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Articles indexed Monday March 8 2010

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  • Query only the first detail record for each master record

    - by Neal S.
    If I have the following master-detail relationship: owner_tbl auto_tbl --------- -------- owner --- owner auto year And I have the following table data: owner_tbl auto_tbl --------- -------- john john, corvette, 1968 john, prius, 2008 james james, f-150, 2004 james, cadillac, 2002 james, accord, 2009 jeff jeff, tesla, 2010 jeff, hyundai, 1996 Now, I want to perform a query that returns the following result: john, corvette, 1968 jeff, hyundai, 1996 james, cadillac, 2002 The query should join the two tables, and sort all the records on the "year" field, but only return the first detail record for each master record. I know how to join the tables and sort on the "year" field, but it's not clear how (or if) I might be able to only retrieve the first joined record for each owner. Three related questions: Can I perform this kind of query using LINQ-to-SQL? Can I perform the query using T-SQL? Would it be best to just create a stored procedure for the query given its likely complexity?

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  • In python, what does len(list) do?

    - by nsharish
    My doubt is that if the len(list) calculates the length of the list everytime it is called or it returns the value of the builtin counter.I have a context where i need to check the length of list everytime in a loop, likelistData = [] for value in ioread(): if len(listData)=25: processlistdata() clearlistdata() listData.append(value) Should I check len(listData) every iteration, or can I have a counter for the length of the list.

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  • Problem in SQL Server 2005

    - by megala
    I Know how to create table in SQL server 2005.But due to system problem i reinstalled SQL SErver 2005.After that I select the option like that start - programs - microsoft sql server 2005 - sql server management studio express My problem is in that sql server management studio express is not exits.How to solve the above problem Thanks in advance

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  • real time plotting on iPhone using core plot?

    - by ram007
    I want to use core-plot for drawing line graph dynamically. data won't come at a time, we will be receiving point by point dynamically. Is it possible to draw the chart dynamically using core-plot i.e drawing point by point as on when we receive the (x,y) point? Please help me, Thanks.

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  • Is git suitable for one developer without server

    - by Shawn Mclean
    I am a single developer without another computer to backup my projects on. I'm looking into source controls and I came across git but all the setup tutorials are targeted to an external server. I used to use SourceGear Vault, but seeing that git is getting alot of attention, I might as well familiarize myself with it. I do not always have internet access. Is Git suitable for me? Can I be pointed in the right direction to set it up? Visual Studio 2008. Windows 7.

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  • A really smart rails helper needed

    - by Stefan Liebenberg
    In my rails application I have a helper function: def render_page( permalink ) page = Page.find_by_permalink( permalink ) content_tag( :h3, page.title ) + inline_render( page.body ) end If I called the page "home" with: <%= render_page :home %> and "home" page's body was: <h1>Home<h1/> bla bla <%= render_page :about %> <%= render_page :contact %> I would get "home" page, with "about" and "contact", it's nice and simple... right up to where someone goes and changes the "home" page's content to: <h1>Home<h1/> bla bla <%= render_page :home %> <%= render_page :about %> <%= render_page :contact %> which will result in a infinite loop ( a segment fault on webrick )... How would I change the helper function to something that won't fall into this trap? My first attempt was along the lines of: @@list = [] def render_page( permalink ) unless @@list.include?(permalink) @@list += [ permalink ] page = Page.find_by_permalink result = content_tag( :h3, page.title ) + inline_render( page.body ) @@list -= [ permalink ] return result else content_tag :b, "this page is already being rendered" end end which worked on my development environment, but bombed out in production... any suggestions? Thank You Stefan

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  • php- javascript

    - by arafat
    i got a sales web site each time i press "sales" button it it will open a new frame. there is a possibility for more then one frame at the same time. my problem is i want to close the frame after i click enter and home page to be updated provided all the other pending sales frames are remain open.... i tried to do so with window concept also no use so any body can geve a solution regards

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  • Can I use PayPal to charge a Credit Card automatically?

    - by Mark
    If I have a Visa card number saved in my database, is there a way I can charge that Visa automatically through the PayPal API without the user having to enter anything? We want to keep this site as easy and hassle-free to use as possible. It would be a variable amount, based on how they use the site. (Don't worry, proper disclaimers will be in place, and the user will be notified) What about these "recurring payments"? That way I don't have to store the CC info on my website, but do they allow variable amounts that I could periodically send to PayPal?

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  • Setting the primary key of a object type table in Oracle

    - by Rek
    I have two Oracle questions. How can I set the primary key of a table when the table is made up of an object type? e.g. CREATE TABLE object_names OF object_type I have created a Varray type, CREATE TYPE MULTI_TAG AS VARRAY(10) OF VARCHAR(10); but when I try to do SELECT p.tags.count FROM pg_photos p; I get an invalid identifier error on the "count" part. p.tags is a MULTI_TAG, how can I get the number of elements in the MULTI_TAG?

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  • Weird Mono compilation error

    - by nubela
    Hi, I am using IKVM to get SVNKit on a Mono project I'm working with, I have a class that implements an interface from SVNKit, and I can't compile: On windows and on .NET, everything compiles fine, just getting this on Mono. /home/nubela/Workspace/subsync/subsync/Core/Subversion/PropGetHandler.cs(22,22): Error CS0535: Subsync.Core.Subversion.PropGetHandler' does not implement interface member org.tmatesoft.svn.core.wc.ISVNPropertyHandler.__()' (CS0535) (subsync) I googled _() method, and it seems to be the initializer method for the base class in the Java library compiled from IKVM. I have no clue how to proceed now, any idea guys? :)

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  • Credit card system implementation?

    - by Mark
    My site is going to have a credit system that basically works a lot like a credit card. Each user has an unlimited credit limit, but at the end of each week, they have to pay it off. For example, a user might make several purchases between March 1st and 7th, and then at the end of March 7th, they would be emailed an invoice that lists all their purchases during the week and a total that is due by the 14th. If they don't pay it off, their account is simply deactivated until they do. I'm just trying to wrap my head around how to implement this. I have a list of all their purchases, that's not a problem, but I'm just trying to figure out what to do with it. On the end of the 7th day, I could set up a cronjob to generate an invoice, which would basically have an id, and due date, and then I would need another many-to-many table to link all the purchases to the invoice. Then when a user adds money to their account, I guess it's applied against their current outstanding invoice? And what if they don't pay off their invoice by the time a new invoice rolls around, so now they have 2 outstanding ones, how do I know which to apply it against? Or do I make the cronjob check for any previous outstanding invoices, cancel them, and add a new item to the new invoice as "balance forward (+interest)"? How would you apply the money against an invoice? Would each payment have to be linked to an invoice, or could I just deposit it to their account credit, and then somehow figure out whats been paid and what hasn't? What if they pay in advance, before their invoice has been generated? Do I deduct it from their credit from the invoice upon generation, or at the end of the week when its due? There are so many ways to do this... Can anyone describe what approach they would take?

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  • How to scan the wireless devices which exist on the network

    - by amexn
    Now my team working in a network project using windows application c#. How to scan the wireless devices which exist on the network.The functionality is exactly the same thing that you see in the existing windows utilities within the windows operating system. I'm sure you experienced when you plug a wireless laptop card in, it brings up a window that shows you all of the access points it detects for connecting to. How to capture this information listed below MAC Address IP Address SSID Channel Timestamp Cipher type Encryption level Signal Strength Did i use Kismet or NetStumbler. Please suggest good library/code

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  • Tips for improving performance of DB that is above size 40 GB (Sql Server 2005) and growing monthly

    - by HotTester
    The current DB or our project has crossed over 40 GB this month and on an average it is growing monthly by around 3 GB. Now all the tables are best normalized and proper indexing has been used. But still as the size is growing it is taking more time to fire even basic queries like 'select count(1) from table'. So can u share some more points that will help in this front. Database is Sql Server 2005. Further if we implement Partitioning wouldn't it create a overhead ? Thanks in advance.

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  • Identifying and removing null characters in UNIX

    - by fahdshariff
    I have a text file containing unwanted null characters. When I try to view it in I see ^@ symbols, interleaved in normal text. How can I: a) Identify which lines in the file contains null characters? I have tried grepping for \0 and \x0, but this did not work. b) Remove the null characters? Running strings on the file cleaned it up, but I'm just wondering if this is the best way? Thanks

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  • WCF hosted in a Web application and compatibility mode

    - by DotnetDude
    I have a WCF service hosted in a web application (IIS). I need to expose 1 end point over wsHttp and the other over netTcp. I am on a IIS7 environment that makes it possible for me to host non HTTP based services. Anyways, when I browse the .svc file using a browser, I get the error: The service cannot be activated because it does not support ASP.NET compatibility. ASP.NET compatibility is enabled for this application By googling, I realized that WCF runs in two modes - Mixed and ASP.NET compatible. When I apply the attribute [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] However, it appears that once I apply this attribute to the Service Contract implementation, I cannot use a non HTTP binding. How do I set it up so that: I can support non HTTP endpoints I can host the service on a Web app I don't create multiple services one with aspnet compatibility turned on and the other turned off

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  • How to check if an apply-template filled variable is a string or (possibly) empty node in XSLT?

    - by calavera.info
    I need a test which would evaluate to true in two cases: There is a string inside which contains any non white space characters There is any node (which can be possibly empty) on a variable that is filled with apply-template call result. I tried test="normalize-space($var)" but this doesn't cover the empty tag possibility. I also tried simply this: test="$var" but this evaluate to true even for white space only strings. By the way "$var/*" produces an error "Expression ...something I don't remember... node-set" which is I think because of apply-template variable instantiation. Is there any (which means even multi level decision) solution for this? EDIT: I forgot to say that it's for XSLT 1.0 and preferably without any exslt extensions or similar.

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  • default gateway and tracert

    - by chappar
    when i do "route print" on my machine, it shows my default gateway as 10.225.150.1 but when i do tracert www.google.com, the first machine it reaches is 10.225.150.2. The route command does not show any entry for 10.225.150.2. So, why tracert is showing 10.225.150.2? my maching is on Windows XP.

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  • OpenVPN Cloud for Network monitoring

    - by mezgani
    I'm working on a supervision project based on OpenVPN, a good way to send some network traffic through a secure channel to office from there out to the Internet. On office i have an OpenVPN server installed and i need to monitor all branches servers that are behind firewalls. I know that the point to point solution is very easy so we may only install OpenVPN client on node that i need to monitor. In the fact, is there any other issue that could help to supervise all branches DMZ network, without installing the client on each machines.

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  • Script to wrap around an application and wait for app to finish

    - by JohnyV
    I need a vb script that will wrap around an applcation which will stay open until the application finishes. I want to be able to call the following command "setup.exe /qb /I Autocad2010.ini /language en-us" But I need the vb script to stay running until the setup has finished. Is there anyone out there that can assist with this. Much appreciated in advance

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  • Setting reply priority on Wifi network with QoS?

    - by Omega
    When using a Station and Access Point that support QoS over Wifi, is it possible to set the priority (= Traffic Identifier = TID = QoS channel) of the reply? For example when sending a ICMP ping request using a high priority (= QoS channel), is it possible to force the station to use that same priority (= QoS channel) when sending the reply? A related question: Is it possible to force the station into using a different QoS channel?

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  • Java 5 to Java 1.4 Source Code Backporting Tool

    - by kolrie
    Is there a tool that, given a Java 5 level source code, will backport it to Java 1.4-compliant source code, by removing Generics declarations, transforming for eachs in simple fors or iteration fors, etc.? Please note that I am looking for a tool that translates source code to source code, not class binaries.

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