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  • SQL join: where clause vs. on clause

    - by BCS
    After reading it, this is not a duplicate of Explicit vs Implicit SQL Joins. The answer may be related (or even the same) but the question is different. What is the difference and what should go in each? If I understand the theory correctly, the query optimizer should be able to use both interchangeably.

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  • Can you configure Spring-Security programmatically?

    - by jschoen
    I am working to configure Spring-Security with an existing application, for just basic security (i.e. what pages a user can see based on their roles). The question came up wondering if we could set what roles are required for each page in java instead of the ApplicationContext.xml. The idea is to store them in a table in our database, so we can easily change them with out a redeployment. Is this possible? How?

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  • What's the point of Mono on Windows

    - by Adam Haile
    This may be a dumb question...but I was just looking into the Mono project and they have a section about installing Mono on Windows. But, since Windows obviously already has the .NET runtime can anyone tell me what exactly is the point of having Mono for Windows? Does it help with cross platform development or something?

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  • Are there any tools for performing static analysis of Scala code?

    - by Roman Kagan
    Are there any tools for performing static analysis of Scala code, similar to FindBugs and PMD for Java or Splint for C/C++? I know that FindBugs works on the bytecode produced by compiling Java, so I'm curious as to how it would work on Scala. Google searches (as of 27 October 2009) reveal very little. Google searches (as of 01 February 2010) reveal this question.

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  • Date arithmetic using integer values

    - by Dave Jarvis
    Problem String concatenation is slowing down a query: date(extract(YEAR FROM m.taken)||'-1-1') d1, date(extract(YEAR FROM m.taken)||'-1-31') d2 This is realized in code as part of a string, which follows (where the p_ variables are integers): date(extract(YEAR FROM m.taken)||''-'||p_month1||'-'||p_day1||''') d1, date(extract(YEAR FROM m.taken)||''-'||p_month2||'-'||p_day2||''') d2 This part of the query runs in 3.2 seconds with the dates, and 1.5 seconds without, leading me to believe there is ample room for improvement. Question What is a better way to create the date (presumably without concatenation)? Many thanks!

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  • How do I reconnect to Memcache when forking in rails?

    - by Daniel Huckstep
    I have a rails 3 application, and a script called by rails runner. This script forks and does some stuff in other processes. I do the proper thing with ActiveRecord before forking, where I disconnect-fork-reconnect and all that jazz. My question is I also use memcache for the Rails.cache but should I be disconnecting-reconnecting that too for my forks? If so, how would I go about that in the rails way.

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  • The key must be an application-specific resource id.

    - by Pentium10
    Why do I get this Exception? 05-18 20:29:38.044: ERROR/AndroidRuntime(5453): java.lang.IllegalArgumentException: The key must be an application-specific resource id. 05-18 20:29:38.044: ERROR/AndroidRuntime(5453): at android.view.View.setTag(View.java:7704) 05-18 20:29:38.044: ERROR/AndroidRuntime(5453): at com.mypkg.viewP.inflateRow(viewP.java:518) the line in question is: ((Button) row.findViewById(R.id.btnPickContact)).setTag(TAG_ONLINE_ID,objContact.onlineid); and I have it defined as: private static final int TAG_ONLINE_ID = 1;

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  • How to implement " char * ftoa(float num) " without sprintf() library function in C, C++ and JAVA

    - by SIVA
    Today I appeared for an interview, and the question was writing my own "char * ftoa(float num) " in C, C++ and Java. Yes, I know float numbers follow IEEE standard while allocating their memory, but I don't know float to char conversion by using Mantissa and Exponent in C. I don't have any idea to solve the above problem in C++ and JAVA. I/P to the ftoa(): 1.23 O/P from the ftoa(): 1.23 (char format). Thanks in advance ...

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  • nutch spell checker | nutch navigation filter

    - by Sascha
    Hello, i am try to configure the nutch 1.0 search engine. First i need to integrate a spell checker or somthing like this, is there a plugin available? My next question is, how to rule out html tag like "", so that navigation is not a part of the index? thanks for all answers

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  • skeleton in MATLAB

    - by AZIRAR
    The objective of skeletonization is to represent a binary image with a minimum set of pixels. The skeleton must account for geometrical properties of the form and retain associative relationships. My question here is how can i get a skeleton from binary image ?

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  • Favorite Django Tips & Features?

    - by Haes
    Inspired by the question series 'Hidden features of ...', I am curious to hear about your favorite Django tips or lesser known but useful features you know of. Please, include only one tip per answer. Add Django version requirements if there are any.

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  • Provable planarity of flowcharts

    - by Nikolaos Kavvadias
    Hi all I have a question: is there any reference (e.g. paper) with a proof of the planarity of flowchart layouts? Can anyone suggest an algorithm for generating flowchart (planar) layouts? I know that there are some code-to-flowchart tools out there, but i'm unaware of their internals. Thanks in advance -kavi

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  • Legacy code - when to move on

    - by Mmarquee
    My team and support a large number of legacy applications all of which are currently functional but problematic to support and maintain. They all depend on code that the compiler manufacture has officially no support for. So the question is should we leave the code as is, and risk a new compiler breaking our code, or should we bite the bullet and update all the code?

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  • Neural Network: Handling unavailable inputs (missing or incomplete data)

    - by Mike
    Hopefully the last NN question you'll get from me this weekend, but here goes :) Is there a way to handle an input that you "don't always know"... so it doesn't affect the weightings somehow? Soo... if I ask someone if they are male or female and they would not like to answer, is there a way to disregard this input? Perhaps by placing it squarely in the centre? (assuming 1,0 inputs at 0.5?) Thanks

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  • Docking *inside* an editor

    - by Andy Thomas-Cramer
    I have a document type which has multiple presentations. Say I want to display the document in an RCP editor with a customizable subset of those presentations, in a layout chosen by the user. One option that has come up is docking-like behavior for the panels inside an individual editor, with drag-and-drop, resizing, closing, maybe rollover and floating. Clearly this would need usability testing, but my question here is of feasibility. Are there any existing libraries or e4 plans to support behavior like this?

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  • Addin to Visual Studio for visualizing a selected json string in the editor

    - by Larsi
    Hi! I've got a lot of xml files, and embedded in some elements there are json serialized objects. They are quite difficult to read and modify. So question is: Are there any Visual Studio addins availible that can take selected json-text in the editor, and visualize it (and maybe even allow for editing)? if not, if I must build it - are there any good starting points or samples availible? (making a right-click command availible when text is selected, and them showing a popup) Regards Larsi

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  • eclipse: Dynamic web project: linked WebContent folder?

    - by jeff porter
    Hello all, I'm trying to change a java project into a Dynamic web project, unfortunatly the project looks nothing like what it needs to easily move to a Dynamic web project. So, my question is... Change I change the "WebContent" directory to a linked folder? So that I can change the "WebContent" folder from C:\tools\eclipse_galiloe\workspace\Test\WebContent to C:\project\jsps Thanks!

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  • Understanding Async Methods in Web Service.

    - by Polaris
    Hello. I consume Java Service in my .NET appliaction. I have one question: When service serialize in .NET he also create Async methods. For example for GetPersons() method service create GetPersonsAsync() which is return void. In which cases I can use this Async methods and what the destination of these methods.

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