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• Find and replace string in MySQL using data from another table

  - by Charlie

  Hi, sorry for formatting this wonky but hope you can understand it. I have two MySql tables, and I want to find and replace text strings in one using data in another. Texts - one column: messages 'thx guys' 'i think u r great' 'thx again' ' u rock' Dictionary - two columns: bad_spelling, good_spelling 'thx' 'thanks' ' u ' ' you ' ' r ' ' are ' I want SQL to go through and look at every row in messages and replace every instance of bad_spelling with good_spelling, and to do this for all the pairs of bad_spelling and good_spelling The closest I have gotten is this: update texts, dictionary set texts.message = replace(texts.message, dictionary.bad_spelling, dictionary.good_spelling) But this only changes 'thx' to 'thanks' (in 2 rows) and does not go on to replace ' u ' with ' you' or ' r ' with ' are '. Any ideas how to make it use all the rows in dictionary in the replace statement? -- PS forgot to mention that this is a small example and in the real thing I will have a lot of find/replace pairs, which may get added to over time.

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• Changing error message for datatype validation?

  - by Matthias

  Hey guys, I've a small question on ASP.NET MVC 2. I'm using Data Annotations on my Presentation Model and its model binder per default. But one step back, I want to do the most elementary thing: validation of the data type. Let's say I have an "int ID" on my model and want to edit the according entity in my view. If I enter something wrong like "foo", then I get a model error back, but the validation message is on English. I want to have this message in other languages, too. How can I do this? I remember that in MVC 1 I've written a custom model binder which checks the data types, but that's not what I want to do (at least not in MVC 2). Thus I hope there is a better way... Thanks, Matthias

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• Best Java 'framework' for LOW-END 3D Graphics?

  - by CodeJustin.com

  I've made my share of 2D games on various platforms but I have never developed a 3D game. I want to make a small "mmorpg". I already made my server in python and it works just fine with my flash 2D game but I decided I want to step it up and try out 3D. I want to make a 3D game for the web browser and I think Java might be a good choice for this. So basically I'm just looking for a straight forward and well documents 'framework' to make LOW-END 3D games. Keep in mind that I will be targeting peoples with very low-end PC's (plus my 3d modeling skills aren't great so I wouldn't mind hiding it somewhat, haha)

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• Facebook Developer Toolkit doesn't redirect after authorization

  - by Mika Kolari

  I have a small facebook test app (iframe) based on sample http://blogs.claritycon.com/blogs/kevin_marshall/archive/2009/10/06/facebook-developer-toolkit-3-0-asp-net-mvc-sample.aspx public class HomeController : Controller { public ActionResult Index() { var api = this.GetApi(); var userId = api.Session.UserId; return View(); } // redirects to Index // which doesn't redirect back here [FacebookAuthorization(IsFbml = false)] public ActionResult About() { var api = this.GetApi(); // goes here without FacebookAuthorization // but userId = 0 var userId = api.Session.UserId; return View(); } } When I try to go to 'About' page, FacebookAuthorizationAttribute redirects to 'Index' for authentication. The problem is, it never redirects back to 'About'. What am I doing wrong here?

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• Testing a command from Perl and checking content of a file

  - by justintime

  I want to test a script I have written in Perl and specifically check what output it writes to file. I wrote it some time ago and don't want to modify it to the extent of turning it into a module but would like to regression test it before adding some small functional changes. So far I have use Test::Command tests = 10; exit_is_num($cmd, 0); .... But the command produces some files and I want to check those files are the same as I expect (either equal or match some regexp). Any suggestions

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• Git under windows: MSYS or Cygwin?

  - by Joce

  I plan to migrate my projects over to git, and I'm currently wondering which is the best and / or most stable option under windows. From what I gather I basically have 2.5 options: MSYSgit git under Cygwin (aka 2.5) MSYSgit from a Cygwin prompt (given that Cygwin git is already installed). Note: IMO Cygwin in itself is a big plus as you can have access to pretty much all the *nix command line tools, as where with MSYSgit bash, you only have access to a rather small subset of these tools. Given that, what option would you suggest?

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• Question about WinForms TrackBar control in .Net

  - by Jules

  Does anyone know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse? I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects. I've had a look in reflector but it's one of those controls where most of the implementation is not viewable. ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this? Thanks

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• Troubleshooting latency spikes on ESXi NFS datastores

  - by exo_cw

  I'm experiencing fsync latencies of around five seconds on NFS datastores in ESXi, triggered by certain VMs. I suspect this might be caused by VMs using NCQ/TCQ, as this does not happen with virtual IDE drives. This can be reproduced using fsync-tester (by Ted Ts'o) and ioping. For example using a Grml live system with a 8GB disk: Linux 2.6.33-grml64: root@dynip211 /mnt/sda # ./fsync-tester fsync time: 5.0391 fsync time: 5.0438 fsync time: 5.0300 fsync time: 0.0231 fsync time: 0.0243 fsync time: 5.0382 fsync time: 5.0400 [... goes on like this ...] That is 5 seconds, not milliseconds. This is even creating IO-latencies on a different VM running on the same host and datastore: root@grml /mnt/sda/ioping-0.5 # ./ioping -i 0.3 -p 20 . 4096 bytes from . (reiserfs /dev/sda): request=1 time=7.2 ms 4096 bytes from . (reiserfs /dev/sda): request=2 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=3 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=4 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=5 time=4809.0 ms 4096 bytes from . (reiserfs /dev/sda): request=6 time=1.0 ms 4096 bytes from . (reiserfs /dev/sda): request=7 time=1.2 ms 4096 bytes from . (reiserfs /dev/sda): request=8 time=1.1 ms 4096 bytes from . (reiserfs /dev/sda): request=9 time=1.3 ms 4096 bytes from . (reiserfs /dev/sda): request=10 time=1.2 ms 4096 bytes from . (reiserfs /dev/sda): request=11 time=1.0 ms 4096 bytes from . (reiserfs /dev/sda): request=12 time=4950.0 ms When I move the first VM to local storage it looks perfectly normal: root@dynip211 /mnt/sda # ./fsync-tester fsync time: 0.0191 fsync time: 0.0201 fsync time: 0.0203 fsync time: 0.0206 fsync time: 0.0192 fsync time: 0.0231 fsync time: 0.0201 [... tried that for one hour: no spike ...] Things I've tried that made no difference: Tested several ESXi Builds: 381591, 348481, 260247 Tested on different hardware, different Intel and AMD boxes Tested with different NFS servers, all show the same behavior: OpenIndiana b147 (ZFS sync always or disabled: no difference) OpenIndiana b148 (ZFS sync always or disabled: no difference) Linux 2.6.32 (sync or async: no difference) It makes no difference if the NFS server is on the same machine (as a virtual storage appliance) or on a different host Guest OS tested, showing problems: Windows 7 64 Bit (using CrystalDiskMark, latency spikes happen mostly during preparing phase) Linux 2.6.32 (fsync-tester + ioping) Linux 2.6.38 (fsync-tester + ioping) I could not reproduce this problem on Linux 2.6.18 VMs. Another workaround is to use virtual IDE disks (vs SCSI/SAS), but that is limiting performance and the number of drives per VM. Update 2011-06-30: The latency spikes seem to happen more often if the application writes in multiple small blocks before fsync. For example fsync-tester does this (strace output): pwrite(3, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"..., 1048576, 0) = 1048576 fsync(3) = 0 ioping does this while preparing the file: [lots of pwrites] pwrite(3, "********************************"..., 4096, 1036288) = 4096 pwrite(3, "********************************"..., 4096, 1040384) = 4096 pwrite(3, "********************************"..., 4096, 1044480) = 4096 fsync(3) = 0 The setup phase of ioping almost always hangs, while fsync-tester sometimes works fine. Is someone capable of updating fsync-tester to write multiple small blocks? My C skills suck ;) Update 2011-07-02: This problem does not occur with iSCSI. I tried this with the OpenIndiana COMSTAR iSCSI server. But iSCSI does not give you easy access to the VMDK files so you can move them between hosts with snapshots and rsync. Update 2011-07-06: This is part of a wireshark capture, captured by a third VM on the same vSwitch. This all happens on the same host, no physical network involved. I've started ioping around time 20. There were no packets sent until the five second delay was over: No. Time Source Destination Protocol Info 1082 16.164096 192.168.250.10 192.168.250.20 NFS V3 WRITE Call (Reply In 1085), FH:0x3eb56466 Offset:0 Len:84 FILE_SYNC 1083 16.164112 192.168.250.10 192.168.250.20 NFS V3 WRITE Call (Reply In 1086), FH:0x3eb56f66 Offset:0 Len:84 FILE_SYNC 1084 16.166060 192.168.250.20 192.168.250.10 TCP nfs > iclcnet-locate [ACK] Seq=445 Ack=1057 Win=32806 Len=0 TSV=432016 TSER=769110 1085 16.167678 192.168.250.20 192.168.250.10 NFS V3 WRITE Reply (Call In 1082) Len:84 FILE_SYNC 1086 16.168280 192.168.250.20 192.168.250.10 NFS V3 WRITE Reply (Call In 1083) Len:84 FILE_SYNC 1087 16.168417 192.168.250.10 192.168.250.20 TCP iclcnet-locate > nfs [ACK] Seq=1057 Ack=773 Win=4163 Len=0 TSV=769110 TSER=432016 1088 23.163028 192.168.250.10 192.168.250.20 NFS V3 GETATTR Call (Reply In 1089), FH:0x0bb04963 1089 23.164541 192.168.250.20 192.168.250.10 NFS V3 GETATTR Reply (Call In 1088) Directory mode:0777 uid:0 gid:0 1090 23.274252 192.168.250.10 192.168.250.20 TCP iclcnet-locate > nfs [ACK] Seq=1185 Ack=889 Win=4163 Len=0 TSV=769821 TSER=432716 1091 24.924188 192.168.250.10 192.168.250.20 RPC Continuation 1092 24.924210 192.168.250.10 192.168.250.20 RPC Continuation 1093 24.924216 192.168.250.10 192.168.250.20 RPC Continuation 1094 24.924225 192.168.250.10 192.168.250.20 RPC Continuation 1095 24.924555 192.168.250.20 192.168.250.10 TCP nfs > iclcnet_svinfo [ACK] Seq=6893 Ack=1118613 Win=32625 Len=0 TSV=432892 TSER=769986 1096 24.924626 192.168.250.10 192.168.250.20 RPC Continuation 1097 24.924635 192.168.250.10 192.168.250.20 RPC Continuation 1098 24.924643 192.168.250.10 192.168.250.20 RPC Continuation 1099 24.924649 192.168.250.10 192.168.250.20 RPC Continuation 1100 24.924653 192.168.250.10 192.168.250.20 RPC Continuation 2nd Update 2011-07-06: There seems to be some influence from TCP window sizes. I was not able to reproduce this problem using FreeNAS (based on FreeBSD) as a NFS server. The wireshark captures showed TCP window updates to 29127 bytes in regular intervals. I did not see them with OpenIndiana, which uses larger window sizes by default. I can no longer reproduce this problem if I set the following options in OpenIndiana and restart the NFS server: ndd -set /dev/tcp tcp_recv_hiwat 8192 # default is 128000 ndd -set /dev/tcp tcp_max_buf 1048575 # default is 1048576 But this kills performance: Writing from /dev/zero to a file with dd_rescue goes from 170MB/s to 80MB/s. Update 2011-07-07: I've uploaded this tcpdump capture (can be analyzed with wireshark). In this case 192.168.250.2 is the NFS server (OpenIndiana b148) and 192.168.250.10 is the ESXi host. Things I've tested during this capture: Started "ioping -w 5 -i 0.2 ." at time 30, 5 second hang in setup, completed at time 40. Started "ioping -w 5 -i 0.2 ." at time 60, 5 second hang in setup, completed at time 70. Started "fsync-tester" at time 90, with the following output, stopped at time 120: fsync time: 0.0248 fsync time: 5.0197 fsync time: 5.0287 fsync time: 5.0242 fsync time: 5.0225 fsync time: 0.0209 2nd Update 2011-07-07: Tested another NFS server VM, this time NexentaStor 3.0.5 community edition: Shows the same problems. Update 2011-07-31: I can also reproduce this problem on the new ESXi build 4.1.0.433742.

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• Touch area changing on custom UIButton with image and title on landscape mode

  - by gkedmi

  hello all I'm trying to build a button that looks like the icons on the iphone , with an image and a title bellow.I'm working in landscape mode. I have a custom button on the IB with image and title and inside the code I use the methods : [aButton setTitleEdgeInsets:UIEdgeInsetsMake(60.0, -50.0, 0.0, 0.0)]; [aButton setImageEdgeInsets:UIEdgeInsetsMake(-10.0, 29.0, 0.0, 0.0)]; my problem is that the area that react to the touch events is very small and is on the top left of the button , another problem is that if I change my button size I have to calculate again manually the values for these 2 functions. Is there any easy way to do it?and if not how can I fix the touch area? thanks Gilad

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• How can I enjoy or avoid designing every web application I make ?

  - by schmrz

  I know this sounds silly, but I'm having huge problems (ok, not that huge, but still...) problems when I get an idea for a web project, small or big. The instant turn off is when I remember that I have to code the html/css by hand again and again. I like programming a lot more that designing web sites, and I simply don't enjoy designing them as much as I enjoy programming them. With that said, I also prefer simple and minimalistic designs. What is your approach in web design, how do you make it enjoyable (at least a little bit)?

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• Should i really use integer primary IDs?

  - by arthurprs

  For example, i always generate an auto-increment field for the users table, but i also specifies an UNIQUE index on their usernames. There is situations that i first need to get the userId for a given username and then execute the desired query. Or use a JOIN in the desired query. It's 2 trips to the database or a JOIN vs. a varchar index The above is just an example There is a real performance benefit on INT over small VARCHAR indexes? Thanks in advance!

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• SQL Server - Schema/Code Analysis Rules - What would your rules include?

  - by Randy Minder

  We're using Visual Studio Database Edition (DBPro) to manage our schema. This is a great tool that, among the many things it can do, can analyse our schema and T-SQL code based on rules (much like what FxCop does with C# code), and flag certain things as warnings and errors. Some example rules might be that every table must have a primary key, no underscore's in column names, every stored procedure must have comments etc. The number of rules built into DBPro is fairly small, and a bit odd. Fortunately DBPro has an API that allows the developer to create their own. I'm curious as to the types of rules you and your DB team would create (both schema rules and T-SQL rules). Looking at some of your rules might help us decide what we should consider. Thanks - Randy

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• WPF Embedded Database Application

  - by testerws

  Hello everyone, im new with wpf and want to make a small Application with the embedded (local) database in WPF. Im using VS08, -add new file - local Database, so far so good. I also can add a table (test table called Person with Name and Age), this works good. And now comes my problem, could anyone tell me how to make (select... insert) statements in codebehind, so that i could display them in a datagrid (from wpftoolkit). Need some code or step by step tut. :D

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• Matrix inversion in OpenCL

  - by buchtak

  Hi, I am trying to accelerate some computations using OpenCL and part of the algorithm consists of inverting a matrix. Is there any open-source library or freely available code to compute lu factorization (lapack dgetrf and dgetri) of matrix or general inversion written in OpenCL or CUDA? The matrix is real and square but doesn't have any other special properties besides that. So far, I've managed to find only basic blas matrix-vector operations implementations on gpu. The matrix is rather small, only about 60-100 rows and cols, so it could be computed faster on cpu, but it's used kinda in the middle of the algorithm, so I would have to transfer it to host, calculate the inverse, and then transfer the result back on the device where it's then used in much larger computations.

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• Test Application Guide for Winforms

  - by Jonathan

  I'm a c# developer in a medium/small company. I use to do quick test of the apps that my workmates made and they use to test my applications. We test each form based in our experience. (yes, I know this is not a very formal method) Now a new guy without experience are going to join our team. We think now is the momento to make a little list of things that all we should test in each form. Divided by categories. For example usability: Test that the taborder of each control are properly setted, or Valitacion: Test that the max lenght of each textbox match with the max lenght of a field in the DB...etc We don't one to Reinvent the Wheels, so I want to know if such kind of document already exists. Thanks

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• Translate google co-ordinates to the pixels on picture.

  - by kalininew

  I have a city "map" (for example - Moscow). She in accuracy repeats the contours the given city in google maps (that is it is copied from google maps and it is a little processed, but the sense remained the same). Also I have object co-ordinates in a city (in co-ordinates of google). Problem: how to translate google co-ordinates to the co-ordinates of my picture (that is in pixels on OX and OY on a picture). That is I receive google-co-ordinates and it is necessary for me to draw this point on my picture. I know that on small scales (for example on city scales) it to make simply enough (it is necessary to learn what google-co-ordinates has one of picture corners, then to learn "price" of one pixel in google-co-ordinates on a picture on axes OX and OY separately). But on the big scales (country scale) "price" of one pixel will be not a constant, and will vary strongly enough and the method described above cannot be applied. How to solve a problem on country scales?

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• Detecting your application's install path in Java?

  - by Danny King

  Hi, I have made a small application in Java and I would like to make a windows installer for it using the Nullsoft Scriptable Install System (http://nsis.sourceforge.net/Main_Page). The application I made needs to save user preferences somewhere and it currently saves it in the user's home directory (e.g. c:\Users\danny or /home/users/danny). However if the windows installer installs the application to e.g. c:\Program Files\whatever\ I should probably save the preferences file there too, right? How would I detect that directory path in Java? What would be a good cross-platform approach to this without losing the benefits of a windows uninstaller for windows users e.g. start menu icons, installer option, etc? Should I just continue saving my preferences in the user's home path and clutter it up? Thanks very much,

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• Floating point arithmetic is too reliable.

  - by mcoolbeth

  I understand that floating point arithmetic as performed in modern computer systems is not always consistent with real arithmetic. I am trying to contrive a small C# program to demonstrate this. eg: static void Main(string[] args) { double x = 0, y = 0; x += 20013.8; x += 20012.7; y += 10016.4; y += 30010.1; Console.WriteLine("Result: "+ x + " " + y + " " + (x==y)); Console.Write("Press any key to continue . . . "); Console.ReadKey(true); } However, in this case, x and y are equal in the end. Is it possible for me to demonstrate the inconsistency of floating point arithmetic using a program of similar complexity, and without using any really crazy numbers? I would like, if possible, to avoid mathematically correct values that go more than a few places beyond the decimal point.

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• Mercurial Pull Error

  - by Tyler

  I am new to the dvcs world. My company uses perforce and I'm not a fan so I thought I'd try to use mercurial as a front end. I set it up on a windows machine with TortiseHG, enabled the Perfarce extension, did a small checkout (limiting the target revision) and pulled for the rest. This seemed to be more robust than clone alone. This seems to be working fairly well as I've been able to get up to change 8700 or so. My problem is with an error in the perforce repo. During the hg pull command it hits an error abort: file path/to/file.pl missing in p4 workspace and rolls back the transaction. Is there anyway to bypass or skip that file and force it to continue since this is not a file I care about.

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• Best practices for developing bigger applications on Android

  - by Janusz

  I've already written some small Android Applications, most of them in one Activity and nearly no data that should be persistent on the device. Now I'm writing an application that needs more Activities and I'm a bit puzzled about how to organize all this. My app will download some data parse it show it to the user and then show other activities depending on the data and the user interaction. Some of that data could be cached, some of it has to be downloaded every time. Some of that data should not be downloaded freshly at the moment the orientation changes, but it should on the moment the activity is created... Another thing I'm confused about are things like a httpClient. I now for example create a new httpclient for every activity, the same thing for locationlisteners. Are there books, a blogs or documentations with patterns, examples and advice on organizing larger apps build on android? Everything I found until now are get startet tutorials leaving me alone after 60 lines of code...

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• BlackBerry - Error preverifying class java during build

  - by Davide Vosti

  I'm trying do build and debug a small project for BlackBerry. During the build I'm getting this error Error preverifying class java ... I read on the net this error could be caused by referencing multiple projects but I tried to move every package in a single project but the error is still there. I tried with multiple JDE version (currently 4.7) and the Java compiler is set to 1.6. Eclipse version is 3.4.1 as recommended by RIM's documentations. Does someone have some clue?

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• WCF Paged Results & Data Export

  - by Ben

  I've walked into a project that is using a WCF service for the data tier. Currently, when data is needed for a grid, all rows are returned and the results are bound to a grid and the dataset is stuffed into a session variable for paging/sorting/rebinding. We've already hit a max message size problem, so I'm thinking it's time to convert from fetch and cache to fetch only the current page. Face value this seems easy enough, but there's a small catch. The user is allowed to export the entire result set at any point. This means that for grid viewing purposes fetching the current page is fine, but when they want to do an export, I still need to make a call for all data. This puts me back into the max message size issue. What is the recommended approach for this type of setup? We are currently using the wsHttpBinding... Thanks for any assistance.

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• Windows API - Beginner help

  - by nXqd

  I try to create a very simple app using windows API. I've done some small apps in console. This is the first time I do with Win32 apps. I've searched and found a document from forgers which is recommended in this site. But I try to write very first line: #include <stdafx.h> #include <windows.h> int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MessageBoxW (NULL, "Good bye Cruel World", "Note", MB_OK ); return 0; } But it doesn't work ( erased lines from default project created by VS 2008 and write these lines ) Waiting for your answers :)

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• XML url link in Flash

  - by Vickyboy

  Hi, I am new to XML and am having a small problem in Flash. I have a number of buttons. Each of these buttons need to open up a different URL which is in a xml file (I have added only one button for now (banstead), as I wasn´t sure how to add more). My XML: <?xml version="1.0" encoding="utf-8"?> <banstead targ="_self" href="http://www.marca.com"> </banstead> My AS: weblinkXML = new XML(); weblinkXML.ignoreWhite = true; weblinkXML.load("xml/counties.xml"); weblinkXML.onLoad = function (success) { var url = weblinkXML.firstChild.attributes.href; banstead.onRelease = function () { getURL(weblinkXML.url); } } For some reason when I test the movie and click on the button it doesn´t open the URL I requested. Appreciate any help

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• Generate HTML To PDF Control for the .NET application

  - by Karan

  Has anyone used any open source or paid .NET Control which does the conversion job from html to pdf file? At the moment, i am using Winnovative convertor control. But it has a performance limitation during the generation of bulk pages (like more than 1000) in the pdf. The limitation comes when we use bigger images in the html content. From last 4 months i've been working on the winnovative control and found plenty of major bugs in it. For a small application and usage. winnovative is good but not for the level where application will be used by thousands of clients. Please suggest.

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