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• SQL Get Latest Unique Rows

  - by Simpleton

  I have a log table, each row representing an object logging its state. Each object has a unique, unchanging GUID. There are multiple objects logging their states, so there will be thousands of entries, with objects continually inserting new logs. Everytime an object checks in, it is via an INSERT. I have the PrimaryKey, GUID, ObjectState, and LogDate columns in tblObjects. I want to select the latest (by datetime) log entry for each unique GUID from tblObjects, in effect a 'snapshot' of all the objects. How can this be accomplished?

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• How to implement parent-child windows and pass values from child to parent?

  - by Andrew

  I am working on an ASP.NET MVC 2 application. In one of my data entry forms, I have an "employer" field which has a "search" link next to it. When a user clicks on this link, another window is opened with a search form. The user uses the search form to search for the correct employer. A list of employers is shown to the user. Currently, the user has to then copy and paste the correct employer from the child window into the original window. I want to implement it so that each employer search result in the child window is a hyperlink. The user would then click on the correct employer and then the correct employer value would be populated in the original parent window employer field. How would I go about implementing this in ASP.NET MVC 2?

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• Hibernate configuration - session factory scanning?

  - by Marcus

  We have this hibernate.cfg.xml file. Is there a way to tell Hibernate to just scan a directory instead of having to add an entry here for each class? <hibernate-configuration> <session-factory> <mapping class="com.abc.domain.model.A" /> <mapping class="com.abc.domain.model.B" /> <mapping class="com.abc.domain.model.C" /> <mapping class="com.abc.domain.model.D" /> <mapping class="com.abc.domain.model.E" /> </session-factory> </hibernate-configuration>

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• Log with timestamps that have millisecond accuracy & resolution in Windows C++

  - by Psychic

  I'm aware that for timing accuracy, functions like timeGetTime, timeBeginPeriod, QueryPerformanceCounter etc are great, giving both good resolution & accuracy, but only based on time-since-boot, with no direct link to clock time. However, I don't want to time events as such. I want to be able to produce an exact timestamp (local time) so that I can display it in a log file, eg 31-12-2010 12:38:35.345, for each entry made. (I need the millisecond accuracy) The standard Windows time functions, like GetLocalTime, whilst they give millisecond values, don't have millisecond resolution, depending on the OS running. I'm using XP, so I can't expect much better than about a 15ms resolution. What I need is a way to get the best of both worlds, without creating a large overhead to get the required output. Overly large methods/calculations would mean that the logger would start to eat up too much time during its operation. What would be the best/simplest way to do this?

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• What is the difference between the add and offer methods in a queue?

  - by Finbarr

  Take the PriorityQueue for example http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html#offer(E) According to the Collection API entry http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html the add method will often seek to ensure that an element exists within the Collection rather than adding duplicates. So my question is, what is the difference between the add and offer methods? Is it that the Offer method will add duplicates regardless? (I doubt that it is because if a Collection should only have distinct elements this would circumvent that).

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• @SequenceGenerator - allocationSize, reverse engineering with Eclipse Hibernate Tools

  - by Spooky

  I use the Eclipse Hibernate Tools to create domain classes with JPA annotations from my Oracle database. To control sequence generation I have added the following entry to the hibernate.reveng.xml: ... <primary-key> <generator class="sequence"> <param name="sequence">SEQ_FOO_ID</param> </generator> </primary-key> ... This results in the following annotation: @SequenceGenerator(name = "generator", sequenceName = "SEQ_FOO_ID") However I need to set the "allocationSize" like this: @SequenceGenerator(name = "generator", sequenceName = "SEQ_FOO_ID", allocationSize = 1) Is it possible to set this somehow in the hibernate.reveng.xml?

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• Problem with onscreen keyboard on Droid

  - by mudit

  Hi all i am developing an application which has a general text entry form. So while testing on my moto droid, i am facing a strange issue-- when i touch an input field ( which is at lower end of the screen) -- the on screen keyboard pops up and hides the input field. So user have to enter blindly. So is this a sdk issue OR it is particular for droids OR am i doing something wrong??? I have tested this same form on G1, Hero..i see no issues at all. Please help...

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• Splitting a string into new rows in R

  - by user3703195

  I have a data set like below: Country Region Molecule Item Code IND NA PB102 FR206985511 THAI AP PB103 BA-107603 / F000113361 / 107603 LUXE NA PB105 1012701 / SGP-1012701 / F041701000 IND AP PB106 AU206985211 / CA-F206985211 THAI HP PB107 F034702000 / 1010701 / SGP-1010701 BANG NA PB108 F000007970/25781/20009021 I want to split based the string values in ITEMCODE column on / and create a new row for each entry. For instance, the desired output will be: Country Region Molecule Item Code New row IND NA PB102 FR206985511 FR206985511 THAI AP PB103 BA-107603 / F000113361 / 107603 F000113361 107603 BA-107603 LUXE NA PB105 1012701 / SP-1012701 / F041701000 1012701 SP-1012701 F041701000 IND AP PB106 AU206985211 / CA-F206985211 AU206985211 CA-F206985211 THAI HP PB107 F034702000 / 1010701 / SP-1010701 F034702000 1010701 SP-1010701 BANG NA PB108 F000007970/25781/20009021 F000007970 25781 20009021 I tried the below code library(splitstackshape) df2=concat.split.multiple(df1,"Plant.Item.Code","/", direction="long") but got the Error "Error: memory exhausted (limit reached?)" When i tried strsplit() i got the below error message. Error in strsplit(df1$Plant.Item.Code, "/") : non-character argument Any help from you will be appreciated.

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• How can I make Access combo boxes unfurl on arrow key down?

  - by Matt Parker

  With combo box controls, I'm used to being able tab to them, click the down arrow key to open up the options, and then use the up and down arrow keys to navigate those options. In an Access form I've designed, pressing down while a combo box is active moves to the next control. I already have tab for that, so how can I get the down arrow to behave as I expect? These combo boxes are the only thing between me and a mouse-free form, which I consider essential for data entry. Thanks in advance for your help!

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• CakePHP - radio button not showing error message

  - by teepusink

  Hi, I'm unable to get the error message to show up when creating a radio form using the CakePHP form helper. This is what I have now. $options=array('active'=>'Active','inactive'=>'Inactive'); echo $form->input('Status', array( 'type' => 'radio', 'id' => 'EntryStatus', 'name' => 'data[Entry][status]', 'options' => $options )); What am I missing? I'm using CakePHP 1.2.7 and this is what I have in the validation 'status' = array( 'notempty' = array( 'rule' = 'notempty', 'required' = true, 'message' = 'yo' ) ) Tried the answer from http://stackoverflow.com/questions/1388823/form-helper-for-creating-radio-button-in-cakephp and it's giving me a select option form instead. Thanks, Tee

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• Visual Studio 2008 resolving wrong reference

  - by e28Makaveli

  In my project file, I have the following entry: <Reference Include="Microsoft.Practices.Unity, Version=1.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> <HintPath>..\..\..\..\Libraries\Microsoft.Practices.Unity.dll</HintPath> </Reference> which in absolute terms translates to: C:\dev\LUT600 2.1.1\OCC600\Libraries Somehow, when I try to compile the project, Visual Studio loads a reference from a totally different path: /reference:"C:\Program Files\Microsoft Enterprise Library 4.1 - October 2008\Bin\Microsoft.Practices.Unity.dll. How it resolves to this location is a complete mystery as this DLL is not referenced anywhere in this project. I have set Specific Verion to true but it still resolves the reference from this location. Any ideas? TIA. Klaus

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• Using CreateFileMapping between two programs - C

  - by Jamie Keeling

  Hello, I have two window form applications written in C, one holds a struct consisting of two integers, another will receive it using the CreateFileMapping. Although not directly related I want to have three events in place so each of the processes can "speak" to each other, one saying that the first program has something to pass to the second, one saying the first one has closed and another saying the second one has closed. What would be the best way about doing this exactly? I've looked at the MSDN entry for the CreateFileMapping operation but I'm still not sure as to how it should be done. I didn't want to start implementing it without having some sort of clear idea as to what I need to do. Thanks for your time.

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• Why getting active record error when trying to work on arrays?

  - by keruilin

  I have the following association in my User model: has_and_belongs_to_many :friends, :class_name => 'User', :foreign_key => 'friend_id' I have the following uniqueness constraint in my user_users table: UNIQUE KEY `no_duplicate_friends` (`user_id`,`friend_id`) In my code, I am retrieving a user's friends -- friends = user.friends. friends is an array. I have a scenario where I want add the user with all those friends to the friends array. Ex: friends << user_with_all_those_homies However, I get the following error: ActiveRecord::StatementInvalid: Mysql::Error: Duplicate entry '18-18' for key 'no_duplicate_friends': INSERT INTO `users_users` (`friend_id`, `user_id`) VALUES (18, 18) What gives?

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• Configurability for windows application built in C#

  - by Sam

  Hi, I am working on a windows application which is developed in C#. I am kinda new in windows world. I want to restrict number of parallel threads running for this application at a given point of time. This number can be changed by user on a beefier machine. What is the best way to do this configuration and how it can be achieved. I can think of following approaches. 1. Use ConfigurationManager to read the configuration value. If user exists more than N number of threads show a message and give option there to modify the value of N. 2. Use registery entry? Thanks in Advance! Sam

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• In Ruby Compare 2 lines in a log file which BOTH contain the SAME "WORD" but ONLY print out the line

  - by kamal

  here are sample lines Apr 9 11:53:26 skip [2244]: [2244] ab-cd-ef:cc [INFO] A recoverable error has occurred some other log lines .. .... Apr 9 12:53:26 skip [2244]: [2244] ab-cd-ef:cc [INFO] A recoverable error has occurred now the LATEST line would have to be one with the latest Date String, and THAT is the one that needs to be printed, plus the NEXT time the parser runs on the log file, somehow the previous LATEST line has to be compared with the Existing latest one, and it CAN e the case, that NOTHING Changed and the OLD line is STILL the latest one, OR there is a NEW line, but ONLY the NEW log line should be printed and NOT if there is NO NEW log Entry.

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• REST - why we need million urls and different HTTP request?

  - by Andre

  I asked this question. But I still don't understand why we need to utilize different HTTP requests: DELETE/PUT/POST/GET in order to build nice API Wouldn't it be a lot simpler to pass all information in request parameters and have a SINGLE ENTRY-POINT for your api?: GET www.example.com/api?id=1&method=delete&returnformat=JSON GET www.example.com/api?id=1&method=delete&returnformat=XML or POST www.example.com/api {post data: id=1&method=delete&returnformat=JSON} POST www.example.com/api {post data: id=1&method=delete&returnformat=XML} and then - we can handle all methods and data internally without the need for hundreds of urls... how would you call this type of API - It's not REST apparently, it's not SOAP. then - what is it? UPDATE I'm not proposing any new standards here. I merely asking a question in order to better understand why web services work the way they work.

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• How do I programmatically set property of control in aspx file ?

  - by Thomas Wanner

  This may be a very dumb question but I can't seem to get it working. I use at many places the following syntax for dynamically binding a property of a control in aspx file to the resource entry, e.g. <SomeFunnyControl Text="<%$ Resources : ResClass, ResEntry %>" /> I want to do a similar thing with a class containing some constants, something like <SomeFunnyControl Text="<%= MyConstantsClass.MyStringConstant %>" /> But this doesn't seem to work, it simply sets the text to the exact expression without evaluating it. I am using ASP.NET 3.5 btw. I have tried the databinding approach but I get an HttpParseException saying Databinding expressions are only supported on objects that have a DataBinding event.

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• spring mvc forward to jsp

  - by jerluc

  I currently have my web.xml configured to catch 404s and send them to my spring controller which will perform a search given the original URL request. The functionality is all there as far as the catch and search go, however the trouble begins to arise when I try to return a view. <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver" p:order="1"> <property name="mediaTypes"> <map> <entry key="json" value="application/json" /> <entry key="jsp" value="text/html" /> </map> </property> <property name="defaultContentType" value="application/json" /> <property name="favorPathExtension" value="true" /> <property name="viewResolvers"> <list> <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" /> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value="" /> </bean> </list> </property> <property name="defaultViews"> <list> <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" /> </list> </property> <property name="ignoreAcceptHeader" value="true" /> </bean> This is a snippet from my MVC config file. The problem lies in resolving the view's path to the /WEB-INF/jsp/ directory. Using a logger in my JBoss setup, I can see that when I test this search controller by going to a non-existent page, the following occurs: Server can't find the request Request is sent to 404 error page (in this case my search controller) Search controller performs search Search controller returns view name (for this illustration, we'll assume test.jsp is returned) Based off of server logger, I can see that org.springframework.web.servlet.view.JstlView is initialized once my search controller returns the view name (so I can assume it is being picked up correctly by the InternalResourceViewResolver) Server attempts to return content to browser resulting in a 404! A couple things confuse me about this: I'm not 100% sure why this isn't resolving when test.jsp clearly exists under the /WEB-INF/jsp/ directory. Even if there was some other problem, why would this result in a 404? Shouldn't a 404 error page that results in another 404 theoretically create an infinite loop? Thanks for any help or pointers! Controller class [incomplete]: @Controller public class SiteMapController { //-------------------------------------------------------------------------------------- @Autowired(required=true) private SearchService search; @Autowired(required=true) private CatalogService catalog; //-------------------------------------------------------------------------------------- @RequestMapping(value = "/sitemap", method = RequestMethod.GET) public String sitemap (HttpServletRequest request, HttpServletResponse response) { String forwardPath = ""; try { long startTime = System.nanoTime() / 1000000; String pathQuery = (String) request.getAttribute("javax.servlet.error.request_uri"); Scanner pathScanner = new Scanner(pathQuery).useDelimiter("\\/"); String context = pathScanner.next(); List<ProductLightDTO> results = new ArrayList<ProductLightDTO>(); StringBuilder query = new StringBuilder(); String currentValue; while (pathScanner.hasNext()) { currentValue = pathScanner.next().toLowerCase(); System.out.println(currentValue); if (query.length() > 0) query.append(" AND "); if (currentValue.contains("-")) { query.append("\""); query.append(currentValue.replace("-", " ")); query.append("\""); } else { query.append(currentValue + "*"); } } //results.addAll(this.doSearch(query.toString())); System.out.println("Request: " + pathQuery); System.out.println("Built Query:" + query.toString()); //System.out.println("Result size: " + results.size()); long totalTime = (System.nanoTime() / 1000000) - startTime; System.out.println("Total TTP: " + totalTime + "ms"); if (results == null || results.size() == 0) { forwardPath = "home.jsp"; } else if (results.size() == 1) { forwardPath = "product.jsp"; } else { forwardPath = "category.jsp"; } } catch (Exception ex) { System.err.println(ex); } System.out.println("Returning view: " + forwardPath); return forwardPath; } }

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• GWT tries to load a deleted module

  - by Dmitry

  I am using Eclispe with Google plugin for AppEngine and GWT. Recently I created a test GWT module, but eventually it has been deleted from the project and I can not find any sign of it in the project now. However, whenever I run the web app locally, I get in console the following message: Loading modules com.piq.exemity.Test [ERROR] Unable to find 'com/XXXXXX/Test.gwt.xml' on your classpath; could be a typo, or maybe you forgot to include a classpath entry for source? Has anyone got any idea where it can be hiding?

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• How to call an event when the user "finally" selects an item in a list?

  - by herzmeister der welten

  When a user clicks once on an item in a Grid or a ListBox, that item is usually selected, hence most UI frameworks have a onSelected event or the like for that. However, how can we generally call the next step when a user "finally" selects an item by e.g. double clicking an entry? You know when some popup might appear in the context of the selected item and the user can do further stuff. Strangely enough, I think I have never seen a word for that in any UI framework. onPicked, onAccepted, onChosen, onFinallySelected, onResult? All kinda awkward or too special. Any other ideas?

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• extra AuthorizationRule in web.config AuthorizationSection

  - by H07R0D

  I'm trying to modify the list of allowed users in web.config from a codebehind. <authorization> <allow users="alice, bob"/> <deny users="*"/> </authorization> I successfully retrieve the section I need config = WebConfigurationManager.OpenWebConfiguration("~"); authSection = (AuthorizationSection)config.GetSection("system.web/authorization"); When I iterate looking for the allow rule, I get two of them. foreach (AuthorizationRule rule in authSection.Rules) { if (rule.Action == AuthorizationRuleAction.Allow) { // manage the Users StringCollection } } The first item I get has 'alice' and 'bob' in the Users collection. The SECOND item I get has * Where is this second entry coming from? This is an Allow Rule, not a Deny rule. I could understand the * from a Deny rule. Is there some extra inheritance I'm not aware of?

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• (Newbie) Amazon Web Services Apache Server

  - by Samnsparky

  Hello! I am trying to get a feel for the costs imposed by running apache on AWS continually. Assuming that the service is scarcely used, does anyone know how many cpu hours that would eat up in a month just by sitting there and running? I understand that this is slightly impractical but I am trying to figure out what the cost of entry is to deploy an application on this platform (as compared to GAE). I suspect it to be small but I would like to know. Thank you for your help, Sam

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• Function testing on Netbeans 6.8

  - by ron

  While not a torrent, but some articles can be found on the net about function testing (particularly http://blogs.sun.com/geertjan/entry/gui_testing_on_the_netbeans). However the tools mentioned by them do not seem to be maintained, or don't have a plugin working with the most recent version of Netbeans (6.8). Do you have any function test setup for GUI? What is your level of integration into the development process (IDE integration, ant, etc). Additional candy is that Netbeans is not only the IDE, but the GUI app is also developed for Netbeans 6.8 Platform (so I'm mainly interested in GUI testing NB-platform apps, but tips for any Swing apps in general would be a help too).

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• Why is doing a top(1) on an indexed column in SQL Server slow?

  - by reinier

  I'm puzzled by the following. I have a DB with around 10 million rows, and (among other indices) on 1 column (campaignid_int) is an index. Now I have 700k rows where the campaignid is indeed 3835 For all these rows, the connectionid is the same. I just want to find out this connectionid. use messaging_db; SELECT TOP (1) connectionid FROM outgoing_messages WITH (NOLOCK) WHERE (campaignid_int = 3835) Now this query takes approx 30 seconds to perform! I (with my small db knowledge) would expect that it would take any of the rows, and return me that connectionid If I test this same query for a campaign which only has 1 entry, it goes really fast. So the index works. How would I tackle this and why does this not work? edit: estimated execution plan: select (0%) - top (0%) - clustered index scan (100%)

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• quaring larg text file containing JSON objects.

  - by Maciek Sawicki

  Hi, I have few Gigabytes text file in format: {"user_ip":"x.x.x.x", "action_type":"xxx", "action_data":{"some_key":"some_value"...},...} each entry is one line. First I would like to easily find entries for given ip. This part is easy because I can use grep for example. However even for this I would like to find better solution because I would like to get response as fast as possible. Next part is more complicated because I would like to find entries from selected ip and of selected type and with particular value of some_key in action_data. Probably I would have to convert this file to SQL db (probably SQLite, because it will be desktop APP), but I would ask if there are exists better solutions?

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