Eager loading usingwith() If we eager load using with(), for example: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 $users=User::with('comments')->get(); if we have 5 users, the following two queries get run immediately:
“Lazy” eager loading using load()In this approach, we can separate the two queries, first by getting the initial result:$users = User::all(); which runs:select * from `users` And later, if we decide(based on some condition) that we need the related comments for all these users, ...
“Eager” here means that we’re associating all the related models for a particular result set using just one query, as opposed to having to run n queries, where n is the number of items in the initial set. Eager loading usingwith() If we eager load using with(), for example: $use...
{ $post = Post::with('comments.user')->find($post->id); return view('posts.show', compact('post')); } 我们看这句话Post::with('comments.user'), 意思是查询的时候加载post的关系comments, 而.user是指加载comments的关系时,还需要加载comments的关系user。 这样就能解决多次查询的问题了。 我们...
“Lazy” eager loading usingload() In this approach, we can separate the two queries, first by getting the initial result: $users=User::all(); which runs: select*from`users` And later, if we decide(based on some condition) that we need the related comments for all these users, we ca...
Laravel Eloquent Eager Loading 是一种优化数据库查询的方法,可以避免在一个循环中多次查询数据库而导致的性能问题。 当需要获取一个模型及其关联模型的数据时,如果使用常规的查询方法,每个关联模型都会独立执行一条数据库查询,从而导致数据库查询次数的增加和潜在的性能问题。而使用 Eager Loading,则可以预先加载关联数据...
这标题难道不是自相矛盾吗?又Lazy,又Eager? 哦,原来是在lazy的流程里判断需不需要eager loading一下: $books = App\Book::all(); if($someCondition) { $books->load('author','publisher'); } $books->load(['author'=>function($query){ ...
说明:本文主要说明Laravel Eloquent的延迟预加载(Eager Loading),使用延迟预加载来减少MySQL查询次数。同时,会将开发过程中的一些截图和代码黏上去,提高阅读效率。 botkenni 2022/01/10 2.7K0 具有嵌套关系的可重用API资源——Laravel5.5 controllerlaravel-5.5api 本文内容主要围绕在 Laravel 5.5 中使用 API 开发的重要...
Instead, you should handle eager loading directly in your query logic. However, you can use the with method in your query to achieve this. Custom Controller or Data Provider: If API Platform does not natively support eager loading through configuration, you might need to create a custom ...
“Lazy” eager loading usingload() In this approach, we can separate the two queries, first by getting the initial result: $users = User::all(); 1. which runs: select * from `users` 1. And later, if we decide(based on some condition) that we need the related comments for all the...