, if I am using a row for each permutation of values, 2 columns with 10 values each would give me 100 rows for each sales person for each month which is a lot but if this is the only way to define multiple values I will have to do this. Sorry if this makes no sense!

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• user generated / user specific functions

  - by pedalpete

  I'm looking for the most elegant and secure method to do the following. I have a calendar, and groups of users. Users can add events to specific days on the calendar, and specify how long each event lasts for. I've had a few requests from users to add the ability for them to define that events of a specific length include a break, of a certain amount of time, or require that a specific amount of time be left between events. For example, if event is 2 hours, include a 20min break. for each event, require 30 minutes before start of next event. The same group that has asked for an event of 2 hours to include a 20 min break, could also require that an event 3 hours include a 30 minute break. In the end, what the users are trying to get is an elapsed time excluding breaks calculated for them. Currently I provide them a total elapsed time, but they are looking for a running time. However, each of these requests is different for each group. Where one group may want a 30 minute break during a 2 hour event, and another may want only 10 minutes for each 3 hour event. I was kinda thinking I could write the functions into a php file per group, and then include that file and do the calculations via php and then return a calculated total to the user, but something about that doesn't sit right with me. Another option is to output the groups functions to javascript, and have it run client-side, as I'm already returning the duration of the event, but where the user is part of more than one group with different rules, this seems like it could get rather messy. I currently store the start and end time in the database, but no 'durations', and I don't think I should be storing the calculated totals in the db, because if a group decides to change their calculations, I'd need to change it throughout the db. Is there a better way of doing this? I would just store the variables in mysql, but I don't see how I can then say to mysql to calculate based on those variables. I'm REALLY lost here. Any suggestions? I'm hoping somebody has done something similar and can provide some insight into the best direction. If it helps, my table contains eventid, user, group, startDate, startTime, endDate, endTime, type The json for the event which I return to the user is {"eventid":"'.$eventId.'", "user":"'.$userId.'","group":"'.$groupId.'","type":"'.$type.'","startDate":".$startDate.'","startTime":"'.$startTime.'","endDate":"'.$endDate.'","endTime":"'.$endTime.'","durationLength":"'.$duration.'", "durationHrs":"'.$durationHrs.'"} where for example, duration length is 2.5 and duration hours is 2:30.

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• What do you expect from a package manager for Emacs

  - by tarsius

  Although several hundred Emacs Lisp libraries exist GNU Emacs does not have an (internal) package manager. I guess that most users would agree that it is currently rather inconvenient to find, install and especially keep up-to-date Emacs Lisp libraries. These pages make life a bit easier Emacs Lisp List - Problem: I see dead people (links). Emacswiki - Problem: May contain traces of nuts (malicious code). These are some package managers XEmacs package manager package.el - ELPA pases install.el install-elisp.el plugin.el use-package.el jem-pkg.el epkg/elm - the one I am working. And this are some packages that provide functionality that might be useful in a package manager ell.el - Browse the Emacs Lisp List genauto.el - helps generate autoloads for your elisp packages date-calc.el - date calculation and parsing routines strptime.el - partial implementation of POSIX date and time parsing wikirel.el - Visit relevant pages on the Emacs Wiki loadhist.el, lib-requires.el, elisp-depend.el - Commands to list Emacs Lisp library dependencies. project-root.el - Define a project root and take actions based upon it So I would like to know from you what you consider important/unimportant/supplementary... in a package manager for Emacs. Some ideas Many packages (incorporate the Emacs Lisp List and other lists of libraries). Only packages that have been tested. Support for more than one package archive (so people can choose between many/tested packages). Dependency calculated based on required features only. Dependencies take particular versions into account. Only use versions that have been released upstream. Use versions from version control systems if available. Packages are categorized. Packages can be uninstalled and updated not only installed. Support creating fork of upstream version of packages. Support publishing these forks. Support choosing a fork. After installation packages are activated. Generate autoloads. Integration with Emacswiki (see wikirel.el). Users can tag, comment ... packages and share that information. Only FSF-assigned/GPL/FOSS software or don't care about license. Package manager should be integrated in Emacs. Support contacting author. Lots of metadata. Suggest alternatives before installing a particular package. Some discussions about the subject at hand emacs-devel 20080801 comp.emacs 20021121 RationalElispPackaging I am hoping for these kinds of answers Pointers to more implementations, discussions etc. Lengthy descriptions of a set of features that make up your ideal package manager. Descriptions of one particular disired/undisired feature. This has the advantage that the regular voting mechanism allows us to see what features are most welcomed. Feel free to elaborate on my ideas from above. Surprise me.

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• How to use Broadcast Receiver in different Applications in Android?

  - by Sebi

  Hi I have here two applications in two different projects in eclipse. One application (A) defines an activity (A1) which is started first. Then i start from this activity the second activity (B1) in the second project (B). This works fine. I start it the following way: Intent intent = new Intent("pacman.intent.action.Launch"); intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); startActivity(intent); Now i want to send intents bewtween the two activities by using broadcast receivers. In activity A1 i send the intents the following way: Intent intent = new Intent("pacman.intent.action.BROADCAST"); intent.putExtra("message","Wake up."); sendBroadcast(intent); The part of the manifest file in activity A1 that is responsible for this broadcast is the following: <activity android:name="ch.ifi.csg.games4blue.games.pacman.controller.PacmanGame" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> <intent-filter> <action android:name="android.intent.action.BROADCAST" /> </intent-filter> </activity> In the receiving activity, I define the receiver the following way in the manifest file: <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".PacmanGame" android:label="@string/app_name" android:screenOrientation="portrait"> <intent-filter> <action android:name="pacman.intent.action.Launch" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> <receiver android:name="ch.ifi.csg.games4blue.games.pacman.controller.MsgListener" /> </activity> </application> The class message listener is implemented this way: public class MsgListener extends BroadcastReceiver { /* (non-Javadoc) * @see android.content.BroadcastReceiver#onReceive(android.content.Context, android.content.Intent) */ @Override public void onReceive(Context context, Intent intent) { System.out.println("Message at Pacman received!"); } } Unfortunately, the message is never received. Although the method in activity A1 is called, i never receive an intent in B1. Any hints how to solve this? Thanks a lot!

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• JavaCC: Please help me understand token ambiguity.

  - by java.is.for.desktop

  Hello, everyone! I had already many problems with understanding, how ambiguous tokens can be handled elegantly (or somehow at all) in JavaCC. Let's take this example: I want to parse XML processing instruction. The format is: "<?" <target> <data> "?>": target is an XML name, data can be anything except ?>, because it's the closing tag. So, lets define this in JavaCC: (I use lexical states, in this case DEFAULT and PROC_INST) TOKEN : <#NAME : (very-long-definition-from-xml-1.1-goes-here) > TOKEN : <WSS : (" " | "\t")+ > // WSS = whitespaces <DEFAULT> TOKEN : {<PI_START : "<?" > : PROC_INST} <PROC_INST> TOKEN : {<PI_TARGET : <NAME> >} <PROC_INST> TOKEN : {<PI_DATA : ~[] >} // accept everything <PROC_INST> TOKEN : {<PI_END : "?>" > : DEFAULT} Now the part which recognizes processing instructions: void PROC_INSTR() : {} { ( <PI_START> (t=<PI_TARGET>){System.out.println("target: " + t.image);} <WSS> (t=<PI_DATA>){System.out.println("data: " + t.image);} <PI_END> ) {} } The problem is (i guess): hence <PI_DATA> recognizes "everything", my definition is wrong. Let's test it with <?mytarget here-goes-some-data?>: The target is recognized: "target: mytarget". But now I get my favorite JavaCC parsing error: !! procinstparser.ParseException: Encountered "" at line 1, column 15. !! Was expecting one of: !! Encountered nothing? Was expecting nothing? Or what? Thank you, JavaCC! I know, that I could use the MORE keyword of JavaCC, but this would give me the whole processing instruction as one token, so I'd had to parse/tokenize it further by myself. Why should I do that? Am I writing a parser that does not parse? What I would need is telling JavaCC to recognize "everything until ?>" as processing instruction data. How can it be done? Thank you.

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• Need help programming with Mclauren series and Taylor series!

  - by user352258

  Ok so here's what i have so far: #include <stdio.h> #include <math.h> //#define PI 3.14159 int factorial(int n){ if(n <= 1) return(1); else return(n * factorial(n-1)); } void McLaurin(float pi){ int factorial(int); float x = 42*pi/180; int i, val=0, sign; for(i=1, sign=-1; i<11; i+=2){ sign *= -1; // alternate sign of cos(0) which is 1 val += (sign*(pow(x, i)) / factorial(i)); } printf("\nMcLaurin of 42 = %d\n", val); } void Taylor(float pi){ int factorial(int); float x; int i; float val=0.00, sign; float a = pi/3; printf("Enter x in degrees:\n"); scanf("%f", &x); x=x*pi/180.0; printf("%f",x); for(i=0, sign=-1.0; i<2; i++){ if(i%2==1) sign *= -1.0; // alternate sign of cos(0) which is 1 printf("%f",sign); if(i%2==1) val += (sign*sin(a)*(pow(x-a, i)) / factorial(i)); else val += (sign*cos(a)*(pow(x-a, i)) / factorial(i)); printf("%d",factorial(i)); } printf("\nTaylor of sin(%g degrees) = %d\n", (x*180.0)/pi, val); } main(){ float pi=3.14159; void McLaurin(float); void Taylor(float); McLaurin(pi); Taylor(pi); } and here's the output: McLaurin of 42 = 0 Enter x in degrees: 42 0.733038-1.00000011.0000001 Taylor of sin(42 degrees) = -1073741824 I suspect the reason for these outrageous numbers goes with the fact that I mixed up my floats and ints? But i just cant figure it out...!! Maybe its a math thing, but its never been a strength of mine let alone program with calculus. Also the Mclaurin fails, how does it equal zero? WTF! Please help correct my noobish code. I am still a beginner...

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• Infinite loop when using fscanf

  - by user1409641

  I wrote this simple program in C, because I'm studying FILES right now at University. I take a txt file with a list of the results of the last race so my program will show the data formatted as I want. Here's my code: /* Esercizio file Motogp */ #include <stdio.h> #define SIZE 20 int main () { int pos, punt, num; float kmh; char nome[SIZE+1], cognome[SIZE+1], moto[SIZE+1]; char naz[SIZE+1], nome_file[SIZE+1]; FILE *fp; printf ("Inserisci il nome del file da aprire: "); gets (nome_file); fp = fopen (nome_file, "r"); if (fopen == NULL) printf ("Errore nell' apertura del file %s\n", nome_file); else { while (fscanf (fp, "%d %d %d %s %s %s %s %.2f", &pos, &punt, &num, nome, cognome, naz, moto, &kmh) != EOF ) { printf ("Posizione di arrivo: %d\n", pos); printf ("Punteggio: %d\n", punt); printf ("Numero pilota: %d\n", num); printf ("Nome pilota: %s\n", nome); printf ("Cognome pilota: %s\n", cognome); printf ("Nazione: %s\n", naz); printf ("Moto: %s\n", moto); printf ("Media Kmh: %d\n\n", kmh); } } fclose(fp); return 0; } and there's my txt file: 1 25 99 Jorge LORENZO SPA Yamaha 164.4 2 20 26 Dani PEDROSA SPA Honda 164.1 3 16 4 Andrea DOVIZIOSO ITA Yamaha 163.8 4 13 1 Casey STONER AUS Honda 163.8 5 11 35 Cal CRUTCHLOW GBR Yamaha 163.6 6 10 19 Alvaro BAUTISTA SPA Honda 163.5 7 9 46 Valentino ROSSI ITA Ducati 163.3 8 8 6 Stefan BRADL GER Honda 162.9 9 7 69 Nicky HAYDEN USA Ducati 162.5 10 6 11 Ben SPIES USA Yamaha 162.3 11 5 8 Hector BARBERA SPA Ducati 162.1 12 4 17 Karel ABRAHAM CZE Ducati 160.9 13 3 41 Aleix ESPARGARO SPA ART 160.2 14 2 51 Michele PIRRO ITA FTR 160.1 15 1 14 Randy DE PUNIET FRA ART 160.0 16 0 77 James ELLISON GBR ART 159.9 17 0 54 Mattia PASINI ITA ART 159.4 18 0 68 Yonny HERNANDEZ COL BQR 159.4 19 0 9 Danilo PETRUCCI ITA Ioda 158.2 20 0 22 Ivan SILVA SPA BQR 158.2 When I run my program, it return me an infinite loop of the first one. Why? Is there another function to read those data?

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• Getting results in a result set from dynamic SQL in Oracle

  - by msorens

  This question is similar to a couple others I have found on StackOverflow, but the differences are signficant enough to me to warrant a new question, so here it is: I want to obtain a result set from dynamic SQL in Oracle and then display it as a result set in a SqlDeveloper-like tool, just as if I had executed the dynamic SQL statement directly. This is straightforward in SQL Server, so to be concrete, here is an example from SQL Server that returns a result set in SQL Server Management Studio or Query Explorer: EXEC sp_executesql N'select * from countries' Or more properly: DECLARE @stmt nvarchar(100) SET @stmt = N'select * from countries' EXEC sp_executesql @stmt The question "How to return a resultset / cursor from a Oracle PL/SQL anonymous block that executes Dynamic SQL?" addresses the first half of the problem--executing dynamic SQL into a cursor. The question "How to make Oracle procedure return result sets" provides a similar answer. Web search has revealed many variations of the same theme, all addressing just the first half of my question. I found this post explaining how to do it in SqlDeveloper, but that uses a bit of functionality of SqlDeveloper. I am actually using a custom query tool so I need the solution to be self-contained in the SQL code. This custom query tool similarly does not have the capability to show output of print (dbms_output.put_line) statements; it only displays result sets. Here is yet one more possible avenue using 'execute immediate...bulk collect', but this example again renders the results with a loop of dbms_output.put_line statements. This link attempts to address the topic but the question never quite got answered there either. Assuming this is possible, I will add one more condition: I would like to do this without having to define a function or procedure (due to limited DB permissions). That is, I would like to execute a self-contained PL/SQL block containing dynamic SQL and return a result set in SqlDeveloper or a similar tool. So to summarize: I want to execute an arbitrary SQL statement (hence dynamic SQL). The platform is Oracle. The solution must be a PL/SQL block with no procedures or functions. The output must be generated as a canonical result set; no print statements. The output must render as a result set in SqlDeveloper without using any SqlDeveloper special functionality. Any suggestions?

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