lazy-loading | 易学教程

JPA Hibernate want lazy load to return empty collection

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问题 I am using JPA-Hibernate at the moment and want collections to be empty until i call the associated get(). I have been trying for several days now without any success. The reason i want this is because i use Exterialize (or Serialize) and do not always want the collections to be there when sending the serialized string over to the client. @Entity public class Thread implements Externalizable { static final long serialVersionUID = 9L; @OneToMany(mappedBy = "parentThread", fetch = FetchType

Hibernate: Does Hibernate Always Use Object Proxies?

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问题 I thought that object proxies are used only when the class has a field of Collection type, and uses Lazy fetching. But some sources seem to suggest that Hibernate 3 uses proxies for all objects regardless of whether the object has field of collection type or not. Can someone please explain when Hibernate uses object proxies? Is it all the time, or just in some cases? 回答1: As per the Hibernate docs : By default, Hibernate uses lazy select fetching for collections and lazy proxy fetching for

NHibernate lazy properties behavior?

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问题 I've been trying to get NHibernate into development for a project I'm working on at my workplace. Since I have to put a strong emphasis on performance, I've been running a proof-of-concept stress test on an existing project's table with thousands of records, all of which contain a large text column. However, when selecting a collection of these records, the select statement takes a relatively long time to execute; apparently due to the aforementioned column. The first solution that comes to

Hibernate/Spring: Session still closed before retrieval of child collection even with @Transactional on Service method

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问题 Hello Spring/Hibernate Gurus! in a time like this i would like you to be my best friends.I am working on a project using hibernate 3.6.1.Final JPA implementation using session and spring 3.0.5.RELEASE with maven.So with maven project is split in 3 modules model module, service module and webapp module. where is snippet of the model applicationContext  <tx:annotation-driven transaction-manager="transactionManager" /> <bean id="transactionManager" class="org

Make 2nd API calls when all contents are loaded (lazy loading) from the first API call in React js

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问题 I have some .json files. I need to show all the data from the first .json file in browser as lazy loading.I need to make API call to the second .json when all contents are loaded from the first .json file (when user scoll to end of the page) . I should not make all API call at a time. How to do this using react js. 回答1: Make use of javascript scroll eventListener and calculate the window scroll height in order to trigger the async call. Please bind the necessary method in the constructor and

Clicking “More” button via selenium

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I am trying to scrape the following website : https://angel.co/companies There is a "More" button at the bottom, which on click loads more records. I need to click the button via selenium. I tried the following: python_button = driver.find_elements_by_class_name("more") python_button.click() However its not finding the appropriate button, i.e. my python_button returns an empty list. I tried the following: python_button = driver.find_element_by_class_name("more") And this gives the following error: Message: no such element: Unable to locate element: {"method":"class name","selector":"more"} Any

Javascript: Lazy Load Images In Horizontal Div?

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I have a div that has a bunch of thumbnails showing horizontally (with a horizontal scrollbar). Is there a way to lazy load these thumbnails and only show them once the user horizontally scrolls to their position? All the examples I've seen check the browser window, not a div. This is for contest entries so sometimes there are hundreds of entries, which drastically affects performance. Thanks in advance. I forked the lazy load plugin for jQuery and added support for lazy-loading images in a container div. The lazy load plugin for jQuery now supports this directly. It shouldn't be too hard to

Waiting on Lazy Loaded objects without lockup?

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问题 I already have code which lazy loads scripts on request. My issue now is waiting to execute certain code until the object becomes available. I can't use a setTimeout() because it does not block execution. So what is a good way to 'wait' for a load, without locking the browser? Again, can't use raw setTimeout(). 回答1: Assuming you control the contents of your script, you can put some code to execute at the bottom of your lazy loaded script to indicate to the main page that the script has loaded

Waiting on Lazy Loaded objects without lockup?

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I already have code which lazy loads scripts on request. My issue now is waiting to execute certain code until the object becomes available. I can't use a setTimeout() because it does not block execution. So what is a good way to 'wait' for a load, without locking the browser? Again, can't use raw setTimeout(). Assuming you control the contents of your script, you can put some code to execute at the bottom of your lazy loaded script to indicate to the main page that the script has loaded. For example, in your page you can do something like this: var loadingScripts = 0; var loadScript =

Hibernate: Does Hibernate Always Use Object Proxies?

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I thought that object proxies are used only when the class has a field of Collection type, and uses Lazy fetching. But some sources seem to suggest that Hibernate 3 uses proxies for all objects regardless of whether the object has field of collection type or not. Can someone please explain when Hibernate uses object proxies? Is it all the time, or just in some cases? JamesENL As per the Hibernate docs : By default, Hibernate uses lazy select fetching for collections and lazy proxy fetching for single-valued associations. These defaults make sense for most associations in the majority of