在Laravel的Eloquent ORM中,使用join后进行sum操作可能会遇到不正确的问题,这通常是由于查询中的重复记录或分组问题导致的。以下是一些基础概念和相关解决方案。 基础概念 Eloquent ORM: Laravel的默认ORM,用于数据库交互。 Join: SQL操作,用于将两个或多个表的行组合起来,基于某些相关的列之间的关系。 Sum: SQL聚合...
The update method expects an array of column and value pairs representing the columns that should be updated.When issuing a mass update via Eloquent, the saving, saved, updating, and updated model events will not be fired for the updated models. This is because the models are never actually ...
For Eloquent methods likeallandgetwhich retrieve multiple results, an instance ofIlluminate\Database\Eloquent\Collectionwill be returned. TheCollectionclass providesa variety of helpful methodsfor working with your Eloquent results. Of course, you may simply loop over this collection like an array: 因...
此外,请确保价格列的数据类型是数字,以便sum函数能够正确计算总和。 最后,您可以尝试通过调用$transaction->toSql()检查生成的SQL查询来调试这个问题,并查看它是否使用应用的筛选器正确地生成了sum查询。 $total = $transaction->sum('price'); dd($total, $transaction->toSql()); 这将有助于您识别查询生成中...
If you do not wish to have these columns automatically managed by Eloquent, set the $timestamps property on your model to false:1<?php 2 3namespace App; 4 5use Illuminate\Database\Eloquent\Model; 6 7class Flight extends Model 8{ 9 /** 10 * Indicates if the model should be ...
If you do not wish to have these columns automatically managed by Eloquent, set the $timestamps property on your model to false:1<?php 2 3namespace App; 4 5use Illuminate\Database\Eloquent\Model; 6 7class Flight extends Model 8{ 9 /** 10 * Indicates if the model should be ...
如何获得数量的总和并发送到另一个表(laravel)要创建或更新记录，请使用laravelfirstOrNew方法如下：Feed...
Instead of comparing two columns, these methods will compare the column against a value:DB::table('users') ->join('contacts', function ($join) { $join->on('users.id', '=', 'contacts.user_id') ->where('contacts.user_id', '>', 5); }) ->get(); ...
它们被称为聚合函数，在Laravel中有这些Laravel聚合的Eloquent等价物，使用这些方法，您将能够在查询端而...
You may also use the create method to save a new model in a single line. The inserted model instance will be returned to you from the method. However, before doing so, you will need to specify either a fillable or guarded attribute on the model, as all Eloquent models protect against ...