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  • C# and MySQL .NET Connector - Any way of preventing SQL Injection attacks in a generic class?

    - by John M
    My idea is to create some generic classes for Insert/Update/Select via a C# (3.5) Winforms app talking with a MySQL database via MySQL .NET Connector 6.2.2. For example: public void Insert(string strSQL) { if (this.OpenConnection() == true) { MySqlCommand cmd = new MySqlCommand(strSQL, connection); cmd.ExecuteNonQuery(); this.CloseConnection(); } } Then from anywhere in the program I can run a query with/without user input by just passing a SQL query string. Reading around on SO is starting to give me the indication that this may lead to SQL injection attacks (for any user-input values). Is there anyway of scrubbing the inputted strSQL or do I need to go and create individual parameterized queries in every method that needs to do a database function?

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  • What is a NullReferenceException in .NET?

    - by John Saunders
    (I'm creating this separate question and answer because every question we get on NullReferenceException is really the same) I have some code and when it executes, it throws a NullReferenceException, saying, "Object reference not set to an instance of an object.". What does this mean, and what can I do about it? Note again, that this is a question meant to focus answers to the canonical "what is a NullReferenceException and why did I get one" question. I do know what a NullReferenceException is, as my answer below demonstrates.

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  • Separate Database for Integration Testing

    - by john doe
    I am performance integration testing where I fire up the ASPX pages using WatiN and fill the fields and insert into the database. There are couple of problems that I am facing. 1) Should I use a completely separate database for integration testing? I already gave db_test and db_dev. db_test is for unit testing and is cleared after each test. db_dev is for developers. 2) When I run WatiN test which are contained in a separate assembly (not separate from unit test assembly which should be better since WatiN test take so much time to run). So WatiN test fire up the WebApps project and uses their web.config which is pointing to the dev database. Is there anyway I can tell WatiN to use a separate web.config which contains a different database name?

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  • C# Reflection StackTrace get value

    - by John
    I'm making pretty heavy use of reflection in my current project to greatly simplify communication between my controllers and the wcf services. What I want to do now is to obtain a value from the Session within an object that has no direct access to HttpSessionStateBase (IE: Not a controller). For example, a ViewModel. I could pass it in or pass a reference to it etc. but that is not optimal in my situation. Since everything comes from a Controller at some point in my scenario I can do the following to walk the sack to the controller where the call originated, pretty simple stuff: var trace = new System.Diagnostics.StackTrace(); foreach (var frame in trace.GetFrames()) { var type = frame.GetMethod().DeclaringType; var prop = type.GetProperty("Session"); if(prop != null) { // not sure about this part... var value = prop.GetValue(type, null); break; } } The trouble here is that I can't seem to work out how to get the "instance" of the controller or the Session property so that I can read from it.

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  • How to embed iPhone-Wax into app

    - by John Smith
    Hello I have just learnt about iPhone-Wax (thanks to SO). Now the documentation is rather sparse for what I am trying to do. I want to embed it into an Objective-C app. I don't want it to be the main app. Has anyone done it and how can I achieve it?

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  • Python turtle module confusion

    - by John
    Hi, I'm trying to to add more lines to the triangle, so instead of 3 leading off there will be 5 depending on the parameter given but I really have no idea what to do at this stage and any help would be very welcome. Thanks in advance!:) def draw_sierpinski_triangle(tracer_on, colour, initial_modulus, line_width, initial_heading,initial_x, initial_y, steps): turtle=Turtle() turtle.name = 'Mother of all turtles' turtle.reset () turtle.tracer (tracer_on) turtle.speed ('fastest') turtle.color (colour) turtle.width (line_width) turtle.up() turtle.goto (initial_x, initial_y) turtle.down() turtle.set_heading (initial_heading) draw_sub_pattern (tracer_on, turtle, initial_modulus, 0, steps) def draw_sub_pattern (tracer_on, turtle, modulus, depth, steps): if (depth >= steps): return; x, y = turtle.position () heading = turtle.heading () # draw the pattern turtle.up() turtle.down() turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 120) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 240) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps)

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  • How to setup split test?

    - by John Isaacks
    I want to create a way to test different layouts on a page to see which get more conversions. For example. If I have 2 versions of a page and I send 50% to page A and 50% to page B and see which one converts more sales. So I am thinking maybe use .htaccess to rewrite half to page A and the other half to page B. But how can I do that with .htaccess is there a way? do I need to use PHP instead to do this? Also if there is a better way to do this, or any cautions I should be aware of, please let me know.

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  • call a custom event from an item renderer in flex 4

    - by john
    I have a Renderer: [Event(name="addToCart",type="event.ProductEvent")] import mx.collections.ArrayCollection; protected function button1_clickHandler(event:MouseEvent):void { var eventObj:ProductEvent=new ProductEvent("addToCart",data.price,data.descript); dispatchEvent(eventObj); } ]]> <s:Label text="{data.descript}"/> <mx:Image source="{data.url}" width="50" height="50" width.hovered="100" height.hovered="100"/> <s:Label text="{data.price}"/> <s:Button includeIn="hovered" click="button1_clickHandler(event)" label="buy"/> and the custom event class: package events { import flash.events.Event; [Bindable] public class ProductEvent extends Event { public var price:String; public var descript:String; public function ProductEvent(type:String,price:String, descript:String) { super(type); this.price=price; this.descript=descript; } override public function clone():Event { return new ProductEvent(type,price,descript); } } } but a cannot call that event in : any ideas? thanks

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  • detect us military email address

    - by John
    Does anybody know which domains to search for (other than ".mil") to look for military addresses posting to a web form? Clarification: we're offering a discount to our customers, and we really only have time to cough up an email address regex which can fit into our existing system. This is on LAMP.

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  • WPF ListBox's scrollviewer customizable so that there is no Scrollbar, only RepeatButtons

    - by John
    Hi I would like to customize the scrollbars of a listbox's scrollviewer in such a way that the scrollbar only consists of a RepeatButton for scrolling up and a Repeatbutton for scrolling down. Nothing else. There should be no scrollbar (track) between the buttons. One button should be to the left of the ItemsPanel (scroll up) and the other on the right of the ItemsPanel. Is that possible?

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  • Problems with Silverlight and GeckoFX

    - by John
    Hello, I am trying to use GeckoFX to render Silverlight video, but it does not seem to be working. Does anyone have any idea why this would be? From my understanding it should work properly right out of the box. Thanks!

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  • Components for creating Archives

    - by John
    Hello, I'm searching for a simple,free component for creating archives with the capability of adding files to an already existing archive.Compressions is not a matter as much as performance so even "store" will be useful. Please help me find one.

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  • designing an API wrapper for Twitter, Facebook, Youtube etc...

    - by John Stewart
    I am looking at some pointers on how to design a wrapper for these social networking sites. Ideally what I want to do is create a black box where I am able to create an interface for other libraries to call certain functions to interact with these social networking sites. I am planning on using oAuth for most of these sites, I already have this layer designed in PHP. The other layer that I need for these social sites is the ability to push and pull content. For example, the ability to pull feeds for users from each of these networks and then should I cache them on my end? how would I cache all twitter, facebook etc activity feed and be able to account for resync etc? The networks that I am looking at are: Twitter Youtube Facebook LinkedIN Vimeo Flickr I am looking for ideas on how to tackle this in php? Any suggestions, opensource systems that I can learn from?

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  • PHP Shopping Cart Script - When to empty cart?

    - by john
    Im working on a shopping cart script in php and need some advice on how to handle the final process. Once the customer has entered items into the cart, chosen shipping option, and then clicked the checkout button, they are then redirected to a paypal button which is dynamically generated using BMCreateButton. My question is, when is the best time to empty the customers cart? I have set up the auto return feature on paypal, which i was goin to use to then empty the cart, but its not very good as customers have to click a link in order to redirect. So should i empty it when they click the checkout button just before the dynamic button? I can also use these setting in php to prevent cach back button issues // Date in the past header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Always modified header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // HTTP/1.1 header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); // HTTP/1.0 header("Pragma: no-cache"); What would to guys recommend? cheers.

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  • Java Applet not caching

    - by John Fogerty
    Hello world, I'm having a problem with a Java applet I've deployed that is refusing to be cached in the jvm's "sticky" cache (or by the browser). For some reason every time a user loads the page this applet is on, the jvm re-downloads the jar file from the server which causes a long delay. The webpage containing the applet is being accessed via the internet, so according to Sun's Java applet documentation I'm using an <applet> tag rather than an <object> or <embed> tag. Any help debugging or identifying the problem would be much appreciated. Below is the full applet tag I'm using: <applet alt="Scanning Applet failed to load" archive="scanning.jar" code="scanning.scanlet.class" codebase="/java/" codetype="application/java" height="30" mayscript="True" name="scanlet" width="200"> <param name="domain" value="192.168.12.23" /> <param name="publishName" value="scan_attachment" /> <param name="publishURL" value="http://192.168.12.23/draft/update/52" /> <param name="curURL" value="http://192.168.12.23/draft/edit/52" /> Your browser is unable to process the Java &lt;APPLET&gt; tag needed to display this applet <br /> One solution would be to download a better web browser like <a href="http://www.mozilla.com/firefox">Mozilla's Firefox</a> </applet>

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  • What is the best way to attach extenstion methods to static classes rather than to instances of a cl

    - by John Gietzen
    If I have a method for calculating the greatest common divisor of two integers as: public static int GCD(int a, int b) { return b == 0 ? a : GCD(b, a % b); } What would be the best way to attach that to the System.Math class? Here are the three ways I have come up with: public static int GCD(this int a, int b) { return b == 0 ? a : b.GCD(a % b); } // Lame... var gcd = a.GCD(b); and: public static class RationalMath { public static int GCD(int a, int b) { return b == 0 ? a : GCD(b, a % b); } } // Lame... var gcd = RationalMath.GCD(a, b); and: public static int GCD(this Type math, int a, int b) { return b == 0 ? a : typeof(Math).GCD(b, a % b); } // Neat? var gcd = typeof(Math).GCD(a, b); The desired syntax is Math.GCD since that is the standard for all mathematical functions. Any suggestions? What should I do to get the desired syntax?

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  • What is the best way to attach static methods to classes rather than to instances of a class?

    - by John Gietzen
    If I have a method for calculating the greatest common divisor of two integers as: public static int GCD(int a, int b) { return b == 0 ? a : GCD(b, a % b); } What would be the best way to attach that to the System.Math class? Here are the three ways I have come up with: public static int GCD(this int a, int b) { return b == 0 ? a : b.GCD(a % b); } // Lame... var gcd = a.GCD(b); and: public static class RationalMath { public static int GCD(int a, int b) { return b == 0 ? a : GCD(b, a % b); } } // Lame... var gcd = RationalMath.GCD(a, b); and: public static int GCD(this Type math, int a, int b) { return b == 0 ? a : typeof(Math).GCD(b, a % b); } // Neat? var gcd = typeof(Math).GCD(a, b); The desired syntax is Math.GCD since that is the standard for all mathematical functions. Any suggestions? What should I do to get the desired syntax?

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  • Casting a non-generic type to a generic one

    - by John Sheehan
    I've got this class: class Foo { public string Name { get; set; } } And this class class Foo<T> : Foo { public T Data { get; set; } } Here's what I want to do: public Foo<T> GetSome() { Foo foo = GetFoo(); Foo<T> foot = (Foo<T>)foo; foot.Data = GetData<T>(); return foot; } What's the easiest way to convert Foo to Foo<T>? I can't cast directly InvalidCastException) and I don't want to copy each property manually (in my actual use case, there's more than one property) if I don't have to. Is a user-defined type conversion the way to go?

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  • unresolved external symbol __penter referenced in function _WspiapiStrdup@4

    - by John Weldon
    I started getting this compile error after upgrading to Visual Studio 2010. Not sure if it's related, but I can't figure out what library to reference to satisfy this dependency? Is it just an API change bug or something? Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. del wstest.res wstest.obj wstest.pdb wstest.ilk wstest.exe wstest.exe.manifest vc90.pdb cl -Gh -Ox -DNDEBUG -c -DCRTAPI1=_cdecl -DCRTAPI2=_cdecl -nologo -GS -D_X86_=1 -DWIN32 -D_WIN32 -W3 -D_WINNT -D_WIN32_WINNT =0x0501 -DNTDDI_VERSION=0x05010000 -D_WIN32_IE=0x0600 -DWINVER=0x0501 -D_MT -D_DLL -MDd wstest.c wstest.c link /DEBUG /DEBUGTYPE:cv -out:wstest.exe wstest.obj Ws2_32.lib Shlwapi.lib Microsoft (R) Incremental Linker Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. wstest.obj : error LNK2019: unresolved external symbol __penter referenced in function _WspiapiStrdup@4 wstest.exe : fatal error LNK1120: 1 unresolved externals NMAKE : fatal error U1077: '"c:\program files (x86)\microsoft visual studio 10.0\vc\bin\link.EXE"' : return code '0x460' Stop.

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  • Resize matrix in latex beamer

    - by John Jiang
    Hi I was wondering how to resize matrices in a beamer environment. Currently I am writing the following code: \begin{align*} \left( \begin{array}{ccccccc} 0 & 1 & & & & & \\ -1 & 0 & & & & & \\ & & 0 & 1 & & & \\ & & -1 & 0 & & & \\ & & & & \ddots & & \\ & & & & & 0 & 1 \\ & & & & & -1 & 0 \end{array} \right) \end{align*} and the matrix takes up almost a whole page. I would like it to be about half a page in height.

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  • How to Create Element in XSLT When Copying Using Templates

    - by John Dumont
    Hello, I'm trying to create an element in an XML where the basic content is copied and modified. My XML is something like <root> <node> <child>value</child> <child2>value2</child2> </node> <node2>bla</node2> </root> The number of children of node may change as well as the children of root. The XSLT should copy the whole content, modify some values and add some new. The copying and modifying is no problem: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:output method="xml" encoding="UTF-8"/> <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> </xsl:stylesheet> (+ further templates for modifications). But how do I add a new element in this structure on some path, e.g. I want to add an element as the last element of the "node" node. The "node" element itself always exists.

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