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• Optimizing MySQL queries with IN operator

  - by Arkadiusz Kondas

  I have a MySQL database with a fairly large table where the products are. Each of them has its own id and categoryId field where there is a category id belongs to this product. Now I have a query that pulls out products from given categories such as: SELECT * FROM products WHERE categoryId IN ( 1, 2, 3, 4, 5, 34, 6, 7, 8, 9, 10, 11, 12 ) Of course, come a WHERE clause and ORDER BY sort but not in this thing. Let's say that these products is 250k and the visits are over 100k per day. Under such conditions in the table slow_log registered weight of these queries with large generation time. Do you have any ideas how to optimize the given problem? Table engine is MyISAM.

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• 'Loading' web page for async call

  - by Sieg

  I have a simple web page in ASP.NET / C#. Currently to fully render the data I require calling a block of code that runs on background threads and can take multiple minutes to complete. I've got it to the point (using the async attribute on the page declaration) to execute and return fine with the html once it's done. What I'd like it to do is allow me to return immediately with a 'loading page' of some sort and then have that page be updated when the background work has been completed. Right now I get nothing on the page while the background work is being processed. Any ideas on the best way or clever way to do that would greatly be appreciated! Thanks, Sieg

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• How to enable ListView overscroll in HTC One X (may be all htc devices)?

  - by smeghead

  I have a listview in my app, and in my Xoom, and Galaxy S2, you get the normal glow effect when you overscroll. But in HTC One X, it doesn't show any overscroll behaviour. All the HTC apps have an accordion style overscroll behaviour. Do they use some custom listview? In any case, how do I show some sort of overscroll effect in HTC phones? Also, is there some ListView class out there, that implements overscroll effects on all phones (doesn't have to be the same effect). Some Context: The phones are on Android 4.0.3, and Xoom is on 4.0.4. The app is using the Holo Light theme. The min/target API level (as well as the Project API level) is set to 15.

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• How to know when a user console is locked or has logged "back into" windows

  - by Paul Kohler

  This is in regards to applications that run in the taskbar but should be applicable to standard apps, Winforms, WPF, etc. Question: I am after some method (preferably via managed code) to be notified when a user either has their screen "locked" while my app is running and/or know when they log back in. GMail Notifier does this sort of thing for example, if my PC is locked for a while when I log in again it shows a list of emails that arrived since locking the PC. I'm looking to replicate that kind of functionality. Does anyone have any ideas on how to accomplish this?

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• Java: How to store Vector<String[]> in XML (or save in any other way)

  - by hatboysam

  Basically I have a proof-of-concept application that is a digital recipe book. Each Recipe is an object and each object has, among other fields, a Vector containing arrays. The Vector is the list of all ingredients in the Recipe while each ingredient has an array showing the name of the ingredient, the amount, and the unit for that amount. I want to save each Recipe to XML so that they can be accessed by the user. How can I store a Vector of String arrays in XML or any other sort of file so that it can later be recalled and accessed?

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• does TFS easily allow you to share testresults with people who don't have TFS?

  - by jcollum

  I'd like to publish a set of test results to a place where team members who don't have TFS can see the results. Does TFS do anything like this easily? I see that that test results do get published, but without a TFS license I don't see any way for people to view them. I think I can do this easily by pulling the XML from the test results and then pushing that out to a central location, but I was wondering if there's anything like an "official" way to do this. TFS is hard to work with when you have some people who have access to it and others who don't... I really wish there was some sort of read-only access to the server (let people get files but not check them out for instance).

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• Best way to make a script to SSH?

  - by Paul

  My university has quite a lot files (like past papers etc) which I need to be on the uni network to access them. I ssh, using port forwarding, into the network and set my browser (Firefox) to go through that port. I know it would be quite easy to write something in most languages that would enter the command into a terminal, but which language/method could I use to make this happen? I expect some sort of scripting language could but I really know nothing about them, but I'd be willing to learn one just to have a little fun with this. I'm using a cygwin terminal on Windows 7, if that will make a difference. To neaten up my question: Which language would be best to acheive the above effect? Not necessarily the best, just possible and relatively simple to learn. I used the word best so I suppose I'll put a subjective tag.

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• How to find out where my memory is going

  - by the_mandrill

  I've got the situation where the cycle of loading and then closing a document eats up a few Mb of RAM. This memory isn't being leaked as something owns it and cleans it up when the app exits (Visual Leak Detector and the Mac Leaks tool show agreement on this). However, I'd like to find out where it's going. I'm assuming it's some sort of cache in the application that gets populated when the document loads but not freed when the document is closed. Which methods or tools could I use to find out where these allocations are being made?

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• How to make validation for a textbox that accept only comma(,) & digit in asp.net application?

  - by prateeksaluja20

  I am working on a website. I am using C# 2008. I want to make a text box that accept only numbers & comma(,). for example-919981424199,78848817711,47171111747 or there may be a single number like 919981424199. I was able to do one thing My text box only containing number by using this Regular Expression validation.in its property-Validation Expression i wrote "[0-9]+". This is working but now my requirement is to send bulk SMS & each number is separated by (,). I tried a lot but not getting the ans. so please help me to sort out this problem.

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• Custom Header Menu in Android App (How To)

  - by masterkrang

  I'm trying to implement a custom header menu in my Android application and I'm wondering what the standard or best practice for creating a header menu. I'm thinking something like the facebook app that displays a log and has some action items like triggering a search and possibly return back to the main activity. Tab Layout doesn't seem to be what I'm looking for. I found a tutorial here that might be close to what I'm looking for but not sure. It seems a bit redundant to instantiate a menu in every Activity. Seems like there would be a way to decouple the Activity from the menu, or at least more loosely couple it. Perhaps I need to implement something with Fragments but I'm sort of new, so I'm not sure yet. Looking forward to your suggestions or hearing how you've implemented something like this. Thanks!

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• List.clear() followed by List.add() not working.

  - by Vincent

  I have the following C# Class/Function: class Hand { private List<Card> myCards = new List<Card>(); public void sortBySuitValue() { IEnumerable<Card> query = from s in myCards orderby (int)s.suit, (int)s.value select s; myCards = new List<Card>(); myCards.AddRange(query); } } On a card Game. This works fine, however, I had trouble at first, instead of using myCards = new List(); to 'reset' myCards, I would use myCards.clear(), however, once I called the clear function, I would not be able to call myCards.add() or myCards.addRange(). The count would stay at zero. Is my current approach good? Is using LINQ to sort my cards good/bad?

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• Elegant ways of displaying a GridView with lots of columns (ASP.NET)

  - by Chris

  Hi, just a general design question that I'd like to hear some of your opinions on. I am designing a system for a client, and I'm using GridView' a lot. They need a lot of columns to be displayed in some of these, and I've had to resort to using a panel with a horizontal scrollbar. This presents some issues - keeping track of which row is which is difficult, even with alternating row colours, and it's generally pretty ugly. How have you dealt with these issues before? Are there any sort of AJAX controls that could help, so some data could be only displayed on hover or such? Or any other general ideas.

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• Best practices for storing & selecting time/date with php & mysql?

  - by Adam

  I often find myself storing data in a mysql database, and then wanting to display all sorts of stats about my data, specifically stuff like 'how many rows do I have for this date, or that date'. Does anyone know of (or could write) a good tutorial on this subject? Ideally a good tutorial would overview: Best practices when storing the data (i.e. what formats to use, how to use them servertime vs. generated time, etc.) Best practices when selecting data from the database with php (i.e. how to sort rows by date, how to retrieve only rows from a certain date, or a certain hour, etc).. Timezones and other issues that might come up. Thanks in advance.

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• Working with sets of rows in (My)SQL and comparing values

  - by Pep.

  Hello, I am trying to figure out the SQL for doing some relatively simple operations on sets of records in a table but I am stuck. Consider a table with multiple rows per item, all identified by a common key. For example: serial model color XX1 A blue XX2 A blue XX3 A green XX5 B red XX6 B blue XX1 B blue What I would for example want to do is: Assuming that all model A rows must have the same color, find the rows which dont. (for example, XX3 is green). Assuming that a given serial number can only point to a single type of model, find out the rows which that does not occur (for example XX1 points both to A and B) These are all simple logically things to do. To abstract it, I want to know how to group things by using a single key (or combination of keys) and then compare the values of those records. Should I use a join on the same table? should i use some sort of array or similar? thanks for your help

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• building a hash lookup table during `git filter-branch` or `git-rebase`

  - by intuited

  I've been using the SHA1 hashes of my commits as references in documentation, etc. I've realized that if I need to rewrite those commits, I'll need to create a lookup table to correspond the hashes for the original repo with the hashes for the filtered repo. Since these are effectively UUID's, a simple lookup table would do. I think that it's relatively straightforward to write a script to do this during a filter-branch run; that's not really my question, though if there are some gotchas that make it complicated, I'd certainly like to hear about them. I'm really wondering if there are any tools that provide this functionality, or if there is some sort of convention on where to keep the lookup table/what to call it? I'd prefer not to do things in a completely idiosyncratic way.

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• Object directing to a property when accessed as an iterable

  - by ThE_JacO

  I'm trying to figure out if there's an elegant and concise way to have a class accessing one of its own properties when "used" as a dictionary, basically redirecting all the methods that'd be implemented in an ordered dictionary to one of its properties. Currently I'm inheriting from IterableUserDict and explicitly setting its data to another property, and it seems to be working, but I know that UserDict is considered sort of old, and I'm concerned I might be overlooking something. What I have: class ConnectionInterface(IterableUserDict): def __init__(self, hostObject): self._hostObject= hostObject self.ports= odict.OrderedDict() self.inputPorts= odict.OrderedDict() self.outputPorts= odict.OrderedDict() self.data= self.ports This way I expect the object to behave and respond (and be used) the way I mean it to, except I want to get a freebie ordered dictionary behaviour on its property "ports" when it's iterated, items are gotten by key, something is looked up ala if this in myObject, and so on. Any advice welcome, the above seems to be working fine, but I have an odd itch that I might be missing something. Thanks in advance.

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• Is it possible to get the current request that is being served by node.js?

  - by user420504

  I am using express.js. I have a need to be able to log certain request data whenever someone tries to log a message. For this I would like to create a helper method like so function log_message(level, message){ winston.log(level, req.path + "" + message); } I would then use the method like so. exports.index = function(req, res){ log_message("info", "I'm here"); } Note that I am not passing the req object to the log_message function. I want that to be transparently done so that the log_message API user does not need to be aware of the common data that is being logged. Is there a way to achieve this with express.js/node.js. Is the request object available from a global variable of some sort?

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• Using Option all over the place feels a bit awkward. Am I doing something wrong?

  - by Geo

  As a result of articles I read about the Option class which helps you avoid NullPointerException's, I started to use it all over the place. Imagine something like this: var file:Option[File] = None and later when I use it: val actualFile = file.getOrElse(new File("nonexisting")) if(actualFile.getName.equals("nonexisting")) { // instead of null checking } else { // value of file was good } Doing stuff like this doesn't feel all that "right" to me. I also noticed that .get has become deprecated. . Is this sort of stuff what you guys are doing with Option's too, or am I going the wrong way?

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• How do I get the output from a Perl pipe as it becomes available?

  - by Uri

  The following code is working sort of fine: open( PIPE, '-|', 'ant' ); for( <PIPE> ) { print; } However, it doesn't do what I want. Since the Ant build can take 5 minutes, I would like to see the output line by line. Instead, I'm getting the entire input at the end of the process. Looking at it with the Perl debugger, Perl waits at the 'for' statement, until Ant terminates. Why is that?

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• Hibernate HQL to basic SQL (no joins)

  - by CC

  Hello everybody, I working on a project with Hibernate and we need to replace Hibernate with some "home made persistence" stuff. The idea is that the project is big enough, and we have many HQL queries. The problem is with the queries like select a,b from table1, table2 on t1.table1=t2.table2 Basically all joins are not supported by our "hand made persistence" stuff. What I would need, is to be able to do some sort of transcoder, which will take as a input the HQL queries and output some SQL, but SQL without joins I hope you get the idea. My persistence layer does not supports joins. Does anybody has any idea about something like that? Some framework, or something? Thanks alot everybody. C.C.

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• Incremental Union?

  - by cam

  I'm trying to describe a Sudoku Board in C++ with a union statement: union Board { int board[9][9]; int sec1[3][3]; int sec2[3][3]; int sec3[3][3]; int sec4[3][3]; int sec5[3][3]; int sec6[3][3]; int sec7[3][3]; int sec8[3][3]; int sec9[3][3]; } Would each section of the board correspond with the correct part of the array? IE, Would sec4 correspond with board[4-6][0-3]? Is there a better way to do this sort of thing (specifically describing a sudoku board)?

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• Advanced Memory Editing/Function Calling

  - by Saustin

  Hi, I've gotten extremely interested into coding trainers (Program that modifies value of a different process) for video games. I've done the simple 'god-mode' and 'unlimited money' things, but I want to do alot more than that. (Simple editing using WriteProcessMemory) There are memory addresses of functions on the internet of the video game I'm working on, and one of functions is like "CreateCar" and I'm wanting to call that function from an external program. My question: How can I call a function from an external process in C/C++, provided the function address, using a process handle or other method. PS: If anyone could link me to tools (I've got debuggers, no need for more..) that help with this sort of thing, that'd be nice.

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• [Android] How to launch an Activity without a UI?

  - by fjmustak

  Is it in any way possible to launch an activity from the main function without having a UI? i.e. is there a way to create a sort of "wrapper" around another activity, i.e. by launching the main activity, it takes you to another activity automatically. If that is not possible, is there a way to remove the main activity from the stack so that clicking the back button does not take you to a blank UI? Here's an example of what I'm trying to do: public class WrapperActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:555-1212")); startActivity(intent); } }

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• Is there a tool to discover if the same class exists in multiple jars in the classpath?

  - by David Citron

  If you have two jars in your classpath that contain different versions of the same class, the classpath order becomes critical. I am looking for a tool that can detect and flag such potential conflicts in a given classpath or set of folders. Certainly a script that starts: classes=`mktemp` for i in `find . -name "*.jar"` do echo "File: $i" > $classes jar tf $i > $classes ... done with some clever sort/uniq/diff/grep/awk later on has potential, but I was wondering if anyone knows of any existing solutions.

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• Which route should i take for web hosting?

  - by Undermine2k

  Hi I am setting up a small website sort of like an online portfolio. I made the mistake of signing up for shared-web hosting before asking if they supported stored procedures which took me half the day to figure out they didn't. Basically i'm looking for a site that offers me PHP5.4+/ Mysql 5.5 + with support for triggers/stored procedures/ and if possible MyphpAdmin 3.5.1. I also have a domain name I already registered and which I would like to use. What is my best option to look for hosting provider which offers this functionality or to setup a VPS?

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