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  • Updating Linking Tables

    - by Sasha
    I've currently adding a bit of functionality that manages holiday lettings on top of a CMS that runs on PHP and MySQL. The CMS stores the property details on a couple of tables, and I'm adding a third table (letting_times) that will contain information about when people are staying at the property. Basic functionality would allow the user to add new times when a guest is staying, edit the times that the guest is staying and remove the booking if the guest no longer wants to stay at the property. Right now the best way that I can think of updating the times that the property is occupied is to delete all the times contained in the letting_times database and reinsert them again. The only other way that I can think to do this would be to include the table's primary key and do an update if that is present and has a value, otherwise do an insert, but this would not delete rows of data if they are removed. Is there a better way of doing this?

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  • What is an index in MySQL?

    - by Eric
    http://i.imgur.com/JdsUK.jpg I created a table like the picture above. What are the "Indexes"? primary key? unique? It works well without setting indexes.. What do they do? why do I need them? Also, I set all String fields to TEXT because I didn't know how many characters I need. Is this a good idea? I don't see any difference. Thanks!

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  • ASP.NET sets of technologies/components

    - by Maxim Gueivandov
    Just a question of pure curiosity. It happens that development teams tend to stick to the same technological set(s) for some time, for various reasons (obviously, the lack of time, money, necessity and/or willingless to adopt new technologies). So, what are your usual sets of technologies/components to build an ASP.NET application (e.g., WebForms / MVC, Automapper, NInject, NHibernate / LinqToSql, JQuery / ASP.NET Ajax, ...) or architectural frameworks (Arch#, Catharsis, ...) and in which context do you use them (site size, speed/availability requirements, etc.)?

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  • Method hiding with interfaces

    - by fearofawhackplanet
    interface IFoo { int MyReadOnlyVar { get; } } class Foo : IFoo { int MyReadOnlyVar { get; set; } } public IFoo GetFoo() { return new Foo { MyReadOnlyVar = 1 }; } Is the above an acceptable way of implementing a readonly/immutable object? The immutability of IFoo can be broken with a temporary cast to Foo. In general (non-critical) cases, is hiding functionality through interfaces a common pattern? Or is it considered lazy coding? Or even an anti-pattern?

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  • Recommendations for an in memory database vs thread safe data structures

    - by yx
    TLDR: What are the pros/cons of using an in-memory database vs locks and concurrent data structures? I am currently working on an application that has many (possibly remote) displays that collect live data from multiple data sources and renders them on screen in real time. One of the other developers have suggested the use of an in memory database instead of doing it the standard way our other systems behaves, which is to use concurrent hashmaps, queues, arrays, and other objects to store the graphical objects and handling them safely with locks if necessary. His argument is that the DB will lessen the need to worry about concurrency since it will handle read/write locks automatically, and also the DB will offer an easier way to structure the data into as many tables as we need instead of having create hashmaps of hashmaps of lists, etc and keeping track of it all. I do not have much DB experience myself so I am asking fellow SO users what experiences they have had and what are the pros & cons of inserting the DB into the system?

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  • import the data in xls file and open them without Microsoft Excel

    - by user3669577
    I need to perform an application that cath values from SQL database after the esecution of a query. I must import the data in xls file and open them without Microsoft Excel. I'm a beginner and have too many problem. Can anyone help me. This is my code, at the moment: Option Infer On Imports System.Linq Imports System.Data.SqlClient Imports System Imports System.IO Imports System.Drawing Imports System.Drawing.Printing Imports System.Windows.Forms Imports ExcelLibrary.SpreadSheet Public Class frmLottiCaricati Dim CnSql As SqlConnection Private Sub frmLottiCaricati_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Me.MdiParent = Inizio 'TB_MinusValenza.Text = VariazionePrezzi.MinusValenza 'TB_Periodo.Text = VariazionePrezzi.Periodo 'DG_Prodotti.AutoGenerateColumns = False Try Dim StringaSql = "Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=" + Inizio.DatabaseSql + ";Data Source=" + Inizio.ServerSql + ";User ID=" + Inizio.UtenteSql + ";Password=" + Inizio.PwdSql CnSql = New SqlConnection(StringaSql) CnSql.Open() Dim command As SqlCommand Dim dadapter As New SqlDataAdapter Dim DS_Prodotti As New Data.DataSet Dim qry_Prodotti = "SELECT sistemaf.prodscadenze.Ministeriale, sistemaf.prodscadenze.Lotto, sistemaf.prodscadenze.Scadenza " & _ "FROM sistemaf.Prodscadenze " 'INNER JOIN sistemaf.Prodscadenze ON sistemaf.prodbase.Cod39 = sistemaf.prodscadenze.Ministeriale ;" command = New SqlCommand(qry_Prodotti, CnSql) dadapter.SelectCommand = command dadapter.Fill(DS_Prodotti) DG_Prodotti.DataSource = DS_Prodotti.Tables(0) 'DG_Prodotti.Columns("Descrizione").Width = 220 'DG_Prodotti.Columns("Ministeriale").Width = 60 DG_Prodotti.Columns("Lotto").Width = 60 'DG_Prodotti.Columns("Descrizione").AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells 'DG_Prodotti.Columns("Totale").DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight Catch ex As Exception MessageBox.Show(ex.Message) End Try End Sub End Class I can open the data only with Microsoft Excel now. Have any suggestions?

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  • implement button click in html

    - by vbNewbie
    I have been trying to execute a button event in html page that displays additional content on the web page. I am getting a null reference error when using the getelementbyid and not sure how to change this. Here is the html reference I need to engage: <div class="button" style="float:none;width:180px;margin:20px auto 30px;"><a href="#" id="more" style="width:178px">Show more ?</a></div> </div> and here is my code: Dim wb As New WebBrowser wb.Navigate(fromUrl) While wb.ReadyState <> WebBrowserReadyState.Complete Application.DoEvents() End While Debug.Write(wb.DocumentText) Dim htmlElements As HtmlElementCollection = wb.Document.GetElementsByTagName("<a") If Not wb.Document Is Nothing Then Try If wb.DocumentText.Contains("more") Then If wb.Document.GetElementById("more").GetAttribute("href") Then wb.Document.GetElementById("more").InvokeMember("#") End If End If Catch ex As Exception MessageBox.Show(ex.Message.ToString) End Try End If I appreciate any ideas.

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  • What's the standard way to organize the contents of Java packages -- specifically the location of in

    - by RenderIn
    I suppose this could go for many OO languages. I'm building my domain objects and am not sure where the best place is for the interfaces & abstract classes. If I have a pets package with various implementations of the APet abstract class: should it live side-by-side with them or in the parent package? How about interfaces? It seems like they almost have to live above the implementations in the parent package, since there could potentially be other subpackages which implement it, while there seems to be a stronger correlation between one abstract class and a subpackage. e.g. com.foo com.foo.IConsumer (interface) com.foo.APet (abstract) com.foo.pets.Dog extends APet implements IConsumer OR com.foo com.foo.IConsumer (interface) com.foo.pets.APet (abstract) com.foo.pets.Dog extends APet implements IConsumer or something else?

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  • How do I set my development web browser in VS2010 RC?

    - by blesh
    I don't like to use IE for my system default web browser. but I do want to set IE as my browser in VS2010 because it works a little nicer for debugging and I like to develop to the lowest common denominator. (jab, lol)... anyhow, can I default to debugging against IE? I know in VS2008 you just had to "Browse With..." on an .aspx page. But that option doesn't exist in VS2010 RC. What gives?

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  • In VisualStudio 2008, emacs mode - how can you enable "overwrite"?

    - by Abby Fichtner
    Using VisualStudio 2008, have emacs keyboard mapping scheme enabled. If I select text and try to paste over it, it INSERTS the new text, rather than replacing it. Also, if I select text and hit DELETE it deletes the first character AFTER the selected text (just as if I didn't have any text selected). Does anyone know how to fix this so that I get the standard windows behavior. That is: If I select text and try to paste over it, it replaces the selected text with what I pasted in. If I select text and hit the DELETE key, it actually deletes the text I have selected Thanks! Abby

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  • Am I abusing Policies?

    - by pmr
    I find myself using policies a lot in my code and usually I'm very happy with that. But from time to time I find myself confronted with using that pattern in situations where the Policies are selected and runtime and I have developed habbits to work around such situations. Usually I start with something like that: class DrawArrays { protected: void sendDraw() const; }; class DrawElements { protected: void sendDraw() const; }; template<class Policy> class Vertices : public Policy { using Policy::sendDraw(); public: void render() const; }; When the policy is picked at runtime I have different choices of working around the situation. Different code paths: if(drawElements) { Vertices<DrawElements> vertices; } else { Vertices<DrawArrays> vertices; } Inheritance and virtual calls: class PureVertices { public: void render()=0; }; template<class Policy> class Vertices : public PureVertices, public Policy { //.. }; Both solutions feel wrong to me. The first creates an umaintainable mess and the second introduces the overhead of virtual calls that I tried to avoid by using policies in the first place. Am I missing the proper solutions or do I use the wrong pattern to solve the problem?

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  • Some questions regarding Flex

    - by Rachel
    For what real time scenarios/use cases one should go to Flex Technology ? What real time problems you have solved using Flex Technology ? What real time problems have you faced because of using Flex Technology and what was your work around for that use case ?

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  • SSIS - Multiple Configurations

    - by Mick Walker
    I have inherited a SSIS project. I have never worked with SSIS before, and the one thing that seems strange to me, is that there is no way to manage multiple configurations. For each SSIS package we have 3 delpoyment environments, DEV, UAT and PRODUCTION. At the moment I am having to edit the configuration for every package we deploy manually for each change (and there are a lot of packages). Does anyone know of a more graceful way to handle these configuration changes?

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  • vsts load testing wcf app

    - by ashish.s
    I have a simple test written like this public class Test { [ThreadStatic] private static ServiceClient client; [TestMethod] public void TestCase1() { If( client == null) { .... //instantiate client } client.CallMyServiceMethod() } [TestMethod] public void TestCase2() { using(var newClient = new ServiceClient()) { newClient.CallMyServiceMethod() } } The percentage of new users is set to 100 % for the test, and the user load is constant load of 1. But the response time for TestCase1 is about 3 times better than TestCase2. Can someone see what i am missing here ? many thanks

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  • Are these jobs for developer or designers or for client itself?

    - by jitendra
    Spell checking grammar checking Descriptive alt text for big chart , graph images, technical images To write Table summary and caption Descriptive Link text Color Contrast checking Deciding in content what should be H2 ,H3, H4... and what should be <strong> or <span class="boldtext"> Meta Description and keywords for each pages Image compression To decide Filenames for images,PDf etc To decide Page's <title> for each page

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  • Natural vs surrogate keys on support tables

    - by Bugeo
    I have read many articles about the battle between natural versus surrogate primary keys. I agree in the use of surrogate keys to identify records of tables whose contents are created by the user. But in the case of supporting tables what should I use? For example, in a hypothetical table "orderStates". If you use a natural key would have the following data: TABLE ORDERSTATES {ID: "NEW", NAME: "New"} {ID: "MANAGEMENT" NAME: "Management"} {ID: "SHIPPED" NAME: "Shipped"} If I use a surrogate key would have the following data: TABLE ORDERSTATES {ID: 1 CODE: "NEW", NAME: "New"} {ID: 2 CODE: "MANAGEMENT" NAME: "Management"} {ID: 3 CODE: "SHIPPED" NAME: "Shipped"} Now let's take an example: a user enters a new order. In the case in which use natural keys, in the code I can write this: newOrder.StateOrderId = "NEW"; With the surrogate keys instead every time I have an additional step. stateOrderId_NEW = .... I retrieve the id corresponding to the recod code "NEW" newOrder.StateOrderId = stateOrderId_NEW; The same will happen every time I have to move the order in a new status. So, in this case, what are the reason to chose one key type vs the other one?

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  • Automatic login into asp.net site from flash movie

    - by IrfanRaza
    Hello friends, I have a landing page designed as a flash movie. Please visit http://ivautoinc.com. The movie contains login button. For now when you click on this button I am redirecting to asp.net site login page. What I need is if you click on login button, the login form which is designed within flash will be shown on the same movie. The users will provide username and password. As soon as they press OK button they should see the page from my asp.net site as it is displayed after loggin in. Can anybody help me? Thanks for sharing your valuable time.

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  • F10 isn't working properly in VS2005

    - by torvin
    When project is stopped (not in the debugging state) and you press F10, normally the debugging session starts and VS stops at the entry point (e.g. Program.Main). That always worked for me in VS2005 and works OK in VS2008. But recently that stopped working in my VS2005 - the project just runs as if I pressed F5, so I have to place a breakpoint at Program.Main when I need to stop at the entry point. Though it continues to work as it should in my VS2008. I suspect, that's because I installed Reflector add-in and it changed some settings in VS2005, but I just can't find out which settings. Also, disabling that add-in has no effect on my issue :-( Please help, thanks in advance.

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