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  • id vs class selection benchmark

    - by zaf
    Has anybody bench marked selecting elements with id's and class's from CSS and javascript? It would make sense that an element with an id is faster to select than if it had a class even if it was the only element with that class. Do I really need to be concerned?

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  • Unique id of a column

    - by Kayes
    Hi. Does each column of a table in SQL Server have a unique id? I've looked into sys.columns and the column_id there is merely the order of the columns which changes if the order of the column is changed. I'd like to know if SQL Server maintains a unique id for each column as it does for each table and other objects. And if it does, how can I get that? Thanks.

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  • Loading the last related record instantly for multiple parent records using Entity framework

    - by Guillaume Schuermans
    Does anyone know a good approach using Entity Framework for the problem described below? I am trying for our next release to come up with a performant way to show the placed orders for the logged on customer. Of course paging is always a good technique to use when a lot of data is available I would like to see an answer without any paging techniques. Here's the story: a customer places an order which gets an orderstatus = PENDING. Depending on some strategy we move that order up the chain in order to get it APPROVED. Every change of status is logged so we can see a trace for statusses and maybe even an extra line of comment per status which can provide some extra valuable information to whoever sees this order in an interface. So an Order is linked to a Customer. One order can have multiple orderstatusses stored in OrderStatusHistory. In my testscenario I am using a customer which has 100+ Orders each with about 5 records in the OrderStatusHistory-table. I would for now like to see all orders in one page not using paging where for each Order I show the last relevant Status and the extra comment (if there is any for this last status; both fields coming from OrderStatusHistory; the record with the highest Id for the given OrderId). There are multiple scenarios I have tried, but I would like to see any potential other solutions or comments on the things I have already tried. Trying to do Include() when getting Orders but this still results in multiple queries launched on the database. Each order triggers an extra query to the database to get all orderstatusses in the history table. So all statusses are queried here instead of just returning the last relevant one, plus 100 extra queries are launched for 100 orders. You can imagine the problem when there are 100000+ orders in the database. Having 2 computed columns on the database: LastStatus, LastStatusInformation and a regular Linq-Query which gets those columns which are available through the Entity-model. The problem with this approach is the fact that those computed columns are determined using a scalar function which can not be changed without removing the formula from the computed column, etc... In the end I am very familiar with SQL and Stored procedures, but since the rest of the data-layer uses Entity Framework I would like to stick to it as long as possible, even though I have my doubts about performance. Using the SQL approach I would write something like this: WITH cte (RN, OrderId, [Status], Information) AS ( SELECT ROW_NUMBER() OVER (PARTITION BY OrderId ORDER BY Id DESC), OrderId, [Status], Information FROM OrderStatus ) SELECT o.Id, cte.[Status], cte.Information AS StatusInformation, o.* FROM [Order] o INNER JOIN cte ON o.Id = cte.OrderId AND cte.RN = 1 WHERE CustomerId = @CustomerId ORDER BY 1 DESC; which returns all orders for the customer with the statusinformation provided by the Common Table Expression. Does anyone know a good approach using Entity Framework?

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  • XPath select tags by id not descendants of

    - by Stefano
    I have the following code and I have to select all the nodes with id="text" but not the nodes that already have a parent with id="text": test00 test01 test02 * test03 * so in this example the query have to return only the two fo:block with content test00 and test03. Thank you.

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  • How to check user id already exists

    - by Sheery
    Hi Friends, I am a beginner coder, i am building a project using C# Asp.Net in which i am registering users with a user id, now my question is that how to check that the user id is already exists in the user table or not when user trying to register, i am using sql server 2000?

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  • Selecting by ID in Castle ActiveRecord

    - by ripper234
    How can I write a criteria to return all Orders that belong to a specific User? public class User { [PrimaryKey] public virtual int Id { get; set; } } public class Order { [PrimaryKey] public virtual int Id { get; set; } [BelongsTo("UserId")] public virtual User User { get; set; } } return ActiveRecordMediator<Order>.FindAll( // What criteria should I write here ? );

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  • Parsing a Vimeo ID using Javascript?

    - by Tom
    Hi, Could anyone point me in the right direction to parse an ID from a Vimeo URL in Javascript? The URL will be entered by a user so I will need to check that they have entered it in the correct format. I need the ID so that I can use their simple API to retrieve video data. Any help appreciated.

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  • asp.net submit form to new window, retrieve unique id

    - by Joo Park
    On Page1.aspx...I have the following ...more hiddenFields Page2.aspx would be displayed in a new window and I need to grab the hiddenField values on this page. I can now get it to open in a new window and get those form values. The problem is lnkBtn is repeated in a listview and each link has a different value or id associated with the link. How do I pass in the unique id to Page2.aspx and grab the hiddenField?

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  • How do I convert a Twitter User ID to a Twitter Username

    - by codyvbrown
    Hi I'm building an app in rails that needs to convert a twitter id into the twitter username. This is the code that pulls the id. url = 'http://twitter.com/' + params[:username] buffer = open(url, 'UserAgent' = 'irb').read @vouched_user_twitter_id = buffer[/\d+(?=.rss)/] How do I use that number to pull the username once i no longer have params. Thanks!

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  • SlickGrid V2.0 Column name/id does not follow column when dragging

    - by Brian
    I have an application (using SlickGrid) where I need to get the column name or id at any time when user clicks on a cell (this pulls up a menu specific to the data in that column/cell). Grid works fine initially but if the column is moved (drag/drop), the column name/id does not follow the drop but remains mapped to it's initial column position. Has anyone else seen this and, if so, how did you fix it? Thanks

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  • Getting ID of all elements of a certain class into an array

    - by Tommy Coffee
    Here's what I' trying to do: Currently I am using this to create an array of all elements matching the class name of '.cookie'. Right now I am getting the text value of that element, which is not what I need: var getAllCookies = $('.cookie').text(); var cookiesArray = jQuery.makeArray(getAllCookies); alert(cookiesArray[0]); What I need is to find all elements of a certain class (.cookie), get that elements ID value and store that ID value inside of array.

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