lazy-loading

Clarifying terminology : “Hydrating” an entity : Fetching properties from the DB

由 别说谁变了你拦得住时间么 提交于 2019-11-26 19:39:45
问题 In the context of ORM / Lazy loading of entities, my understanding of the term "Hydration" is as follows: "Hydrating" describes the process of populating some or all of the previously unpopulated attributes of an entity fetched using lazy loading. Eg: class Author is loaded from the database: @Entity class Author { @Id long id; List<Book> books; } Initially, the books collection is not populated. It is my understanding that the process of loading the books collection from the database is

Progressive loading in ng-repeat for images, angular js

由 故事扮演 提交于 2019-11-26 19:25:08
问题 How do I implement progressive loading of content as you scroll down the page? Otherwise 1000 images would load at the same time. 回答1: Use infinite scrolling directive. ngInfiniteScroll DEMO HTML <div ng-app='myApp' ng-controller='DemoController'> <div infinite-scroll='loadMore()' infinite-scroll-distance='2'> <img ng-repeat='image in images' ng-src='http://placehold.it/225x250&text={{image}}'> </div> </div> JS var myApp = angular.module('myApp', ['infinite-scroll']); myApp.controller(

Implementation of Lazy<T> for .NET 3.5

由 谁说我不能喝 提交于 2019-11-26 19:15:28
问题 .NET 4.0 has a nice utility class called System.Lazy that does lazy object initialization. I would like to use this class for a 3.5 project. One time I saw an implementation somewhere in a stackoverflow answer but I can't find it anymore. Does someone have an alternative implementation of Lazy? It doesn't need all the thread safety features of the framework 4.0 version. Updated: Answers contain a non thread safe and a thread safe version. 回答1: Here is an implementation that I use. ///

Cached property vs Lazy<T>

由 落爺英雄遲暮 提交于 2019-11-26 19:05:50
问题 In .NET 4 the following snippet with a cached property can also be written using the System.Lazy<T> class. I measured the performance of both approaches and it's pretty much the same. Is there any real benefit or magic for why I should use one over the other? Cached Property public static class Brushes { private static LinearGradientBrush _myBrush; public static LinearGradientBrush MyBrush { get { if (_myBrush == null) { var linearGradientBrush = new LinearGradientBrush { ...};

How to query data for Primefaces dataTable using lazy loading and pagination

由 自作多情 提交于 2019-11-26 18:46:21
In my JSF's datatable I have implemented lazy loading and when I paginate through records it is taking time about 4 or 5 seconds to execute next set of records, actually it should be take less than a second to execute the results. This has happened to the way I have implemented it, not sure how could I resolve this. DataModel class which extends LazyDataModel @Override public List<Request> load(int startingAt, int maxPerPage, String sortField, SortOrder sortOrder, Map<String, String> filters) { requestList = requestService.getRequest(startingAt, maxPerPage, sortField, sortOrder, filters); this

Entity Framework: I set the foreign key, SaveChanges then access the navigation property, but it doesn't load the related entity. Why not?

由 允我心安 提交于 2019-11-26 17:59:14
问题 I am using this Entity class with Entity Framework 5 Code First: public class Survey { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int ID { get; set; } public string SurveyName { get; set; } [Required] public int ClientID { get; set; } [ForeignKey("ClientID")] public virtual Client Client { get; set; } } And in my Controller's Create method I do this: Survey entity = new Survey() { SurveyName = "Test Name", ClientID = 4 }; db.Surveys.Add(entity); db.SaveChanges(); Client c1 =

Doctrine 2 ArrayCollection filter method

由 荒凉一梦 提交于 2019-11-26 17:59:12
问题 Can I filter out results from an arrayCollection in Doctrine 2 while using lazy loading? For example, // users = ArrayCollection with User entities containing an "active" property $customer->users->filter('active' => TRUE)->first() It's unclear for me how the filter method is actually used. 回答1: The Boris Guéry answer's at this post, may help you: Doctrine 2, query inside entities $idsToFilter = array(1,2,3,4); $member->getComments()->filter( function($entry) use ($idsToFilter) { return in

AngularJS- Dynamic Loading of script files using LazyLoad- Webpack

由 こ雲淡風輕ζ 提交于 2019-11-26 17:22:50
问题 Right now in my index.html page I have links to two CDN files one being a JS and the other a CSS file. i.e. in the the bottom of my body https://somedomain.com/files/js/js.min.js and in the head https://somedomain.com/files/css/css.min.css But right now they aren't needed on my homepage but just in one particular route. So I was looking into how I can lazy load these CDN resources when that routes gets hit i.e. /profile and only then ? These aren't installed via bower or npm but just loaded

Hibernate - Avoiding LazyInitializationException - Detach Object From Proxy and Session

由 流过昼夜 提交于 2019-11-26 17:17:07
问题 MyObject myObject = repositoryHibernateImpl.getMyObjectFromDatabase(); //transaction is finished, and no, there is not an option to reopen it ThirdPartyUtility.doStuffWithMyObjectType( myObject ); at this point you've already defined what is lazy and eager loaded, and the third party utility will try to call all of the methods on your "myObject" instance, this is fine because you don't want to return anything for the lazily loaded properties, unfortunately it doesn't return null, it throws a

Primefaces DataTable, lazy loading and CommandButton per row

由 泄露秘密 提交于 2019-11-26 16:56:06
问题 i have this simple page: <h:form id="form"> <p:dataTable value="#{testBean.unitTypeModel}" var="elem" lazy="true" rows="10"> <p:column headerText="class">#{elem.class.simpleName}</p:column> <p:column headerText="code">#{elem.code}</p:column> <p:column headerText="description">#{elem.description}</p:column> <p:column headerText="action"> <p:commandButton action="test2" icon="ui-icon ui-icon-wrench" value="edit"> <f:setPropertyActionListener target="#{testBean.selection}" value="#{elem}"/> </p
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