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  • IQueryable and lazy loading

    - by Nelson
    I'm having a hard time determining the best way to handle this... With Entity Framework (and L2S), LINQ queries return IQueryable. I have read various opinions on whether the DAL/BLL should return IQueryable, IEnumerable or IList. Assuming we go with IList, then the query is run immediately and that control is not passed on to the next layer. This makes it easier to unit test, etc. You lose the ability to refine the query at higher levels, but you could simply create another method that allows you to refine the query and still return IList. And there are many more pros/cons. So far so good. Now comes Entity Framework and lazy loading. I am using POCO objects with proxies in .NET 4/VS 2010. In the presentation layer I do: foreach (Order order in bll.GetOrders()) { foreach (OrderLine orderLine in order.OrderLines) { // Do something } } In this case, GetOrders() returns IList so it executes immediately before returning to the PL. But in the next foreach, you have lazy loading which executes multiple SQL queries as it gets all the OrderLines. So basically, the PL is running SQL queries "on demand" in the wrong layer. Is there any sensible way to avoid this? I could turn lazy loading off, but then what's the point of having this "feature" that everyone was complaining EF1 didn't have? And I'll admit it is very useful in many scenarios. So I see several options: Somehow remove all associations in the entities and add methods to return them. This goes against the default EF behavior/code generation and makes it harder to do some composite (multiple entity) LINQ queries. It seems like a step backwards. I vote no. If we have lazy loading anyway which makes it hard to unit test, then go all the way and return IQueryable. You'll have more control farther up the layers. I still don't think this is a good option because IQueryable ties you to L2S, L2E, or your own full implementation of IQueryable. Lazy loading may run queries "on demand", but doesn't tie you to any specific interface. I vote no. Turn off lazy loading. You'll have to handle your associations manually. This could be with eager loading's .Include(). I vote yes in some specific cases. Keep IList and lazy loading. I vote yes in many cases, only due to the troubles with the others. Any other options or suggestions? I haven't found an option that really convinces me.

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  • Where do you keep your code?

    - by skiphoppy
    Your code is of course checked into a repository somewhere, but where do you keep your working copy/copies? C:\Program Files isn't right, as it's for installed packages. My Documents somehow doesn't seem right, either—a My Code folder next to My Music and My Pictures? Dumping in C:\ is messy, but seems to be "working" for other people in my office.

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  • Log4Net & RollingFileAppender to generate Xml files

    - by SaguiItay
    I've managed to configure Log4Net with a RollingFileAppender in order to generate Xml files. However, the generated files are not valid XML files until a "roll" is performed - the XML doesn't have a closing XML tag. Basically, this prevents to files from being read until that are "closed"/"rolled". Anyone else encountered this issue? I my previous (custom) solution I had to write the closing tag after writing each entry, and overwrite it with the next entry... :(

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  • What should I configure when I put Zend project on windows to Ubuntu Lamp?

    - by meyosef
    Hi, What should I configure when I put Zend project on windows to Ubuntu Lamp? (I asking that beacause my Zend progect not working on Ubuntu, its gives first pages, but after i enter to next page its gives me 404 error(page Not Found), I check if rewrite mod enable with : sudo a2enmod rewrite and get: Module rewrite already enabled ::: I dont have such probelm on Zend Ce and Wamp servers on Windows). Thanks, Yosef

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  • Scala xhtml attribute breaks because of a question mark

    - by portoalet
    I had a problem with <iframe id="iframe1" src='http://stockcharts.com/h-sc/ui?s=MT&p=D&yr=2&mn=0&dy=0&id=p43321191731' width="300px" height="300px"></iframe> in Lift web framework (Scala) version Message: java.util.NoSuchElementException scala.RandomAccessSeq$$anon$13.next(RandomAccessSeq.scala:165) scala.xml.parsing.MarkupParser$class.normalizeAttributeValue(MarkupParser.scala:1191) It turned out the question mark ? in the iframe src attribute caused this. What can I do to fix this quickly?

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  • Provisioning problem with certificate and APNs

    - by Florent
    Hi all ! I hava a big problem, here is the deal : I've made an app which has an id, on an another machine i've submit the app to the app store, now i have another mac, and i have made the AppIds using my old mac (so i used an old cer to make the push certificates), next made my apns cert for my server and i have : unable to connect to ssl://gateway.... I do not know what to do because i cannot create another appId using the same id and can't remove an app Id. Thanks to all

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  • TeamCity build number versus Ant build number task

    - by jonny
    I have a build project that I run from TeamCity, now it takes the build.number from TeamCity. I want to be able to use the buildnumber task (Ant) which in my understanding when used, is supposed to change the value of build number property and increment it for next time. But it seems that I still get the build number from TeamCity. How can I use the build number from <buildnumber file="mybuild.number"/>?

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  • Facebook Graph API authorization problem

    - by kujawk
    If I load the following URL in Firefox and login to Facebook, I'm getting a page displaying "An invalid next or cancel parameter was specified." https://graph.facebook.com/oauth/authorize?client_id=c8caf78d724d142ee82334131ef5c9ce&redirect_uri=http://www.facebook.com/connect/login_success.html&type=user_agent&display=touch&scope=offline_access,publish_stream But if I change the display parameter to display=page I no longer get this error. Any ideas as to why?

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  • Ecmascript 5 Date.parse for ISO 8601 test cases

    - by 4esn0k
    What results is right for next test cases? //Chrome Opera Firefox IE 9 Safari console.log(Date.parse("2012-11-31T23:59:59.000Z"));//1354406399000 NaN NaN 1354406399000 NaN console.log(Date.parse("2012-12-31T23:59:59.000Z"));//1356998399000 1356998399000 1356998399000 1356998399000 1356998399000 console.log(Date.parse("2012-12-31T23:59:60.000Z"));//NaN NaN NaN NaN 1356998400000 console.log(Date.parse("2012-04-04T05:02:02.170Z"));//1333515722170 1333515722170 1333515722170 1333515722170 1333515722170 console.log(Date.parse("2012-04-04T24:00:00.000Z"));//NaN 1333584000000 1333584000000 1333584000000 1333584000000 console.log(Date.parse("2012-04-04T24:00:00.500Z"));//NaN NaN 1333584000500 1333584000500 NaN

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  • SQL Server combining 2 rows into 1 from the same table

    - by Maton
    Hi, I have a table with an JobID (PK), EmployeeID (FK), StartDate, EndDate containing data such as: 1, 10, '01-Jan-2010 08:00:00', '01-Jan-2010 08:30:00' 2, 10, '01-Jan-2010 08:50:00', '01-Jan-2010 09:05:00' 3, 10, '02-Feb-2010 10:00:00', '02-Feb-2010 10:30:00' I want to return a record for each EndDate for a Job and then the same employees StartDate for his next immediate job (by date time). So from the data above the result would be Result 1: 10, 01-Jan-2010 08:30:00, 01-Jan-2010 08:50:00 Result 2: 10, 01-Jan-2010 09:05:00, 02-Feb-2010 10:00:00 Greatly appreciate any help!

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  • shopping cart to email

    - by marc-andre menard
    I use simplecartjs to make a shopping cart on my website where you can select element and send it to your cart... next step, will be the checkout process, but for business reason, no checkout process will append, and a simple form with name and email and date for order pickup will be ask. Now the order must be send to an email address (at the company) that will fullfill the order. The question : how to send the content of the cart to an email body or as attachement ?

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  • Database: Storing Dates as Numeric Values

    - by Chin
    I'm considering storing some date values as ints. i.e 201003150900 Excepting the fact that I lose any timezone information, is there anything else I should be concerned about with his solution? Any queries using this column would be simple 'where after or before' type lookups. i.e Where datefield is less than 201103000000 (before March next year). currently the app is using MSSQL2005. Any pointers to pitfalls appreciated.

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  • Background-image won't change using jquery in IE6

    - by slav
    There is a panel on my page with no default background-image css. On load it is set with jquery to an initial image, waits for 10 seconds then loads a random image out of some predetermined images. There are previous and next buttons which allow you to cycle through the images. In ie6 the initial image loads and then a random image also loads after 10 seconds, however pressing prev/next causes the background to become white and the images aren't loaded. With alerts I was able to find that it's still keeping track of the position and url of the image it's supposed to load, but just won't load it. Here is the code below. <script type="text/javascript"> var facts = new Array(); var position; $(document).ready(function() { <xsl:for-each select="$currentPage/ancestor-or-self::node[@level=1]/../node[@nodeName='Fun Fact Folder']/node"> facts[<xsl:value-of select="position()" />] = '<xsl:value-of select="." />'; </xsl:for-each> if(window.location.pathname == "/homepage.aspx" || window.location.pathname == "/") { $(".fun_facts_bg").css("background-image", "url(images/fun_fact_homepage.JPG)"); setTimeout("randomFact()",10000); } else { randomFact(); } }); function randomFact() { $("a.previous_button").css("display", "block"); $("a.next_button").css("display", "block"); position = Math.ceil(Math.random() * (facts.length - 1)); changeFact(0); } function changeFact(increment) { position = checkPosition(position, increment); $(".fun_facts_bg").css("background-image", "url(" + facts[position] + ")"); } <xsl:text disable-output-escaping="yes">&lt;!--//--&gt;&lt;![CDATA[//&gt;&lt;!-- function checkPosition(currentPos, increment) { currentPos = currentPos + increment; if (currentPos &gt; facts.length - 1) { currentPos = 1; } else if (currentPos &lt; 1) { currentPos = facts.length - 1; } return currentPos; } //--&gt;&lt;!]]&gt;</xsl:text> </script> <a class="previous_button" href="javascript:void(0);" onclick="changeFact(-1);"> <a class="next_button" href="javascript:void(0);" onclick="changeFact(1);">

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  • I want to display a Blank Gridview in asp.net

    - by Vibin Jith
    I want to display a blank Gridview Like this.By this way iant to enter the details through grid like windows app. In first a grid with blank row which is in edit mode comes and after update Next row will come. how can i do this? Any logic. I created the itemtemplates but without a data Source it does not showing nothng.

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  • iphone xml handing

    - by Mitch
    I want my app to read a XML via internet. Also I want to keep the previously download xml so next time I may not need to download again until certain hours is passed or whatever period of time according to settings. Do you recommend me to download it first and store locally before process it? Or should I process it while downloading (with libxml2 I guess)? What do you usually with apps using remote XML? Targeting 3.0 devices btw.

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  • Console.Write Not Working

    - by Steven
    I created a VB.NET Windows Forms Application in Visual Studio 2008. When I run my program from the command-line, I get no output (only the next prompt). Why? Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Debug.Write("Foo") Debug.Flush() Console.WriteLine("foo") Console.Beep(800, 100) 'confirm this function is called' Me.Close() End Sub

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  • Using the Google AJAX Search API for SEO Purposes

    - by User
    I am looking at writing a .net application that uses the Google AJAX Search API to determine where our website falls for a given term compared to a competitor. I can find alot about the old SOAP API however for the new AJAX api I cannot find any information on the following: Is this sort of use allowed as the Terms of use are vague Is there a limit to the number of requests per day As you can only get a max of 8 results at a time, is the only way to get the top 100 results to keep requesting the next set and is this an issue? Thanks

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  • .htaccess | Adding A Second Vanity URL

    - by Necro.
    I want to take my .htaccess file and add a second rule for another vanity URL as I already have one declaring the page. So how would I write it so I can go to my page, and the next vanity being a variable for a profile? Ex:// mywebsite.com/page/profile Here is my current .htaccess file. RewriteEngine On RewriteBase / RewriteRule ^([a-zA-Z0-9-]+)$ index.php?p=$1 [L] RewriteRule ^([a-zA-Z0-9-]+)/$ index.php?p=$1 [L]

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  • How do I recover from an unchecked exception?

    - by erickson
    Unchecked exceptions are alright if you want to handle every failure the same way, for example by logging it and skipping to the next request, displaying a message to the user and handling the next event, etc. If this is my use case, all I have to do is catch some general exception type at a high level in my system, and handle everything the same way. But I want to recover from specific problems, and I'm not sure the best way to approach it with unchecked exceptions. Here is a concrete example. Suppose I have a web application, built using Struts2 and Hibernate. If an exception bubbles up to my "action", I log it, and display a pretty apology to the user. But one of the functions of my web application is creating new user accounts, that require a unique user name. If a user picks a name that already exists, Hibernate throws an org.hibernate.exception.ConstraintViolationException (an unchecked exception) down in the guts of my system. I'd really like to recover from this particular problem by asking the user to choose another user name, rather than giving them the same "we logged your problem but for now you're hosed" message. Here are a few points to consider: There a lot of people creating accounts simultaneously. I don't want to lock the whole user table between a "SELECT" to see if the name exists and an "INSERT" if it doesn't. In the case of relational databases, there might be some tricks to work around this, but what I'm really interested in is the general case where pre-checking for an exception won't work because of a fundamental race condition. Same thing could apply to looking for a file on the file system, etc. Given my CTO's propensity for drive-by management induced by reading technology columns in "Inc.", I need a layer of indirection around the persistence mechanism so that I can throw out Hibernate and use Kodo, or whatever, without changing anything except the lowest layer of persistence code. As a matter of fact, there are several such layers of abstraction in my system. How can I prevent them from leaking in spite of unchecked exceptions? One of the declaimed weaknesses of checked exceptions is having to "handle" them in every call on the stack—either by declaring that a calling method throws them, or by catching them and handling them. Handling them often means wrapping them in another checked exception of a type appropriate to the level of abstraction. So, for example, in checked-exception land, a file-system–based implementation of my UserRegistry might catch IOException, while a database implementation would catch SQLException, but both would throw a UserNotFoundException that hides the underlying implementation. How do I take advantage of unchecked exceptions, sparing myself of the burden of this wrapping at each layer, without leaking implementation details?

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