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• Smartest way to import massive datasets into a Rails application?

  - by williamjones

  I've got multiple massive (multi gigabyte) datasets I need to import into a Rails app. The datasets are currently each in their own database on my development machine, and I need to read from them and create rows in tables in my Rails database based on the information they contain. The tables in my Rails database will not be exactly the same as the tables in the source databases. What's the smartest way to go about this? I was thinking migrations, but I'm not exactly sure how to connect the migration to the databases, and even if that is possible, is that going to be ridiculously slow?

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• Paypal Payflow pro library

  - by John Stewart

  I already have an express checkout integrated with my Codeigniter application. Now I want to integrate seamless paypal where I collect the CC information and pass it to Paypal (via backend) and once everything is approved, my application shows that to the user. All this with out ever going to Paypal's website. I know that Paypal gives a bunch of sample code but they have so many different products that advertise to do the same thing. Is there any wrapper library in PHP that I can use for handling all this? What sort of design decision is involved in migrating to such system? Would I need SSL certificates for this?

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• C# Thread issues

  - by Mike

  What I have going on is a listview being dynamically created from a previous button click. Then ti starts a background worker in which should clear out the listview and populate the iistview with new information every 30 seconds. I continously get: Cross-thread operation not valid: Control 'listView2' accessed from a thread other than the thread it was created on. private void watcherprocess1Updatelist() { listView2.Items.Clear(); string betaFilePath1 = @"C:\Alpha\watch1\watch1config.txt"; using (FileStream fs = new FileStream(betaFilePath1, FileMode.Open)) using (StreamReader rdr = new StreamReader((fs))) { while (!rdr.EndOfStream) { string[] betaFileLine = rdr.ReadLine().Split(','); using (WebClient webClient = new WebClient()) { string urlstatelevel = betaFileLine[0]; string html = webClient.DownloadString(urlstatelevel); File.AppendAllText(@"C:\Alpha\watch1\specificconfig.txt", html); } } }

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• No component for supporting the service was found error

  - by Deepa

  We have setup a .net application developed with .net framework 4.0 using MVC framework and WCF service on a Windows 2003, 32-bit server containing IIS 6 successfully. However, when the same application is set up on a Win 2008 R2, 64-bit server, we get the following error when the application is accessing the WCF service: No component for supporting the service was found Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: Castle.MicroKernel.ComponentNotFoundException: No component for supporting the service was found We have set the flag for Enable 32-bit apps in "Application Pool" to true on the 64-bit server.

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• search engine (solr/sphinx) question

  - by noname

  i want to make my threads content searchable with full text search engines like solr. but i wonder one thing. should i index just the thread.title, thread.body and post.body or should i index username, created date, nr of posts, views, country, region and city too that belongs to thread? i mean when an user search for a thread he will get hits returned containing thread title, 2 lines of body, which user has posted it, creation date, tags, and so on. should i index all this information too? but then it would be pretty much the whole database. or should i just index the 3 first columns i mentioned for full text search. and another question. when an user post a new thread, then i have to immidiately tell solr to add that row? if im not, how would it be searchable?

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• How can I get the last-modified time with python3 urllib?

  - by Daenyth

  I'm porting over a program of mine from python2 to python3, and I'm hitting the following error: AttributeError: 'HTTPMessage' object has no attribute 'getdate' Here's the code: conn = urllib.request.urlopen(fileslist, timeout=30) last_modified = conn.info().getdate('last-modified') This section worked under python 2.7, and so far I haven't been able to find out the correct method to get this information in python 3.1. The full context is an update method. It pulls new files from a server down to its local database, but only if the file on the server is newer than the local file. If there's a smarter way to achieve this functionality than just comparing local and remote file timestamps, then I'm open to that as well.

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• Cache for large read only database recommendation

  - by paddydub

  I am building site on with Spring, Hibernate and Mysql. The mysql database contains information on coordinates and locations etc, it is never updated only queried. The database contains 15000 rows of coordinates and 48000 rows of coordinate connections. Every time a request is processed, the application needs to read all these coordinates which is taking approx 3-4 seconds. I would like to set up a cache, to allow quick access to the data. I'm researching memcached at the moment, can you please advise if this would be my best option?

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• Why first arg to execve() must be path to executable

  - by EBM

  I understand that execve() and family require the first argument of its argument array to be the same as the executable that is also pointed to by its first argument. That is, in this: execve(prog, args, env); args[0] will usually be the same as prog. But I can't seem to find information as to why this is. I also understand that executables (er, at least shell scripts) always have their calling path as the first argument when running, but I would think that the shell would do the work to put it there, and execve() would just call the executable using the path given in its first argument ("prog" from above), then passing the argument array ("args" from above) as one would on the command line.... i.e., I don't call scripts on the command line with a duplicate executable path in the args list.... /bin/ls /bin/ls /home/john Can someone explain?

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• Python: Count lines and differentiate between them

  - by Mister X

  I'm using an application that gives a timed output based on how many times something is done in a minute, and I wish to manually take the output (copy paste) and have my program, and I wish to count how many times each minute it is done. An example output is this: 13:48 An event happened. 13:48 Another event happened. 13:49 A new event happened. 13:49 A random event happened. 13:49 An event happened. So, the program would need to understand that 2 things happened at 13:48, and 3 at 13:49. I'm not sure how the information would be stored, but I need to average them after, to determine an average of how often it happens. Sorry for being so complicated!

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• Running Python code from Java program, shoudl i be doing this?

  - by Space Rocker

  i have a scenario where i draw a network and set all it's paraments on swing based gui, after that i have to translate this network into a python based script which another framework reads and realize this network in the form of virtual machines. As an example have look here: from mininet.topo import Topo, Node class MyTopo( Topo ): def *__init__*( self, enable_all = True ): super( MyTopo, self ).__init__() Host = 1 Switch = 2 self.add_node( Switch, Node( is_switch=True ) ) self.add_node( Host, Node( is_switch=False ) ) self.add_edge( Host, Switch ) self.enable_all() topos = { 'mytopo': ( lambda: MyTopo() ) } It simply connects a host to a switch and realize this topology on mininet framework. Now for now in order to realize the drawn network on java GUI here is what i am doing: I simply take the information from GUI and creates a new python file like the one above using java code and then run this file in mininet, which works fine somehow. I want to know, is this the correct and robust way how i am doing this or should i be looking further into java-python bridge like scenarios to be more effective or so as to say more professional.

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• Minimum OS version number, iPhone app

  - by Michael Frost

  Hi all I've built an iPhone app which is live in the app-store. When originally submitting the app it showed up in App Store as requiring iPhone OS 3.1.3. When later updating the app I made sure my settings in Xcode for the target for the app store build had the Base SDK version set to 3.1.3 and the Deployment Target version set to 3.0, however it still shows up in app store as requiring 3.1.3. From what I've understood the Deployment Target version is the one setting the requirement in app store? Or is there any information concerning this that I should have updated in iTunes Connect when submitting the updated app? Thanks, Michael

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• What preferred way to reconcile keyCode/charCode across browsers?

  - by Drew Turner

  Based on the properties of the keydown event I would like to ascertain what the current charCode are? Example. For the keydown event when the NumPad0, D0, and Colon key is pressed I would like to know what the associated charcode is. Currently I have a map that contains the charcode associated with that keyCode or use the current if charCode is not specified. keyCode = { Colon: 186, D0: 48, NumPad0: 96, }; charCodes = { 186: 59, 96: 48, }; shiftCharCodes = { 186: 58, 48: 41 }; Also in certain cases the keyCodes are different accross browsers? Example. The keydown event has different keyCode values across browsers. Colon Key (:/;) - keyCode is 59 on firefox - keyCode is 186 on IE/safari For more information http://www.quirksmode.org/js/keys.html

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• Which rdfa parser for java that supports currently used rdfa attributes?

  - by lennyks

  I am building an app in Java using Jena for semantic information scraping. I am looking for a RDFa parser that would allow me to correctly extract all the rdfa statements. Specifically, one that extracts info about namespaces used and presuming that rdfa tags are correct in the page produces correct triples, ones that distinguish between object and data properties. I went through all rdfa parsers from the site http://rdfa.info/wiki/Consume for Java. They all struggle to extract any rdfa statements and if they do not crash, Jena RDFa parser shows plenty of errors and then dies a terrible death, the data is of little use as it is incorrectly processed and generally mixed up. I am newbie in this area so please be gentle:) I was also thinking of using a library written in different language but then again I don't really know how to plug it into Java code. Any suggestions?

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• Get a font filename based on Font Name and Style (Bold/Italic)

  - by Brad

  This has been driving me crazy all day. I need to get a font filename (eg. Arial.ttf) based off of it's name (Arial in this case). The problem is, I am only supplied with the font name (Arial) and weather it's bold, italic or both. Using those pieces of information, I need to find the font file so I can use it for rendering. Some more examples: Calibri, Bold would resolve to calibrib.ttf Calibri, Italic would resolve to calibrii.ttf Any ideas on how I could achieve this in C++ (Win32)

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• Rails and jQuery - how do you get server-side validation errors to your view after an ajax request

  - by adam

  Ive searched this site but questions are usually regarding doing client-side validations or for different frameworks. I have a tasks list whose items can be edited inline. Upon submitting the inline edit form the item is updated all thanks to jQuery, ajax and rails. But I want to handle bad input from the user. HTML requests redisplay the view and errors are displayed thanks to rails helpers. But how do I insert that information after an ajax call? Heres my update method in my controller def update @task = Task.find(params[:id]) respond_to do |format| if @task.update_attributes(params[:task]) flash[:notice] = 'Task was successfully updated.' format.html { redirect_to(@task) } format.xml { head :ok } format.js else format.html { render :action => "edit" } format.xml { render :xml => @task.errors, :status => :unprocessable_entity } #format.js ...hmmm... either go to js.erb file or do stuff inline end end end

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• What is the best type to use for returning an image in my C# library project?

  - by Sergio Tapia

  I'm making a project that will scrap information about a movie and return all sorts of goodies. This will be a .dll that other developers will use in their projects. For example, if they want to set a pictureBox image to the movies poster, what would be the best way to handle my library returning the image? //Set the image to The Matrix poster. pictureBox1.Image = MyLibrary.GetPoster("The Matrix"); Should I return an Image? A Byte[] array?

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• Rails - how do you create a user index page like stack overflows with multiple tabs whilst keeping t

  - by adam

  On stackoverflow in the users profile area there are many tabs which all display differing information such as questions asked and graphs. Its the same view though and im wondering hows its best to achieve this in rails whilst keeping the controller skinny and logic in the view to a minimum. def index @user = current_user case params[:tab_selected] when "questions" @data = @user.questions when "answers" @sentences = @user.answers else @sentences = @user.questions end respond_to do |format| format.html # index.html.erb nd end but how do i process this in the index view without a load of if and else statments. And if questions and answers are presented differently whats the best way to go about this.

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• Simple Java question

  - by user322102

  Hi All I new to java so bare with me if this is a ridiculously simple question but I am curious about this method call which has {code} being taken in - see code below for an example in the method addSelectionListener. What is the purpose of this? I have been looking through docs for an explaination but cant seem to find what this practice is called never mind any useful information. setStatusLine.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { String message = "I would like to say hello to you."; if (pressed) { message = "Thank you for using me"; } setStatusLine(message); pressed = !pressed; } }); Thanks for any help or insights that can be offered

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• Sharepoint 2010, get the Distinct Values of a User Profile Property?

  - by Michael Stum

  Is there any way in SharePoint 2010 to get the Distinct values of a property accross all users? For example, I want a list of all Departments in the Profile Store. In SQL I can do SELECT DISTINCT(PropertyVal) FROM [ProfileDB].[dbo].[UserProfileValue] WHERE PropertyID = 14 but accessing the SQL Database is a big no-no of course, so I wonder if there is something in the object model? Note that accessing the User Information List on an SPSite is not good enough, as only a fraction of all users is in that list. I want to get it directly from the Profile Store.

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• UNC path to a folder on my local computer

  - by xt_20

  Hi all, What's the UNC path to a folder on my local computer, and how can I access it? I have tried: 1. Security for the folder -- set to Everyone Full Control (for now!) 2. Sharing permissions -- set to Everyone Full Control (for now!) I can see the folder in \, but can't go in ( is not accessible.) Error message: "You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access pernmissions. The network location cannot be reached. For information about network troubleshooting, see Windows Help." My computer is not connected to a network.

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• Indexing SET field

  - by Dienow

  I have two entities A and B. They are related with many to many relation. Entity A can be related up to 100 B entities. Entity B can be related up to 10000 A entities. I need quick way to select for example 30 A entities, that have relation with specified B entities, filtered and sorted by different attributes. Here how I see ideal solution: I put all information I know about A entities, including their relations with B entities into single row (Special table with SET field) then add all necessary indexes. The problem is that you can't use index while querying by SET field. What should I do? I can replace database with something different, if that'll help.

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• how i insert values from list of Data Grid View?

  - by Six fourty

  it show me this error Incorrect syntax near the keyword 'Select' to make to clear Employee ID in this case is FK in the table (Attendance detail) and the other thing is i am using Data Grid View from another table(Employee information) to Show the list of the staff in my form. then i want to transfer each selected cell value from Data Grid View to attendance detail table. 10q private void time_in_Click(object sender, EventArgs e) { employee_InformationDataGridView.SelectedCells[0].Style.ForeColor = Color.Green; time_in.Enabled = false; time_out.Enabled = true; con = new SqlConnection(GlobalClass.conn); con.Open(); SqlCommand cmd = new SqlCommand("Insert into Attendancedetail Values(" + "Select from EmployeeInformation(EmployeeID)" + ",'" + employee_InformationDataGridView.SelectedCells[0] + "','" + DateTime.Now.ToLongDateString() + "','" + null + "','" + null + "','" + DateTime.Now.ToLongTimeString() + "'," + null + ")", con); int i = cmd.ExecuteNonQuery(); MessageBox.Show(i.ToString() + " record inserted"); }

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• Loading non-RJS javascript via ajax in Rails

  - by David Smith

  I've written a rails module that generates some javascript for a google map. As the user makes changes on the webpage, I use observe_field to call back to the server to regenerate the map's javascript (without updating the whole page). I'm having trouble finding a good way to insert the new javascript into the page. I've tried <div id='my_div_1'>div1</div> <%= update_page_tag do |page| page.replace_html 'my_div_1', "<script>alert('hi');</script>" end %> but it seems that replace_html only works for non-script html. It chokes when the content includes the closing < /script tag. Additional information...here is a page that I think is the root of the problem. http://www.wwco.com/~wls/blog/2007/04/25/using-script-in-a-javascript-literal/

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• How can I disable a button in a JQuery dialog from a function?

  - by Draco

  Hi, I have a JQuery dialog that requires the user to enter certain information. In this form I have a "continue" button. I would like this "continue" button to only be enabled once all the fields have content in them else it will remain disabled. I wrote a function that is called everytime a field status has changed however I don't know how to enable and disable the dialog button from this function. Any ideas? Oops and I forgot to mention that these buttons were created as follows: $(function() { $("#dialog").dialog({ bgiframe: true, height: 'auto', width: 700, show: 'clip', hide: 'clip', modal: true, buttons: { 'Add to request list': function() { $(this).dialog('close'); $('form').submit(); }, 'Cancel': function() { $(this).dialog('close'); } } });

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• How to approach local database management via Flex/Air App

  - by Damon

  I am planning on using Flash Builder 4/Flex to write an AIR application which is primarily based around recording, storing and analyzing data. I'll be creating charts etc that need to update in almost real time. It's essential to me that the application be able to function without an internet connection so I need a local database of some variety, but I would also eventually like to build in online synchronization of the data where either database can be update each other based on newer information. Moreover, some type of encryption would definitely be welcome, and speed is a large concern With all that in mind, what is my best approach to try and avoid headaches down the road?

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