Sometimes you may wish to throw an exception if a model is not found. This is particularly useful in routes or controllers. The findOrFail and firstOrFail methods will retrieve the first result of the query; however, if no result is found, a Illuminate\Database\Eloquent\ModelNotFoundException...
The Eloquentallmethod will return all of the results in the model's table. Since each Eloquent model serves as aquery builder, you may also add constraints to queries, and then use thegetmethod to retrieve the results: Eloquent的 all 方法将返回所有的模型数据表里的内容, 因为每个Eloquent模型代...
A one-to-one relationship is a very basic relation. For example, a User model might have one Phone. We can define this relation in Eloquent:1class User extends Eloquent { 2 3 public function phone() 4 { 5 return $this->hasOne('Phone'); 6 } 7 8}The first argument passed to ...
Relationships that return many results will return an instance of the Illuminate\Database\Eloquent\Collection class.Eager LoadingEager loading exists to alleviate the N + 1 query problem. For example, consider a Book model that is related to Author. The relationship is defined like so:...
This closure will be responsible for adding additional publish date constraints to the relationship query:/** * Get the current pricing for the product. */ public function currentPricing(): HasOne { return $this->hasOne(Price::class)->ofMany([ 'published_at' => 'max', 'id' => 'max...
MYSQL vs Laravel的Eloquent 可能是因为您使用双引号设置了$rate_query,$end_date和$start_date被作为php变量计算?尝试使用单引号,还是Nowdoc? 如何使用原始SQl/Laravel进行累积计数-Eloquent的ORM 如果您的mysql版本支持窗口函数,您可以尝试使用SUM窗口函数进行累积计数 DB::table(DB::raw('(select COUNT(*) created...
The Eloquent ORM included with Laravel provides a beautiful, simple ActiveRecord implementation for working with your database. Each database table has a corresponding "Model" which is used to interact with that table. Models allow you to query for data in your tables, as well as insert new ...
When interacting with Eloquent models, you may also use the count, sum, max, and other aggregate methods provided by the Laravel query builder. As you might expect, these methods return a scalar value instead of an Eloquent model instance:...
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EN在前面两篇教程中，学院君陆续给大家介绍了 Eloquent 模型类支持的七种关联关系，通过底层提供的关联...