lazy-loading

问题 My problem is the following: I have some python classes that have properties that are derived from other properties; and those should be cached once they are calculated, and the cached results should be invalidated each time the base properties are changed. I could do it manually, but it seems quite difficult to maintain if the number of properties grows. So I would like to have something like Makefile rules inside my objects to automatically keep track of what needs to be recalculated. The

问题 I am using Hibernate 4.2 and build time bytecode instrumentation for solve the lazy issue that appears on a @OneToOne relation and @Lob (https://developer.jboss.org/wiki/SomeExplanationsOnLazyLoadingone-to-one) Do you know what is the difference between : Hibernate bytecode instrumentation : http://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch20.html#performance-fetching-lazyproperties Hibernate bytecode enhancement : http://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch20.html

问题 I'm using OWL Carousel, trying to add class .border-red to <div class="item"> after lazyLoad, means call this function after lazyLoad afterLazyLoad Example : $(".item").addClass("border-red"); when lazy loaded. Means add class function execute after OWLCarousel lazyLoaded. JS $(document).ready(function() { $("#owl-demo").owlCarousel({ items : 4, lazyLoad : true, navigation : true }); }); HTML <div id="owl-demo" class="owl-carousel"> <div class="item"><img class="lazyOwl" data-src="assets/owl1

问题 Lets suppose we have some entity, which has 10 fields. And let's suppose that almost all these fields have very large data. And we want to load entity (not the set of fields!) and at runtime define which fields to load. The solution I found https://stackoverflow.com/a/24710759/5057736 suggests using constructor. But in case of 10 fields and that it is necessary to define fields at runtime is not possible solution. Is there a way how to solve this problem using jpa 2.1? 回答1: Use a JPA 2.1

问题 I have such kind of @OneToOne Hibernate relationShip public class Address implements Serializable { private String id; private String city; private String country; //setter getters ommitted } public class Student implements Serializable { private String id; private String firstName; private String lastName; private Address address; } address Item is mapped as LAZY. Now I want to fetch user and it's address using session.load(Student.class,id); In my daoService. Then I return it as JSON from

问题 I am using JSF 2.2 with PrimeFaces 4.0. I have a <p:dataTable> with live scrolling, lazy loading, row-expansion and cell-editing, etc. <p:dataTable id="dtaTable" selection="#{cont.selectedArray}" resizableColumns="true" draggableColumns="true" var="dataModel" value="#{cont.yieldBondsModel}" editable="true" editMode="cell" selectionMode="multiple" rowSelectMode="add" scrollable="true" scrollHeight="650" rowKey="#{modeld.id}+#{model.name}" rowIndexVar="rowIndex" filterEvent="enter" styleClass=

问题 I'm having issues with Entity Framework and multiple threads and I am wondering if there is a solution that keeps the ability to lazy load. From my understanding the data context is not thread safe which is why when I have multiple threads using the same data context I get various data readers error. The solution to this problem is to use a separate data context for each connection to the database and then destroy the data context. Unfortunately destroying my data context then prevents me

问题 I'm having issues with Entity Framework and multiple threads and I am wondering if there is a solution that keeps the ability to lazy load. From my understanding the data context is not thread safe which is why when I have multiple threads using the same data context I get various data readers error. The solution to this problem is to use a separate data context for each connection to the database and then destroy the data context. Unfortunately destroying my data context then prevents me

问题 I am using Hibernate's lazy loading, and am getting sessionFactory missing exception, even after I have defined a filter in web.xml to use OpenSessionInViewFilter <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <!-- The definition of the Root Spring Container shared by all

问题 Does linq to sql automatically lazy load associated entities? I would think it would but I can't find an article stating it as such. 回答1: Yes, I believe it does. It also has a "load with" feature/semantic that allows you to batch load several things in a shotgun approach. This is useful when you know you'll need related data along with the main entity right off the bat, like to pre-cache all the data you'll need to render a single Web Page etc. 回答2: It depends how you define "lazy-load". If