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  • MySQL Limiting a query to one consistent value

    - by Lucas Matos
    My current query returns a table like: +------------+ value1 | .... value1 | .... value2 | .... value3 | .... +------------+ I want: +------------+ value1 | .... value1 | .... +------------+ I want to only receive all rows with the first value. Normally I would do a WHERE clause if I knew that value, and I cannot use a LIMIT because each value has a different number of rows. Right now My query looks like "SELECT u.*, n.something, w.* FROM ... AS u, ... AS n, ... AS w WHERE u.id = n.id AND w.val = n.val AND u.desc LIKE '%GET REQUEST VARIABLE%';" This works great, except I get way too many rows and using PHP to do this ruins code portability and is superfluous. Thanks for reading

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  • How do you extend a Ruby module with macro-like metaprogramming methods?

    - by Ian Terrell
    Consider the following extension (the pattern popularized by several Rails plugins over the years): module Extension def self.included(recipient) recipient.extend ClassMethods recipient.class_eval { include InstanceMethods } end module ClassMethods def macro_method puts "Called macro_method within #{self.name}" end end module InstanceMethods def instance_method puts "Called instance_method within #{self.object_id}" end end end If you wished to expose this to every class, you can do the following: Object.send :include, Extension Now you can define any class and use the macro method: class FooClass macro_method end #=> Called macro_method within FooClass And instances can use the instance methods: FooClass.new.instance_method #=> Called instance_method within 2148182320 But even though Module.is_a?(Object), you cannot use the macro method in a module: module FooModule macro_method end #=> undefined local variable or method `macro_method' for FooModule:Module (NameError) This is true even if you explicitly include the original Extension into Module with Module.send(:include, Extension). How do you add macro like methods to Ruby modules?

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  • can we write this in C++ switch ?

    - by jellly
    #include <iostream> using namespace std; int main(){ char i; cin >>i; switch (i){ case ('e'||'i'||'o'||'u'||'a'): cout<<"Vowel"; break; case ('+'||'-'||'/'||'*'||'%'): cout<<"Op"; break; } return 0; } if not than how can we use comparison or logical operators in switch ? & why cant we declare and initialize variable in single case without using scope ?

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  • More elegant way to initialize list of duplicated items in Python

    - by Claudiu
    If I want a list initialized to 5 zeroes, that's very nice and easy: [0] * 5 However if I change my code to put a more complicated data structure, like a list of zeroes: [[0]] * 5 will not work as intended, since it'll be 10 copies of the same list. I have to do: [[0] for i in xrange(5)] that feels bulky and uses a variable so sometimes I even do: [[0] for _ in " "] But then if i want a list of lists of zeros it gets uglier: [[[0] for _ in " "] for _ in " "] all this instead of what I want to do: [[[0]]*5]*5 Has anyone found an elegant way to deal with this "problem"?

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  • JAVA: How do I accept input during a certain period of time only

    - by sebrock
    Im trying to do a simple game where I continually need input from players. This needs to happen during a certain time period only. Everything that is sent after that will be discarded. After the time period a new game starts. So: Start game Wait for input from all players during 10 seconds 10 secs no more input Calculate the winner and do some stuff Goto 1. I was thinking using a timer and timertask to keep track of time and maybe use a boolean variable that changes from "open" to "closed" after 10 seconds? Please give me some advise on this.

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  • android: getting rid of "warning: unmappable character for encoding ascii"

    - by Lo'oris
    I'm compiling using android tools without eclipse. I compile launching "ant debug" from command line. I have found many many instructions around the web about how to remove with annoying warning, but I haven't been able to make any of them work. I've tried -D option, I've tried randomly tweaking build.* files, I've tried exporting an environment variable... nothing. I guess some of these methods just don't work, and some others would work but I've been doing them incorrectly. Anything is possible and I can't stand it any more: any advice on how to do it?

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  • that, self or me — which one to prefer in JavaScript?

    - by Török Gábor
    While coding JavaScript sometimes you store the reference of object this in a local variable for different purposes (to set proper scope, to help code obfuscators, etc.). There are coders who prefer aliasing this to that to make it obvious its intention. Other guys use self since it's pointing to the object itself. I even saw source codes where me held the reference and it still makes sense. Certainly there are other ones. Which one should I prefer? Is there a convention on which to use or is it only the matter of taste.

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  • How to access a method of a closure's parent object?

    - by Bytecode Ninja
    I have defined a class named MyClass and I have defined two methods myMethod1 and myMethod2 for it: function MyClass() {} MyClass.prototype.myMethod1 = function() {...}; MyClass.prototype.myMethod2 = function() {...}; Inside myMethod1, I use jQuery and there's a callback closure defined there: MyClass.prototype.myMethod2 = function() { $.jQuery({success: function(data) { this.myMethod2(); }, ...}); } Now the problem is that this no longer is referring to MyClass. The question is how can I refer to it? At the moment I have assigned it to a variable named thisObj and access it this way: MyClass.prototype.myMethod2 = function() { var thisObj = this; $.jQuery({success: function(data) { thisObj.myMethod2(); }, ...}); } Is there a better way to access MyClass.this from the closure nested in myMethod2? Thanks in advance.

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  • How do I replace "this" in Java with something that works.

    - by Luke Alderton
    I'm looking to get the showGUI() method work, the compiler says "this" is not a static variable and cannot be referenced from a static context, what would I use to replace "this"? I've tried test.main (test being the package it's in). The reason I'm using the static method showGUI() is because I need the method to be called from another static method, as well as the startup() method. Below are my two main classes. public class Main extends SingleFrameApplication { @Override protected void startup() { showGUI(); } @Override protected void configureWindow(java.awt.Window root) { } public static Main getApplication() { return Application.getInstance(Main.class); } public static void main(String[] args) { launch(Main.class, args); } public static void showGUI() { show(new GUI(this)); } } public class GUI extends FrameView { public GUI(SingleFrameApplication app) { super(app); initComponents(); } private void initComponents() { //all the GUI stuff is somehow defined here } }

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  • the use of private keyword

    - by LAT
    Hi everyone I am new to programming. I am learning Java now, there is something I am not really sure, that the use of private. Why programmer set the variable as private then write , getter and setter to access it. Why not put everything in public since we use it anyway. public class BadOO { public int size; public int weight; ... } public class ExploitBadOO { public static void main (String [] args) { BadOO b = new BadOO(); b.size = -5; // Legal but bad!! } } I found some code like this, and i saw the comment legal but bad. I don't understand why, please explain me.

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  • How do I change the class of an object to a subclass of its current class in C++?

    - by Jared P
    I have an array of pointers to a base class, so that I can make those pointers point to (different) subclasses of the base class, but still interact with them. (really only a couple of methods which I made virtual and overloaded) I'm wondering if I can avoid using the pointers, and instead just make an array of the base class, but have some way to set the class to the subclass of my choosing. I know there must be something there specifying the class, as it needs to use that to look up the function pointer for virtual methods. By the way, the subclasses all have the same ivars and layout. Note: the design is actually based on using a template argument instead of a variable, due to performance increases, so really the abstract base class is just the interface for the subclasses, which are all the same except for their compiled code. Thanks

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  • PHP and Java interoperablity

    - by Jack
    I am working on windows using tomcat 6 and PHP/Java Bridge. I know how to access a Java file from PHP but how do we do it the other way i.e accessing PHP from Java <?php require_once("java\Java.inc"); $systemInfo = new Java("java.lang.System"); print "Total seconds since January 1, 1970: ".$systemInfo->currentTimeMillis(); ?> Also how do I access Java classes that are created by me. Do I write a CLASSPATH env variable or change the php.ini config file?

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  • Should member variables of global objects be made global as well?

    - by David Wong
    I'm developing plugins in Eclipse which mandates the use of singleton pattern for the Plugin class in order to access the runtime plugin. The class holds references to objects such as Configuration and Resources. In Eclipse 3.0 plug-in runtime objects are not globally managed and so are not generically accessible. Rather, each plug-in is free to declare API which exposes the plug-in runtime object (e.g., MyPlugin.getInstance() In order for the other components of my system to access these objects, I have to do the following: MyPlugin.getInstance().getConfig().getValue(MyPlugin.CONFIGKEY_SOMEPARAMETER); , which is overly verbose IMO. Since MyPlugin provides global access, wouldn't it be easier for me to just provide global access to the objects it manages as well? MyConfig.getValue(MyPlugin.CONFIGKEY_SOMEPARAMETER); Any thoughts? (I'm actually asking because I was reading about the whole "Global variable access and singletons are evil" debates)

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  • Accessing object's method within string

    - by Wild One
    Recently I was reading php documentation and found interesting note in string section: Functions, method calls, static class variables, and class constants inside {$} work since PHP 5. However, the value accessed will be interpreted as the name of a variable in the scope in which the string is defined. Using single curly braces ({}) will not work for accessing the return values of functions or methods or the values of class constants or static class variables. See www.php.net/manual/en/language.types.string.php It says, that I can't use curly syntax to get value returned by object's method call. Is it a mistake in manual or I misunderstood it, because I tried the following code and it works just fine: <?php class HelloWorld { public static function hello() { echo 'hello'; } } $a = new HelloWorld(); echo "{$a->hello()} world";

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  • How to write a regular expression for "everything between X and Y" for use with preg_replace

    - by pg
    I want to take a variable called $encoded_str and and remove cd1, CD1 and anything between the first 'l' and the last blank space. So for example "lp6 id4 STRINGcd1" would return "STRING". I'm using PHP 4 for now so I can't use str_ireplace, I have this: $encoded_str=str_replace('CD1','',$encoded_str); $encoded_str=str_replace('cd1','',$encoded_str); $encoded_str=preg_replace('X','',$encoded_str); I've RTFM for preg_replace but am a bit confused. What should I replace the X with and can you suggest a decent introductory primer for writing regular expressions?

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  • Are there any security vulnerabilities in this PHP code?

    - by skorned
    Hi. I just got a site to manage, but am not too sure about the code the previous guy wrote. I'm pasting the login procedure below, could you have a look and tell me if there are any security vulnerabilities? At first glance, it seems like one could get in through SQL injection or manipulating cookies and the ?m= parameter. define ( 'CURRENT_TIME', time ()); / / Current time. define ( 'ONLINE_TIME_MIN', (CURRENT_TIME - BOTNET_TIMEOUT)); / / Minimum time for the status of "Online". define ( 'DEFAULT_LANGUAGE', 'en'); / / Default language. define ( 'THEME_PATH', 'theme'); / / folder for the theme. / / HTTP requests. define ( 'QUERY_SCRIPT', basename ($ _SERVER [ 'PHP_SELF'])); define ( 'QUERY_SCRIPT_HTML', QUERY_SCRIPT); define ( 'QUERY_VAR_MODULE', 'm'); / / variable contains the current module. define ( 'QUERY_STRING_BLANK', QUERY_SCRIPT. '? m ='); / / An empty query string. define ( 'QUERY_STRING_BLANK_HTML', QUERY_SCRIPT_HTML. '? m ='); / / Empty query string in HTML. define ( 'CP_HTTP_ROOT', str_replace ( '\ \', '/', (! empty ($ _SERVER [ 'SCRIPT_NAME'])? dirname ($ _SERVER [ 'SCRIPT_NAME']):'/'))); / / root of CP. / / The session cookie. define ( 'COOKIE_USER', 'p'); / / Username in the cookies. define ( 'COOKIE_PASS', 'u'); / / user password in the cookies. define ( 'COOKIE_LIVETIME', CURRENT_TIME + 2592000) / / Lifetime cookies. define ( 'COOKIE_SESSION', 'ref'); / / variable to store the session. define ( 'SESSION_LIVETIME', CURRENT_TIME + 1300) / / Lifetime of the session. ////////////////////////////////////////////////// ///////////////////////////// / / Initialize. ////////////////////////////////////////////////// ///////////////////////////// / / Connect to the database. if (! ConnectToDB ()) die (mysql_error_ex ()); / / Connecting topic. require_once (THEME_PATH. '/ index.php'); / / Manage login. if (! empty ($ _GET [QUERY_VAR_MODULE])) ( / / Login form. if (strcmp ($ _GET [QUERY_VAR_MODULE], 'login') === 0) ( UnlockSessionAndDestroyAllCokies (); if (isset ($ _POST [ 'user']) & & isset ($ _POST [ 'pass'])) ( $ user = $ _POST [ 'user']; $ pass = md5 ($ _POST [ 'pass']); / / Check login. if (@ mysql_query ( "SELECT id FROM cp_users WHERE name = '". addslashes ($ user). "' AND pass = '". addslashes ($ pass). "' AND flag_enabled = '1 'LIMIT 1") & & @ mysql_affected_rows () == 1) ( if (isset ($ _POST [ 'remember']) & & $ _POST [ 'remember'] == 1) ( setcookie (COOKIE_USER, md5 ($ user), COOKIE_LIVETIME, CP_HTTP_ROOT); setcookie (COOKIE_PASS, $ pass, COOKIE_LIVETIME, CP_HTTP_ROOT); ) LockSession (); $ _SESSION [ 'Name'] = $ user; $ _SESSION [ 'Pass'] = $ pass; / / UnlockSession (); header ( 'Location:'. QUERY_STRING_BLANK. 'home'); ) else ShowLoginForm (true); die (); ) ShowLoginForm (false); die (); ) / / Output if (strcmp ($ _GET [ 'm'], 'logout') === 0) ( UnlockSessionAndDestroyAllCokies (); header ( 'Location:'. QUERY_STRING_BLANK. 'login'); die (); ) ) ////////////////////////////////////////////////// ///////////////////////////// / / Check the login data. ////////////////////////////////////////////////// ///////////////////////////// $ logined = 0, / / flag means, we zalogininy. / / Log in session. LockSession (); if (! empty ($ _SESSION [ 'name']) & &! empty ($ _SESSION [ 'pass'])) ( if (($ r = @ mysql_query ( "SELECT * FROM cp_users WHERE name = '". addslashes ($ _SESSION [' name'])."' AND pass = ' ". addslashes ($ _SESSION [' pass']). " 'AND flag_enabled = '1' LIMIT 1 ")))$ logined = @ mysql_affected_rows (); ) / / Login through cookies. if ($ logined! == 1 & &! empty ($ _COOKIE [COOKIE_USER]) & &! empty ($ _COOKIE [COOKIE_PASS])) ( if (($ r = @ mysql_query ( "SELECT * FROM cp_users WHERE MD5 (name )='". addslashes ($ _COOKIE [COOKIE_USER ])."' AND pass = '". addslashes ($ _COOKIE [COOKIE_PASS]). " 'AND flag_enabled = '1' LIMIT 1 ")))$ logined = @ mysql_affected_rows (); ) / / Unable to login. if ($ logined! == 1) ( UnlockSessionAndDestroyAllCokies (); header ( 'Location:'. QUERY_STRING_BLANK. 'login'); die (); ) / / Get the user data. $ _USER_DATA = @ Mysql_fetch_assoc ($ r); if ($ _USER_DATA === false) die (mysql_error_ex ()); $ _SESSION [ 'Name'] = $ _USER_DATA [ 'name']; $ _SESSION [ 'Pass'] = $ _USER_DATA [ 'pass']; / / Connecting language. if (@ strlen ($ _USER_DATA [ 'language'])! = 2 | |! SafePath ($ _USER_DATA [ 'language']) | |! file_exists ( 'system / lng .'.$_ USER_DATA [' language '].' . php'))$_ USER_DATA [ 'language'] = DEFAULT_LANGUAGE; require_once ( 'system / lng .'.$_ USER_DATA [' language'].'. php '); UnlockSession ();

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  • session expires to soon in php

    - by user1669425
    I want to extend a session time so that a session variable does not expire until after 12 hours. Problem is that after 24 minutes (default time for a session until it expires) of inactivity it still expires the session and hence gives me undefined indexes for those SESSION variables. What else do I need to do in the code below in order to be able to extend the sessions so that it does not expire on its own until 12 hours has passed: <?php ini_set('session.gc_maxlifetime',12*60*60); ini_set('session.cookie_lifetime',12*60*60); phpinfo(); session_start(); ....//rest of code below ?> in phpinfo() it states this below for gc_maxlifetime: Local Value Master Value session.gc_maxlifetime 43200 1440 session.cookie_lifetime 43200 0

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  • Declared Properties and assigning values with self

    - by Shaun Budhram
    I understand how declared properties work - I just need a clarification on when Objective C is using the accessor method vs. when it is not. Say I have a property declared using retain: @property (nonatomic, retain) NSDate *date; ... and later... @synthesize date If I say: date = x Is that calling the accessor method? Or is it just setting the variable? self.date = x This seems to call the accessor method (I think but I'm not sure, since it seems like the retain count is increasing). Can anyone clarify this issue? I'm curious because i have some variables that seem to become invalid before I need them (and I have to specifically call retain), and I suspect this is why.

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  • bash tools for parsing arguments

    - by BCS
    I have a bash script that uses a few variables (call them $foo and $bar). Right now the script defines them at the top with hard coded values like this: foo=fooDefault bar=barDefault .... # use $foo and $bar What I want is to be able to use the script like any of these: myscript # use all defaults myscript -foo=altFoo # use default bar myscript -bar=altBar # use default foo myscript -bar=altBar -foo=altFoo An ideal solution would allow me to just list the variable that I want to check for flags for. Is there a reasonably nice way to do this? I've seen getopt and I think it might do about 70% of what I'm looking for but I'm wondering if there is a tool or indium that builds on it or the like that gets the rest.

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  • Django m2m adding field in the secondary table

    - by dana
    I have a model in wich i'm using m2m Django ORM feature, in order to create an aditional table to hold my 'classrom members'. My problem is: the membership to a classroom must be accepted by the invited one, so i need a boolean field :1=accepted, 0=refused/unseen yet. How can i include this boolean variable in the aditionally generated classroom_membership (and NOT in the primary created Classroom table)? class Classroom(models.Model): user = models.ForeignKey(User, related_name = 'classroom_creator') classname = models.CharField(max_length=140, unique = True) date = models.DateTimeField(auto_now=True) open_class = models.BooleanField(default=True) #domain = models.EnumField() members = models.ManyToManyField(User,related_name="list of invited members") Thanks in advance!!

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  • Need JavaScript var in anchor

    - by Helto
    I'm sure this is really simple, but I need some help. I'm trying to insert a variable into an anchor in the following snippet var tablerows = '' $.each( data, function(index,row){ id = row.shift() tablerows += '<tr><td><a href="getuserimage.php?id=" target="_blank">' + row.shift() + '</a></td>' tablerows += '<td>' + row.join('</td><td>') + '</td></tr>' }) $("#users-table > tbody").html(tablerows) I'm just not sure how to get the id in there

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  • pthread_exit return value

    - by Manty
    This is surprising for me. void * thread_func(void *arg) { pthread_exit(&ret); } int main(void) { pthread_t thr; int *exit_status; pthread_create(&thr, NULL, thread_func, NULL); sleep(2); pthread_join(thr, (void **)&exit_status); printf("value of exit status - %d\n", *exit_status); ret = 20; pthread_join(thr, (void **)&exit_status); printf("value of exit status - %d\n", *exit_status); return 0; } The output is value of exit status - 50 value of exit status - 20 I was expecting both the times the exit_status would be the actual exit value(50 in my case) of the thread. Instead it is just returning the value of the global variable which I used for pthread_exit. Is it not a bug?

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  • Specifying routes by subdomain in Express using vhost middleware

    - by user730569
    I'm using the vhost express/connect middleware and I'm a bit confused as to how it should be used. I want to have one set of routes apply to hosts with subdomains, and another set to apply for hosts without subdomains. In my app.js file, I have var app = express.createServer(); app.use...(middlware)... app.use(express.vhost('*.host', require('./domain_routing')("yes")); app.use(express.vhost('host', require('./domain_routing')("no")); app.use...(middlware)... app.listen(8000); and then in domain_routing.js: module.exports = function(subdomain){ var app = express.createServer(); require('./routes')(app, subdomain); return app; } and then in routes.js I plan to run sets of routes, dependent on the subdomain variable passed in is "yes" or "no". Am I on the right track or is this not how you use this middleware?

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  • Wrong cells values of UITableView per section

    - by androniennn
    I have a UITableView that has a different rows count in every section. I made that code to try achieving a correct result: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier= @"channel"; ChannelsCell *cell= [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if(!cell) { cell =[[ChannelsCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } NSInteger rowsCountSection = [[arrayofChannelsCount objectAtIndex:indexPath.section] intValue];// this variable has the number of rows of every section NSUInteger pos = indexPath.section*count+ indexPath.row; cell.channelName.text=[arrayofChannelName objectAtIndex:pos]; return cell; } I'm pretty sure that's a mathematic problem. Thank you for helping.

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  • int i vs int index etc. Which one is better?

    - by Earlz
    Coming from a C background I've always used int i for generic loop variables. Of course in big nested loops or other complex things I may use a descriptive name but which one had you rather see? int i; for(i=0;i<Controls.Count;i++){ DoStuff(Controls[i]); } or int index; for(index=0;index<Controls.Count;index++){ DoStuff(Controls[index]); } In the current project I am working on there are both of these styles and index being replaced by ndx. Which one is better? Is the i variable too generic? Also what about the other C style names? i, j, k Should all of these be replaced by actual descriptive variables?

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