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• Entity Framework - Optimistic Concurrency Issue

  - by Cranialsurge

  I have a windows service that runs every 10 seconds ... each time it runs, it takes some test data, modifies it and persists it to the database using the EntityFramework. However, on every second run, when I try to persist the change I get the following Optimistic Concurrency Exception:- Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries I know for a fact that there is nothing else writing to that DB but my service which updates records every 10 seconds. What could be causing the concurrency exception here ?

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• Providing dynamic data to webpage

  - by Marius

  Hi, I have a web page that displays dynamic data which changes every 2 seconds. Data is selected from various data sources including Oracle. Currently, the page reloads every 10 seconds and runs a PHP script which retrieves the data and displays the page. I have other pages that gives a different view on the same data. This means the same query is run again for them as well. If I have 4 of these pages with 10 concurrent users each, suddenly the data retrieval happens 40 times every 10 seconds, obviously not ideal. I have some ideas on how to improve this situation, but I thought I would ask from some ideas from other experts that might have come across a similar situation. I'm not bound to PHP, and my server is on a Linux platform. Regards Marius

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• Providing dynamic data to webpage

  - by Marius

  Hi, I have a web page that displays dynamic data which changes every 2 seconds. Data is selected from various data sources including Oracle. Currently, the page reloads every 10 seconds and runs a PHP script which retrieves the data and displays the page. I have other pages that gives a different view on the same data. This means the same query is run again for them as well. If I have 4 of these pages with 10 concurrent users each, suddenly the data retrieval happens 40 times every 10 seconds, obviously not ideal. I have some ideas on how to improve this situation, but I thought I would ask from some ideas from other experts that might have come across a similar situation. I'm not bound to PHP, and my server is on a Linux platform. Regards Marius

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• Debugging nth-child selector

  - by Ross

  I have the following selectors: .progress:nth-child(3n+1) { background: teal; } .progress:nth-child(3n+2) { background: red; } .progress:nth-child(3n+3) { background: blue; } However all of the items end up with a teal background. Are these selectors correct? I'm thinking I should get: Teal (every 3, starting with 1) Red (every 3, starting with 2) Blue (every 3, starting with 3) etc. I've tested on Firefox 3.5.8 and Opera 10.10 on Ubuntu. Also tested with nothing but these rules in the CSS. I'm using the YUI Reset stylesheet but excluding it does nothing.

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• How to prevent popups when loading a keystore

  - by Newtopian

  Hi as corollary to this question I wanted to ask if you know how to prevent the poping of dialogue either to ask for password or to ask to insert a certificate. We are currently building a system where we have to use the windows keystore to get certificates that are stored on USB token containing both reader and certificate. Unlike the original question we do not experience problems when loading the keystore but when we are accessing it. If there is only a single certificate in the keystore no problem, we get the appropriate password popup at the appropriate time and that's it. However if a second USB key gets inserted in the system and later removed the entry remains in the keystore and from then-on every time we try to access information in the keystore we get a popup to insert the key. This occurs for every certificates in the store for which the key is not currently connected to the computer. The system we are interfacing with that requires these certificates necessitates that we perform multiple cryptographic operations and to have these popups to come up every times is rather annoying to say the least.

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• Programmatic resource monitoring per process in Linux

  - by tuxx

  Hi, I want to know if there is an efficient solution to monitor a process resource consumption (cpu, memory, network bandwidth) in Linux. I want to write a daemon in C++ that does this monitoring for some given PIDs. From what I know, the classic solution is to periodically read the information from /proc, but this doesn't seem the most efficient way (it involves many system calls). For example to monitor the memory usage every second for 50 processes, I have to open, read and close 50 files (that means 150 system calls) every second from /proc. Not to mention the parsing involved when reading these files. Another problem is the network bandwidth consumption: this cannot be easily computed for each process I want to monitor. The solution adopted by NetHogs involves a pretty high overhead in my opinion: it captures and analyzes every packet using libpcap, then for each packet the local port is determined and searched in /proc to find the corresponding process. Do you know if there are more efficient alternatives to these methods presented or any libraries that deal with this problems?

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• How to code Fizzbuzz in F#

  - by Russell

  I am currently learning F# and have tried (an extremely) simple example of FizzBuzz. This is my initial attempt: for x in 1..100 do if x % 3 = 0 && x % 5 = 0 then printfn "FizzBuzz" elif x % 3 = 0 then printfn "Fizz" elif x % 5 = 0 then printfn "Buzz" else printfn "%d" x What solutions could be more elegant/simple/better (explaining why) using F# to solve this problem? Note: The FizzBuzz problem is going through the numbers 1 to 100 and every multiple of 3 prints Fizz, every multiple of 5 prints Buzz, every multiple of both 3 AND 5 prints FizzBuzz. Otherwise, simple the number is displayed. Thanks :)

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• Finding out if an IP address is static or dynamic?

  - by Joshua

  I run a large bulletin board and I get spammers every now and again. My moderation team does a good job filtering them out but every time I IP ban them they seem to come back (I'm pretty sure it's the same person on some occasions, as the post patterns are exactly the same as are the usernames) but I'm afraid to ban them by IP address every time. If they are on a dynamic IP address, I could be banning innocent users later down the line when they try to get to my forum through SERPs, but if I ban only via static IPs I know that I'm only banning that one person. So, is there a way to properly determine if an IP address is static or dynamic? Thanks.

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• Does the chunk of the System.Collections.Concurrent.Partitioner need to be thread safe?

  - by Scott Chamberlain

  I am working with the Parallel libraries in .net 4 and I am creating a Partitioner and the example shown in the MSDN only has a chunk size of 1 (every time a new result is retrieved it hits the data source instead of the local cache. The version I am writing will pull 10000 SQL rows at a time then feed the rows from the cache until it is empty then pull another batch. Each partition in the Partitioner has its own chunk. I know every time I call to the IEnumerator in from the SQL data-source that needs to be thread safe but for use in a Parallel.ForEach do I need to make every call to the cache for the chunking thread safe?

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• NoSQL and meteorological data

  - by christian studer

  So there's this new cool thing, these NoSQL-databases. And so there's my data: Rows of rows of rows of meteorological data: Values, representing certain measurements at a certain station (Identified by a WMO number, not coordinates), at a certain time. Not every station measures every parameter, not every parameter is measured all the time. I store this data (30 years worth of hourly values, resulting in ~1 billion values) currently in MySQL. The continous growth and the forseeable addition of even more data give me a little headache. Reading about the document based NoSQL systems which seem to scale rather easily, I was wondering if NoSQL is a viable data storage concept for meteorological data too. Do you have any experience with this?

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• Git index resets itself

  - by trobrock

  Every so often when I run git add . to add new files to my repo my git index will reset and think all the files in the repo have been deleted. I run these commands: git status git add . git status git commit -a -m "Commit message" everything looks fine at all those points until I commit and it says every file was deleted, all I have to do it run git add . and commit again to get the files back, but this becomes a pain. And this doesnt happen every time, maybe about 40% of the time. Anyone know why this might happen? I am on Mac OS 10.6.3 with Git 1.6.6

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• How do I save user specific data in an asp.net site?

  - by Greg McNulty

  I just set up user profiles using asp.net 3.5 using wvd. For each user I would like to store data that they will be updating every day. For example, every time they go for a run they will update time and distance. I intend to allow them to also look up their history of distance and time from any past date. My question is, what does the database schema usually look like for such a set up? Currently asp.net set up a db for me when I made user profiles. Do I just add an extra table for every user? Should there be one big table with all users data? How do I relate a user I'd to their specific data? Etc.... I have never done this before so any ideas on how this is usually done would be very helpful. Thank you.

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• Rails relation select

  - by Dimitar Vouldjeff

  Hi, I have the following models: class User < ActiveRecord::Base has_many :results, :dependent => :destroy has_many :participants, :dependent => :destroy has_many :courses, :through => :participants end class Course < ActiveRecord::Base has_many :tests, :dependent => :destroy has_many :participants, :dependent => :destroy has_many :users, :through => :participants end class Result < ActiveRecord::Base belongs_to :test belongs_to :user end class Test < ActiveRecord::Base belongs_to :course has_many :results, :dependent => :destroy end The Idea is that a user has_and_belongs_to_many courses, the course has_many tests, and every test has_and_belongs_to_many users (results). So what is the best query to select every Result from a single Course (not test), and also the query to select every Result from a single Course, but from one user. Thanks!

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• acts_as_solr returns all rows in the database when using the model as search query

  - by chris Chan

  In our application we're using acts_as_solr for search. Everything seems to be running smoothly except for the fact that using the model name as the search query returns every single row in the table. For example, let's say we have a users table. We specify acts_as_solr in our model to search the fields first name, last name and handle acts_as_solr :fields = [:handle, :lname, :fname]. When you use "user" as the search term it returns every single user in the system, or every row in the database as a result. Has anyone else run into this?

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• Refresh a jQuery function

  - by Toro

  Is possible refresh a function every x seconds or refresh it on single event? I explain: I have a function that make pagination on my website, inside every div that are "pages" I have some pictures where I have added LightBox. Everything works nice on the first div (page) but when I change the page it doesnt' work anymore. I tried to fix in this way: $('.pagination a').click(function () { initShadow(); }); In this way it work on the pageLoad and on the first page that I change, than it stop again. So I need to fix this issue, everytime I change the "page" I would like it works fine. Is possible to refresh a function every x second or to refresh it everytime I click on the pagination buttons?

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• Task management algorithm in C#

  - by silverwizz

  Hi guys, i am looking for efficient task management fo C# what i mean by task management is executing pre-defined interval time of task. Example: task a needs to be run every 1 mins task b needs to be run every 3 mins task c needs to be run every 5 mins these tasks can be added and removed in arbitary time... And the task that i mentioned can be 100000 or more... The task will bw executed forever until it is removed... Do u guys familiar with this kind of algorithm? I am thinking to implement in either c# or php.... Thanks

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• Best way to do partial update content on ASP.NET

  - by kevin

  Initially i was planning to use master page for every page in my application. At the end, i found out every times the page is changed, it reload full page even it have the same master page. I have confused the frameset with the master page. Then, i have 2 ideas in my minds to achieve it by not using master page. Using iframe and set the attribute to runat server, so that i can change the page in my codebehind.(I preferred to control the page flow in server side) Make every single child page to user control. Then dynamically load it to the panel in codebehind. Please give me some advise which method is the best in ASP.NET with AJAX enabled, or other ways that is better. Thanks.

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• Any way to have delayed_job execute some run-once code at startup and use across all jobs?

  - by Rob Cameron

  So I've got a delayed_job task that pushes some info to an XMPP server. Ideally you create a connection to XMPP once and then constantly push data to it, rather than creating a new connection every time you have some data to send. Is there any kind of facility in delayed_job for running a sort of 'setup' method when a worker starts, have it set some instance variables (like the XMPP connection object) that can then be used by all the jobs that come up? It's okay if each worker runs its own setup method. I just don't want every job (thousands per day) connecting to the XMPP server from scratch every time. Thanks for any help!

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• Formatting Log File Messages

  - by Kumar

  This is about formatting the messages for logging so as to subsequently be able to parse them relatively easily esp. given the extensive logging required in financial apps Typically a line in the log file is of the form TimeStamp: Module/Function: where the log string contains whatever you choose, typically you'd have some key=value paradigm or even johnny5 key {value} etc. A regex search through the log file might easily pick up Module/Function but enforcing and maintaing consistency on the log string itself for every developer on the team is often a pain The logging api's are typically ILog.LogInfo(string text, params object[] args) ILog.LogWarning(string text, params object[] args) ILog.LogError(string text, params object[] args) Looking for opinions on better logging api's to format the log messages where a regex search can be performed for Module/Function = Basket/AddItem TokenA = Value1 and TokenB = Value2 etc. without going over every developer's every logging call

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• How to save objects using Multi-Threading in Core Data?

  - by Konstantin

  I'm getting some data from the web service and saving it in the core data. This workflow looks like this: get xml feed go over every item in that feed, create a new ManagedObject for every feed item download some big binary data for every item and save it into ManagedObject call [managedObjectContext save:] Now, the problem is of course the performance - everything runs on the main thread. I'd like to re-factor as much as possible to another thread, but I'm not sure where I should start. Is it OK to put everything (1-4) to the separate thread?

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• How to create a "sidebar" in Umbraco CMS?

  - by usr

  In Umbraco, every page has a content field that you can edit in the admin-area. What I want would be a second content field that I (actually my customer who will be editing the content by himself) can edit on every page. I would then create a masterpage/template that contains the two content areas (the first one as the main content and the second one as the sidebar). At least this is how I would do it. Is this possible or is there even a better approach for having a main content and a separate sidebar on every page?

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• Find overdrawn accounts in SQL

  - by mazzzzz

  Hey guys, I have a program that allows me to run queries against a large database. I have two tables that are important right now, Deposits and withdraws. Each contains a history of every user. I need to take each table, add up every deposit and withdraws (per user), then subtract the withdraws from the deposits. I then need to return every user whos result is negative (aka they withdrew more then they deposited). Is this possible in one query? Example: Deposit Table: |ID|UserName|Amount| |1 | Use1 |100.00| |2 | Use1 |50.00 | |3 | Use2 |25.00 | |4 | Use1 | 5.00 | WithDraw Table: |ID|UserName|Amount| |2 | Use2 | 5.00 | |1 | Use1 |100.00| |4 | Use1 | 5.00 | |3 | Use2 |25.00 | So then the result would output: |OverWithdrawers| | Use2 | Is this possible (I sure don't know how to do it)? Thanks for any help, Max

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• draw line with php using coordinates from txt file

  - by netmajor

  I have file A2.txt with coordinate x1,y1,x2,y2 in every line like below : 204 13 225 59 225 59 226 84 226 84 219 111 219 111 244 192 244 192 236 209 236 209 254 223 254 223 276 258 276 258 237 337 in my php file i have that code. This code should take every line and draw line with coordinate from line. But something was wrong cause nothing was draw :/: <?php $plik = fopen("A2.txt", 'r') or die("blad otarcia"); while(!feof($plik)) { $l = fgets($plik,20); $k = explode(' ',$l); imageline ( $mapa , $k[0] , $k[1] , $k[2] , $k[3] , $kolor ); } imagejpeg($mapa); imagedestroy($mapa); fclose($plik) ; ?> If I use imagejpeg and imagedestroy in while its only first line draw. What to do to draw every line ?? Please help :)

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• How do I build a specialized JQuery Timer

  - by Sayem Ahmed

  I have an asp.net page where two grid views are available showing current stock market price updates. I need to update these two grid views every 20 seconds. So I was thinking of using JQuery to do this job. What I need is a timer which will fire every 20 seconds, send an ajax request to the servers, bring the order lists from the server using json and then update those two grid views. If a request to the server is still being served 20 seconds after it is fired, then I want the old one to be aborted without causing any trouble. I already know how to bring objects using json. I just need to figure out how to send a request every 20 seconds and cancel a request if it is still being server for 20 seconds.

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• FluentNhibernate dynamic runtime mappings.

  - by Paul Knopf

  I am building a framework where people will be able to save items that the created by inheriting a class of mine. I will be iterating over every type in the appdomain to find classes that I want to map to nhibernate. Every class that I find will be a subclass of the inherited type. I know how to create sub types in FluentNhibernate, but every sub type requires its own ClassMap class. Since I won't know these untill runtime, there is no way I can do that. Is there a way that I can add mappings to fluent nhibernate? Note, I know this is possible without fluent nhibernate using the Cfg class, but I don't want to manage the same code two different ways.

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