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  • Running a SQL query in rails

    - by Bharat
    Hello I have a rails application where I have to subtract 2 time stamps and display the result on the webpage I have used the following sql statement and I am getting the results. select (julianday(resolutions.created_at)-julianday(tickets.created_at))*24 from tickets,resolutions the value of tickets.created_at is 2010-04-05 18:59:02 which is a time stamp and value of resolutions.created_at is 2010-04-08 08:10:33 Now where do I put this sql so that I can be seen in my webpage. I tired it in the views page with the following but nothing showed up: <% @sql = "select (julianday(resolutions.created_at)-julianday(tickets.created_at))*24 from tickets,resolutions" %> <% @t=(ActiveRecord::Base.connection.execute(@sql)) %> So how do I display it on my webpage? when I perform the above I get the output printed on the webpage as 061.1919444389641(julianday(resolutions.created_at)-julianday(tickets.created_at))*2461.1919444389641 only 61.1919444389641 is supposed to be printed but the query statement is also getting printed.

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  • Why not all users can log in to a network computer by using <network computer name>/<user name> form

    - by Haris
    There is a file server in my office that is not connected to my office LAN. In this server there are folders that are shared. This server is connected to a switch and a wireless router. Everyone who wants to access this server uses wireless network connection. They log in to this server by providing user name and password registered to the server. Some people can log in to my office file server by providing user name in (the server name)/(user name) format, while other must use (the server IP address)/(user name) format. Why is it like this? I need everyone can access the file server by providing user name in (the server name)/(user name) format. I have tried to change the %SystemRoot%\system32\drivers\etc\hosts file, as some suggested, but it won't work. Any other suggestion?

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  • Machine Learning Algorithm for Parallel Nodes

    - by FreshCode
    I want to apply machine learning to a classification problem in a parallel environment. Several independent nodes, each with multiple on/off sensors, can communicate their sensor data with the goal of classifying an event defined by a heuristic, training data or both. Each peer will be measuring the same data from their unique perspective and will attempt to classify the result while taking into account that any neighbouring node (or its sensors or just the connection to the node) could be faulty. Nodes should function as equal peers and determine the most likely classification by communicating their results. Ultimately each node should make a decision based on their own sensor data and their peers' data. If it matters, false positives are OK (albeit undesirable) but false negatives are totally unacceptable. Given that each final classification will receive good or bad feedback, what would be an appropriate machine learning algorithm to approach this problem with if the nodes could communicate with each other to determine the most likely classification?

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  • Need a way for users to enter data while offline and re-submit it when back online

    - by crankharder
    As part of a larger webapp, I want to build functionality that allows a user to enter data while offline -- and then send that data back to my site when they have a connection again The parts that, to me, are missing ar Saving a certain set of data in their browser Saving a form that allows them to enter data using form from step#2 to update data from step#1 getting data out of the local data store and sending it back to the server I would like to keep this entirely within the browser, so... Does HTML5 meet some (or all) of those goals as it's currently implemented in webkit/ff3? If not,what technologies should I start looking into in order to accomplish all of the above.

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  • MSI installer custom action identity problem

    - by DkAngelito
    Hi, I'm creating a custom action that executes a script on a database. The problem is that the connectios uses intergrated security, so when I try to open the connection i get the error: Login Failed for user 'Domain\ComputerName$'. When i check the identity on the custom action (using System.Security.Principal.WindowsIdentity.GetCurrent()) I always get "NT AUTHORITY\SYSTEM" but I'm running the installer under my account which has enough privileges on the Database. How can I run the custom action under the real user runnig the msi file or solve this problem in any other way?

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  • Surgical slave reads for Ruby on Rails, mulitple databases.

    - by Daniel
    Greetings, I'm currently working on a multiple database rails application. I want to off load the SELECT queries on to the slave databases for only SOME of the databases or specific models. The issue is that in places, we swap out the current database connection and put in a different one for a short time; to load fixtures or to handle sharding. Does anyone have any recommendations on a ruby gem that 1. will split select/(sql writes) with a considerable amount of control. We want to handle just some models and we are looking for a neat surgical fix. 2. does not monkey around with activerecord. 3. is still being maintained. TIA -daniel

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  • Remove HTTP headers from a raw response

    - by Ed
    Let's say we make a request to a URL and get back the raw response, like this: HTTP/1.1 200 OK Date: Wed, 28 Apr 2010 14:39:13 GMT Expires: -1 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Set-Cookie: PREF=ID=e2bca72563dfffcc:TM=1272465553:LM=1272465553:S=ZN2zv8oxlFPT1BJG; expires=Fri, 27-Apr-2012 14:39:13 GMT; path=/; domain=.google.co.uk Server: gws X-XSS-Protection: 1; mode=block Connection: close <!doctype html><html><head>...</head><body>...</body></html> What would be the best way to remove the HTTP headers from the response in C#? With regexes? Parsing it into some kind of HTTPResponse object and using only the body? EDIT: I'm using SOCKS to make the request, that's why I get the raw response.

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  • [java] Efficiency of while(true) ServerSocket Listen

    - by Submerged
    I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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  • Using XPath to access comments a flat hierachy

    - by Sebastian
    I have a given XML document (structure can not be changed) and want to get the comments that are written above the nodes. The document looks like this: <!--Some comment here--> <attribute name="Title">Book A</attribute> <attribute name="Author"> <value>Joe Doe</value> <value>John Miller</value> </attribute> <!--Some comment here--> <attribute name="Code">1</attribute> So comments are optional, but if there is one, I want to get the comment above each attribute. Using /*/comment()[n] would give me comment n, but for n=2 I would naturally get the comment of the third attribute, so there is no connection between attributes and comments Any ideas? Thanks

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  • Get http status in Qt WebKit

    - by RR
    Hello all: What I would like to implement is 1 Using Qt's WebView(part of QtWebKit) to access some page. 2 Show specified html page if got HTTP 4xx, 5xx status (Ex HTTP 404, 500). 3 Also shows specified page when network connection is unavailable. For now, I had only done job 1... In job 2, how did I get http status from WebView ? In job 3, I'm looking about QUrl APIs now. Anyone have idea or expreience yet ?

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  • Eclipse 3.5.1 update error (HTTP 503)

    - by PiedPiper
    I'm trying to update Eclipse 5.3.1 (on Gentoo Linux) from the Galileo Discovery Site and I get this error message: Network connection problems encountered during search. Unable to access "http://download.eclipse.org/releases/galileo". Error accessing site stream. [Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd] Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd Error accessing site stream. [Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd] Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd It seems the 503 error code is intended to stop software from constantly downloading this file from w3.org. But how do I persuade Eclipse to stop requesting it?

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  • Strange Exception on getGeneratedKeys() with JDBC for MySQL 5.1

    - by sweeney
    Hello, I'm using JDBC to insert a row into a MYSQL database. I build a parameterized command, execute it and attempt to retrieve the auto generated keys as follows: String sql = "INSERT IGNORE INTO `users` (`email`, `pass-hash`) VALUES (?, ?)"; Connection conn = SQLAccess.getConnection(); PreparedStatement ps = conn.prepareStatement(sql); ps.setString(1, login); ps.setString(2, passHash); int count = ps.executeUpdate(); if (count == 1) { ResultSet rs = ps.getGeneratedKeys(); rs.next(); //some more stuff... } For some reason, I get the following SQLException on the line containing ResultSet rs = ps.getGeneratedKeys();: !Statement.Generated Keys Not Requested! Any thoughts? When I run the same query, as generated by running the app through the debugger, in a MySQL browser it executes without incident. Thanks, brian

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  • questions about multi threading for sockets/tcp-connections.

    - by Fantastic Fourier
    I have a server that connects to multiple clients using TCP/IP connections, using C in Unix. Since it won't have more than 20 connections at a time, I figured I would use a thread per connection/socket. But the problem is writing to the sockets as I'll be sending user prompted msgs to clients. Once each socket is handled by a thread, how do I interact with the created thread to write to the sockets? Should each thread just read from the sockets and I'll write to sockets in the main program? Not sure if that's a good way to go about it.

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  • When binding a client TCP socket to a specific local port with Winsock, SO_REUSEADDR does not have a

    - by Checkers
    I'm binding a client TCP socket to a specific local port. To handle the situation where the socket remains in TIME_WAIT state for some time, I use setsockopt() with SO_REUSEADDR on a socket. It works on Linux, but does not work on Windows, I get WSAEADDRINUSE on connect() call when the previous connection is still in TIME_WAIT. MSDN is not exactly clear what should happen with client sockets: [...] For server applications that need to bind multiple sockets to the same port number, consider using setsockopt (SO_REUSEADDR). Client applications usually need not call bind at all—connect chooses an unused port automatically. [...] How do I avoid this?

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  • How to convert Facebook created_time to Java Date?

    - by smitty
    Hi, I have a FQL statement like this: String query = "SELECT post_id, actor_id, target_id, created_time, message FROM stream WHERE source_id in (SELECT target_id FROM connection WHERE source_id=<userID>) AND is_hidden = 0"; I just wondering what kind of time Facebook gives to me. The result of my statement will be mapped to a wrapper object (wallpost). myDate.setTime(wallpost.getCreated_time()); gives me no valid date. Does anyone have an idea what kind of date Facebook returns and how to match it to Date()? thanks in advance!

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  • java I/O is blocked while reading on socket when i put off the battery from device.

    - by gunjan goyal
    hi, i m working on client socket connection. client is a GPRS hardware device. i m receiving request from this client on my serversocket and then opening multiple threads. my problem is that when device/client close the socket then my IO detects that throws an exception but when i put off the battery from the device while sending the request to the serversocket it is blocked without throwing any exception. please help me out. thanks in advance. this is my code. try { while ((len = inputStream.read(mainBuffer)) -1) { System.out.println("len= " + len); }//end of while System.out.println("out of while loop");//which is never printed on screen. } catch (IOException e) { e.printStackTrace(); } regards gunjan goyal

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  • DBMS for POS software

    - by Andrew Smith
    Hello, I want to develop a POS application in .NET (C#) that would be used to rent items. I have a good idea of what will be done and the famous question that I have is about the DBMS that I should use. I would like to use MySQL database. The question is: If some places use only one computer (no network, no internet connection), can I use a MySQL database in local? Do I need to install MySQL server on all thoses computers to be able to use such a database? I know SQLite but I'm not sure if the limitations can cause problems in the future... I also looked at SQLServer Express versions. (I must consider that other point of sales are using multiple computers and more transactions so there I can't put sqlexpress or sqlite) So can anybody suggest me what I should do in that situation? Thanks

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  • Using comet with PHP?

    - by ryeguy
    I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet: My understanding is that PHP is a terrible language for Comet, because Comet requires you to keep a persistent connection open to each browser client. Using mod_php this means tying up an Apache child full-time for each client which doesn’t scale at all. The people I know doing Comet stuff are mostly using Twisted Python which is designed to handle hundreds or thousands of simultaneous connections. Is this true? Or is it something that can be configured around?

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  • How to use AIR 2.0 NativeProcess API with Java?

    - by dede
    How do you use this great new API in connection with Java? Do you use just pure native process API like nativeProcess.standardInput.write() and nativeProcess.standardOutput.read() with which you cannot debug Java side neither invoke remote java method. Or you are using some library that leverages remote method invocation such as flerry lib but that also cannot debug Java side? Or maybe you are using Merapi with which you can debug but cannot remotely invoke Java method? I'm asking this because this is maybe the most important question regarding this API and its ease of use.

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  • Java basic authorization with URLConnection

    - by zigomir
    Hello! I'm opening a connection to WebService with an URLConnection class. I also set request property for basic authorization like this: c.setRequestProperty("Authorization", "Basic " + usernameAndPasswordEncoded); Where c is an object of type URLConnection. So this is client side of WebService call. Now on server side I need to get username from session: User user = (User) request.getSession().getAttribute("user"); But this won't get an username. Also if I look through debug mode, I see an anonymous userName in HttpSession object. What to do to solve this problem, so that username is sent through client to WebService server for authorization? Thanks everyone!

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  • Testing install procedure of a program requiring administrative privileges

    - by Lucas Meijer
    I'm trying to write automated test, to ensure that the installer for my program works okay. The program can be installed for all users (requires admin privs), or for current user (does not require admin privs). The program can also autoupdate itself, which in some cases requires admin privileges, and in some cases doesn't. I'm looking for a way where I can have an automated test click "Yes, Allow" on the UAC dialogs, so I can write tests for all different scenarios, on many different operating systems, so that I can be confident when I make changes to the installer that I didn't break anything. Obviously, the installer process itself cannot do this. However, I control the complete machine, and could easily start some sort of daemon process with administrative rights, that the testprogram could make a socket connection to, to request it to "please click ok on the UAC now".

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  • NSURLConnection on simulator and iphone performance issues

    - by Nava Carmon
    I'm experiencing a weird problem and i wonder if anybody else has noticed this: I'm using NSURLConnection as it appears in apple's examples to get xml files from a certain server - pretty straight forward. And most of time it works, but sometimes it's just stuck after initialing and don't get into connection's delegate methods. I'm working with WiFi & 3G and the same server all the time. When it comes to didFailWithError i see that mostly it was a timeout error. When I enter same link in Safari it takes a second to bring data. And after another trial I can access the link. What might be the reason for such a weird behavior? How can I improve it? What is the role of cache policy with NSURLConnection? Thanks, Nava

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  • PASS: Board Q&amp;A at the Summit

    - by Bill Graziano
    The last two years we’ve put the Board in front of the members and taken questions.  We’re going to do that again this year.  It will be in Room 307/308 from 12:15 to 1:30 on Friday. Yes, this time overlaps with the Birds of a Feather Lunch and the start of afternoon sessions – but only partially.  You can attend the Q&A and still get to parts of both of those.  There just isn’t a great time to do this.  Every time overlaps with something. We can’t do it after the last session on Friday.  We can’t fit it between the last session and the evening events on Wednesday or Thursday.  We had some discussion around breakfast time but I didn’t think that was realistic.  This is the least bad time we could come up with. Last year we had 60-70 people attend.  These are the items that were specific things that I could work on: The first question was whether to increase transparency around individual votes of Board members.  We approved this at the Board meeting the following day.  The only caveat was that if the Board is given confidential information as a basis for their vote then we may not be able to disclose individual votes.  Putting a Director in a position where they can’t publicly defend the reason for their vote is a difficult situation.  Thanks Kendal! Can we have a Board member discretionary fund?  As background, I took a couple of people to lunch so we could have a quiet place to talk.  I bought lunch but wasn’t able to expense it back to PASS.  We just don’t have a budget item for things like this.  I think we should.  I would guess the entire Board would like it also.  It was in an earlier version of the budget but came out as part of a cost-cutting move to balance the budget.  I’d like to see it added back in but we’ll have to see. I know there were a comments about the elections.  At this point we had created the Election Review Committee.  I’ve already written at length about this process. Where does IT work go?  PASS started to publish our internal management reports starting in December 2010.  You can find them on our Governance page.  These aren’t filtered at all and include a variety of information about IT projects.  The most recent update had roughly a page of updates related to IT.  Lots of the work was related to Summit and the Orator tool that we use to manage speaker submissions. There were numerous requests that Tina Turner not be repeated.  Done.  I don’t think we’ll do anything quite like that again.  We had a request for a payment plan for Summit.  We looked into this briefly but didn’t take any action.  We didn’t think the effort was worth the small number of people that would use it.  If you disagree, submit this on our Summit Feedback site and get some votes. There were lots of suggestions around the first-timers events – especially from first timers.  You can find all our current activities related to first-timers at the First Timers page on the Summit web site.  Plus links to 34 (!) blog posts on suggestions for first-timers.  And a big THANK YOU to Confio and Red Gate for sponsoring this. I hope you get the chance to attend.  These events are very helpful to me as a Board member.  I like being able to look around the room as comments are being made and see the audience reaction.  It helps me gauge the interest in an idea. I’d also like to direct you to the Summit Feedback site.  You can submit and vote on ideas to make the Summit a better experience.  As of right now we have the suggestions from last year still up.  We may reset these prior to the Summit though.

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  • Doctrine2 Mutliple DBs without Symfony2?

    - by ehime
    Hey guys I know that using the Doctrinebundle in Symfony2 it is possible to instantiate multiple DB connections under Doctrine... $connectionFactory = $this->container->get('doctrine.dbal.connection_factory'); $connection = $connectionFactory->createConnection(array( 'driver' => 'pdo_mysql', 'user' => 'foo_user', 'password' => 'foo_pass', 'host' => 'foo_host', 'dbname' => 'foo_db', )); I'm curious if this is the case if you are using PURELY Doctrine though?, I've set up Doctrine via Composer like so... { "config": { "vendor-dir": "lib/" }, "require": { "doctrine/orm": "2.3.4", "doctrine/dbal": "2.3.4" } } And have been looking for my ConnectionFactory class but am not seeing it anywhere? Am I required to use Symfony2 to do this? Thanks!

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  • can't run a scala script on Mac OS X

    - by wataradio
    Running a scala script on Mac OS X results in the following error: Unable to establish connection to compilation daemon I googled and found a page reported the same problem: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=576568 To solve the problem, the page said: Can you please tell what does /etc/sysctl.d/bindv6only.conf contain? If the value is 1, can you try to: 1) sudo sed -i 's/net.ipv6.bindv6only\ =\ 1/net.ipv6.bindv6only\ =\ 0/' \ /etc/sysctl.d/bindv6only.conf && sudo invoke-rc.d procps restart 2) Then, run scala/fsc as usual and see if the bug is still there. But I can't find a bindv6only.conf in my Mac OS X. How can I solve the problem? -- System Information: Scala version 2.7.7.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_20) Mac OS X 10.6.3

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