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Articles indexed Wednesday June 9 2010

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  • Run SQL Queries on DataTables, or similar, in .Net, without an RDBMS

    - by FastAl
    I'd like to have a dataset or datatables, and be able to run SQL statements on them, without using any external RDBMS. For Example, to take take 2 datatables in a dataset and just join them outright with a SQL statement and Where clause, the result being a new datatable? For example if I have 2 datatables, named People and Addresses in a dataset (that I built using code, not getting from a database .. pardon the old fashioned Join syntax): dim dtJoined as DataTable = MyDataSet.RunSQLQuery ("Select * from People, Orders Where People.PersonID=Orders.OrdereID") Thanks

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  • How to filter rows on a complex filter

    - by dan
    I have these rows in a table ID Name Price Delivery == ==== ===== ======== 1 apple 1 1 2 apple 3 2 3 apple 6 3 4 apple 9 4 5 orange 4 6 6 orange 5 7 I want to have the price at the third delivery (Delivery=3) or the last price if there's no third delivery. It would give me this : ID Name Price Delivery == ==== ===== ======== 3 apple 6 3 6 orange 5 7 I don't necessary want a full solution but an idea of what to look for would be greatly appreciated.

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  • Creating an object in the loop

    - by Jacob
    std::vector<double> C(4); for(int i = 0; i < 1000;++i) for(int j = 0; j < 2000; ++j) { C[0] = 1.0; C[1] = 1.0; C[2] = 1.0; C[3] = 1.0; } is much faster than for(int i = 0; i < 1000;++i) for(int j = 0; j < 2000; ++j) { std::vector<double> C(4); C[0] = 1.0; C[1] = 1.0; C[2] = 1.0; C[3] = 1.0; } I realize this happens because std::vector is repeatedly being created and instantiated in the loop, but I was under the impression this would be optimized away. Is it completely wrong to keep variables local in a loop whenever possible? I was under the (perhaps false) impression that this would provide optimization opportunities for the compiler. EDIT: I use VC++2005 (release mode) with full optimization (/Ox)

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  • What does a static modifier on a constructor means?

    - by the_drow
    I saw this kind of code at work: class FooPlugin : IPlugin // IPlugin is a Microsoft CRM component, it has something special about it's execution { static FooPlugin() { SomeObject.StaticFunction(); // The guy who wrote it said it's meaningful to this question but he can't remember why. } } Any idea what does a static modifier on a constructor mean and why in this case it is required?

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  • MySql Driver not loaded

    - by ayla
    I use Visual Studio 2008, MySQL 5.0.90,Qt 4.6.3 and C++ I try connect MySql but it gives this error messages. Driver not loaded. I am new programmer. How cann I solve this problem? Thank a lot.

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  • What's the best way to implement one-dimensional collision detection?

    - by cyclotis04
    I'm writing a piece of simulation software, and need an efficient way to test for collisions along a line. The simulation is of a train crossing several switches on a track. When a wheel comes within N inches of the switch, the switch turns on, then turns off when the wheel leaves. Since all wheels are the same size, and all switches are the same size, I can represent them as a single coordinate X along the track. Switch distances and wheel distances don't change in relation to each other, once set. This is a fairly trivial problem when done through brute force by placing the X coordinates in lists, and traversing them, but I need a way to do so efficiently, because it needs to be extremely accurate, even when the train is moving at high speeds. There's a ton of tutorials on 2D collision detection, but I'm not sure the best way to go about this unique 1D scenario.

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  • How to use a control like the one in Visual Studio's Class Details window

    - by Chapso
    There is a control in Visual Studio's Class Details window (accessed via Class Diagram) which combines a ListView with a TreeView. The result looks something like this: TreeViewNode1 Column 1 Column 2 Column 3 Column 1 Column 2 Column 3 TreeViewNode2 Column 1 Column 2 Column 3 Column 1 Column 2 Column 3 All of the TreeView Nodes are collapsable so that you can view only the nodes you want to. I am looking to implement this, but it doesn't seem to be a .net control. Does anyone know of a control which already exists that allows this? It has to be free (as in beer).

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  • In silverlight how do you scrub a string

    - by jvcoach23
    I have a string that looks like this " Into" and I can't figure out what the " " value is just before the Into. It's not a space, it's not an enter. At least i don't think so. I've tried doing a replace to get rid of it.. So now i'm just trying to figure out what that character value is. Convert.int32 doesn't get it done... What can i use to get rid of that character... I guess i could write a function that would loop through the alphabet and do it that way.. but figured there was a better way. thanks shannon

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  • TCP 3 way handshake

    - by Tom
    Hi, i'm just observing what NMAP is doing for the 3 ports it reports are open. I understand what a half-scan attack is, but what's happening doesnt make sense. NMAP is reporting ports 139 are 445 are open..... all fine. But when i look at the control bits, NMAP never sends RST once it has found out the port is open, It does this for port 135- but not 139 and 445. This is what happens: (I HAVE OMITTED THE victim's replies) Sends a 2 (SYN) Sends a 16 (ACK) Sends a 24 (ACK + PST) Sends a 16 (ACK) Sends a 17 (ACK + FIN) I dont get why NMAP doesnt 'RST' ports 139 and 445??

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  • How can I separate error_messages from two forms on one page?

    - by itkevin
    I have two forms in one view updating the User Profile. One Form is to Update my name etc. and one is to change my password. Profile Form: - form_for @user, :url => account_path do |f| = f.error_messages ...form fields here... Password Form: - form_for @user, :url => account_path do |pf| = pf.error_messages ...password fields here... As you can see they both point to the same update action in the users controller. If I type in a invalid password both error_messages show me the same error message. How can I output separate error messages per form?

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  • How change Castor mapping to remove "xmlns:xsi" and "xsi:type" attributes from element in XML output

    - by Derek Mahar
    How do I change the Castor mapping <?xml version="1.0"?> <!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN" "http://castor.org/mapping.dtd"> <mapping> <class name="java.util.ArrayList" auto-complete="true"> <map-to xml="ArrayList" /> </class> <class name="com.db.spgit.abstrack.ws.response.UserResponse"> <map-to xml="UserResponse" /> <field name="id" type="java.lang.String"> <bind-xml name="id" node="element" /> </field> <field name="deleted" type="boolean"> <bind-xml name="deleted" node="element" /> </field> <field name="name" type="java.lang.String"> <bind-xml name="name" node="element" /> </field> <field name="typeId" type="java.lang.Integer"> <bind-xml name="typeId" node="element" /> </field> <field name="regionId" type="java.lang.Integer"> <bind-xml name="regionId" node="element" /> </field> <field name="regionName" type="java.lang.String"> <bind-xml name="regionName" node="element" /> </field> </class> </mapping> to suppress the xmlns:xsi and xsi:type attributes in the element of the XML output? For example, instead of the output XML <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="UserResponse"> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> I'd prefer <?xml version="1.0" encoding="UTF-8"?> <ArrayList> <UserResponse> <name>Tester</name> <typeId>1</typeId> <regionId>2</regionId> <regionName>US</regionName> </UserResponse> </ArrayList> such that the element name implies the xsi:type.

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  • Execute python code inside browser without Jython

    - by proportional
    Is there a way to execute python code in a browser, other than using Jython and an applet? The execution does not have to deal with anything related to graphics. For example, just sum all the digits of a binary 1Gb file (chosen by the browser user) and then return the result to the server. I am aware that python can be executed remotely outside a browser, but my requirement is to be done inside a browser. For sure, I take for granted the user will keep the right to execute or not, and will be asked to do so, and all this security stuff... but that is not my question.

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  • iPhone SDK 3/4 App will not run on a iPhone 2.x device even with deployment target set to 2.0!

    - by MarqueIV
    Ok... I know about the difference between the base/active SDKs and the deployment target. I have my base SDK set at 4.0 and the deployment target set at 2.0. I am not using any APIs post 2.x, conditional or otherwise. Since I can't debug on a 2.x device, after building it, I use the iPhone Configuration Utility to install the app on the device, which it does just fine. Problem is, it doesn't run! I just get a blank screen. The main window never comes up! Now before you ask... I had this same problem with the iPhone SDK 3.x. I upgraded to the 4.x hoping it would be solved. It wasn't. Yes the provisioning profile is installed. (Couldn't install the app if it wasn't.) This same compiled app works fine on 3.x devices. Same with 4.x devices. Just not 2.x devices. Again, no I am not using any post-2.x SDKs. To prove this I created a brand-new, window-based app from the 'New Project' dialog and the only changes I made was the background color of the window (to prove the XIB loaded) and I set the deployment target to 2.0 (It's still compiled against the 4.x SDK though.) Again, it runs fine on 3.x or 4.x devices, but just a black, blank screen on 2.x devices. I've tried this on three separate 2.x devices included one freshly restored. I've used three separate dev machines (MacBook Pro with the 3.x SDK, MacBook Pro with the 4.x SDK and a Mac Pro with the 3.x SDK.) Same result every time. I am stumped. The fact that even an unmodified project doesn't run really has me confused. Could it be the XIB file? Did they change the format from 2.x to something newer in the 3.x SDK? If so, how do I set it back to 2.x. (Again, this is just a complete guess.) But I'm really stumped! Mark

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  • Sharepoint Web performance optimization

    - by hertzel
    We are running on SSL on following server topology: 1 ISA (SSL Terminate/cache/proxy+AD authentication) 1 Sharepoint 1 IBM DB2 Database as enterprise/corporate DB 1 MS SQL Server as local DB We have recently optimized the caching, compression, minification, and other ASP.net best practices such as viewstate and cookie sizes, minimizing round trips, parallel connections/domain sharding and a lot more.... Now we are not convinced that the we are in an optimized position as the network resources i.e. bandwidth and especially latency are out of our control!! The client/browser to server/sharepoint is trans-Atlantic i.e. (ASIA, USA, EUROPE). As of my understanding the only ways to improve the network (latency) are: - TCP/SSL optimization - hardware/software? - CDNs - cloud or our own ? Your opinion and insights would be much appreciated Best regards Hertzel

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  • Using embedded standard HTML forms with ASP.NET

    - by RM
    I have a standard aspx page with which I need to add another standard HTML form into and have it submit to another location (external site), however whenever I press the submit button the page seems to do a post back rather than using the sub-forms action url. A mock up of what the form relationships is below. Note in the real deployment the form will be part of a content area of a master page layout, so the form needs to submit independantly from the master page form. <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <form id="subscribe_form" method="post" action="https://someothersite.com" name="em_subscribe_form" > <input type="text" id="field1" name="field1" /> <input id="submitsubform" type="submit" value="Submit" /> </form> </div> </form> </body> </html>

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  • ToC for the Book Club RIA Services Application

    Earlier this week, I published the RIA Services Essentials project on CodePlex to share some sample code. The first sample included is an updated version of the Book Club application. This application has become sort of a reference application. It was written to demonstrate some aspects of writing a semi-real-worldish application (note that it is still very much a demo app), but more importantly, demonstrating how you can use RIA Services effectively by going beyond the basics. As such, it isn't...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Using Java, can I have one JVM spawn another, and then have the original one exit?

    - by CarlG
    I have a need to have a running JVM start another JVM and then exit. I'm currently trying to do this via Runtime.getRuntime().exec(). The other JVM starts, but my original JVM won't exit until the "child" JVM process stops. It appears that using Runtime.getRuntime().exec() creates a parent-child relationship between the processes. Is there some way to de-couple the spawned process so that the parent can die, or some other mechanism to spawn a process without any relationship to the creating process? Note that this seems exactly like this question: http://stackoverflow.com/questions/2566502/using-java-to-spawn-a-process-and-keep-it-running-after-parent-quits but the accepted answer there doesn't actually work, at least not on my system (Windows 7, Java 5 and 6). It seems that maybe this is a platform-dependent behavior. I'm looking for a platform independent way to reliably invoke the other process and let my original process die.

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  • jQuery Dynamic Button Click Handler

    - by Neb
    I have a code the change the html of a div to make a button. When I make a click handler for the dynamic button, nothing happens $('#signinup').html("<button id=\"login_submit\">Sign In</button>"); And the handler: $('#login_submit').click(function() { alert("Works!"); });

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  • Generating text file from database

    - by Goldmember
    I have a requirement to hand-code an text file from data residing in a SQL table. Just wondering if there are any best practices here. Should I write it as an XMLDocument first and transform using XSL or just use Streamwriter and skip transformation altogether? The generated text file will be in EDIFACT format, so layout is very specific.

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