除了withCount 方法外,Eloquent 还提供了 withMin, withMax, withAvg 和withSum 等聚合方法。这些方法会通过 {relation}_{function}_{column} 的命名方式将聚合结果添加到获取到的模型属性中:use App\Models\Post;$posts = Post::withSum('comments', 'votes')->get();foreach ($posts as $post) { echo...
*/publicfunctionuser(){return$this->belongsTo(User::class)->withDefault();} 如果想要这个默认模型中包含一些属性的话,那么您可以向withDefault方法中传递一个数组或者一个闭包: /** * 获取这篇博客所属的用户。 */publicfunctionuser(){return$this->belongsTo(User::class)->withDefault(['name'=>'Gue...
需要注意的是集合并不是Laravel 中独有的,许多语言都可以在数组中使用集合式编程,但非常遗憾,原生的PHP 是不支持集合式编程的,不过幸运的是,一些勤劳的...
$collection->each(function (int $item, int $key) { if (/* condition */) { return false; } });eachSpread()eachSpread 方法迭代集合的项目,将每个嵌套项目值传递给给定的回调:$collection = collect([['John Doe', 35], ['Jane Doe', 33]]); $collection->eachSpread(function (string $name...
$collection->each(function (int $item, int $key) { if (/* condition */) { return false; } }); eachSpread() eachSpread 方法迭代 collection 的项目,将每个嵌套的项目值传递给给定的回调: php $collection = collect([['John Doe', 35], ['Jane Doe', 33]]); $collection->eachSpread...
->selectRaw('price * ? as price_with_tax ' , [1.0825]) ->get(); whereRaw/orWhereRaw whereRaw 和 orWhereRaw 方法将原生得where 注入到你得查询中。这两个方法得第二个参数还是可选项,值还是绑定参数得数组: $orders = DB::table('orders') ...
if (/* some condition */) { return false; } }); every() every方法创建一个包含数组第n-th个元素的新集合: $collection = collect(['a','b','c','d','e','f']); $collection->every(4);//['a','e'] 还可以选择指定从第几个元素开始: ...
In SQL Server delete duplicates of date leaving only one record as per date Removing ConnectionString when deploying with Visual Studio 2012 Delete event not emitted Why does this give me infinite loop? How do you use Tasks to spin off lots of "Fire and Forget" work?
join query using this post. While you don't need to use it if you're using data relationships, this can be helpful if you're not. In this example, we'll demonstrate how to add a simple inner join in Laravel and how to add multiple conditions with the on method. See the...
Laravel是一种流行的PHP开发框架,用于构建Web应用程序。它提供了许多便捷的功能和工具,使开发人员能够快速构建高质量的应用程序。 在Laravel中,WHERE子句用于过滤数据库查询结果。它允许我们根据特定的条件来选择需要的数据。 数学运算符可以在Laravel的WHERE子句中使用,以便根据数学条件来过滤数据。以下是一些常用的数学...