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• Double "!!" in Ruby [closed]

  - by Alex Maslakov

  Possible Duplicate: What does !! mean in ruby? Ruby, !! operator (a/k/a the double-bang) Sometimes I see a Ruby code like this def sent? !!@sent_at end It seems to be not logical. Is it necessary to use here double !? As far as I'm concerned, it might be just def sent? @sent_at end UPDATE: then what is the difference between these def sent? !!@sent_at end def sent? @sent_at.nil? end def sent? @sent_at == nil end

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• dabbledb + iPhone

  - by user193545

  I have been using DabbbleDB online database for storing/retrieving values for one of my iPhone applications. I am using their JSON response for retrieving the records. The problem that I am facing is that if there are a large number of records in the database, it takes a long time to get the response from the server and then to parse the JSON response. Instead I would like to to get a set of records at a time and run a loop to fetch all the records in background. I do not know whether we can query for a set of records at a time from online databases like DabbleDB. Anybody having an idea, please help.

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• Can I use a single pointer for my hash table in C?

  - by aks

  I want to implement a hash table in the following manner: struct list { char *string; struct list *next; }; struct hash_table { int size; /* the size of the table */ struct list **table; /* the table elements */ }; Instead of struct hash_table like above, can I use: struct hash_table { int size; /* the size of the table */ struct list *table; /* the table elements */ }; That is, can I just use a single pointer instead of a double pointer for the hash table elements? If yes, please explain the difference in the way the elements will be stored in the table?

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• Why my query is not working?

  - by Poma

  my website has PHP command: mysql_query("SELECT * FROM users WHERE id=" . $_GET["id"]) or die(mysql_error()); When I enter URL http://example.com/index.php?id=1;%20UPDATE%20users%20SET%20password=123%20WHERE%20id=1 I get following error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE users SET password=abc WHERE id=1' at line 1 But in phpmyamin query executes successfully. What's wrong here? Why it doesn't execute in browser?

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• Graphics Question: How do I restrict the mouse cursor to within a circle?

  - by Dan

  I'm playing with XNA. When I click the left mouse button, I record the X,Y co-ordinates. Keeping the mouse button held down, moving the mouse draws a line from this origin to the current mouse position. I've offset this into the middle of the window. Now, what I'd like to do is restrict the mouse cursor to within a circle (with a radius of N, centred on the middle of the screen). Restricting the mouse to a rectangular region is easy enough (by adjusting the origin by the difference of the mouse position and the size of the region), but I haven't a clue on how to start doing it for a circular region. Can anyone explain how to do this? Any advice on where to start would be helpful.

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• UPDATE statement wrapped in an IF EXISTS block

  - by formica

  I'm trying to write a DML script that updates a column but I wanted to make sure the column existed first so I wrapped it in a IF EXISTS block IF EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='Client' AND COLUMN_NAME='IsClarityEnabled') BEGIN UPDATE Client SET IsClarityEnabled = 1 WHERE ClientID = 21 END So the weirdness is that it tries to execute the update even if it fails the condition. So column doesn't exist and the UPDATE statement runs and I get an error. Why? Even stranger is that this does work: IF EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='Client' AND COLUMN_NAME='IsClarityEnabled') BEGIN EXEC('UPDATE Client SET IsClarityEnabled = 1 WHERE ClientID = 21') END Is there something special about an UPDATE command that causes it to behave this way?

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• Android on Desktop tutorials/resources

  - by Ascension Systems

  I'm aware of the android-x86 project and as far as the end result (bootable live/install iso), I am looking to do the same thing. The difference is, I'm looking to do this with the ice cream sandwich branch from android master repo. Ice cream sandwich adds full support for x86 hardware and even sports a build target specifically for running the OS in virtualbox. So my question is, is anyone aware of any documentation for building and deploying to that target? Just in case it's not clear, I'm not just using the android-x86 project because they haven't yet put up a build for anything later than android 3.

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• PHP class declaration

  - by Ris90

  Is there any way to set explicit type to object field in php? Something like this class House{ private Roof $roof }

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• Given the lat/lon of 2 close points on earth (<10m), How do I calculate the distance in metres?

  - by Rory

  I have the lat/lon of 2 points on the earth. They are really close together, <10m. Let's assume the earth is flat. How do I calculate the distance between them in metres? I know about tools (PostGIS, etc.) that can do this correctly, however I'm just doing a rough and ready type, and I'm OK with low accuracy. At such small sizes a difference of 1% is only 10cm, which is fine for me. I'm doing this in stock python. I'm OK with a standard Euclidean distance thing.

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• why does it use the movl instead of push ?!

  - by user554403

  hi all. pay attention to this code : #include <stdio.h> void a(int a, int b, int c) { char buffer1[5]; char buffer2[10]; } int main() { a(1,2,3); } after that : gcc -S a.c that command shows our source code in assembly. now we can see in the main function, we never use "push" command to push the arguments of the a function into the stack. and it used "movel" instead of that main: pushl %ebp movl %esp, %ebp andl $-16, %esp subl $16, %esp movl $3, 8(%esp) movl $2, 4(%esp) movl $1, (%esp) call a leave why does it happen? what's difference between them?

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• How to restore a slave from a mysql backup?

  - by robsf

  I'm running MySql 5.1. I have Master and a Slave on 2 machines and I set up replication. I do periodic backup on my slave server. I stop mysql, I copy all the files and I restart mysql. In case I lose the Master, I can set up a new one from the last backup. What If I lose the Slave? Can I restart the slave from the last backup? Am I supposed to keep track of the position of the replication every time I to a backup?

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• How to fork my android app?

  - by eidylon

  So I've written my first Android app, ... and want to be able to provide both free and paid versions. I wrote and compiled it in Eclipse on Windows. I'm wondering if it is possible, and how I would go about doing so, to have separate compile jobs somehow, so that I can maintain my free and paid versions from one set of source code, and just leave out certain bits for the paid version, but keep the main source the same. What are the recommended ways/best practices for devving a paid and free version of the same app from one set of source? Is it even possible?

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• In Xcode, the main controller is hopelessly misconfigured. What are the steps I can take to fix all

  - by MikeN

  Somehow the main .xib file for my iphone project got deleted. I created a replacement .xib file, but the properties are not setup correctly for the MainWindow to load this one. I don't understand and am hopelessly confused about any of the properties and which ones may or may not be sent. What are the X properties that all need to be set to have this work correctly? I've checked all of these, but there appear to be others: 1) The app delegate for the project is set to the new ControllerUI class. 2) The MainWindow.xib shows the correct .xib file as being loaded from (it has a link in its UI to the .xib file that should be loaded on project run. There appear to be other settings that have to be changed and I can't find them. Is there a way in XCode to recreate the MainWindow.xib file? Should I just create a new project and move all of the other files into it?

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• PHP MySQL query string

  - by user1174762

  I am newer to PHP and MySQL and I am having trouble understanding join. I think, for me, the problem lies with actually understanding the logic of the query. What I am trying to do Is select all of the status updates from a table named "post", but only ones from users I am "following", and then display them In order by date. So, I have two databases which are set up like so: posts |post_id|user_id|post_body|date_upload| | 1 | 4 | hey. | 01/2/2012 | follows |relation_id|user_id|followee_id| | 1 | 4 | 2 | Could someone please explain how I should syntactically and Logically set this up? Thank you!

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• Change macro in VisualStudio

  - by Vaccano

  The macro 'propdp' creates a dependency property like this: public int MyProperty { get { return (int)GetValue(MyPropertyProperty); } set { SetValue(MyPropertyProperty, value); } } // Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc... public static readonly DependencyProperty MyPropertyProperty = DependencyProperty.Register("MyProperty", typeof(int), typeof(ownerclass), new UIPropertyMetadata(0)); I would like to change it a bit. To look like this: public int MyProperty { get { return (int)GetValue(MyPropertyProperty); } set { SetValue(MyPropertyProperty, value); } } public static readonly DependencyProperty MyPropertyProperty = DependencyProperty.Register("MyProperty", typeof(int), typeof(ownerclass), new UIPropertyMetadata(0)); Can this be done? Does anyone know where to change this?

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• Removing rows from MySQL table where the timestamp is over one day old?

  - by Rob

  I found the exact same question here. But it isn't working for me. I've modified it a bit, manipulated it, and I can't figure it out. I'm trying to remove rows that are over a day old. Here is my code: if (isset($_POST['prune'])) { $sql = "DELETE FROM logs WHERE time < date('now', '-1 days')"; mysql_query($sql); echo 'Logs older than one day removed.'; } Fairly simple question I suppose, but its bugging the hell out of me. I would appreciate any help. In case it makes a difference, the column is a TIMESTAMP type.

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• Setting height of a DIV to correspond with location of anchor inside said DIV

  - by filip

  Core issue : http://jsfiddle.net/pipip/P46Xg/ I have a div container with a few paragraphs of text, and inside one of these paragraphs is the following anchor <a id="stop" /> The container is set to overflow:hidden Is it possible with javascript / JQuery to set the height of the container so that the bottom of the container stops exactly at or below the anchor? Added Depth & Background : http://jsfiddle.net/pipip/yj9dB/ This would be used for a modified JQuery Slider. Where someone using a CMS could type [readmore] anywhere into the Content field, which would be replaced by the above anchor via PHP. This way they would be easily able to control where the Read More break appears within the container. In the associated example I am hard-coding the height to 75px, although what I want is for the height to be dependent on the location of the anchor id="stop" in the text. Thanks. If this is an awful way to go about it, I'm all ears!

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• how to check whether there is a value exist for a filed in oracle

  - by nimo

  hi, How can I check whether there is a value set for a particular field in a table ? Thank You

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• What's the proper size of Default png's for iPad?

  - by David John

  I am confused by conflicting information. Most commonly I see these being the sizes quoted for the various Default images: Launch image Portrait Default-Portrait.png 768 x 1004 Launch image Portrait [email protected] 1536 x 2008 Launch image Landscape [email protected] 2048 x 1496 Launch image Landscape Default-Landscape.png 1024 x 748 Seemed like slightly unusual sizes, but I went along with it and dragged the images into the Launch images section in XCode. XCode however promptly puts little yellow triangles over these images and tell me that the sizes should be: 768x1024, 1536x2048, 1024x768 and 2048x1536 Oh and one last important bit. Do I really need to have all these images for submission to the app store? It's really not clear which images are required and which are just recommended. Mine is a Universal app btw if that makes any difference.

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• Jquery and DatePicker - change calendar by the date in the input field

  - by Y.G.J

  i have the value polled from the db and if the user want to change it - i want the calendar to be set first to the date already in the field

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• Generic arrays of parametrized ArrayLists in java?

  - by athena123

  I am new to Java, so I am not aware of the nitty gritties. Why can't I create generic array of parametrized ArrayList? Instead I have to write, ArrayList<String>[] alist = new ArrayList[10]; or I have to create List of ArrayLists. Aren't arrays supposed to be more efficient than ArrayLists? Then why doesn't Java allow it? Also, what is the difference between following two lines. ArrayList<String>[] alist = new ArrayList[10]; ArrayList<String>[] alist = new ArrayList<?>[10];

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• Interpreted vs. Compiled Languages for Web Sites (PHP, ASP, Perl, Python, etc.)

  - by Andrew Swift

  I build database-driven web sites. Previously I have used Perl or PHP with MySQL. Now I am starting a big new project, and I want to do it in the way that will result in the most responsive possible site. I have seen several pages here where questions about how to optimize PHP are criticized with various versions of "it's not worth going to great lengths to optimize PHP since it's an interpreted language and it won't make that much difference". I have also heard various discussions (especiallon on the SO podcast) about the benefits of compiled vs. interpreted languages, and it seems as though it would be in my interests to use a compiled language to serve up the site instead of an interpreted language. Is this even possible in a web context? If so, what would be a reasonable language choice? In addition to speed one benefit I forsee is the possiblity of finding bugs at compile time instead of having to debug the web site. Is this reasonable to expect?

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• Can you make a HTML element overflow-scroll ONLY vertically?

  - by John

  Is it possible to set a to add a scroll-bar vertically but clip horizontally?

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• "Method name expected" error when trying add a handler method to a delegate - C#

  - by zakplayyy

  I keep getting the error "Method name expected" when trying add the a method to a delegate. I have a delegate which is invoked when ever my game ends. The function I'm trying to add to the delegate stops a countdown from flashing (the method is in a static class). I've searched about and I'm still unsure why its not working. Here is the line causing the error: LivesManager.gameEnded += new LivesManager.EndGame(CountdownManager.DisableFlashTimer(this)); The this passes the current form to the method so it can disable the timer flash on the form. I have added methods from static classes to the same delegate before and it works fine, the only difference is that I'm passing the form as a paramater and then it doesn't like it. Is there any way to pass the form to the method without the error? Thanks in advance :)

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• Checking variable from a different class in C#

  - by Josh

  Greetings- I have 2 classes. One is called "Programs" and the other is called "Logs". The class called Programs has public const string m_sEnviron = ""; near the top and I need to check what the m_sEnviron variable is set to through my class called Logs. The variable m_sEnviron will get set from a scheduler called Tidal so how can I check its value from a different class. If this is not the best to do this then please let me know what the better ways are. Thanks in advance. Regards,

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