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  • Log files legal aspect?

    - by relwarc
    I like data. That is why I add a standalone PHP script which logs all relevant HTTP variables like: Date of visit IP User-agent Request URI Referer Am I allowed to store all this in non-public text files? Am I allowed to evaluate the data? What am I allowed to do with the log files? Do I have to delete them after some time?

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  • When/Why to use Cascading in SQL Server?

    - by Joel Coehoorn
    When setting up foreign keys in SQL Server, under what circumstances should you have it cascade on delete or update, and what is the reasoning behind it? This probably applies to other databases as well. I'm looking most of all for concrete examples of each scenario, preferably from someone who has used them successfully.

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  • Find all possible starting positions of a regular expression match in perl, including overlapping matches?

    - by jonderry
    Is there a way to find all possible start positions for a regex match in perl? For example, if your regex was "aa" and the text was "aaaa", it would return 0, 1, and 2, instead of, say 0 and 2. Obviously, you could just do something like return the first match, and then delete all characters up to and including that starting character, and perform another search, but I'm hoping for something more efficient.

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  • Operator overloading in generic struct: can I create overloads for specific kinds(?) of generic?

    - by Carson Myers
    I'm defining physical units in C#, using generic structs, and it was going okay until I got the error: One of the parameters of a binary operator must be the containing type when trying to overload the mathematical operators so that they convert between different units. So, I have something like this: public interface ScalarUnit { } public class Duration : ScalarUnit { } public struct Scalar<T> where T : ScalarUnit { public readonly double Value; public Scalar(double Value) { this.Value = Value; } public static implicit operator double(Scalar<T> Value) { return Value.Value; } } public interface VectorUnit { } public class Displacement : VectorUnit { } public class Velocity : VectorUnit { } public struct Vector<T> where T : VectorUnit { #... public static Vector<Velocity> operator /(Vector<Displacement> v1, Scalar<Duration> v2) { return new Vector<Velocity>(v1.Magnitude / v2, v1.Direction); } } There aren't any errors for the + and - operators, where I'm just working on a Vector<T>, but when I substitute a unit for T, suddenly it doesn't like it. Is there a way to make this work? I figured it would work, since Displacement implements the VectorUnit interface, and I have where T : VectorUnit in the struct header. Am I at least on the right track here? I'm new to C# so I have difficulty understanding what's going on sometimes.

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  • Is it compulsory to learn about Data Structures if you want to be a Java/C++ programmer ?

    - by happysoul
    So do I like really need to learn about them ? Isn't there an interesting way to learn about stacks, linked lists, heaps ,etc ? I found it a boring subject. **While posting this question it showed some warning.Am I not allowed to post such a question ? Admins please clarify and I will delete it :/ Warning :: The question you're asking appears subjective and is likely to be closed.

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  • how to use append function in file

    - by sadia
    I want to write in a file but in a way that it should not delete existing data in that file rather it should append that file. Can anybody please help by giving any example related to appending a file? Thank you

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  • remove utf-8 figure spaces with php

    - by Jeroen Beerstra
    I have some xml files with figure spaces in it, I need to remove those with php. The utf-8 code for these is e2 80 a9. If I'm not mistaken php does not seem to like 6 byte utf-8 chars, so far at least I'm unable to find a way to delete the figure spaces with functions like preg_replace. Anybody any tips or even better a solution to this problem?

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  • Flushing JDBC connection pools

    - by Matt
    Does anyone know the best (or any) way to flush a JDBC connection pool? I can't find anything obvious in the documentation. It appears connection pools aren't meant to ever be deleted. My current thought is to delete all DataSources from the hash we store them in, which will trigger our code to make new ones. However, my first attempt throws a ConcurrentModificationException.

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  • nhibernate activerecord lazy collection with custom query

    - by George Polevoy
    What i'm trying to accomplish, is having a temporal soft delete table. table Project(ID int) table ProjectActual(ProjectID int, IsActual bit, ActualAt datetime) Now is it possible to map a collection of actual projects, where project is actual when there is no record in ProjectActual.ProjectID = ID, or the last record sorted by ActualAt descending has IsActual set to 1 (true)?

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  • jquery - clone nth row of a table?

    - by John
    I'm trying to use jquery to clone a table row everytime someone presses the add-row button. Can anyone tell me what's wrong with my code? I'm using HTML + smarty templating language in my view. Here's what my template file looks like: <table> <tr> <td>Description</td> <td>Unit</td> <td>Qty</td> <td>Total</td> <td></td> </tr> <tbody id="entries"> {foreach from=$arrItem item=i name=inv} <tr> <td> <input type="hidden" name="invoice_item_id[]" value="{$i.invoice_item_id}"/> <input type="hidden" name="assignment_id[]" value="{$i.assignment_id}" /> <input type="text" name="description[]" value="{$i.description}"/> </td> <td><input type="text" class="unit_cost" name="unit_cost[]" value="{$i.unit_cost}"/></td> <td><input type="text" class="qty" name="qty[]" value="{$i.qty}"/></td> <td><input type="text" class="cost" name="cost[]" value="{$i.cost}"/></td> <td><a href="javascript:void(0);" class="delete-invoice-item">delete</a></td> </tr> {/foreach} </tbody> <tfoot> <tr><td colspan="5"><input type="button" id="add-row" value="add row" /></td></tr> </tfoot> </table> Here's my Jquery Javascript call, which I know gets fired when I put in an alert() statement. So the problem is with me not knowing how jquery works. $('#add-row').live('click', function() {$('#entries tr:nth-child(0)').clone().appendTo('#entries');}); So what am I doing wrong?

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  • Is it possible to implement events in C++?

    - by acidzombie24
    I wanted to implement a C# event in C++ just to see if i could do it. I got stuck, i know the bottom is wrong but what i realize my biggest problem is... How do i overload the () operator to be whatever is in T in this case int func(float)? I cant? can i? Can i implement a good alternative? #include <deque> using namespace std; typedef int(*MyFunc)(float); template<class T> class MyEvent { deque<T> ls; public: MyEvent& operator +=(T t) { ls.push_back(t); return *this; } }; static int test(float f){return (int)f; } int main(){ MyEvent<MyFunc> e; e += test; }

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  • Rails object based permission/authorization engine?

    - by Vlad
    Hi I want to add "Sharing documents" feature to my app, like in google documents service. As i see: User can: can list/view/create/edit/delete own documents share own document to everyone - its a public document share own document to another user with read-only access share own document to another user with read-write access view list of own documents and users to whom he gave permission to read and write view list of foreign documents view/edit foreign document with read/write permissions Please tell me, which permission/authorization solution is preffered for my task?

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  • May be an IE z-index bug?

    - by baikaishiuc
    Below is my code. when open the page in ie browser, then select the text in div, the text will be replaced by some shadow quad blank . If you delete a line z-index:0, in css class test1, the ie will perform correctly. In my project , the z-index must be set greater than zero, so I couldn't delete the line. I found a solution is to set bg_img.filter = "" when pannel.z-index greater than 0, then ie will also working good. But unfortunately, the bg_img.filter.alpha must be set, too. So how could I do? test .test1 { position:absolute; background:#ffffff; left:20px; top:20px; border:1px solid; width:198px; height:500px; filter: progid:DXImageTransform.Microsoft.Shadow(color="#999999", Direction=135, Strength=5); z-index:0; } </style> <script> function init () { var pannel = document.createElement ('div'); var bg_img = document.createElement ('div'); var head = document.createElement ('div'); pannel.setAttribute('class', 'test1'); pannel.setAttribute('className', 'test1'); bg_img.style.cssText = "position:relative;left:0px;top:0px;" + "width:198px;" + "height:500px;" + "filter:alpha(opacity=100);"; head.style.cssText = "position:absolute;" + "left:0px;" + "top:0px;" + "width:180px;" + "height:20px;"; document.body.appendChild (pannel); pannel.appendChild(bg_img); pannel.appendChild(head); head.innerHTML = "<div>yusutechasdf</div><div>innerhtml</div>" } </script>

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  • const pod and std::vector

    - by Baz
    To get this code to compile: std::vector<Foo> factory() { std::vector<Foo> data; return data; } I have to define my POD like this: struct Foo { const int i; const int j; Foo(const int _i, const int _j): i(_i), j(_j) {} Foo(Foo& foo): i(foo.i), j(foo.j){} Foo operator=(Foo& foo) { Foo f(foo.i, foo.j); return f; } }; Is this the correct approach for defining a pod where I'm not interested in changing the pod members after creation? Why am I forced to define a copy constructor and overload the assignment operator? Is this compatible for different platform implementations of std::vector? Is it wrong in your opinion to have const PODS like this? Should I just leave them as non-const?

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  • Can anyone provide Java program for btree or b+tree???

    - by rohit
    Hi, I am doing a project in which i require btree or b+tree data structure. but its not an important part of project. it would take my time to write a code for it. I googled it but didn't get anything.... So, can anyone provide java code for btree or b+tree implementation (with insert, delete, search algorithms)?????? it should accept string as input and form btree or b+tree of these string.

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  • javancss includes problem

    - by senzacionale
    <javancss srcdir="C:\Projekti\KIS\Model\src" generateReport="true" includes="**/*.java" outputfile="docs/javancss_metrics.xml" format="xml" /> if i use includes="*/.java" then no metrics are calculated. If i delete includes then works. Any idea why?

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  • Killing a thread while deleting an object

    - by viswanathan
    I have an application which does some socket communication with some hardwares. Assume for the particular hardware i have an object and this object intiates a thread which listens on a particular port number say 5001 infinitely until a connection is established. Now if i delete this obect is there anyway by which i can ensure that the thread that is listening on port number 5001 infinitely also gets destroyed.

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  • Efficiently store last X items in an MySQL Database

    - by Saif Bechan
    I want to store the last 3 items in an MySQL database in an efficient way. So when the 4th item is stored the first should be deleted. The way I do this not is first run a query getting the items. Than check what I should do then insert/delete. There has to be a better way to do this. Any suggestions?

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