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  • Entity Framework SaveChanges error details

    - by Marek Karbarz
    When saving changes with SaveChanges on a data context is there a way to determine which Entity causes an error? For example, sometimes I'll forget to assign a date to a non-nullable date field and get "Invalid Date Range" error, but I get no information about which entity or which field it's caused by (I can usually track it down by painstakingly going through all my objects, but it's very time consuming). Stack trace is pretty useless as it only shows me an error at the SaveChanges call without any additional information as to where exactly it happened. Note that I'm not looking to solve any particular problem I have now, I would just like to know in general if there's a way to tell which entity/field is causing a problem. Quick sample of a stack trace as an example - in this case an error happened because CreatedOn date was not set on IAComment entity, however it's impossible to tell from this error/stack trace [SqlTypeException: SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.] System.Data.SqlTypes.SqlDateTime.FromTimeSpan(TimeSpan value) +2127345 System.Data.SqlTypes.SqlDateTime.FromDateTime(DateTime value) +232 System.Data.SqlClient.MetaType.FromDateTime(DateTime dateTime, Byte cb) +46 System.Data.SqlClient.TdsParser.WriteValue(Object value, MetaType type, Byte scale, Int32 actualLength, Int32 encodingByteSize, Int32 offset, TdsParserStateObject stateObj) +4997789 System.Data.SqlClient.TdsParser.TdsExecuteRPC(_SqlRPC[] rpcArray, Int32 timeout, Boolean inSchema, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj, Boolean isCommandProc) +6248 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +987 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +141 System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +12 System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10 System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) +8084396 System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +267 [UpdateException: An error occurred while updating the entries. See the inner exception for details.] System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) +389 System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) +163 System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) +609 IADAL.IAController.Save(IAHeader head) in C:\Projects\IA\IADAL\IAController.cs:61 IA.IAForm.saveForm(Boolean validate) in C:\Projects\IA\IA\IAForm.aspx.cs:198 IA.IAForm.advance_Click(Object sender, EventArgs e) in C:\Projects\IA\IA\IAForm.aspx.cs:287 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5019

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  • Disable Days in Jquery FullCalendar

    - by user297561
    I'm using FullCalendar as a large date picker with added features, and need to disable all Sundays and various other days throughout the year. Jquery UI date picker allows you to create methods for disabling dates. Is there a similar setup for FullCalendar?

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  • The remote server returned an unexpected response: (413) Request Entity Too Large

    - by user1583591
    If anyone can help me figure out why I am getting the following error when making a call to my WCF service I would be eternally grateful. The maximum message size quota for incoming messages (65536) has been exceeded. To increase the quota, use the MaxReceivedMessageSize property on the appropriate binding element. I have tried modifying the config file on both the service and client, and made sure the service name includes the namespace. I cannt seem to make any progress. Here is my service config settings: <services> <service name="CCC.CA-CP &amp; Sightlines Campus Carbon Calculator"> <endpoint address="" binding="basicHttpBinding" bindingConfiguration="Binding2" contract="CCC.ICCCService" behaviorConfiguration="WebBehavior2" /> </service> </services> <bindings> <basicHttpBinding> <binding name="Binding2" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="2147483647" maxBufferPoolSize="52428800" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="16384" maxBytesPerRead="20000" maxNameTableCharCount="16384" ></readerQuotas> </binding> </basicHttpBinding> </bindings> .. <dataContractSerializer maxItemsInObjectGraph="12097151" /> ... <requestLimits maxAllowedContentLength="157286400" /> ... <httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="2147483647"... I also set the client config with the same binding values. Here is the service contract : namespace CCC { [ServiceContract(Name = "CA-CP & Sightlines Campus Carbon Calculator", Namespace = "http://www.sightlines.com/CCC/01")] public interface ICCCService { .... } Thanks in advance for any help given!

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  • iPhone NSDate - get time in milliseconds and store in coredata

    - by satyam
    I'm implementing iphone app with coredata functionality. I've an attribute in entity "NSDate" which stores the date and time when the record is added. I'm adding records at a faster rate. About 1 record per 25 milli seconds I want to store the date along with milli seconds so that I can retrieve the data in descending order. How can I do this?

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  • Customization for VersionDiff.aspx in sharepoint

    - by Azra
    Hi. I have a Wiki site, and on wiki pages if I select to check history of pages it displays in the Left action panel Version and date as hyperlinks. It uses SharePoint's Diff iterator, I want to do a bit of customization here, along with date I want to display field values too. How can I do that? Thanks, Azra

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  • VBA text box input mask

    - by Jaison
    I have two validation for date and time as below in text boxes: 00/00\ 00:00;0;0;_ It will take (dd/mm hh:mm) and works fine But sometimes i put 34/34 56:78 it will take , But it shouldn't Date sholdnot go beyond 31, month 12 time 24 and minute 59 Please help

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  • jQuery load Google Visualization API with AJAX

    - by Curro
    Hello. There is an issue that I cannot solve, I've been looking a lot in the internet but found nothing. I have this JavaScript that is used to do an Ajax request by PHP. When the request is done, it calls a function that uses the Google Visualization API to draw an annotatedtimeline to present the data. The script works great without AJAX, if I do everything inline it works great, but when I try to do it with AJAX it doesn't work!!! The error that I get is in the declaration of the "data" DataTable, in the Google Chrome Developer Tools I get a Uncaught TypeError: Cannot read property 'DataTable' of undefined. When the script gets to the error, everything on the page is cleared, it just shows a blank page. So I don't know how to make it work. Please help Thanks in advance $(document).ready(function(){ // Get TIER1Tickets $("#divTendency").addClass("loading"); $.ajax({ type: "POST", url: "getTIER1Tickets.php", data: "", success: function(html){ // Succesful, load visualization API and send data google.load('visualization', '1', {'packages': ['annotatedtimeline']}); google.setOnLoadCallback(drawData(html)); } }); }); function drawData(response){ $("#divTendency").removeClass("loading"); // Data comes from PHP like: <CSV ticket count for each day>*<CSV dates for ticket counts>*<total number of days counted> // So it has to be split first by * then by , var dataArray = response.split("*"); var dataTickets = dataArray[0]; var dataDates = dataArray[1]; var dataCount = dataArray[2]; // The comma separation now splits the ticket counts and the dates var dataTicketArray = dataTickets.split(","); var dataDatesArray = dataDates.split(","); // Visualization data var data = new google.visualization.DataTable(); data.addColumn('date', 'Date'); data.addColumn('number', 'Tickets'); data.addRows(dataCount); var dateSplit = new Array(); for(var i = 0 ; i < dataCount ; i++){ // Separating the data because must be entered as "new Date(YYYY,M,D)" dateSplit = dataDatesArray[i].split("-"); data.setValue(i, 0, new Date(dateSplit[2],dateSplit[1],dateSplit[0])); data.setValue(i, 1, parseInt(dataTicketArray[i])); } var annotatedtimeline = new google.visualization.AnnotatedTimeLine(document.getElementById('divTendency')); annotatedtimeline.draw(data, {displayAnnotations: true}); }

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  • Julian day of the year in Java

    - by Mark
    I have seen the "solution" at http://www.rgagnon.com/javadetails/java-0506.html, but it doesn't work correctly. E.g. yesterday (June 8) should have been 159, but it said it was 245. So, does someone have a solution in Java for getting the current date's three digit Julian day (not Julian date - I need the day this year)? Thanks! Mark

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  • Convert and convert back datetime in Django

    - by Anshuma
    I am parsing feeds using feedparser and I am trying to store updated or updated_parsed attributes of feeds in Django db. But it shows an error as [u'Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.'] Please tell me how to convert updated and updated_parsed such that it can be stored in the Django db such that I can (convert and reuse) or just reuse the date stored in db while parsing in this way: feedparser.parse("url", modified = lastupdate)

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  • .NET Get timezone offset by timezone name

    - by Daniil Harik
    Hello, In database I store all date/times in UTC. I know user's timezone name ("US Eastern Standard Time" for example). In order to display correct time I was thinking that I need to add user's timezone offset to UTC date/time. But how would I get timezone offset by timezone name? Thank You!

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  • mysql query is producing more results than it should

    - by user253530
    SELECT S.CLIENT,S.IP_DOMAIN as IP, IFNULL(K.DATE, DATE '0000-00-00') AS RecentDate FROM PLD_SERVERS AS S JOIN PLD_SEARCHES AS K ON S.ID = K.SERVER_ID This query will produce as many results as entries in the PLD_SEARCHES. For example: I have 3 entries in PLD_SERVERS and 18 entries in PLD_SEARCHES. The output of this query will be 18 but i need it to be 3 (as the number of PLD_SERVERS entries) with the recent date as a join field from PLD_SEARCHES.

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  • what does calling ´this´ outside of a jquery plugin refer to

    - by Richard
    Hi, I am using the liveTwitter plugin The problem is that I need to stop the plugin from hitting the Twitter api. According to the documentation I need to do this $("#tab1 .container_twitter_status").each(function(){ this.twitter.stop(); }); Already, the each does not make sense on an id and what does this refer to? Anyway, I get an undefined error. I will paste the plugin code and hope it makes sense to somebody MY only problem thusfar with this plugin is that I need to be able to stop it. thanks in advance, Richard /* * jQuery LiveTwitter 1.5.0 * - Live updating Twitter plugin for jQuery * * Copyright (c) 2009-2010 Inge Jørgensen (elektronaut.no) * Licensed under the MIT license (MIT-LICENSE.txt) * * $Date: 2010/05/30$ */ /* * Usage example: * $("#twitterSearch").liveTwitter('bacon', {limit: 10, rate: 15000}); */ (function($){ if(!$.fn.reverse){ $.fn.reverse = function() { return this.pushStack(this.get().reverse(), arguments); }; } $.fn.liveTwitter = function(query, options, callback){ var domNode = this; $(this).each(function(){ var settings = {}; // Handle changing of options if(this.twitter) { settings = jQuery.extend(this.twitter.settings, options); this.twitter.settings = settings; if(query) { this.twitter.query = query; } this.twitter.limit = settings.limit; this.twitter.mode = settings.mode; if(this.twitter.interval){ this.twitter.refresh(); } if(callback){ this.twitter.callback = callback; } // ..or create a new twitter object } else { // Extend settings with the defaults settings = jQuery.extend({ mode: 'search', // Mode, valid options are: 'search', 'user_timeline' rate: 15000, // Refresh rate in ms limit: 10, // Limit number of results refresh: true }, options); // Default setting for showAuthor if not provided if(typeof settings.showAuthor == "undefined"){ settings.showAuthor = (settings.mode == 'user_timeline') ? false : true; } // Set up a dummy function for the Twitter API callback if(!window.twitter_callback){ window.twitter_callback = function(){return true;}; } this.twitter = { settings: settings, query: query, limit: settings.limit, mode: settings.mode, interval: false, container: this, lastTimeStamp: 0, callback: callback, // Convert the time stamp to a more human readable format relativeTime: function(timeString){ var parsedDate = Date.parse(timeString); var delta = (Date.parse(Date()) - parsedDate) / 1000; var r = ''; if (delta < 60) { r = delta + ' seconds ago'; } else if(delta < 120) { r = 'a minute ago'; } else if(delta < (45*60)) { r = (parseInt(delta / 60, 10)).toString() + ' minutes ago'; } else if(delta < (90*60)) { r = 'an hour ago'; } else if(delta < (24*60*60)) { r = '' + (parseInt(delta / 3600, 10)).toString() + ' hours ago'; } else if(delta < (48*60*60)) { r = 'a day ago'; } else { r = (parseInt(delta / 86400, 10)).toString() + ' days ago'; } return r; }, // Update the timestamps in realtime refreshTime: function() { var twitter = this; $(twitter.container).find('span.time').each(function(){ $(this).html(twitter.relativeTime(this.timeStamp)); }); }, // Handle reloading refresh: function(initialize){ var twitter = this; if(this.settings.refresh || initialize) { var url = ''; var params = {}; if(twitter.mode == 'search'){ params.q = this.query; if(this.settings.geocode){ params.geocode = this.settings.geocode; } if(this.settings.lang){ params.lang = this.settings.lang; } if(this.settings.rpp){ params.rpp = this.settings.rpp; } else { params.rpp = this.settings.limit; } // Convert params to string var paramsString = []; for(var param in params){ if(params.hasOwnProperty(param)){ paramsString[paramsString.length] = param + '=' + encodeURIComponent(params[param]); } } paramsString = paramsString.join("&"); url = "http://search.twitter.com/search.json?"+paramsString+"&callback=?"; } else if(twitter.mode == 'user_timeline') { url = "http://api.twitter.com/1/statuses/user_timeline/"+encodeURIComponent(this.query)+".json?count="+twitter.limit+"&callback=?"; } else if(twitter.mode == 'list') { var username = encodeURIComponent(this.query.user); var listname = encodeURIComponent(this.query.list); url = "http://api.twitter.com/1/"+username+"/lists/"+listname+"/statuses.json?per_page="+twitter.limit+"&callback=?"; } $.getJSON(url, function(json) { var results = null; if(twitter.mode == 'search'){ results = json.results; } else { results = json; } var newTweets = 0; $(results).reverse().each(function(){ var screen_name = ''; var profile_image_url = ''; if(twitter.mode == 'search') { screen_name = this.from_user; profile_image_url = this.profile_image_url; created_at_date = this.created_at; } else { screen_name = this.user.screen_name; profile_image_url = this.user.profile_image_url; // Fix for IE created_at_date = this.created_at.replace(/^(\w+)\s(\w+)\s(\d+)(.*)(\s\d+)$/, "$1, $3 $2$5$4"); } var userInfo = this.user; var linkified_text = this.text.replace(/[A-Za-z]+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&\?\/.=]+/, function(m) { return m.link(m); }); linkified_text = linkified_text.replace(/@[A-Za-z0-9_]+/g, function(u){return u.link('http://twitter.com/'+u.replace(/^@/,''));}); linkified_text = linkified_text.replace(/#[A-Za-z0-9_\-]+/g, function(u){return u.link('http://search.twitter.com/search?q='+u.replace(/^#/,'%23'));}); if(!twitter.settings.filter || twitter.settings.filter(this)) { if(Date.parse(created_at_date) > twitter.lastTimeStamp) { newTweets += 1; var tweetHTML = '<div class="tweet tweet-'+this.id+'">'; if(twitter.settings.showAuthor) { tweetHTML += '<img width="24" height="24" src="'+profile_image_url+'" />' + '<p class="text"><span class="username"><a href="http://twitter.com/'+screen_name+'">'+screen_name+'</a>:</span> '; } else { tweetHTML += '<p class="text"> '; } tweetHTML += linkified_text + ' <span class="time">'+twitter.relativeTime(created_at_date)+'</span>' + '</p>' + '</div>'; $(twitter.container).prepend(tweetHTML); var timeStamp = created_at_date; $(twitter.container).find('span.time:first').each(function(){ this.timeStamp = timeStamp; }); if(!initialize) { $(twitter.container).find('.tweet-'+this.id).hide().fadeIn(); } twitter.lastTimeStamp = Date.parse(created_at_date); } } }); if(newTweets > 0) { // Limit number of entries $(twitter.container).find('div.tweet:gt('+(twitter.limit-1)+')').remove(); // Run callback if(twitter.callback){ twitter.callback(domNode, newTweets); } // Trigger event $(domNode).trigger('tweets'); } }); } }, start: function(){ var twitter = this; if(!this.interval){ this.interval = setInterval(function(){twitter.refresh();}, twitter.settings.rate); this.refresh(true); } }, stop: function(){ if(this.interval){ clearInterval(this.interval); this.interval = false; } } }; var twitter = this.twitter; this.timeInterval = setInterval(function(){twitter.refreshTime();}, 5000); this.twitter.start(); } }); return this; }; })(jQuery);

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  • Linq-to-SQL Grouping not ordering correctly

    - by Grant
    Hi can someone help me convert this tsql statement into c# linq2sql? select [series] from table group by [series] order by max([date]) desc This is what i have so far - the list is not in correct order.. var x = from c in db.Table orderby c.Date descending group c by c.Series into d select d.Key;

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  • create a YYYY-MM-DD Daterange in JScript/Javascript.

    - by Marcus
    Hello. I need no generate a full daterange in JScript from a given Startdate to now. Startdate: 2010-03-25 2010-03-26 2010-03-27 ... 2010-05-30 I am very confused with Javascript Date. best would be a function to give a daterange as params and getting an Array of the formatted date back, something like that: range[0] = 2010-03-25 range[1] = 2010-03-26 range[2] = 2010-03-27 ... range[x] = 2010-05-30 I am so confused thanks for any hint marcus

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  • Seeking for faster $.(':data(key)')

    - by PoltoS
    I'm writing an extension to jQuery that adds data to DOM elements using el.data('lalala', my_data); and then uses that data to upload elements dynamically. Each time I get new data from the server I need to update all elements having el.data('lalala') != null; To get all needed elements I use an extension by James Padolsey: $(':data(lalala)').each(...); Everything was great until I came to the situation where I need to run that code 50 times - it is very slow! It takes about 8 seconds to execute on my page with 3640 DOM elements var x, t = (new Date).getTime(); for (n=0; n < 50; n++) { jQuery(':data(lalala)').each(function() { x++; }); }; console.log(((new Date).getTime()-t)/1000); Since I don't need RegExp as parameter of :data selector I've tried to replace this by var x, t = (new Date).getTime(); for (n=0; n < 50; n++) { jQuery('*').each(function() { if ($(this).data('lalala')) x++; }); }; console.log(((new Date).getTime()-t)/1000); This code is faster (5 sec), but I want get more. Q Are there any faster way to get all elements with this data key? In fact, I can keep an array with all elements I need, since I execute .data('key') in my module. Checking 100 elements having the desired .data('lalala') is better then checking 3640 :) So the solution would be like for (i in elements) { el = elements[i]; .... But sometimes elements are removed from the page (using jQuery .remove()). Both solutions described above [$(':data(lalala)') solution and if ($(this).data('lalala'))] will skip removed items (as I need), while the solution with array will still point to removed element (in fact, the element would not be really deleted - it will only be deleted from the DOM tree - because my array will still have a reference). I found that .remove() also removes data from the node, so my solution will change into var toRemove = []; for (vari in elements) { var el = elements[i]; if ($(el).data('lalala')) .... else toRemove.push(i); }; for (var ii in toRemove) elements.splice(toRemove[ii], 1); // remove element from array This solution is 100 times faster! Q Will the garbage collector release memory taken by DOM elements when deleted from that array? Remember, elements have been referenced by DOM tree, we made a new reference in our array, then removed with .remove() and then removed from the array. Is there a better way to do this?

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  • Changing timezone in MSYS

    - by d9k
    Hello, how can I change timezone on MSYS+MinGW for Windows if I have only "date" command installed? There are no "tzconfig" or "tzselect" here. When I try $date --set="Apr 01 23:08 UTC+04:00" I receive 19:08 GMT+0 resul. This is very important for me because "make" command always gives me errors about files modified in future.

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  • When using SendKeys()-InvalidOperationException: Undo Operation encountered...

    - by M0DC0M
    Here is my code public void KeyPress() { //Finds the target window and sends a key command to the application Process[] processes = Process.GetProcessesByName("calc"); IntPtr calculatorHandle; foreach (Process proc in processes) { calculatorHandle = proc.MainWindowHandle; if (calculatorHandle == IntPtr.Zero) { MessageBox.Show("Calculator is not running."); return; } SetForegroundWindow(calculatorHandle); break; } SendKeys.SendWait("1"); } After Executing this code I recieve an Error, i know the source is the SendKeys. Here is the full error I am Receiving System.InvalidOperationException was unhandled Message="The Undo operation encountered a context that is different from what was applied in the corresponding Set operation. The possible cause is that a context was Set on the thread and not reverted(undone)." Source="mscorlib" StackTrace: at System.Threading.SynchronizationContextSwitcher.Undo() at System.Threading.ExecutionContextSwitcher.Undo() at System.Threading.ExecutionContext.runFinallyCode(Object userData, Boolean exceptionThrown) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteBackoutCodeHelper(Object backoutCode, Object userData, Boolean exceptionThrown) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.ContextAwareResult.Complete(IntPtr userToken) at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken) at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) InnerException: I'm not sure what the problem is, The number will appear in my calculator but that error pops up

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  • Solving embarassingly parallel problems using Python multiprocessing

    - by gotgenes
    How does one use multiprocessing to tackle embarrassingly parallel problems? Embarassingly parallel problems typically consist of three basic parts: Read input data (from a file, database, tcp connection, etc.). Run calculations on the input data, where each calculation is independent of any other calculation. Write results of calculations (to a file, database, tcp connection, etc.). We can parallelize the program in two dimensions: Part 2 can run on multiple cores, since each calculation is independent; order of processing doesn't matter. Each part can run independently. Part 1 can place data on an input queue, part 2 can pull data off the input queue and put results onto an output queue, and part 3 can pull results off the output queue and write them out. This seems a most basic pattern in concurrent programming, but I am still lost in trying to solve it, so let's write a canonical example to illustrate how this is done using multiprocessing. Here is the example problem: Given a CSV file with rows of integers as input, compute their sums. Separate the problem into three parts, which can all run in parallel: Process the input file into raw data (lists/iterables of integers) Calculate the sums of the data, in parallel Output the sums Below is traditional, single-process bound Python program which solves these three tasks: #!/usr/bin/env python # -*- coding: UTF-8 -*- # basicsums.py """A program that reads integer values from a CSV file and writes out their sums to another CSV file. """ import csv import optparse import sys def make_cli_parser(): """Make the command line interface parser.""" usage = "\n\n".join(["python %prog INPUT_CSV OUTPUT_CSV", __doc__, """ ARGUMENTS: INPUT_CSV: an input CSV file with rows of numbers OUTPUT_CSV: an output file that will contain the sums\ """]) cli_parser = optparse.OptionParser(usage) return cli_parser def parse_input_csv(csvfile): """Parses the input CSV and yields tuples with the index of the row as the first element, and the integers of the row as the second element. The index is zero-index based. :Parameters: - `csvfile`: a `csv.reader` instance """ for i, row in enumerate(csvfile): row = [int(entry) for entry in row] yield i, row def sum_rows(rows): """Yields a tuple with the index of each input list of integers as the first element, and the sum of the list of integers as the second element. The index is zero-index based. :Parameters: - `rows`: an iterable of tuples, with the index of the original row as the first element, and a list of integers as the second element """ for i, row in rows: yield i, sum(row) def write_results(csvfile, results): """Writes a series of results to an outfile, where the first column is the index of the original row of data, and the second column is the result of the calculation. The index is zero-index based. :Parameters: - `csvfile`: a `csv.writer` instance to which to write results - `results`: an iterable of tuples, with the index (zero-based) of the original row as the first element, and the calculated result from that row as the second element """ for result_row in results: csvfile.writerow(result_row) def main(argv): cli_parser = make_cli_parser() opts, args = cli_parser.parse_args(argv) if len(args) != 2: cli_parser.error("Please provide an input file and output file.") infile = open(args[0]) in_csvfile = csv.reader(infile) outfile = open(args[1], 'w') out_csvfile = csv.writer(outfile) # gets an iterable of rows that's not yet evaluated input_rows = parse_input_csv(in_csvfile) # sends the rows iterable to sum_rows() for results iterable, but # still not evaluated result_rows = sum_rows(input_rows) # finally evaluation takes place as a chain in write_results() write_results(out_csvfile, result_rows) infile.close() outfile.close() if __name__ == '__main__': main(sys.argv[1:]) Let's take this program and rewrite it to use multiprocessing to parallelize the three parts outlined above. Below is a skeleton of this new, parallelized program, that needs to be fleshed out to address the parts in the comments: #!/usr/bin/env python # -*- coding: UTF-8 -*- # multiproc_sums.py """A program that reads integer values from a CSV file and writes out their sums to another CSV file, using multiple processes if desired. """ import csv import multiprocessing import optparse import sys NUM_PROCS = multiprocessing.cpu_count() def make_cli_parser(): """Make the command line interface parser.""" usage = "\n\n".join(["python %prog INPUT_CSV OUTPUT_CSV", __doc__, """ ARGUMENTS: INPUT_CSV: an input CSV file with rows of numbers OUTPUT_CSV: an output file that will contain the sums\ """]) cli_parser = optparse.OptionParser(usage) cli_parser.add_option('-n', '--numprocs', type='int', default=NUM_PROCS, help="Number of processes to launch [DEFAULT: %default]") return cli_parser def main(argv): cli_parser = make_cli_parser() opts, args = cli_parser.parse_args(argv) if len(args) != 2: cli_parser.error("Please provide an input file and output file.") infile = open(args[0]) in_csvfile = csv.reader(infile) outfile = open(args[1], 'w') out_csvfile = csv.writer(outfile) # Parse the input file and add the parsed data to a queue for # processing, possibly chunking to decrease communication between # processes. # Process the parsed data as soon as any (chunks) appear on the # queue, using as many processes as allotted by the user # (opts.numprocs); place results on a queue for output. # # Terminate processes when the parser stops putting data in the # input queue. # Write the results to disk as soon as they appear on the output # queue. # Ensure all child processes have terminated. # Clean up files. infile.close() outfile.close() if __name__ == '__main__': main(sys.argv[1:]) These pieces of code, as well as another piece of code that can generate example CSV files for testing purposes, can be found on github. I would appreciate any insight here as to how you concurrency gurus would approach this problem. Here are some questions I had when thinking about this problem. Bonus points for addressing any/all: Should I have child processes for reading in the data and placing it into the queue, or can the main process do this without blocking until all input is read? Likewise, should I have a child process for writing the results out from the processed queue, or can the main process do this without having to wait for all the results? Should I use a processes pool for the sum operations? If yes, what method do I call on the pool to get it to start processing the results coming into the input queue, without blocking the input and output processes, too? apply_async()? map_async()? imap()? imap_unordered()? Suppose we didn't need to siphon off the input and output queues as data entered them, but could wait until all input was parsed and all results were calculated (e.g., because we know all the input and output will fit in system memory). Should we change the algorithm in any way (e.g., not run any processes concurrently with I/O)?

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  • Compare dates in java

    - by c0mrade
    How to compare dates in between in java? Example: date1 is 22-02-2010 date2 is 07-04-2010 today date3 is 25-12-2010 date3 is always greater than date1 and date2 is always today. I forgot the main point, how to verify if today's date is in between date1 and date 3?

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  • UIDatePicker hours are disabled

    - by user112175
    I have a UIDatePicker object and I am setting it up as follows but for some reason my hours field is disabled on the current date but minutes are not. Not exactly sure what I am missing, any help would be appreciated. UIDatePicker *picker = [[UIDatePicker alloc] init]; picker.date = [NSDate dateWithTimeIntervalSinceNow:DATE_MIN_SECONDS_OFFSET]; picker.minimumDate = [NSDate dateWithTimeIntervalSinceNow:DATE_MIN_SECONDS_OFFSET]; This is what My datepicker looks like http://img.skitch.com/20100417-d75gq78pjwjb9d37ku9msmcduc.png

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  • how to pass datetime in session value to next page

    - by SmartDev
    Hi , I have textbox which is a date field . i need to store that in a session and pass that value to another page . im using sessions for that . can anyone tell how to convert it to date time and pass in a session . Example: Session["startdate"] = Convert.ToDateTime(textbox1.Text); is this the rite way. Thanks Sachin

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  • What do you expect from a package manager for Emacs

    - by tarsius
    Although several hundred Emacs Lisp libraries exist GNU Emacs does not have an (internal) package manager. I guess that most users would agree that it is currently rather inconvenient to find, install and especially keep up-to-date Emacs Lisp libraries. These pages make life a bit easier Emacs Lisp List - Problem: I see dead people (links). Emacswiki - Problem: May contain traces of nuts (malicious code). These are some package managers XEmacs package manager package.el - ELPA pases install.el install-elisp.el plugin.el use-package.el jem-pkg.el epkg/elm - the one I am working. And this are some packages that provide functionality that might be useful in a package manager ell.el - Browse the Emacs Lisp List genauto.el - helps generate autoloads for your elisp packages date-calc.el - date calculation and parsing routines strptime.el - partial implementation of POSIX date and time parsing wikirel.el - Visit relevant pages on the Emacs Wiki loadhist.el, lib-requires.el, elisp-depend.el - Commands to list Emacs Lisp library dependencies. project-root.el - Define a project root and take actions based upon it So I would like to know from you what you consider important/unimportant/supplementary... in a package manager for Emacs. Some ideas Many packages (incorporate the Emacs Lisp List and other lists of libraries). Only packages that have been tested. Support for more than one package archive (so people can choose between many/tested packages). Dependency calculated based on required features only. Dependencies take particular versions into account. Only use versions that have been released upstream. Use versions from version control systems if available. Packages are categorized. Packages can be uninstalled and updated not only installed. Support creating fork of upstream version of packages. Support publishing these forks. Support choosing a fork. After installation packages are activated. Generate autoloads. Integration with Emacswiki (see wikirel.el). Users can tag, comment ... packages and share that information. Only FSF-assigned/GPL/FOSS software or don't care about license. Package manager should be integrated in Emacs. Support contacting author. Lots of metadata. Suggest alternatives before installing a particular package. Some discussions about the subject at hand emacs-devel 20080801 comp.emacs 20021121 RationalElispPackaging I am hoping for these kinds of answers Pointers to more implementations, discussions etc. Lengthy descriptions of a set of features that make up your ideal package manager. Descriptions of one particular disired/undisired feature. This has the advantage that the regular voting mechanism allows us to see what features are most welcomed. Feel free to elaborate on my ideas from above. Surprise me.

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  • Regular expression help

    - by DJPB
    I there I'm working on a C# app, and I get a string with a date or part of a date and i need to take day, month and year for that string ex: string example='31-12-2010' string day = Regex.Match(example, "REGULAR EXPRESSION FOR DAY").ToString(); string month = Regex.Match(example, "REGULAR EXPRESSION FOR MONTH").ToString() string year = Regex.Match(example, "REGULAR EXPRESSION FOR YEAR").ToString() day = "31" month = "12" year = "2010" ex2: string example='12-2010' string month = Regex.Match(example, "REGULAR EXPRESSION FOR MONTH").ToString() string year = Regex.Match(example, "REGULAR EXPRESSION FOR YEAR").ToString() month = "12" year = "2010" any idea? tks

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