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  • mysql delete and foreign key constraint

    - by user121196
    I'm deleting selected rows from both table in MYSQL, the two tables have foreign keys. delete d,b from A as b inner join B as d on b.bid=d.bid where b.name like '%xxxx%'; MYSQL complains about foreign keys even though I'm trying to delete from both tables: Error: Cannot delete or update a parent row: a foreign key constraint fails (yyy/d, CONSTRAINT fk_d_bid FOREIGN KEY (bid) REFERENCES b (bid) ON DELETE NO ACTION ON UPDATE NO ACTION) what's the best solution here to delete from both table?

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  • Cache like stackoverflow

    - by Deumber
    I'm creating a ASP.NET MVC 2 application that envolve a section like questions here in stackoverflow (mine is with exams is another kind of application but can be extrapolate to same general idea of SO). OK I'm creating a cache per page, its mean something like this: [OutputCache(Duration=60, VaryByParam="page")] ActionResult AllQuestions(int page){...} But i want to invalidate that cache when a new question is created. What can i do. I'm open to suggestions, perhaps this is not the best way to solve this problem

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  • What tools do you use to share knowledge amongst developers in your company?

    - by Chris Ross
    I'm looking for some good tools that help to share tips, best practices, company standards, etc. amongs developers in my company. Two tools I'm currently considering are a wiki (screwturn wiki) or Sharepoint 2010. I'm wondering if there is something better suited to the task, or any input anyone has on this subject. I'd prefer something that's windows based (i.e. runs on IIS, can authenticate users against Active Directory etc) but I am open to anything.

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  • Is there a better way than a sequence of if's to handle events?

    - by Matt
    I recently ran across several objects implemented to handle events with a hard coded mapping using this pattern: public void handleEvent(Event event) { if(event.getCode() == SOME_STATIC_EVENT) doSomething(event); if(event.getCode() == ANOTHER_STATIC_EVENT) doSomethingElse(event); } where doSomething functions are implemented as methods of the same class. In hopes of striving for looser coupling, how would you suggest abstracting out this pattern? Also, what's the best approach for mapping 0..N functions to a fired event?

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  • How to choose between UUIDs, autoincrement/sequence keys and sequence tables for database primary keys?

    - by Tim
    I'm looking at the pros and cons of these three primary methods of coming up with primary keys for database rows. So assuming I am using a database that supports more than one of these methods, is there a simple heuristic to determine what the best option would be for me? How do considerations such a distributed/multiple masters, performance requirements, ORM use, security and testing have on the choice? Any unexpected drawbacks that one might run into?

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  • Why does Eclipse crash with Xmx, XX:MaxPermSize above certain values?

    - by alex
    Running Eclipse 3.5.1, JDK 1.6.0_17 on WinXP SP3 32Bit with 3.5 gigs of RAM. I'm aware of the known Eclipse best practices, still trying to figure out eclipse.ini. This will launch: -Xmx588m and this won't: -Xmx589m. Same with -XX:MaxPermSize. Anything above -XX:MaxPermSize=140m won't launch. The screen of death is simlar to this (taken from here). Any ideas on why might this be happening?

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  • == and === operators in php

    - by Lizard
    Lets say I have a variable that will always be a string. Now take the code below: if($myVar === "teststring") Note $myVar will always be a string, so my questions is Which is quicker/best, using === (Indentity) or the == (Equality)?

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  • removing elements incrementally from a list

    - by Javier
    Dear all, I've a list of float numbers and I would like to delete incrementally a set of elements in a given range of indexes, sth. like: for j in range(beginIndex, endIndex+1): print ("remove [%d] => val: %g" % (j, myList[j])) del myList[j] However, since I'm iterating over the same list, the indexes (range) are not valid any more for the new list. Does anybody has some suggestions on how to delete the elements properly? Best wishes

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  • How can I set the order of the positive and negative buttons in AlertDialog?

    - by Micah Hainline
    Why I want to do this is another discussion entirely, but I need to figure out the best way to make all my alert dialogs have the positive button on the right side. Note that in version 3.0 and below the buttons normally appear as OK / Cancel and in 4.0 and above it is Cancel / OK. I want to force my application to use Cancel / OK in the simplest way possible. I have a lot of AlertDialogs in the application.

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  • Override jre_lib classes

    - by Filip
    What is the best way to override jre_lib classes? Let's say I need to store all ArrayLists not in RAM but on disk or anywhere else. I wanna write my own ArrayList class to code this functionality and make sure that every instantiations of ArrayList use my class. I thought about class loading mechanism to change order of classpath, but as I see java checks standard classes first.

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  • Feature Selection methods in MATLAB?

    - by Hossein
    Hi, I am trying to do some text classification with SVMs in MATLAB and really would to know if MATLAB has any methods for feature selection(Chi Sq.,MI,....), For the reason that I wan to try various methods and keeping the best method, I don't have time to implement all of them. That's why I am looking for such methods in MATLAB.Does any one know?

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  • Visual Studio 2010 is messing with my references

    - by zachary
    I have a dll in the GAC. I browse to this same dll in a different place then referenced in the GAC using the file dialog of add reference. Visual studio repoints it to the gac location. Boom my build blows up on the build server that doesn't have this dll in the gac or at that location. What is the best way to fix this?

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  • read Number from text file using CPP stream

    - by Yongwei Xing
    Hi all I have a text file like below 2 1 2 5 10 13 11 12 14 2 0 1 2 99 2 200 2 1 5 5 1 2 3 4 5 1 0 0 0 I want to read file line by line, and read the umbers from each line. I know how to use the stream to read a fixed field line, but what about the non-fixed line? Best Regards,

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  • Saving a Django form to a csv file

    - by Oli
    I have a Django form that is working fine. I'd like to save the data it submits to a CSV file. Is there a "best practice" way to do this? I need to include blank fields in the CSV file where the user has not filled in a "required=False" field

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  • Alternatives to LIMIT and OFFSET for paging in Oracle

    - by depr001
    Hello, I'm developing a web application and need to page ordered results. I normaly use LIMIT/OFFSET for this purpose. Which is the best way to page ordered results in Oracle? I've seen some samples using rownum and subqueries. Is that the way? Could you give me a sample for translating this SQL to Oracle: SELECT fieldA,fieldB FROM table ORDER BY fieldA OFFSET 5 LIMIT 14 (I'm using Oracle 10g, for what it's worth) Thanks!

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  • cookie not getting tracked why?

    - by user158721
    hi, on one domain i use command as:: setcookie( "cookiename", "cookievalue", expires after two days, "/", "domain1.com" ); on other domain i used a pixel code as that url not able to read cookie , but the same url able to read cookie when it is called directly. when i put htat url as a pixel code on other domain . it is not able to read value. what might be the problem for this ?? Best Regards, Satish Kalepu

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  • the selector in JavaScript

    - by Small Wolf
    I want to get the object of this code , <input class="radio" id="conversation_sub_kind_id_208" name="conversation[sub_kind_id]" onclick="set_department_name('department_name208')" type="radio" value="208" /> I want to use jQuery Framework to get the object, like the document.getElementbyTagName("conv..."); what should i do in here? Thank you, and best regards!

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  • How to have multiple parts of a website in one page

    - by stas
    I want to make a website that will have multiple pages, but because of a unique navigation bar, I cannot simply link to a new file for each page. What is the best way to accomplish this. Some possibilities that I can think of are having all of them on one page, but using css and javascript to move the other pages offscreen, or using iframes and loading them with javascript. Could someone please direct me to some examples or tutorials?

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