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• SQL Server architecture guidance

  - by Liam

  Hi, We are designing a new version of our existing product on a new schema. Its an internal web application with possibly 100 concurrent users (max)This will run on a SQL Server 2008 database. On of the discussion items recently is whether we should have a single database of split the database for performance reasons across 2 separate databases. The database could grow anywhere from 50-100GB over 5 years. We are Developers and not DBAs so it would be nice to get some general guidance. [I know the answer is not simple as it depends on the schema, archiving policy, amount of data etc. ] Option 1 Single Main Database [This is my preferred option]. The plan would be to have all the tables in a single database and possibly to use file groups and partitioning to separate the data if required across multiple disks. [Use schema if appropriate]. This should deal with the performance concerns One of the comments wrt this was that the a single server instance would still be processing this data so there would still be a processing bottle neck. For reporting we could have a separate reporting DB but this is still being discussed. Option 2 Split the database into 2 separate databases DB1 - Customers, Accounts, Customer resources etc DB2 - This would contain the bulk of the data [i.e. Vehicle tracking data, financial transaction tables etc]. These tables would typically contain a lot of data. [It could reside on a separate server if required] This plan would involve keeping the main data in a smaller database [DB1] and retaining the [mainly] read only transaction type data in a separate DB [DB2]. The UI would mainly read from DB1 and thus be more responsive. [I'm aware that this option makes it harder for Referential Integrity to be enforced.] Points for consideration As we are at the design stage we can at least make proper use of indexes to deal performance issues so thats why option 1 to me is attractive and its more of a standard approach. For both options we are considering implementing an archiving database. Apologies for the long Question. In summary the question is 1 DB or 2? Thanks in advance, Liam

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• Flex Air HTMLLoader blank pop up window when flash content is loaded

  - by user128938

  I have a flex Air program that loads external content with the HTMLLoader. Now for some reason whenever I load a page that has any flash content a blank system window pops up outside of my program. It's completely blank, all white with min, max and close buttons. If I close it any flash content I loaded stops working. For the life of my I can't figure out what's happening and there's no messages in the console and no title for the window. Does anyone have any ideas? I appreciate any help you can give. Here's the code I'm using: private var webPage:HTMLLoader; private function registerEvents():void { this.addEventListener(gameLoadEvent.GAME_LOAD, gameLoad); //webPage = new HTMLLoader(); } //function called back from Game Command to load correct game private function gameLoad(event:Event):void { var gameEvent:gameLoadEvent = event as gameLoadEvent; loadgame(gameEvent.url, gameEvent.variables); } private function loadgame(url:String, variableString:String):void { DesktopModelLocator.getInstance().scaleX = 1; DesktopModelLocator.getInstance().scaleY = 1; //var url:String = "http://pro-us.sbt-corp.com/aspx/member/LaunchGame.aspx"; var request:URLRequest = new URLRequest(url); //var variables:URLVariables = new URLVariables("gameNum=17&as=as1&t=demo&package=a&btnQuit=0"); if(variableString != null && variableString != ""){ var variables:URLVariables = new URLVariables(variableString); variables.exampleSessionId = new Date().getTime(); variables.exampleUserLabel = "guest"; request.data = variables; } webPage = HTMLLoader.createRootWindow(true, null, true, null); webPage.height = systemManager.stage.nativeWindow.height - 66; webPage.width = systemManager.stage.nativeWindow.width; webPage.load(request); webPage.navigateInSystemBrowser = false; flexBrowser.addChild(webPage); } ]]> </mx:Script> <mx:HTML id="flexBrowser" width="1366" height="658" backgroundAlpha="0.45" creationComplete="registerEvents();" x="0" y="0"> </mx:HTML>

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• stxxl Assertion `it != root_node_.end()' failed

  - by Fabrizio Silvestri

  I am receiving this assertion failed error when trying to insert an element in a stxxl map. The entire assertion error is the following: resCache: /usr/include/stxxl/bits/containers/btree/btree.h:470: std::pair , bool stxxl::btree::btree::insert(const value_type&) [with KeyType = e_my_key, DataType = unsigned int, CompareType = comp_type, unsigned int RawNodeSize = 16384u, unsigned int RawLeafSize = 131072u, PDAllocStrategy = stxxl::SR, stxxl::btree::btree::value_type = std::pair]: Assertion `it != root_node_.end()' failed. Aborted Any idea? Edit: Here's the code fragment void request_handler::handle_request(my_key& query, reply& rep) { c_++; strip(query.content); std::cout << "Received query " << query.content << " by thread " << boost::this_thread::get_id() << ". It is number " << c_ << "\n"; strcpy(element.first.content, query.content); element.second = c_; testcache_.insert(element); STXXL_MSG("Records in map: " << testcache_.size()); } Edit2 here's more details (I omit constants, e.g. MAX_QUERY_LEN) struct comp_type : std::binary_function<my_key, my_key, bool> { bool operator () (const my_key & a, const my_key & b) const { return strncmp(a.content, b.content, MAX_QUERY_LEN) < 0; } static my_key max_value() { return max_key; } static my_key min_value() { return min_key; } }; typedef stxxl::map<my_key, my_data, comp_type> cacheType; cacheType testcache_; request_handler::request_handler() :testcache_(NODE_CACHE_SIZE, LEAF_CACHE_SIZE) { c_ = 0; memset(max_key.content, (std::numeric_limits<unsigned char>::max)(), MAX_QUERY_LEN); memset(min_key.content, (std::numeric_limits<unsigned char>::min)(), MAX_QUERY_LEN); testcache_.enable_prefetching(); STXXL_MSG("Records in map: " << testcache_.size()); }

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• change maxlength depending of the option selected

  - by tuner3000

  I've seen similar questions posted and tried to change them to meet my needs but I don't know enough about javascript to do it. I need that when a user change the dropdown select, the "titre text field" maxlength is dynamically changed a, b c and d max maxlength should be 40 and e maxlength should be 2 my code is below, I don't know why but it is not working correctly: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>title page</title> </head> <body> <script type="text/javascript"> function changeValue(dropdown) { var option = dropdown.options[dropdown.selectedIndex].value, field = document.getElementById('titre'); if (option == 'a' || option == 'b' || option == 'c' || option == 'd') { field.maxLength = 40; } else if (option == 'e') { field.value = field.value.substr(0, 2); // before reducing the maxlength, make sure it contains at most two characters; you could also reset the value altogether field.maxLength = 2; } }? </script> <form action="converter.php" method="post"> <h2>Feel all field below:</h2> <div> Title: <input type="texte" name="titre" id="titre" maxLength="40"/> Format: <select id="format" name="format" onchange="changeValue(this);"> <option value="a">A</option> <option value="b">B</option> <option value="c">C</option> <option value="d">D</option> <option value="e">E</option> </select> </div> <div> <textarea name="texte" style="width: 415px; height: 155px;"></textarea> </div> <div> <input type="submit" value="OK" /> </div> </form> </body> </html>

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• R: Plotting a graph with different colors of points based on advanced criteria

  - by balconydoor

  What I would like to do is a plot (using ggplot), where the x axis represent years which have a different colour for the last three years in the plot than the rest. The last three years should also meet a certain criteria and based on this the last three years can either be red or green. The criteria is that the mean of the last three years should be less (making it green) or more (making it red) than the 66%-percentile of the remaining years. So far I have made two different functions calculating the last three year mean: LYM3 <- function (x) { LYM3 <- tail(x,3) mean(LYM3$Data,na.rm=T) } And the 66%-percentile for the remaining: perc66 <- function(x) { percentile <- head(x,-3) quantile(percentile$Data, .66, names=F,na.rm=T) } Here are two sets of data that can be used in the calculations (plots), the first which is an example from my real data where LYM3(df1) < perc66(df1) and the second is just made up data where LYM3 perc66. df1<- data.frame(Year=c(1979:2010), Data=c(347261.87, 145071.29, 110181.93, 183016.71, 210995.67, 205207.33, 103291.78, 247182.10, 152894.45, 170771.50, 206534.55, 287770.86, 223832.43, 297542.86, 267343.54, 475485.47, 224575.08, 147607.81, 171732.38, 126818.10, 165801.08, 136921.58, 136947.63, 83428.05, 144295.87, 68566.23, 59943.05, 49909.08, 52149.11, 117627.75, 132127.79, 130463.80)) df2 <- data.frame(Year=c(1979:2010), Data=c(sample(50,29,replace=T),75,75,75)) Here’s my code for my plot so far: plot <- ggplot(df1, aes(x=Year, y=Data)) + theme_bw() + geom_point(size=3, aes(colour=ifelse(df1$Year<2008, "black",ifelse(LYM3(df1) < perc66(df1),"green","red")))) + geom_line() + scale_x_continuous(breaks=c(1980,1985,1990,1995,2000,2005,2010), limits=c(1978,2011)) plot As you notice it doesn’t really do what I want it to do. The only thing it does seem to do is that it turns the years before 2008 into one level and those after into another one and base the point colour off these two levels. Since I don’t want this year to be stationary either, I made another tiny function: fun3 <- function(x) { df <- subset(x, Year==(max(Year)-2)) df$Year } So the previous code would have the same effect as: geom_point(size=3, aes(colour=ifelse(df1$Year<fun3(df1), "black","red"))) But it still does not care about my colours. Why does it make the years into levels? And how come an ifelse function doesn’t work within another one in this case? How would it be possible to the arguments to do what I like? I realise this might be a bit messy, asking for a lot at the same time, but I hope my description is pretty clear. It would be helpful if someone could at least point me in the right direction. I tried to put the code for the plot into a function as well so I wouldn’t have to change the data frame at all functions within the plot, but I can’t get it to work. Thank you!

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• Can MySQL reasonably perform queries on billions of rows?

  - by haxney

  I am planning on storing scans from a mass spectrometer in a MySQL database and would like to know whether storing and analyzing this amount of data is remotely feasible. I know performance varies wildly depending on the environment, but I'm looking for the rough order of magnitude: will queries take 5 days or 5 milliseconds? Input format Each input file contains a single run of the spectrometer; each run is comprised of a set of scans, and each scan has an ordered array of datapoints. There is a bit of metadata, but the majority of the file is comprised of arrays 32- or 64-bit ints or floats. Host system |----------------+-------------------------------| | OS | Windows 2008 64-bit | | MySQL version | 5.5.24 (x86_64) | | CPU | 2x Xeon E5420 (8 cores total) | | RAM | 8GB | | SSD filesystem | 500 GiB | | HDD RAID | 12 TiB | |----------------+-------------------------------| There are some other services running on the server using negligible processor time. File statistics |------------------+--------------| | number of files | ~16,000 | | total size | 1.3 TiB | | min size | 0 bytes | | max size | 12 GiB | | mean | 800 MiB | | median | 500 MiB | | total datapoints | ~200 billion | |------------------+--------------| The total number of datapoints is a very rough estimate. Proposed schema I'm planning on doing things "right" (i.e. normalizing the data like crazy) and so would have a runs table, a spectra table with a foreign key to runs, and a datapoints table with a foreign key to spectra. The 200 Billion datapoint question I am going to be analyzing across multiple spectra and possibly even multiple runs, resulting in queries which could touch millions of rows. Assuming I index everything properly (which is a topic for another question) and am not trying to shuffle hundreds of MiB across the network, is it remotely plausible for MySQL to handle this? UPDATE: additional info The scan data will be coming from files in the XML-based mzML format. The meat of this format is in the <binaryDataArrayList> elements where the data is stored. Each scan produces = 2 <binaryDataArray> elements which, taken together, form a 2-dimensional (or more) array of the form [[123.456, 234.567, ...], ...]. These data are write-once, so update performance and transaction safety are not concerns. My naïve plan for a database schema is: runs table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | start_time | TIMESTAMP | | name | VARCHAR | |-------------+-------------| spectra table | column name | type | |----------------+-------------| | id | PRIMARY KEY | | name | VARCHAR | | index | INT | | spectrum_type | INT | | representation | INT | | run_id | FOREIGN KEY | |----------------+-------------| datapoints table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | spectrum_id | FOREIGN KEY | | mz | DOUBLE | | num_counts | DOUBLE | | index | INT | |-------------+-------------| Is this reasonable?

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• How to manually (bitwise) perform (float)x? (homework)

  - by Silver

  Now, here is the function header of the function I'm supposed to implement: /* * float_from_int - Return bit-level equivalent of expression (float) x * Result is returned as unsigned int, but * it is to be interpreted as the bit-level representation of a * single-precision floating point values. * Legal ops: Any integer/unsigned operations incl. ||, &&. also if, while * Max ops: 30 * Rating: 4 */ unsigned float_from_int(int x) { ... } We aren't allowed to do float operations, or any kind of casting. Now I tried to implement the first algorithm given at this site: http://locklessinc.com/articles/i2f/ Here's my code: unsigned float_from_int(int x) { // grab sign bit int xIsNegative = 0; int absValOfX = x; if(x < 0){ xIsNegative = 1; absValOfX = -x; } // zero case if(x == 0){ return 0; } //int shiftsNeeded = 0; /*while(){ shiftsNeeded++; }*/ unsigned I2F_MAX_BITS = 15; unsigned I2F_MAX_INPUT = ((1 << I2F_MAX_BITS) - 1); unsigned I2F_SHIFT = (24 - I2F_MAX_BITS); unsigned result, i, exponent, fraction; if ((absValOfX & I2F_MAX_INPUT) == 0) result = 0; else { exponent = 126 + I2F_MAX_BITS; fraction = (absValOfX & I2F_MAX_INPUT) << I2F_SHIFT; i = 0; while(i < I2F_MAX_BITS) { if (fraction & 0x800000) break; else { fraction = fraction << 1; exponent = exponent - 1; } i++; } result = (xIsNegative << 31) | exponent << 23 | (fraction & 0x7fffff); } return result; } But it didn't work (see test error below): Test float_from_int(-2147483648[0x80000000]) failed... ...Gives 0[0x0]. Should be -822083584[0xcf000000] 4 4 0 float_times_four I don't know where to go from here. How should I go about parsing the float from this int?

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• Help with code optimization

  - by Ockonal

  Hello, I've written a little particle system for my 2d-application. Here is raining code: // HPP ----------------------------------- struct Data { float x, y, x_speed, y_speed; int timeout; Data(); }; std::vector<Data> mData; bool mFirstTime; void processDrops(float windPower, int i); // CPP ----------------------------------- Data::Data() : x(rand()%ScreenResolutionX), y(0) , x_speed(0), y_speed(0), timeout(rand()%130) { } void Rain::processDrops(float windPower, int i) { int posX = rand() % mWindowWidth; mData[i].x = posX; mData[i].x_speed = WindPower*0.1; // WindPower is float mData[i].y_speed = Gravity*0.1; // Gravity is 9.8 * 19.2 // If that is first time, process drops randomly with window height if (mFirstTime) { mData[i].timeout = 0; mData[i].y = rand() % mWindowHeight; } else { mData[i].timeout = rand() % 130; mData[i].y = 0; } } void update(float windPower, float elapsed) { // If this is first time - create array with new Data structure objects if (mFirstTime) { for (int i=0; i < mMaxObjects; ++i) { mData.push_back(Data()); processDrops(windPower, i); } mFirstTime = false; } for (int i=0; i < mMaxObjects; i++) { // Sleep until uptime > 0 (To make drops fall with randomly timeout) if (mData[i].timeout > 0) { mData[i].timeout--; } else { // Find new x/y positions mData[i].x += mData[i].x_speed * elapsed; mData[i].y += mData[i].y_speed * elapsed; // Find new speeds mData[i].x_speed += windPower * elapsed; mData[i].y_speed += Gravity * elapsed; // Drawing here ... // If drop has been falled out of the screen if (mData[i].y > mWindowHeight) processDrops(windPower, i); } } } So the main idea is: I have some structure which consist of drop position, speed. I have a function for processing drops at some index in the vector-array. Now if that's first time of running I'm making array with max size and process it in cycle. But this code works slower that all another I have. Please, help me to optimize it. I tried to replace all int with uint16_t but I think it doesn't matter.

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• c# video equivalent to image.fromstream? Or changing the scope of the following script to allow vide

  - by Daniel

  The following is a part of an upload class in a c# script. I'm a php programmer, I've never messed with c# much but I'm trying to learn. This upload script will not handle anything except images, I need to adapt this class to handle other types of media also, or rewrite it all together. If I'm correct, I realize that using (Image image = Image.FromStream(file.InputStream)) basically says that the scope of the following is Image, only an image can be used or the object is discarded? And also that the variable image is being created from an Image from the file stream, which I understand to be, like... the $_FILES array in php? I dunno, I don't really care about making thumbnails right now either way, so if this can be taken out and still process the upload I'm totally cool with that, I just haven't had any luck getting this thing to take anything but images, even when commenting out that whole part of the class... protected void Page_Load(object sender, EventArgs e) { string dir = Path.Combine(Request.PhysicalApplicationPath, "files"); if (Request.Files.Count == 0) { // No files were posted Response.StatusCode = 500; } else { try { // Only one file at a time is posted HttpPostedFile file = Request.Files[0]; // Size limit 100MB if (file.ContentLength > 102400000) { // File too large Response.StatusCode = 500; } else { string id = Request.QueryString["userId"]; string[] folders = userDir(id); foreach (string folder in folders) { dir = Path.Combine(dir, folder); if (!Directory.Exists(dir)) Directory.CreateDirectory(dir); } string path = Path.Combine(dir, String.Concat(Request.QueryString["batchId"], "_", file.FileName)); file.SaveAs(path); // Create thumbnail int dot = path.LastIndexOf('.'); string thumbpath = String.Concat(path.Substring(0, dot), "_thumb", path.Substring(dot)); using (Image image = Image.FromStream(file.InputStream)) { // Find the ratio that will create maximum height or width of 100px. double ratio = Math.Max(image.Width / 100.0, image.Height / 100.0); using (Image thumb = new Bitmap(image, new Size((int)Math.Round(image.Width / ratio), (int)Math.Round(image.Height / ratio)))) { using (Graphics graphic = Graphics.FromImage(thumb)) { // Make sure thumbnail is not crappy graphic.SmoothingMode = SmoothingMode.HighQuality; graphic.InterpolationMode = InterpolationMode.High; graphic.CompositingQuality = CompositingQuality.HighQuality; // JPEG ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders()[1]; // 90% quality EncoderParameters encode = new EncoderParameters(1); encode.Param[0] = new EncoderParameter(Encoder.Quality, 90L); // Resize graphic.DrawImage(image, new Rectangle(0, 0, thumb.Width, thumb.Height)); // Save thumb.Save(thumbpath, codec, encode); } } } // Success Response.StatusCode = 200; } } catch { // Something went wrong Response.StatusCode = 500; } } }

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• Slideshow positioning problem

  - by James

  I have a javascript slideshow that works perfectly on Windows 7, Firefox, Chrome, IE 8+ (I don't have the resources to check 6 or 7) and Opera. But I've been told that when on xp with IE 7 the slidshow gets thrown off screen to the right. What could my issue be? Here is my css: #page { width:940px; margin: auto; } gallery { position:relative; padding:0px; margin:5px 0px; width:940px; height:320px; } gallery li { display: block; width:940px; height:320 list-style:none; } And here is my javascript: var galleryId = 'gallery'; var gallery; var galleryImages; var currentImage; var previousImage; var preInitTimer; preInit(); function preInit() { if ((document.getElementById)&&(gallery=document.getElementById(galleryId))) { gallery.style.visibility = "hidden"; if (typeof preInitTimer != 'undefined') clearTimeout(preInitTimer); } else { preInitTimer = setTimeout("preInit()",2); } } function fader(imageNumber,opacity) { var obj=galleryImages[imageNumber]; if (obj.style) { if (obj.style.MozOpacity!=null) { obj.style.MozOpacity = (opacity/100) - .001; } else if (obj.style.opacity!=null) { obj.style.opacity = (opacity/100) - .001; } else if (obj.style.filter!=null) { obj.style.filter = "alpha(opacity="+opacity+")"; } } } function fadeInit() { if (document.getElementById) { preInit(); galleryImages = new Array; var node = gallery.firstChild; while (node) { if (node.nodeType==1) { galleryImages.push(node); } node = node.nextSibling; } for(i=0;i galleryImages[i].style.position='absolute'; galleryImages[i].style.top=0; galleryImages[i].style.zIndex=0; fader(i,0); } gallery.style.visibility = 'visible'; currentImage=0; previousImage=galleryImages.length-1; opacity=100; fader(currentImage,100); window.setTimeout("crossfade(100)", 1000); } } function crossfade(opacity) { if (opacity < 100) { fader(currentImage,opacity); opacity += 9; window.setTimeout("crossfade("+opacity+")", 50); } else { fader(previousImage,0); previousImage=currentImage; currentImage+=1; if (currentImage=galleryImages.length) { currentImage=0; } galleryImages[previousImage].style.zIndex = 0; galleryImages[currentImage].style.zIndex = 100; opacity=0; window.setTimeout("crossfade("+opacity+")", 5000); } } addEvent(window,'load',fadeInit) function addEvent(elm, evType, fn, useCapture) { if (elm.addEventListener){ elm.addEventListener(evType, fn, useCapture); return true; } else if (elm.attachEvent){ var r = elm.attachEvent("on"+evType, fn); return r; } } And ideas?

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• why resubmit after refresh php page

  - by user2719452

  why resubmit after refresh php page? try it, go to: http://qass.im/message-envelope/ and upload any image now try click F5, after refresh page "resubmit" Why? I don't want resubmit after refresh page What is the solution? See this is my form code: <form id="uploadedfile" name="uploadedfile" enctype="multipart/form-data" action="upload.php" method="POST"> <input name="uploadedfile" type="file" /> <input type="submit" value="upload" /> </form> See this is php code upload.php file: <?php $allowedExts = array("gif", "jpeg", "jpg", "png", "zip", "pdf", "docx", "rar", "txt", "doc"); $temp = explode(".", $_FILES["uploadedfile"]["name"]); $extension = end($temp); $newname = $extension.'_'.substr(str_shuffle(str_repeat("0123456789abcdefghijklmnopqrstuvwxyz", 7)), 4, 7); $imglink = 'attachment/attachment_file_'; $uploaded = $imglink .$newname.'.'.$extension; if ((($_FILES["uploadedfile"]["type"] == "image/jpeg") || ($_FILES["uploadedfile"]["type"] == "image/jpeg") || ($_FILES["uploadedfile"]["type"] == "image/jpg") || ($_FILES["uploadedfile"]["type"] == "image/pjpeg") || ($_FILES["uploadedfile"]["type"] == "image/x-png") || ($_FILES["uploadedfile"]["type"] == "image/gif") || ($_FILES["uploadedfile"]["type"] == "image/png") || ($_FILES["uploadedfile"]["type"] == "application/msword") || ($_FILES["uploadedfile"]["type"] == "text/plain") || ($_FILES["uploadedfile"]["type"] == "application/vnd.openxmlformats-officedocument.wordprocessingml.document") || ($_FILES["uploadedfile"]["type"] == "application/pdf") || ($_FILES["uploadedfile"]["type"] == "application/x-rar-compressed") || ($_FILES["uploadedfile"]["type"] == "application/x-zip-compressed") || ($_FILES["uploadedfile"]["type"] == "application/zip") || ($_FILES["uploadedfile"]["type"] == "multipart/x-zip") || ($_FILES["uploadedfile"]["type"] == "application/x-compressed") || ($_FILES["uploadedfile"]["type"] == "application/octet-stream")) && ($_FILES["uploadedfile"]["size"] < 5242880) // Max size is 5MB && in_array($extension, $allowedExts)) { move_uploaded_file($_FILES["uploadedfile"]["tmp_name"], $uploaded ); echo '<a target="_blank" href="'.$uploaded.'">click</a>'; // If has been uploaded file echo '<h3>'.$uploaded.'</h3>'; } if($_FILES["uploadedfile"]["error"] > 0){ echo '<h3>Please choose file to upload it!</h3>'; // If you don't choose file } elseif(!in_array($extension, $allowedExts)){ echo '<h3>This extension is not allowed!</h3>'; // If you choose file not allowed } elseif($_FILES["uploadedfile"]["size"] > 5242880){ echo "Big size!"; // If you choose big file } ?> if you have solution, please edit my php code and paste your solution code! Thanks.

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• remove/ignore float from outer div

  - by acidzombie24

  This may sound weird but i have some css which aligns mys divs. In one place i also use http://www.brunildo.org/test/img_center.html which centers images. Now i want my divs inside a larger div to go to another line if this one gets full. float: left seems to be the answer. The problem is it ruins my formatting. Including solution in the above link. I have this test code. If i remove the width and float it looks fine except it may take up too much space and not go to another line. I was thinking i could use float on an outerdiv and center the image within. However float: left is still breaking it. I am hoping there is a way to remove the float so each div does go left but the div inside centers correctly not breaking my formatting. <style type="text/css"> .wraptocenter { display: table-cell; text-align: center; vertical-align: middle; width: 200px; height: 200px; background: blue; } .wraptocenter * { vertical-align: middle; } /*\*//*/ .wraptocenter { display: block; } .wraptocenter span { display: inline-block; height: 100%; width: 1px; } /**/ div.c { background: red; overflow: hidden; min-width: 400px; max-width: 400px; } div.c div { float: left; } </style> <!--[if lt IE 8]><style> .wraptocenter span { display: inline-block; height: 100%; } </style><![endif]--> <div class="c"> <div> <div> <div class="wraptocenter"><span></span><img src="a.jpg" alt="/a.jpg"></div> <div class="wraptocenter"><span></span><img src="a.jpg" alt="/a.jpg"></div> <div class="wraptocenter"><span></span><img src="a.jpg" alt="/a.jpg"></div> </div></div></div>

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• pagination - 10 pages per page

  - by arthur

  I have a pagination script that displays a list of all pages like so: prev [1][2][3][4][5][6][7][8][9][10][11][12][13][14] next But I would like to only show ten of the numbers at a time: prev [3][4][5][6][7][8][9][10][11][12] next How can I accomplish this? Here is my code so far: <?php /* Set current, prev and next page */ $page = (!isset($_GET['page']))? 1 : $_GET['page']; $prev = ($page - 1); $next = ($page + 1); /* Max results per page */ $max_results = 2; /* Calculate the offset */ $from = (($page * $max_results) - $max_results); /* Query the db for total results. You need to edit the sql to fit your needs */ $result = mysql_query("select title from topics"); $total_results = mysql_num_rows($result); $total_pages = ceil($total_results / $max_results); $pagination = ''; /* Create a PREV link if there is one */ if($page > 1) { $pagination .= '< a hr_ef="?page='.$prev.'">Previous</a> '; } /* Loop through the total pages */ for($i = 1; $i <= $total_pages; $i++) { if(($page) == $i) { $pagination .= $i; } else { $pagination .= '< a hr_ef="index.php?page='.$i.'">'.$i.'</a>'; } } /* Print NEXT link if there is one */ if($page < $total_pages) { $pagination .= '< a hr_ef="?page='.$next.'"> Next</a>'; } /* Now we have our pagination links in a variable($pagination) ready to print to the page. I pu it in a variable because you may want to show them at the top and bottom of the page */ /* Below is how you query the db for ONLY the results for the current page */ $result=mysql_query("select * from topics LIMIT $from, $max_results "); while ($i = mysql_fetch_array($result)) { echo $i['title'].'<br />'; } echo $pagination; ?>

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• UIScrollView message handler

  - by cs221313

  Hi, all, I want to create a scroll view and put thumbnail view in that scroll view. but I can not get the touchBegan message in my program. My source code is like following. - (void)viewDidLoad { [super viewDidLoad]; NSError* error; NSString *bundleRoot = [[NSBundle mainBundle] bundlePath]; dirContents = [[[NSFileManager defaultManager] contentsOfDirectoryAtPath:bundleRoot error: &error] copy]; scrollView = [[UIScrollView alloc] initWithFrame:[[self view] bounds]]; scrollView.pagingEnabled = YES; scrollView.showsHorizontalScrollIndicator = NO; scrollView.userInteractionEnabled = YES; scrollView.clipsToBounds = YES; // default is NO, we want to restrict drawing within our scrollview scrollView.scrollEnabled = YES; [scrollView setDelegate:self]; [[self view] addSubview:scrollView]; DLog(@"scroll frame top = %d, left = %d, width = %d, height = %d", scrollView.frame.origin.x, scrollView.frame.origin.y, scrollView.frame.size.width, scrollView.frame.size.height); int i, j; UIView* onePageView = [[UIView alloc] init]; int pageNumber = 0; int iconNumber = 0; for (NSString *tString in dirContents) { if ([tString hasSuffix:@"_chess.png"]) { if(iconNumber == 9) { onePageView.tag = pageNumber + 1; [scrollView addSubview: onePageView]; onePageView = [[UIView alloc] init]; pageNumber++; iconNumber = 0; } j = iconNumber % 3; i = iconNumber / 3; const float WIDTH = 150.0; const float HEIGHT = 150.0; CGRect imageRect = CGRectMake(j * 200 + 50.0, i * 200 + 50.0, WIDTH, HEIGHT); //remove the charactors of "_chess.png". NSString* sgfName = [tString substringToIndex: tString.length - 10]; sgfName = [sgfName stringByAppendingString: @".sgf"]; ThumbnailView *thumbnailImage = [[ThumbnailView alloc] initWithFilename: sgfName frame: imageRect]; thumbnailImage.delegate = self; [thumbnailImage setImage:[UIImage imageNamed: tString]]; thumbnailImage.opaque = YES; // explicitly opaque for performance //[self.view addSubview:thumbnailImage]; [onePageView addSubview:thumbnailImage]; [thumbnailImage release]; iconNumber++; } } pageControl.numberOfPages = pageNumber + 1; pageControl.currentPage = 0; onePageView.tag = pageNumber + 1; [scrollView addSubview: onePageView]; [self layoutScrollPages]; } ThumbnailView class is like following. // // ThumbnailView.m // go // // Created by David Li on 2/18/11. // Copyright 2011 __MyCompanyName__. All rights reserved. // #import "common.h" #import "ThumbnailView.h" #import "ipad_goViewController.h" @implementation ThumbnailView @synthesize delegate; @synthesize sgfName; -(id) initWithFilename: (NSString*)filename frame: (CGRect)frame { sgfName = [[NSString alloc] initWithString: filename]; return [self initWithFrame: frame]; } - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code. self.userInteractionEnabled = YES; } return self; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; [self becomeFirstResponder]; } /* refer to http://stackoverflow.com/questions/855095/how-can-i-detect-the-touch-event-of-an-uiimageview */ -(BOOL)canBecomeFirstResponder { return YES; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { DLog(@"touched"); [[self delegate] loadGame: sgfName]; } /* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { // Drawing code. } */ - (void)dealloc { [super dealloc]; } @end I can not catch the touchesBegan message in my program. Can anyone help me? I stucked by this problem by couple days. Thanks so much.

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• How can I improve my select query for storing large versioned data sets?

  - by Jason Francis

  At work, we build large multi-page web applications, consisting mostly of radio and check boxes. The primary purpose of each application is to gather data, but as users return to a page they have previously visited, we report back to them their previous responses. Worst-case scenario, we might have up to 900 distinct variables and around 1.5 million users. For several reasons, it makes sense to use an insert-only approach to storing the data (as opposed to update-in-place) so that we can capture historical data about repeated interactions with variables. The net result is that we might have several responses per user per variable. Our table to collect the responses looks something like this: CREATE TABLE [dbo].[results]( [id] [bigint] IDENTITY(1,1) NOT NULL, [userid] [int] NULL, [variable] [varchar](8) NULL, [value] [tinyint] NULL, [submitted] [smalldatetime] NULL) Where id serves as the primary key. Virtually every request results in a series of insert statements (one per variable submitted), and then we run a select to produce previous responses for the next page (something like this): SELECT t.id, t.variable, t.value FROM results t WITH (NOLOCK) WHERE t.userid = '2111846' AND (t.variable='internat' OR t.variable='veteran' OR t.variable='athlete') AND t.id IN (SELECT MAX(id) AS id FROM results WITH (NOLOCK) WHERE userid = '2111846' AND (t.variable='internat' OR t.variable='veteran' OR t.variable='athlete') GROUP BY variable) Which, in this case, would return the most recent responses for the variables "internat", "veteran", and "athlete" for user 2111846. We have followed the advice of the database tuning tools in indexing the tables, and against our data, this is the best-performing version of the select query that we have been able to come up with. Even so, there seems to be significant performance degradation as the table approaches 1 million records (and we might have about 150x that). We have a fairly-elegant solution in place for sharding the data across multiple tables which has been working quite well, but I am open for any advice about how I might construct a better version of the select query. We use this structure frequently for storing lots of independent data points, and we like the benefits it provides. So the question is, how can I improve the performance of the select query? I assume the nested select statement is a bad idea, but I have yet to find an alternative that performs as well. Thanks in advance. NB: Since we emphasize creating over reading in this case, and since we never update in place, there doesn't seem to be any penalty (and some advantage) for using the NOLOCK directive in this case.

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• jQuery slider onChange auto submit form

  - by bikey77

  I'm using a jQuery slider as a price range selector in a form. I'd like to have the form submit automatically when one of the values has been changed. I used a couple of examples I found on SO but they didn't work with my code. <form action="itemlist.php" method="post" enctype="application/x-www-form-urlencoded" name="priceform" id="priceform" target="_self"> <div id="slider-holder"> Prices: From <span id="pricefromlabel">100 &#8364;</span> To <span id="pricetolabel">500 &#8364;</span> <input type="hidden" id="pricefrom" name="pricefrom" value="100" /> <input type="hidden" id="priceto" name="priceto" value="500" /> <div id="slider-range"></div> <input name="Search" type="submit" value="Search" /> </div> </form> This is the code that displays the values of the slider and updates 2 hidden form fields I use to store the prices in order to submit: <script> $(function() { $("#slider-range" ).slider({ range: true, min: 0, max: 1000, values: [ <?=$minprice?>, <?=$maxprice?> ], start: function (event, ui) { event.stopPropagation(); }, slide: function( event, ui ) { $( "#pricefrom" ).val(ui.values[0]); $( "#priceto" ).val(ui.values[1]); $( "#pricefromlabel" ).html(ui.values[0] + ' &euro;'); $( "#pricetolabel" ).html(ui.values[1] + ' &euro;'); } }); return false; }); </script> I've tried adding this code as well as an data-autosubmit="true" attribute to the div but no result. $(function() { $('[data-autosubmit="true"]').change(function() { parentForm = $(this).('#priceform'); clearTimeout(submitTimeout); submitTimeout = setTimeout(function() { parentForm.submit() }, 100); }); I've also tried adding a $.post() event to the slider but I'm not very good with jQuery so I'm probably doing it wrong. Any help will be appreciated.

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• Socket Programming : Inputstream Stuck in loop - read() always return 0

  - by Atom Skaa ska Hic

  Server side code public static boolean sendFile() { int start = Integer.parseInt(startAndEnd[0]) - 1; int end = Integer.parseInt(startAndEnd[1]) - 1; int size = (end - start) + 1; try { bos = new BufferedOutputStream(initSocket.getOutputStream()); bos.write(byteArr,start,size); bos.flush(); bos.close(); initSocket.close(); System.out.println("Send file to : " + initSocket); } catch (IOException e) { System.out.println(e.getLocalizedMessage()); disconnected(); return false; } return true; } Client Side public boolean receiveFile() { int current = 0; try { int bytesRead = bis.read(byteArr,0,byteArr.length); System.out.println("Receive file from : " + client); current = bytesRead; do { bytesRead = bis.read(byteArr, current, (byteArr.length-current)); if(bytesRead >= 0) current += bytesRead; } while(bytesRead != -1); bis.close(); bos.write(byteArr, 0 , current); bos.flush(); bos.close(); } catch (IOException e) { System.out.println(e.getLocalizedMessage()); disconnected(); return false; } return true; } Client side is multithreading,server side not use multithreading. I just paste some code that made problem if you want see all code please tell me. After I debug the code, I found that if I set max thread to any and then the first thread always stuck in this loop. That bis.read(....) always return 0. Although, server had close stream and it not get out of the loop. I don't know why ... But another threads are work correctly. do { bytesRead = bis.read(byteArr, current, (byteArr.length-current)); if(bytesRead >= 0) current += bytesRead; } while(bytesRead != -1);

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• Is throwing an exception a healthy way to exit?

  - by ramaseshan

  I have a setup that looks like this. class Checker { // member data Results m_results; // see below public: bool Check(); private: bool Check1(); bool Check2(); // .. so on }; Checker is a class that performs lengthy check computations for engineering analysis. Each type of check has a resultant double that the checker stores. (see below) bool Checker::Check() { // initilisations etc. Check1(); Check2(); // ... so on } A typical Check function would look like this: bool Checker::Check1() { double result; // lots of code m_results.SetCheck1Result(result); } And the results class looks something like this: class Results { double m_check1Result; double m_check2Result; // ... public: void SetCheck1Result(double d); double GetOverallResult() { return max(m_check1Result, m_check2Result, ...); } }; Note: all code is oversimplified. The Checker and Result classes were initially written to perform all checks and return an overall double result. There is now a new requirement where I only need to know if any of the results exceeds 1. If it does, subsequent checks need not be carried out(it's an optimisation). To achieve this, I could either: Modify every CheckN function to keep check for result and return. The parent Check function would keep checking m_results. OR In the Results::SetCheckNResults(), throw an exception if the value exceeds 1 and catch it at the end of Checker::Check(). The first is tedious, error prone and sub-optimal because every CheckN function further branches out into sub-checks etc. The second is non-intrusive and quick. One disadvantage is I can think of is that the Checker code may not necessarily be exception-safe(although there is no other exception being thrown anywhere else). Is there anything else that's obvious that I'm overlooking? What about the cost of throwing exceptions and stack unwinding? Is there a better 3rd option?

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• Lighttpd + fastcgi + python (for django) slow on first request

  - by EagleOne

  I'm having a problem with a django website I host with lighttpd + fastcgi. It works great but it seems that the first request always takes up to 3seconds. Subsequent requests are much faster (<1s). I activated access logs in lighttpd in order to track the issue. But I'm kind of stuck. Here are logs where I 'lose' 4s (from 10:04:17 to 10:04:21): 2012-12-01 10:04:17: (mod_fastcgi.c.3636) handling it in mod_fastcgi 2012-12-01 10:04:17: (response.c.470) -- before doc_root 2012-12-01 10:04:17: (response.c.471) Doc-Root : /var/www 2012-12-01 10:04:17: (response.c.472) Rel-Path : /finderauto.fcgi 2012-12-01 10:04:17: (response.c.473) Path : 2012-12-01 10:04:17: (response.c.521) -- after doc_root 2012-12-01 10:04:17: (response.c.522) Doc-Root : /var/www 2012-12-01 10:04:17: (response.c.523) Rel-Path : /finderauto.fcgi 2012-12-01 10:04:17: (response.c.524) Path : /var/www/finderauto.fcgi 2012-12-01 10:04:17: (response.c.541) -- logical -> physical 2012-12-01 10:04:17: (response.c.542) Doc-Root : /var/www 2012-12-01 10:04:17: (response.c.543) Rel-Path : /finderauto.fcgi 2012-12-01 10:04:17: (response.c.544) Path : /var/www/finderauto.fcgi 2012-12-01 10:04:21: (response.c.128) Response-Header: HTTP/1.1 200 OK Last-Modified: Sat, 01 Dec 2012 09:04:21 GMT Expires: Sat, 01 Dec 2012 09:14:21 GMT Content-Type: text/html; charset=utf-8 Cache-Control: max-age=600 Transfer-Encoding: chunked Date: Sat, 01 Dec 2012 09:04:21 GMT Server: lighttpd/1.4.28 I guess that if there is a problem, it's whith my configuration. So here is the way I launch my django app: python manage.py runfcgi method=threaded host=127.0.0.1 port=3033 And here is my lighttpd conf: server.modules = ( "mod_access", "mod_alias", "mod_compress", "mod_redirect", "mod_rewrite", "mod_fastcgi", "mod_accesslog", ) server.document-root = "/var/www" server.upload-dirs = ( "/var/cache/lighttpd/uploads" ) server.errorlog = "/var/log/lighttpd/error.log" server.pid-file = "/var/run/lighttpd.pid" server.username = "www-data" server.groupname = "www-data" accesslog.filename = "/var/log/lighttpd/access.log" debug.log-request-header = "enable" debug.log-response-header = "enable" debug.log-file-not-found = "enable" debug.log-request-handling = "enable" debug.log-timeouts = "enable" debug.log-ssl-noise = "enable" debug.log-condition-cache-handling = "enable" debug.log-condition-handling = "enable" fastcgi.server = ( "/finderauto.fcgi" => ( "main" => ( # Use host / port instead of socket for TCP fastcgi "host" => "127.0.0.1", "port" => 3033, #"socket" => "/home/finderadmin/finderauto.sock", "check-local" => "disable", "fix-root-scriptname" => "enable", ) ), ) alias.url = ( "/media" => "/home/user/django/contrib/admin/media/", ) url.rewrite-once = ( "^(/media.*)$" => "$1", "^/favicon\.ico$" => "/media/favicon.ico", "^(/.*)$" => "/finderauto.fcgi$1", ) index-file.names = ( "index.php", "index.html", "index.htm", "default.htm", " index.lighttpd.html" ) url.access-deny = ( "~", ".inc" ) static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" ) ## Use ipv6 if available #include_shell "/usr/share/lighttpd/use-ipv6.pl" dir-listing.encoding = "utf-8" server.dir-listing = "enable" compress.cache-dir = "/var/cache/lighttpd/compress/" compress.filetype = ( "application/x-javascript", "text/css", "text/html", "text/plain" ) include_shell "/usr/share/lighttpd/create-mime.assign.pl" include_shell "/usr/share/lighttpd/include-conf-enabled.pl" If any of you could help me finding out where I lose these 3 or 4 s. I would much appreciate. Thanks in advance!

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• SSIS - user variable used in derived column transform is not available - in some cases

  - by soo

  Unfortunately I don't have a repro for my issue, but I thought I would try to describe it in case it sounds familiar to someone... I am using SSIS 2005, SP2. My package has a package-scope user variable - let's call it user_var first step in the control flow is an Execute SQL task which runs a stored procedure. All that SP does is insert a record in a SQL table (with an identity column) and then go back and get the max ID value. The Execute SQL task saves this output into user_var the control flow then has a Data Flow Task - it goes and gets some source data, has a derived column which sets a column called run_id to user_var - and saves the data to a SQL destination In most cases (this template is used for many packages, running every day) this all works great. All of the destination records created get set with a correct run_id. However, in some cases, there is a set of the destination data that does not get run_id equal to user_var, but instead gets a value of 0 (0 is the default value for user_var). I have 2 instances where this has happened, but I can't make it happen. In both cases, it was just less that 10,000 records that have run_id = 0. Since SSIS writes data out in 10,000 record blocks, this really makes me think that, for the first set of data written out, user_var was not yet set. Then, after that first block, for the rest of the data, run_id is set to a correct value. But control passed on to my data flow from the Execute SQL task - it would have seemed reasonable to me that it wouldn't go on until the SP has completed and user_var is set. Maybe it just runs the SP, but doesn't wait for it to complete? In both cases where this has happened there seemed to be a few packages hitting the table to get a new user_var at about the same time. And in both cases lots of data was written (40 million rows, 60 million rows) - my thinking is that that means the writes were happening for a while. Sorry to be both long-winded AND vague. A winning combination! Does this sound familiar to anyone? Thanks.

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• Efficient method of finding database rows that have *one or more* qualities from a list of seven qualities

  - by hithere

  Hello! For this question, I'm looking to see if anyone has a better idea of how to implement what I'm currently planning on implementing (below): I'm keeping track of a set of images, using a database. Each image is represented by one row. I want to be able to search for images, using a number of different search parameters. One of these parameters involves a search-by-color option. (The rest of the search stuff is currently working fine.) Images in this database can contain up to seven colors: -Red -Orange -Yellow -Green -Blue -Indigo -Violet Here are some example user queries: "I want an image that contains red." "I want an image that contains red and blue." "I want an image that contains yellow and violet." "I want an image that contains red, orange, yellow, green, blue, indigo and violet." And so on. Users make this selection through the use of checkboxes in an html form. They can check zero checkboxes, all seven, and anything in between. I'm curious to hear what people think would be the most efficient way to perform this database search. I have two possible options right now, but I feel like there must be something better that I'm not thinking of. (Option 1) -For each row, simply have seven additional fields in the database, one for each color. Each field holds a 1 or 0 (true/false) value, and I SELECT based on whatever the user has checked off. (I didn't like this solution so much, because it seemed kind of wasteful to add seven additional fields...especially since most pictures in this table will only have 3-4 colors max, though some could have up to 7. So that means I'm storing a lot of zeros.) Also, if I added more searchable colors later on (which I don't think I will, but it's always possible), I'd have to add more fields. (Option 2) -For each image row, I could have a "colors" text field that stores space-separated color names (or numbers for the sake of compactness). Then I could do a fulltext match against search through the fields, selecting rows that contain "red yellow green" (or "1 3 4"). But I kind of didn't want to do fulltext searching because I already allow a keyword search, and I didn't really want to do two fulltext searches per image search. Plus, if the database gets big, fulltext stuff might slow down. Any better options that I didn't think of? Thanks! Side Note: I'm using PHP to work with a MySQL database.

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• Java Sorting "queue" list based on DateTime and Z Position (part of school project)

  - by Kuchinawa

  For a school project i have a list of 50k containers that arrive on a boat. These containers need to be sorted in a list in such a way that the earliest departure DateTimes are at the top and the containers above those above them. This list then gets used for a crane that picks them up in order. I started out with 2 Collection.sort() methods: 1st one to get them in the right XYZ order Collections.sort(containers, new Comparator<ContainerData>() { @Override public int compare(ContainerData contData1, ContainerData contData2) { return positionSort(contData1.getLocation(),contData2.getLocation()); } }); Then another one to reorder the dates while keeping the position in mind: Collections.sort(containers, new Comparator<ContainerData>() { @Override public int compare(ContainerData contData1, ContainerData contData2) { int c = contData1.getLeaveDateTimeFrom().compareTo(contData2.getLeaveDateTimeFrom()); int p = positionSort2(contData1.getLocation(), contData2.getLocation()); if(p != 0) c = p; return c; } }); But i never got this method to work.. What i got working now is rather quick and dirty and takes a long time to process (50seconds for all 50k): First a sort on DateTime: Collections.sort(containers, new Comparator<ContainerData>() { @Override public int compare(ContainerData contData1, ContainerData contData2) { return contData1.getLeaveDateTimeFrom().compareTo(contData2.getLeaveDateTimeFrom()); } }); Then a correction function that bumps top containers up: containers = stackCorrection(containers); private static List<ContainerData> stackCorrection(List<ContainerData> sortedContainerList) { for(int i = 0; i < sortedContainerList.size(); i++) { ContainerData current = sortedContainerList.get(i); // 5 = Max Stack (0 index) if(current.getLocation().getZ() < 5) { //Loop through possible containers above current for(int j = 5; j > current.getLocation().getZ(); --j) { //Search for container above for(int k = i + 1; k < sortedContainerList.size(); ++k) if(sortedContainerList.get(k).getLocation().getX() == current.getLocation().getX()) { if(sortedContainerList.get(k).getLocation().getY() == current.getLocation().getY()) { if(sortedContainerList.get(k).getLocation().getZ() == j) { //Found -> move container above current sortedContainerList.add(i, sortedContainerList.remove(k)); k = sortedContainerList.size(); i++; } } } } } } return sortedContainerList; } I would like to implement this in a better/faster way. So any hints are appreciated. :)

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• How can I scale movement physics functions to frames per second (in a game engine)?

  - by Richard

  I am working on a game in Javascript (HTML5 Canvas). I implemented a simple algorithm that allows an object to follow another object with basic physics mixed in (a force vector to drive the object in the right direction, and the velocity stacks momentum, but is slowed by a constant drag force). At the moment, I set it up as a rectangle following the mouse (x, y) coordinates. Here's the code: // rectangle x, y position var x = 400; // starting x position var y = 250; // starting y position var FPS = 60; // frames per second of the screen // physics variables: var velX = 0; // initial velocity at 0 (not moving) var velY = 0; // not moving var drag = 0.92; // drag force reduces velocity by 8% per frame var force = 0.35; // overall force applied to move the rectangle var angle = 0; // angle in which to move // called every frame (at 60 frames per second): function update(){ // calculate distance between mouse and rectangle var dx = mouseX - x; var dy = mouseY - y; // calculate angle between mouse and rectangle var angle = Math.atan(dy/dx); if(dx < 0) angle += Math.PI; else if(dy < 0) angle += 2*Math.PI; // calculate the force (on or off, depending on user input) var curForce; if(keys[32]) // SPACE bar curForce = force; // if pressed, use 0.35 as force else curForce = 0; // otherwise, force is 0 // increment velocty by the force, and scaled by drag for x and y velX += curForce * Math.cos(angle); velX *= drag; velY += curForce * Math.sin(angle); velY *= drag; // update x and y by their velocities x += velX; y += velY; And that works fine at 60 frames per second. Now, the tricky part: my question is, if I change this to a different framerate (say, 30 FPS), how can I modify the force and drag values to keep the movement constant? That is, right now my rectangle (whose position is dictated by the x and y variables) moves at a maximum speed of about 4 pixels per second, and accelerates to its max speed in about 1 second. BUT, if I change the framerate, it moves slower (e.g. 30 FPS accelerates to only 2 pixels per frame). So, how can I create an equation that takes FPS (frames per second) as input, and spits out correct "drag" and "force" values that will behave the same way in real time? I know it's a heavy question, but perhaps somebody with game design experience, or knowledge of programming physics can help. Thank you for your efforts. jsFiddle: http://jsfiddle.net/BadDB

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• LINQ to SQL and missing Many to Many EntityRefs

  - by Rick Strahl

  Ran into an odd behavior today with a many to many mapping of one of my tables in LINQ to SQL. Many to many mappings aren’t transparent in LINQ to SQL and it maps the link table the same way the SQL schema has it when creating one. In other words LINQ to SQL isn’t smart about many to many mappings and just treats it like the 3 underlying tables that make up the many to many relationship. Iain Galloway has a nice blog entry about Many to Many relationships in LINQ to SQL. I can live with that – it’s not really difficult to deal with this arrangement once mapped, especially when reading data back. Writing is a little more difficult as you do have to insert into two entities for new records, but nothing that can’t be handled in a small business object method with a few lines of code. When I created a database I’ve been using to experiment around with various different OR/Ms recently I found that for some reason LINQ to SQL was completely failing to map even to the linking table. As it turns out there’s a good reason why it fails, can you spot it below? (read on :-}) Here is the original database layout: There’s an items table, a category table and a link table that holds only the foreign keys to the Items and Category tables for a typical M->M relationship. When these three tables are imported into the model the *look* correct – I do get the relationships added (after modifying the entity names to strip the prefix): The relationship looks perfectly fine, both in the designer as well as in the XML document: <Table Name="dbo.wws_Item_Categories" Member="ItemCategories"> <Type Name="ItemCategory"> <Column Name="ItemId" Type="System.Guid" DbType="uniqueidentifier NOT NULL" CanBeNull="false" /> <Column Name="CategoryId" Type="System.Guid" DbType="uniqueidentifier NOT NULL" CanBeNull="false" /> <Association Name="ItemCategory_Category" Member="Categories" ThisKey="CategoryId" OtherKey="Id" Type="Category" /> <Association Name="Item_ItemCategory" Member="Item" ThisKey="ItemId" OtherKey="Id" Type="Item" IsForeignKey="true" /> </Type> </Table> <Table Name="dbo.wws_Categories" Member="Categories"> <Type Name="Category"> <Column Name="Id" Type="System.Guid" DbType="UniqueIdentifier NOT NULL" IsPrimaryKey="true" IsDbGenerated="true" CanBeNull="false" /> <Column Name="ParentId" Type="System.Guid" DbType="UniqueIdentifier" CanBeNull="true" /> <Column Name="CategoryName" Type="System.String" DbType="NVarChar(150)" CanBeNull="true" /> <Column Name="CategoryDescription" Type="System.String" DbType="NVarChar(MAX)" CanBeNull="true" /> <Column Name="tstamp" AccessModifier="Internal" Type="System.Data.Linq.Binary" DbType="rowversion" CanBeNull="true" IsVersion="true" /> <Association Name="ItemCategory_Category" Member="ItemCategory" ThisKey="Id" OtherKey="CategoryId" Type="ItemCategory" IsForeignKey="true" /> </Type> </Table> However when looking at the code generated these navigation properties (also on Item) are completely missing: [global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.wws_Item_Categories")] [global::System.Runtime.Serialization.DataContractAttribute()] public partial class ItemCategory : Westwind.BusinessFramework.EntityBase { private System.Guid _ItemId; private System.Guid _CategoryId; public ItemCategory() { } [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_ItemId", DbType="uniqueidentifier NOT NULL")] [global::System.Runtime.Serialization.DataMemberAttribute(Order=1)] public System.Guid ItemId { get { return this._ItemId; } set { if ((this._ItemId != value)) { this._ItemId = value; } } } [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_CategoryId", DbType="uniqueidentifier NOT NULL")] [global::System.Runtime.Serialization.DataMemberAttribute(Order=2)] public System.Guid CategoryId { get { return this._CategoryId; } set { if ((this._CategoryId != value)) { this._CategoryId = value; } } } } Notice that the Item and Category association properties which should be EntityRef properties are completely missing. They’re there in the model, but the generated code – not so much. So what’s the problem here? The problem – it appears – is that LINQ to SQL requires primary keys on all entities it tracks. In order to support tracking – even of the link table entity – the link table requires a primary key. Real obvious ain’t it, especially since the designer happily lets you import the table and even shows the relationship and implicitly the related properties. Adding an Id field as a Pk to the database and then importing results in this model layout: which properly generates the Item and Category properties into the link entity. It’s ironic that LINQ to SQL *requires* the PK in the middle – the Entity Framework requires that a link table have *only* the two foreign key fields in a table in order to recognize a many to many relation. EF actually handles the M->M relation directly without the intermediate link entity unlike LINQ to SQL. [updated from comments – 12/24/2009] Another approach is to set up both ItemId and CategoryId in the database which shows up in LINQ to SQL like this: This also work in creating the Category and Item fields in the ItemCategory entity. Ultimately this is probably the best approach as it also guarantees uniqueness of the keys and so helps in database integrity. It took me a while to figure out WTF was going on here – lulled by the designer to think that the properties should be when they were not. It’s actually a well documented feature of L2S that each entity in the model requires a Pk but of course that’s easy to miss when the model viewer shows it to you and even the underlying XML model shows the Associations properly. This is one of the issue with L2S of course – you have to play by its rules and once you hit one of those rules there’s no way around them – you’re stuck with what it requires which in this case meant changing the database.© Rick Strahl, West Wind Technologies, 2005-2010Posted in ADO.NET  LINQ  

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• CodePlex Daily Summary for Sunday, February 28, 2010

  CodePlex Daily Summary for Sunday, February 28, 2010New ProjectsESB Toolkit Extensions: ESB Extensions is a solution containing multiple .Net Projects and artifacts: Unit Tests, Itineraries, Business Rules, Binding Files, and C# Class ...Event-Based Components Binder: The Binder automatically connects output-pins to input-pins of Event-Based Components based on message type information and naming conventions. ...Haze Anti-Virus: Haze Anti-Virus is a anti virus written in C# and has features such a realtime process watching and a Process Blacklist, and is able to download Da...latex2mathml: A .NET 2.0 library written in C# which allows the conversion of LaTeX documents to XHTML+MathML format. A stand-alone converter is included. The li...Project Lyrebird: Project lyrebird is a attempt to create a all-purpose media player. It is designed to be simple, yet powerful. Its written in C#QueryToGrid Module for DotNetNuke®: This is a module that allows you to execute and display the results of T-SQL queries in DotNetNuke using your choice of AJAX grids.Reusable Library Demo: A demonstration of reusable abstractions for enterprise application developerSharePoint 2010 Conference Samples: This project contains source code from various SharePoint 2010 conferences where Scot Hillier presented.Silverlight Photo Blogger: Silverlight Photo Blogger gives you the tools you need to capture and blog about your travels in a rich and interactive web experience. Enjoy som...SMTP Test: Several times we are faced with applications that send email, the SMTP Tester principle objective is to test various possibilities of sendingSolution Tools - tools for Visual Studio solutions and projects: Solution Tools are a collection of tools that you can use with your Visual Studio Solutions and projects.New ReleasesAgile Poker Cards for Windows Mobile: Agile Poker Cards v1.1.0.0: Agile Poker Cards v1.1.0.0 Use this application to display poker cards in a planning session on a Windows Mobile device. Release notes Added new ...BuildTools - Toolset for automated builds: BuildTools 2.0 Feb 2010 Milestone: The Feb 2010 Milestone release is a complete rewrite of the old codebase in Visual Studio 2010 RC. It features MSBuild tasks for generating build v...Composure: NHibernate-Trunk-2010-02-25-VS2010.NET4 Alpha1: Recent NHibernate-Trunk conversion for Visual Studio 2010 Beta2 against .NET 4.0. Although all of the tests pass (other than the "Ignored"), this ...Employee Scheduler: Employee Scheduler 2.4: Extract the files to a directory and run Lab Hours.exe. Add an employee. Double click an employee to modify their times. Please contact me through ...ESB Toolkit Extensions: Tellago BizTalk ESB 2.0 Toolkit Extensions: Windows Installer file that installs Library on a BizTalk ESB 2.0 system. This Install automatically configures the esb.config to use the new compo...Haze Anti-Virus: Haze Anti-Virus Binary v1.0.3: This is the Compiled version of Haze Anti-Virus, please let me know about any bugs, thanks Please Note that Database updating is currently not avai...Haze Anti-Virus: Haze Anti-Virus Source v1.0.3: This is the source for Haze Anti-VirusHOG Project: HOG Visual Studio Template: This is Visual Studio HOG Template. Created by the great tool: Solution FactoryHOG Project: Template user guide: HOW TOiTuner - The iTunes Companion: iTuner 1.1.3711: Two new features are available: the Automated Librarian and Playlist Exporter. The iTuner Automated Librarian automatically cleans the iTunes libr...johanleino.codeplex.com: SilverlightMultiLevelNavigationExample: The source code for SilverlightMultiLevelNavigationExample (VS 2010)MDownloader: MDownloader-0.15.3.56128: Fixed filefactory provider implementation after site changes.MiniTwitter: 1.09: MiniTwitter 1.09 更新内容 変更 スクロール位置がトップ以外の時は自動更新や発言時に位置を保持するように変更 タブ毎にスクロール位置が変わらないように変更 URL に ? や ! が含まれている時は短縮 URL に変換するように変更NMock3: NMock3 - Beta 4, .NET 3.5: This release includes the most current version of the NMock2 project code from Source Forge. Please start providing feedback on the tutorials. The...QueryUnit: QueryUnitPOC v. 0.0.0.7: - This version fixes problems related to the fact that in previous releases you had to specify expected values using locale-specific formats. Now e...RapidWebDev - .NET Enterprise Software Development Infrastructure: RapidWebDev 1.51: This is a hot-fix version for 1.5 which is added a new restful web service for concrete data and fixed some major bugs. The change list is as follo...Rawr: Rawr 2.3.11: - Load from Armory code cleaned up. - Tiny Abomination in a Jar's proc how now been more accurately modeled. - You should now be able to reload...Resharper Settings Manager: RSM v1.2: Changes Added Default Settings File option. The selected settings file will be loaded automatically for solutions with no settings sharing. Added...Reusable Library Demo: Reusable Library Demo v1.0.0: A demonstration of reusable abstractions for enterprise application developerRounded Corners / DIV Container: MJC RoundedDiv 3.2: This is the first public release on Codeplex.com. Versions previous to 3.2 were created before this control was made available on Codeplex.com.SharePoint 2010 Conference Samples: Samples: Download the samples from the conferencesSharePoint Outlook Connector: Version 1.2.2.8: Saving email message as list item and attachments as attachment of the list item functionality has been addedSharePoint URL Ping Tool: Url Ping Tool Solution: A solution that contain one fram fature that will add a link under Site Administration section in the Site Settings page.SMTP Test: Fist SMTP Tester: First ReleaseSolution Tools - tools for Visual Studio solutions and projects: SolutionTools binary: Initial release of the tool. Turns out, this project was just a big waste of effort - use Project Linker instead!Solution Tools - tools for Visual Studio solutions and projects: SolutionTools source - don't use this tool: Initial release of the tool. Turns out, this project was just a big waste of effort - use Project Linker instead! Anyway, here's the source code...Spark View Engine: Spark v1.1 RC1: Overview This build is a preview of v1.1. Among other changes it provides support for ASP.NET MVC 2 RC2. Spark v1.1 release will be created soon ...Sprite Sheet Packer: 2.0 Release: I'm calling this a full new release because I can. Refactored all of the build logic to sspack.exe. This allows you to run this from the command l...SPSF SharePoint Software Factory: SPSF SharePoint Software Factory 2.4.3: New features: WSPBuilder support, Simple Application now with optional multilanguage support, Extending deployment skript for large deployments Fix...TortoiseHg: Beta for TortoiseHg 1.0 (0.9.31201): Beta for TortoiseHg 1.0 (0.9.31201) Please backup your user Mercurial.ini file and then uninstall any 0.9.X release before installing Use the x86...UI Compiler .NET - JavaScript compiler/minifier built on Google Closure Compiler: UI Compiler .NET 1.5 Beta: UI Compiler .NET does not include Java. To be able to run Google Closure Compiler locally you must make sure that Java 6 is installed. If Java 6 (o...VCC: Latest build, v2.1.30227.0: Automatic drop of latest buildVisual Studio DSite: File Encryption and Decryption (Visual Basic 2008): This program will create an encrypted copy of the file specified. Also decrypt the file specified. This program contains the source code but if yo...Visual Studio DSite: Visual C++ 2008 CLR Console Application Random Int: This source code includes an example of generating a random integer between the numbers 1-100.Weather Forecast Control: MJC MyWeather 2.2: This is the first public release on Codeplex.com. Versions previous to 2.2 were created before this control was made available on Codeplex.com.Most Popular ProjectsRawrWBFS ManagerAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)Microsoft SQL Server Community & SamplesASP.NETDotNetNuke® Community EditionBlogEngine.NETMost Active ProjectsDinnerNow.netRawrBlogEngine.NETMapWindow GISSLARToolkit - Silverlight Augmented Reality ToolkitCommon Context Adapterspatterns & practices – Enterprise LibrarySharpMap - Geospatial Application Framework for the CLRNB_Store - Free DotNetNuke Ecommerce Catalog ModuleRapid Entity Framework. (ORM). CTP 2

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