版本1 require('class\class1.php'); require('class\class1.php'); if($is_girl){ echo 'this is a girl'; $class1 = new Class1; }else{ echo "this is a boy"; $class2 = new Class2; } 版本2 if($is_girl){ echo 'this is a girl'; require('class\class1.php'); $…
Introduction Lazy loading is a concept where we delay the loading of the object until the point where we need it. Putting in simple words, on demand object loading rather than loading objects unnecessarily. For example, consider the below example whe…
We've looked at lazy loading with ocLazyLoad previously, but what if we are using ui-router and want to lazy load modules when we change states? angular.module("demo", ["ui.router", "oc.lazyLoad"]) .config(function ($statePro…
With the ocLazyLoad you can load AngularJS modules on demand. This is very handy for runtime loading of Angular modules in large applications. Simple example: angular.module("demo", ["oc.lazyLoad"]) .controller("AppCtrl", fun…
Why bother lazy loading and purging pages, you ask? Well, in this example, it won't matter too much if you load all the pages at the start, since there are only five and they won't be large enough to eat up too much memory. But imagine you had 100 pa…
EntityFramework Eagerly Loading Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved by use of the Include method. For example, the queries below will load blo…
Posted on January 25, 2012 by Matthieu MEZIL 01/26/2012: Code update Imagine the following scenario: you have a WCF service with two methods: List<Customer> GetCustomers(); List<Order> GetOrders(int CustomerId); You want a treeview with lazy l…
Lazy Loading: One of the important functions of Entity Framework is lazy loading. Lazy loading means delaying the loading of related data, until you specifically request for it. For example, Student class contains StudentAddress as a complex property…
Found the way to handle Auxiliary router for lazy loading moudle and erge load module are different. In Erge loading, it is recommended to create a shell component, inside shell component you need to define the router-outlet for each Auxiliary routes…
Use a blank.gif as the src of images, and include the width and height of the final image. HTML: <img src="blank.gif" class="lazy" data-src="http://cdn.css-tricks.com/images/full-size.jpg" width="240" height=&quo…
懒加载的原理 mybatis 会循环处理结果集中返回的每行数据的,在处理之前首先会通过反射调用构造方法来创建 result 对象,结果集中的一行数据最终会映射为一个 result 对象(严格的来说是不对的,结果集中的一行数据在多表连接的情况下可能会映射为多个 result 对象,结果集中的一行数据在多表连接一对多的情况下结果集中的多行数据可能映射一个 result 对象,简单的单表查询结果集中的一行数据映射为一个 result 对象). 其实在调用构造方法创建 result 对象的时候,构造方法…
延迟加载:延迟加载相关的数据 using (var ctx = new SchoolDBEntities()) { //Loading students only IList<Student> studList = ctx.Students.ToList<Student>(); Student std = studList[]; //Loads Student address for particular Student only (seperate SQL query) Stud…
延迟加载:延迟加载相关的数据 using (var ctx = new SchoolDBEntities()) { //Loading students only IList<Student> studList = ctx.Students.ToList<Student>(); Student std = studList[]; //Loads Student address for particular Student only (seperate SQL query) Stud…
官网原文:http://www.yiiframework.com/doc/guide/1.1/zh_cn/database.arr 官网中后半段为英文,而且中文的内容比英文少一些,先放到这里,之后有时间再翻译. 我们已经了解了怎样使用 Active Record (AR) 从单个数据表中获取数据. 在本节中,我们讲解怎样使用 AR 连接多个相关数据表并取回关联(join)后的数据集. 为了使用关系型 AR,我们建议在需要关联的表中定义主键-外键约束.这些约束可以帮助保证相关数据的一致性和完整性.…
