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How to maintain a pool of names ?

- by Jacques René Mesrine

I need to maintain a list of userids (proxy accounts) which will be dished out to multithreaded clients. Basically the clients will use the userids to perform actions; but for this question, it is not important what these actions are. When a client gets hold of a userid, it is not available to other clients until the action is completed. I'm trying to think of a concurrent data structure to maintain this pool of userids. Any ideas ? Would a ConcurrentQueue do the job ? Clients will dequeue a userid, and add back the userid when they are finished with it.

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html tags between <style> tags

- by Gagan

<html> <body> <style type="text/css"> p.first {color:blue} p.second {color:green} </style> <p class="first">Hello World</p> <p class="second">Hello World</p> <style type="text/css"> p.first {color:green} p.second {color:blue} </style> <p class="first">Hello World</p> <p class="second">Hello World</p> </body> </html> How is a browser supposed to render css which is non contiguous? Is it supposed to generate some data structure using all the css styles on a page and use that for rendering? Or does it render using style information in the order it sees?

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Nested Set - for CMS with two versions (edit / publish) mode

- by Rick

Hi! I'm looking for a solution (PHP/Symfony/Doctrine) for the following problem. I'm creating a table called 'pages'. This table is a nested set. I also want to create a table called 'pages_published' which has ofcourse also a nested set. Once i create a record in table 'pages' at some point i want to publish this to the 'pages_published)-table. How do make sure the sort order and the level in the structure keeps ok. Is there some standard solution for my approach?

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Advanced LINQ Update Statement

- by user1902490

I have a data base with Price_old like: Date --- Hour --- Price _____________________________ Jan 1 --- 1 --- $3.0 Jan 1 --- 2 --- $3.1 Jan 1 --- 3 --- $3.3 Jan 1 --- 4 --- $3.15 Jan 2 --- 1 --- $2.95 Jan 2 --- 2 --- $3.2 Jan 2 --- 3 --- $3.05 What I then have is a spreadsheet, with the same structure, that I will be reading into a datatable, I'll call the new datatable Price_New, note that price new may not have all the same date/hours as Price_Old So, I end up with 2 datatables, Price_Old, and Price_New, and what I need to do is update Price_old with the new prices in Price_New, and then commit those new prices to the Database. I am kinda new to LINQ (about 30 mins of experience) and would really appreciate if someone could give me a pointer or two on whether or not this is doing in LINQ and what the best method would be. Thanks

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Core Data - Relationship to dissimilar entities

- by carotene

Suppose I have the following data model: Entity Person Attribute name String Attribute personType String Attribute dailyRecords Entity CarpenterDailyRecord Attribute numberOfNailsHammered Int Attribute picNameOfFinishedCabinet String Entity WindowWasherDailyRecord Attribute nameOfBuildingWashed String Attribute numberOfWindowsWashed Int I would like to establish a to-many relationship between the Person.dailyRecords and 1 of the daily record entities (which changes depending on the person type). Of course, i could create a CarpenterPerson and WindowWasher entity which each points to it's unique daily record structure, but i have to group people together in my app somehow. so if i do a Group Entity: Entity Group Attribute people array i'm still stuck. how do i point to multiple & different Person entities? There must be an obvious answer, it's just i'm so new to all of this. thanks!

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How to add/register helpers with Zend Framework

- by manyxcxi

I'm just starting out with Zend Framework and am having issues using Zend_Controller_Action_HelperBroker::addPath() to add helpers. I'm not sure if my classes are named incorrectly, I'm giving it the wrong prefix, or what I'm doing wrong so I will post the code and file structure and get out of the way. In Bootstrap.php public function __construct($application) { ... // This works with a manual include_once('../application/plugins/helpers/Csrf.php'); //Zend_Controller_Action_HelperBroker::addHelper(new Application_Controller_Action_Helper_Csrf()); // This isn't picking up my helper class automagically Zend_Controller_Action_HelperBroker::addPath('../application/plugins/helpers','Application_Controller_Action_Helper'); ... } In application/plugins/helpers/Csrf.php class Application_Controller_Action_Helper_Csrf extends Zend_Controller_Action_Helper_Abstract { ... } My directory tree: / application/ ... plugins/ helpers/ Csrf.php CsrfProtect.php ...

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How to enable absolute paths in LaTeX

- by Matthias Günther

Hey, I have one document under ~/my_files/test.tex and want to include in test.tex some styling informations, which can be found under ~/latex/styles/info_hypersetup.tex. When I include the following statement into my test.tex: %% setting the infos for the pdf \include{home/helex/latex/styles/info_hypersetup.tex} I get the following error when running pdflatex test.test: ! I can't write on file `~/latex/styles/info_hypersetup.tex.aux'. I set the rights to 777 but this doesn't changed anything. It works, if I put info_hypersetup.tex in the directory-structure where test.tex is. But I want to use this styleinformation as a global setting for all my documents and don't want to copy it into every project. Thanks for your help.

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Efficient persistent storage for simple id to table of values map for java

- by wds

I need to store some data that follows the simple pattern of mapping an "id" to a full table (with multiple rows) of several columns (i.e. some integer values [u, v, w]). The size of one of these tables would be a couple of KB. Basically what I need is to store a persistent cache of some intermediary results. This could quite easily be implemented as simple sql, but there's a couple of problems, namely I need to compress the size of this structure on disk as much as possible. (because of amount of values I'm storing) Also, it's not transactional, I just need to write once and simply read the contents of the entire table, so a relational DB isn't actually a very good fit. I was wondering if anyone had any good suggestions? For some reason I can't seem to come up with something decent atm. Especially something with an API in java would be nice.

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How to create project specific respository post-commit actions

- by Pacifika

Presently, we've got several main projects each in their own repository. We will have to version-control up to a dozen additional projects. VisualSVN recommends to create 1 respository for our company and then vc all projects inside that. It's a good practice to create one repository for the entire company or department and store all your projects in this repository. Creating separate repository for each project is not a good idea because in that case you will not be able to perform Subversion operations like copy, diff and merge cross-project. VisualSvn.com Currently we're using post-commit hooks to update the testing server with the latest commit and do other project specific actions (such as emailing certain people for one project but not for others) depending on which project has been committed. As post-commit runs for the whole repository, is this still possible in such a situation? How would I go about decerning which project has changes? filter folder structure?

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Does to_json require parameters? what about within rails?

- by Harry Wood

Does to_json require parameters? what about within rails? I started getting the error "wrong number of arguments (0 for 1)" when doing myhash.to_json Unfortunately I'm not sure when this error started happening, but I guess it relates to some versions of either rails or the json gem. I suppose my code (in a rails controller) is using the ActiveSupport::JSON version of to_json, rather than the to_josn method supported by the json gem. ActiveSupport::JSON vs JSON In environment.rb I have RAILS_GEM_VERSION = '2.3.2' and also config.gem "json", :version=> '1.1.7' It's just a simple hash structure containing primitives which I want to convert in my controller, and it was working, but now I can't seem to run to_json without passing parameters.

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Using <style> tags in the <body> with other HTML

- by Gagan

<html> <body> <style type="text/css"> p.first {color:blue} p.second {color:green} </style> <p class="first">Hello World</p> <p class="second">Hello World</p> <style type="text/css"> p.first {color:green} p.second {color:blue} </style> <p class="first">Hello World</p> <p class="second">Hello World</p> </body> </html> How is a browser supposed to render css which is non contiguous? Is it supposed to generate some data structure using all the css styles on a page and use that for rendering? Or does it render using style information in the order it sees?

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Implementing a multi-state planner

- by MoominTroll

I've been asked to develop a system wherein employees can mark on a form their availability on a given day of the week - for instance an employee could mark themselves as available on a given time on a given week, and unavailable on some other time. It looks a little like this: Currently this works by rendering checkboxes within the table, picking up click events in each cell and marking the checkbox and hence the cell appropriately. I'm using the JQuery "click n drag checkbox" plugin from here. However, I've been informed that there could well be more than two states for a given cell (for instance available, unavailable, available in a given circumstance), in which case binding to a checkboxes checked value isnt going to be a lot of help. I've never used javascript or asp.net before and am unsure as to the best way to approach this problem. Ideally I could stick a data structure behind each cell which I could update to a certain state and then get my cell colour by binding to this - however I'm at something as a loss as how to best achieve this.

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Connecting Ingres from C

- by avesus

I need to connect to an Ingres supplied demodb through OpenAPI, both Ingres and C application running on windows. What i have done: Created a "node" in the Ingres Network Utility named "usernode". created user accounts in the Ingres installation (named "user" password "user") and in the Windows user management (the same creds.) Granted necessary privileges to the user in the database. In C code i have called IIapi_connect() function with an IIAPI_CONNPARM structure. Used members: co_target = "usernode::demodb", co_username = "user", co_password = "user" But IIapi_connect() call returns an error: "User provided a vnode as part of the database name (vnode::dbname), but connection information for that vnode is missing. Enter connection information for the vnode using NETUTIL." Anybody knows something that is a weird concept "node"? What are the minimum steps (in the database administration and the function parameters passing) necessary for the successful connect?

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Algorithm for non-contiguous netmask match

- by Gianluca

Hi, I have to write a really really fast algorithm to match an IP address to a list of groups, where each group is defined using a notation like 192.168.0.0/252.255.0.255. As you can see, the bitmask can contain zeros even in the middle, so the traditional "longest prefix match" algorithms won't work. If an IP matches two groups, it will be assigned to the group containing most 1's in the netmask. I'm not working with many entries (let's say < 1000) and I don't want to use a data structure requiring a large memory footprint (let's say 1-2 MB), but it really has to be fast (of course I can't afford a linear search). Do you have any suggestion? Thanks guys. UPDATE: I found something quite interesting at http://www.cse.usf.edu/~ligatti/papers/grouper-conf.pdf, but it's still too memory-hungry for my utopic use case

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Database Abstraction & Factory Methods

- by pws5068

I'm interested in learning more about design practices in PHP for Database Abstraction & Factory methods. For background, my site is a common-interest social networking community currently in beta mode. Currently, I've started moving my old code for object retrieval to factory methods. However, I do feel like I'm limiting myself by keeping a lot of SQL table names and structure separated in each function/method. Questions: Is there a reason to use PEAR (or similar) if I dont anticipate switching databases? Can PEAR interface with the MySqli prepared statements I currently use? Will it help me separate table names from each method? (If no, what other design patterns might I want to research?) Will it slow down my site once I have a significantly large member base?

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Forum board example schema in YAML format - modify for Nested set?

- by takeshin

I have created a forum board app, based on YAML schema found in 'real world examples' of Doctrine Manual, which looks similar to this: --- Forum_Category: columns: root_category_id: integer(10) parent_category_id: integer(10) name: string(50) description: string(99999) relations: Subcategory: class: Forum_Category local: parent_category_id foreign: id Rootcategory: class: Forum_Category local: root_category_id foreign: id Forum_Board: columns: category_id: integer(10) name: string(100) description: string(5000) relations: Category: class: Forum_Category local: category_id foreign: id Threads: class: Forum_Thread local: id foreign: board_id Forum_Entry: columns: author: string(50) topic: string(100) message: string(99999) parent_entry_id: integer(10) thread_id: integer(10) date: integer(10) relations: Parent: class: Forum_Entry local: parent_entry_id foreign: id Thread: class: Forum_Thread local: thread_id foreign: id Forum_Thread: columns: board_id: integer(10) updated: integer(10) closed: integer(1) relations: Board: class: Forum_Board local: board_id foreign: id Entries: class: Forum_Entry local: id foreign: thread_id How to modify this schema, to use NestedSet (Tree structure of threads and entries)?

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Problems and solution for Developing a connected web and desktop application?

- by Taz

hi, I am trying to develop a web application(Using ASP.NET and c#) that uses a specific database hosted on web server. I will have another desktop application that will use a local database. Both databases have same structure and data at start up. Then databases will change when users add data to web application and an employee adds data to the desktop application. After a while I have to sync both databases. What will be best way to do this? Is there any opensource example/ starter kit to start with? Thanks.

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cakephp find with ID inArray

- by user331321

Hi! i have this tables: Clients (id, name, addrees, group,...) Services_Clients (id, client_id, login,passwd) documents (id,client_id,date,path) clients must be in a group or not, and i can not change the database structure. 1) In a login form, by user/passwd i get an client group 2) after that a get all the clients id from that group like this $jur = $this-Client-find('all', array('conditions' = array('Client.group'=$group['Client']['group']))); ok, now, i need to get all documents from the clients of that group, so... how can i achive that? i need to find in my model but getting only with IDs on $jur variable sorry about my english...

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speed up the speed of a sql query to mysql?

- by fayer

in my mysql database i've got the geonames database, containing all countries, states and cities. i am using this to create a cascading menu so the user could select where he is from: country - state - county - city. but the main problem is that the query will search through all the 7 millions rows in that table each time i want to get the list of children rows, and that is taking a while 10-15 seconds. i wonder how i could speed this up: caching? table views? reorganizing table structure somehow? and most important, how do i do these things? are there good tutorials you could link to me? i appreciate all help and feedback discussing smart ways of handling this issue!

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Removing duplicate SQL records to permit a unique key

- by j pimmel

I have a table ('sales') in a MYSQL DB which should have rightfully have had a unique constraint enforced to prevent duplicates. To first remove the dupes and set the constraint is proving a bit tricky. Table structure (simplified): 'id (unique, autoinc)' product_id The goal is to enforce uniqueness for product_id. The de-duping policy I want to apply is to remove all duplicate records except the most recently created, eg: the highest id Or to put another way, I would like to delete duplicate records, excluding the ids matched by the following query: select id from sales s inner join (select product_id, max(id) as maxId from sales group by product_id having count(product_id) > 1) groupedByProdId on s.product_id and s.id = groupedByProdId.maxId I've struggled with this on two fronts - writing the query to select the correct records to delete and then also the constraint in MYSQL where a subselect FROM clause of a DELETE cannot reference the same table from which data is being removed.

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Visual Studio creating bin/ folder in wrong location.

- by Joviee

In Visual Studio 2008, I have a solution with a number of projects. Each project has the same build output path of "..\bin\Debug\" for debug, and "..\bin\Release\" for release. So the directory structure looks like this: solution\ bin\ project1\ project2\ project3\ This all works fine, all the assemblies go to the correct location when I build the project, etc. Howevever, when I first open the solution in Visual Studio, an empty bin folder is created one level up from where it should. So I am getting: bin\ solution\ bin\ project1\ project2\ project3\ This folder is only created when I first open the solution. Never when I build. I have looked through the .sln and every .csproj file, and I cannot work out why this folder is being created. So, my questions are: a) Why is this bin folder being created? b) How do I stop Visual Studio from creating this bin folder?

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Python: Importing a file from a parent folder

- by Sascha

...Now I know this question has been asked many times & I have looked at these other threads. Nothing so far has worked, from using sys.path.append('.') to just import foo I have a python file that wishes to import a file (that is in its parent directory). Can you help me figure out how my child file can successfully import its a file in its parent directory. I am using python 2.7 The structure is like so (each directory also has the __init__.py file in it): StockTracker/ __Comp/ ____a.py ____SubComp/ ______b.py Inside b.py, I would like to import a.py: So I have tried each of the following but I still get an error inside b.py saying "There is no such module a" import a import .a import Comp.a import StockTracker.Comp.a import os import sys sys.path.append('.') import a sys.path.remove('.')

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Problem with Eclipse and a Maven multi-module project

- by earth

I have created a Maven project with the following structure: + root-project pom.xml (pom) + sub-projectA (jar) + sub-projectB (jar) I have done the following steps: mvn archetype:create –DgroupId=my.group.id –DartifactId=root-project mvn archetype:create –DgroupId=my.group.id –DartifactId=sub-projectA mvn archetype:create –DgroupId=my.group.id –DartifactId=sub-projectB So I have, obviously, in the top-level pom.xml the following elements: <modules> <module>sub-projectA</module> <module>sub-projectB</module> </modules> The last step was: mvn eclipse:clean eclipse:eclipse Now if I import the root-project in Eclipse, it seems to look at my projects as resources and not like java projects. However if I import each of child projects sub-projectA and sub-projectB, it looks them like java projects. This is a big problem for me because I have a deeper hierarchy. Any help would be appreciated!

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php - regex - catch string inside multiple tags

- by aSeptik

Hi all guys! still on regex! ;-))) Assuming we have an html file with a lot of <tr> rows with same structure like this below, where (.*?) is the content i need to extract! <tr align= # ><th width= # ><a OnClick="(.*?)"href= # >(.*?)</a><td width= # >(.*?)<td width= # align= # >(.*?)</td></tr> maybe with a nice preg_match_all() ? thanks for the time! Luca Filosofi!

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Displaying mysql results as an object?

- by Michael

If I have a database with the structure: ___id_____|____value____ 1 | value1 2 | value2 3 | value3 How can I pull data from this MySQL database in PHP and have it formatted like this: Array ( [0] => stdClass Object ( [id] => 1 [value] => value1 ) [1] => stdClass Object ( [id] => 2 [value] => value2 ) [2] => stdClass Object ( [id] => 3 [value] => value3 ) )

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