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  • Java App Engine - ranked counter

    - by Richard
    I understand the sharded counter, here: http://code.google.com/appengine/articles/sharding_counters.html The problem is that a simple counter will not work in my application. I am sorting my entities by a particular variable so I am returned not so much a count, but more of a rank. My current method is: SELECT COUNT(this) FROM Entity.class WHERE value <= ? Result + 1 is then the rank of the parameter in relation to the value variable in the persistent Entity objects. The limitation of this is the highest rank being returned is 1001 because count() can give a maximum of 1000. The reason I cannot store the rank on the Entity object is that the ranks are updated very often, and re-setting this rank variable would be much too costly. Any ideas on the best way to accomplish this?

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  • How to get a Magento product collection as a comma separated list of SKU's

    - by Sam
    Hi All I have a custom module I made for Magento. From the admin, there is a multi-select list of store products. The selected products from this are output in the form of a comma separated list of SKU's - for example: // Get Featured Products from list $configData = Mage::getStoreConfig('featured_products'); $featuredlist = $configData['settings']['featuredlist']; This gives the output in the following format if I < ?php echo $featuredlist ?: cn,asc,ken,steve,nine,ecco,ana Is it possible to output a collection from a category in the same way, as a comma separated list of SKU's? I currently use the following to get a collection: $_productCollection = Mage::getResourceModel('reports/product_collection') ->addAttributeToSelect('*') ->addAttributeToFilter('visibility', $visibility) ->addCategoryFilter($_category); $_productCollection->load()

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  • Grails MySql processList

    - by Masiar Ighani
    Hello, i have a grails application with a webflow. I store my inner flow objects of interest in the converstaion scope. After entering and leaving the flow a few times, i see that the single user connected to the DB (MySql) generates a lot of threads on the MySql Server which are not released. The processlist in mysql show me the threads in sleeping mode and a netstat on the client shows me established connections to the mysql server. I assume the connections are held active and not released. But why is that? What do grails exactly do when entering and leaving a flow? Why are so many connections opened and not closed? Any help would be appreciated. regards, masiar

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  • Are ORM's counterproductive to OO design?

    - by Jeremiah
    In OOD, design of an object is said to be characterized by its identity and behavior. Having used OR/M's in the past, the primary purpose, in my opinion, revolves around the ability to store/retrieve data. That is to say, OR/M objects are not design by behavior, but rather data (i.e. database tables). Case and point: Many OR/M tools come with a point-to-a-database-table-and-click-object-generator. If objects are no longer characterized by behavior this will, in my opinion, muddy the identity and responsibility of the objects. Subsequently, if objects are not defined by a responsibility this could lend a hand to having tightly coupled classes and overall poor design. Furthermore, I would think that in an application setting, you would be heading towards scalability issues. So, my question is, do you think that ORM's are counterproductive to OO design? Perhaps the underlying question would be whether or not they are counterproductive to application development.

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  • Delphi Unicode String Type Stored Directly at its Address

    - by Andreas Rejbrand
    I want a string type that is Unicode and that stores the string directly at the adress of the variable, as is the case of the (Ansi-only) ShortString type. I mean, if I declare a S: ShortString and let S := 'My String', then, at @S, I will find the length of the string (as one byte, so the string cannot contain more than 255 characters) followed by the ANSI-encoded string itself. What I would like is a Unicode variant of this. That is, I want a string type such that, at @S, I will find a unsigned 32-bit integer containing the length of the string in bytes (or in characters, which is half the number of bytes) followed by the Unicode representation of the string. I have tried WideString, UnicodeString, and RawByteString, but they all appear only to store an adress at @S, and the actual string somewhere else (I guess this has do do with reference counting and such). I suspect that there is no built-in type to use, and that I have to come up with my own way of storing text the way I want (which actually is fun). Am I right?

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  • ruby rails loop causes server freeze

    - by Darkerstar
    Hi all: I am working on a Ruby on Rails project on Windows. I have Ruby 1.86 and Rails 2.35 installed. Everything is fine until I tried to implement a comet process. I have the following code written to respond to a long poll javascript request. But everytime this function is called, it will hang the whole rails server, no second request can get in, until the timeout. (I know there is juggernaut, but I like to implement one myself first :) Is this due to my server setup? The project will be deployed on a linux server with Ngix and Passenger setup, will it suffer the same problem? def comet_hook timeout(5) do while true do key = 'station_' + station_id.to_s + '_message_lastwrite' if Rails.cache.exist?(key) @cache_time = DateTime.parse(Rails.cache.read(key)) if @cache_time > hook_start @messages = @station.messages_posted_after(hook_start) hook_start = @cache_time break end end end ... end Also with Rails memory store cache, I keep getting "cannot modify frozen object" error, so the above script only worked for me when I switched to File cache. :(

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  • Removing New line character in Fields PHP

    - by Aruna
    Hi, i am trying to upload an excel file and to store its contents in the Mysql database. i am having a problem in saving the contents.. like My csv file is in the form of "1","aruna","IEEE paper" "2","nisha","JOurnal magazine" actually i am having 2 records and i am using the code <?php $string = file_get_contents( $_FILES["file"]["tmp_name"] ); //echo $string; foreach ( explode( "\n", $string ) as $userString ) { echo $userString; } ? since in the Csv record there is a new line inserted in between IEEE and paper it is dispaying me as 3 records.. How to remove this new line code wise and to modify the code so that only the new line between the records 1 and 2 is considered... Pls help me....

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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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  • How to move a ruby on rails application to a new server

    - by ManiacZX
    I have a rails app on an old Ubuntu server I need to move onto a new machine. I haven't worked with ruby on rails so I don't really know anything about the structure of the app. I want to load this onto an Ubuntu 8.04 AMI on Amazon EC2 and am looking for any information regarding the migration process such as: Do I copy over the entire folder defined as the application root in the mongrel config (for ex: /u/apps/myapp/current) or just certain folders? Am I looking for trouble if I go with the latest versions of ruby and the various gems? Any general gotchas to look out for in the process. Current server information: root@webnode001:/# cat /proc/version Linux version 2.6.15-27-server (buildd@terranova) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP Fri Dec 8 18:43:54 UTC 2006 root@webnode001:/# rails -v Rails 1.2.3 root@webnode001:/# mongrel_rails cluster::configure --version Version 1.0.1 root@webnode001:/# gem -v 0.9.0 root@webnode001:/# gem list -l *** LOCAL GEMS *** actionmailer (1.3.3, 1.2.5) Service layer for easy email delivery and testing. actionpack (1.13.3, 1.12.5) Web-flow and rendering framework putting the VC in MVC. actionwebservice (1.2.3, 1.1.6) Web service support for Action Pack. activerecord (1.15.3, 1.15.2, 1.14.4) Implements the ActiveRecord pattern for ORM. activesupport (1.4.2, 1.4.1, 1.3.1) Support and utility classes used by the Rails framework. cgi_multipart_eof_fix (2.1) Fix an exploitable bug in CGI multipart parsing which affects Ruby <= 1.8.5 when multipart boundary attribute contains a non-halting regular expression string. daemons (1.0.7, 1.0.5, 1.0.4, 1.0.2) A toolkit to create and control daemons in different ways eventmachine (0.7.2, 0.7.0) Ruby/EventMachine socket engine library fastercsv (1.2.0, 1.1.0) FasterCSV is CSV, but faster, smaller, and cleaner. fastthread (1.0) Optimized replacement for thread.rb primitives ferret (0.11.4) Ruby indexing library. gem_plugin (0.2.2, 0.2.1) A plugin system based only on rubygems that uses dependencies only mongrel (1.0.1, 0.3.13.4) A small fast HTTP library and server that runs Rails, Camping, Nitro and Iowa apps. mongrel_cluster (0.2.1) Mongrel plugin that provides commands and Capistrano tasks for managing multiple Mongrel processes. mysql (2.7) MySQL/Ruby provides the same functions for Ruby programs that the MySQL C API provides for C programs. piston (1.3.3) Piston is a utility that enables merge tracking of remote repositories. rails (1.2.3, 1.1.6) Web-application framework with template engine, control-flow layer, and ORM. rake (0.7.3, 0.7.1) Ruby based make-like utility. sources (0.0.1) This package provides download sources for remote gem installation swiftiply (0.5.1) A fast clustering proxy for web applications.

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  • How can I tell datacontext I've updated a record via StoreProcedure

    - by Ldsenow
    Hi Geeks, I've a stroe procedure to update a record and after running it I use LinqToSql to delete the record. I know it is weird but I just want to test how smart the datacontext it is and understand how it works. Since the datacontext caches the results so any change via it can be recorded but now I use a store procedure to update something, it would not know. So when I try to delete it, an exception comes out "Row not found or changed". How I can tell the datacontext what I have updated? If I can do so the problem will sovle.

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  • OTA plist app install from within phonegap app for iPad

    - by Farhan Ahmad
    I am trying to initiate a OTA app install from within a phonegap iPad app. I have tried this: var url = "http://www.example.com/test.plist"; window.open("itms-services://?action=download-manifest&url=" + url, "_blank"); This works in iOS 5 but NOT iOS 6. I have also tried using the ChildBrowser plugin to point to a page with a link to the OTA app install but that doesn't work either. (If I visit the webpage directly from within the native iPad browser, it works fine) Does anyone know how I can initiate a OTA app install from within the phonegap iPad app? (must work in iOS 5 and iOS 6) I am trying to implement an auto update feature within a Ad-Hock iPad app (not through App Store). So when the app detects that there is a new update, it will prompt the user to install the new update and thats where I need this functionality.

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  • how to run my iphone 2.0 app in iphone os 2.0 and also 3.0 and above os

    - by Rahul Vyas
    i have iphone with os ver. 2.0 i read that for app store all appplication must be run 3.0 os.so how could i make my application to run in both firmware.is there a way i can detect if os ver.3.0 then run different statments alse run statments for lower than 3.0 os.currently i am using this. #if __IPHONE_3_0 cell.textLabel.text=cellValue; [cell.textLabel setFont:[UIFont systemFontOfSize:15.0]]; [cell.textLabel setLineBreakMode:UILineBreakModeTailTruncation]; #else cell.text=cellValue; [cell setFont:[UIFont systemFontOfSize:15.0]]; [cell setLineBreakMode:UILineBreakModeTailTruncation]; #endif will it run on both firmware i want to make my app to be run on =3.0 os and lower than this...please help me how do i check my application for deprecated methods...i can only see this line as deprecated cell.text=cellValue; is there anything to change.i have installed new sdk named iphone_sdk_3.0__leopard__9m2736__final.dmg

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  • Is it worthwhile to implement observer pattern in PHP?

    - by Extrakun
    I have been meaning to make use of design pattern in PHP, such as the observer pattern, but that I have to recreate the observers' relationship each time the page is loaded pains me. As references are saved as a new concrete objects in session, there is no way to preserve relationships between subscribers and their observers unless you use a GUID or some other properties to form a lookup, and store that property instead. With the cost of recreating the relationships each time a page is loaded, is it worthwhile to use design patterns such as observers in PHP, compared to having a clean design? Any real-world experience to share?

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  • prevent bots to query my database several times

    - by Alain
    Hi all, I'm building an application that is a kind of registry. Think about the dictionary: you lookup for a word and it return something if the word is founded. Now, that registry is going to store valuable informations about companies, and some could be tempted to get the complete listing. My application use EJB 3.0 that replies to WS. So I was thinking about permits a maximum of 10 query per IP address per day. Storing the IP address and a counter on a table that would be empty by a script every night. Is it a good idea/practice to do so? If yes, how can I get the IP address on the EJB side? Is there a better way to prevent something to get all the data from my database? I've also though about CAPTCHA but I think it's a pain for the user, and sometime, they are difficult to read even for real human. Hope it's all clear since I'm not english... Thanks Alain

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  • Slow insert speed in Postgresql memory tablespace

    - by Prashant
    Hi, I have a requirement where I need to store the records at rate of 10,000 records/sec into a database (with indexing on a few fields). Number of columns in one record is 25. I am doing a batch insert of 100,000 records in one transaction block. To improve the insertion rate, I changed the tablespace from disk to RAM.With that I am able to achieve only 5,000 inserts per second. I have also done the following tuning in the postgres config: Indexes : no fsync : false logging : disabled Other information: - Tablespace : RAM - Number of columns in one row : 25 (mostly integers) - CPU : 4 core, 2.5 GHz - RAM : 48 GB I am wondering why a single insert query is taking around 0.2 msec on average when database is not writing anything on disk (as I am using RAM based tablespace). Is there something I am doing wrong? Help appreciated. Prashant

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  • What is a hardware-id?

    - by Rob
    Some forums that I regularly visit sell premium programs, and to prevent them from being leaked they use hardware-id authentication. That is, first they send you a program to run to grab your HWID, you tell them your HWID, they store it in a database, then they send you the actual program. If your HWID isn't in the database, the program won't run. So what is Hardware-ID, and how is it generated? Why is it that my HWID is different depending on the programmer that sends me a HWID-grabber?

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  • Backup & recovery of multiple MySQL databases (InnoDB & MyISAM)

    - by Cymon
    I am working on nightly and hourly backups of MySQL Databases. There are multiple MySQL databases which are either InnoDB or MyISAM (Note: Each database is either InnoDB or MyISAM for a reason). With the 2 different types I want to make sure I am grabbing everything that is needed for backup and recovery. Here is my current plan Nightly -mysqldump of each DB which is stored locally and remotely. Hourly -flush binary logs and store them locally and remotely. Weekly -expire binary logs older than a week. I feel like I am grabbing everything that is needed for the MyISAM databases but I am concerned about the InnoDB databases and the log files (ib_logfile0, ib_logfile1, ibdata1) they create. Should I backup these files? Nightly? Hourly? Both? Do I really need them if I am already doing the above nightly and hourly backups?

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  • Efficiently check string for one of several hundred possible suffixes

    - by Ghostrider
    I need to write a C/C++ function that would quickly check if string ends with one of ~1000 predefined suffixes. Specifically the string is a hostname and I need to check if it belongs to one of several hundred predefined second-level domains. This function will be called a lot so it needs to be written as efficiently as possible. Bitwise hacks etc anything goes as long as it turns out fast. Set of suffixes is predetermined at compile-time and doesn't change. I am thinking of either implementing a variation of Rabin-Karp or write a tool that would generate a function with nested ifs and switches that would be custom tailored to specific set of suffixes. Since the application in question is 64-bit to speed up comparisons I could store suffixes of up to 8 bytes in length as const sorted array and do binary search within it. Are there any other reasonable options?

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  • Defining Form Input with Dialog

    - by Workoholic
    Hi. I want my php application to allow the user to select a file from their computer. I then want to store the file's path, but I don't want to upload the file. With the <input type="file" />, the file is uploaded, which would take too long. Is there a way to do this? Maybe if I change the input's type to text with jquery right before the form is sent? I could just let the user type the path, but that is not very convenient...

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  • Subsonic SimpleRepository upload image

    - by Dusty Roberts
    Hi There I have been using SimpleRepository for months now, and for the first time i have to upload and store an Image/Document in the database My Class looks as follow: public class Document: ObjectMetaData { public string FileName { get; set; } public Guid UserId { get; set; } public DocumentType DocumentType { get; set; } public string DocumentLocation { get; set; } public byte[] DocumentData { get; set; } } public enum DocumentType { EmploymentContractSigned = 1, EmploymentContractUnSigned = 2 } When i persist the data to the db, subsonic just ignore's the "DocumentData" how do i save the file to db then? DocumantData = File.ReadAllBytes("somefile.doc")

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  • Creating DescriptionAttribute on Enumeration Field using System.Reflection.Emit

    - by Manish Sinha
    I have a list of strings which are candidates for Enumerations values. They are Don't send diffs 500 lines 1000 lines 5000 lines Send entire diff The problem is that spaces, special characters are not a part of identifiers and even cannot start with a number, so I would be sanitizing these values to only chars, numbers and _ To keep the original values I thought of putting these strings in the DescriptionAttribute, such that the final Enum should look like public enum DiffBehvaiour { [Description("Don't send diffs")] Dont_send_diffs, [Description("500 lines")] Diff_500_lines, [Description("1000 lines")] Diff_1000_lines, [Description("5000 lines")] Diff_5000_lines, [Description("Send entire diff")] Send_entire_diff } Then later using code I will retrieve the real string associated with the enumeration value, so that the correct string can be sent back the web service to get the correct resource. I want to know how to create the DescriptionAttribute using System.Reflection.Emit Basically the question is where and how to store the original string so that when the Enumeration value is chosen, the corresponding value can be retrieved. I am also interested in knowing how to access DescriptionAttribute when needed.

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  • Is it easy to switch from relational to non-relational databases with Rails?

    - by Tam
    Good day, I have been using Rails/Mysql for the past while but I have been hearing about Cassandra, MongoDB, CouchDB and other document-store DB/Non-relational databases. I'm planning to explore them later as they might be better alternative for scalability. I'm planning to start an application soon. Will it make a different with Rails design if I move from relational to non-relational database? I know Rails migrations are database-agnostic but wasn't sure if moving to non-relational will make difference with design or not.

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  • How to create a custom yaml config file in Symfony

    - by Guillaume Flandre
    What I want to do is quite simple: store data in a custom config file that I want to read later on. I created my file something.yml that I put in the global config directory. It looks like that: prod: test: ok dev: test: ko all: foo: bar john: doe Then I copied the config_handlers.yml and also put it in the config directory and added the following at the top of the file: config/something.yml: class: sfDefineEnvironmentConfigHandler param: prefix: something_ But if I'm calling sfConfig::get("something_foo"); I keep getting NULL. What did I do wrong? I just want to read values, so no need to create a custome config handler, right? I've read the doc here: http://www.symfony-project.org/book/1_2/19-Mastering-Symfony-s-Configuration-Files even though I'm running 1.4 (I don't think that changed since then). Edit: Of course I can use sfYaml::load() but I'd like to do things in a better way.

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  • Get directory contents in date modified order

    - by nevan
    Is there an method to get the contents of a folder in a particular order? I'd like an array of file attribute dictionaries (or just file names) ordered by date modified. Right now, I'm doing it this way: get an array with the file names get the attributes of each file store the file's path and modified date in a dictionary with the date as a key Next I have to output the dictionary in date order, but I wondered if there's an easier way? If not, is there a code snippet somewhere which will do this for me? Thanks.

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  • How to start a major iPhone app update in Xcode

    - by Eric
    I have an app in the iPhone app store and have released several minor updates to it. I want to begin work on some major feature additions and reorganization, but don't want to lose the source code of my most recent version in case everything goes horribly wrong. Should I start a new Xcode project from scratch and copy my existing source in? If I do this will I be able to submit the build from this new project as an update or will Apple complain that the build comes from a different Xcode project? I've seen (but not used) Xcode's "Snapshots" and "Source Control" features - are these what I'm looking for? Any help or direction greatly appreciated.

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