通过 addSelect 创建的 Laravel 查询字段答案

【问题标题】：How to query field created by addSelect in Laravel?通过 addSelect 创建的 Laravel 查询字段
【发布时间】：2023-01-28 03:13:55
【问题描述】：

我有以下查询，其中我使用 addSelect 函数添加了三个新列

   DB::connection('mysql_slave')
        ->table('applications')
        ->whereNull('applications.deleted_at')
        ->when($column != 'contract_return_date' && $column != 'contract_delivery_date',function ($query) use ($column,$date_from,$date_to){
            return $query->whereBetween('applications.'.$column, [$date_from, $date_to]);
        })
        ->join('customers','applications.customer_id','=','customers.id')
        ->join('departments','applications.department_id','=','departments.id')
        ->select([
            'applications.id',
            'applications.customer_id',
            DB::raw('CONCAT(IFNULL(customers.last_name,"")," ",customers.first_name ) as customers_name'),
            DB::raw('CONCAT(IFNULL(applications.last_name,"")," ",applications.first_name ) as contract_name'),
            'applications.offer_type as offer_type',
            'applications.status_id',
            'applications.contract_no',
            'applications.current_provider',
            'applications.extra_offer',
            'applications.offer_warranty',
            'applications.department_id',               
            'customers.mobile_phone as customer_mobile',
            'applications.program as program',
            'applications.saled_by_text as saler',
            'departments.name as department',
            'applications.created_at as created_at',
            'applications.created_at as saled_at',
            DB::raw('IF(applications.sale=1,"NAI","OXI") as sale'),
        ])

        ->addSelect(['submission_date'=> StatusLog::select('created_at')
            ->whereColumn('application_id','applications.id')
            ->where('status','=',1)
            ->latest()
            ->take(1)
        ])

        ->addSelect(['resubmission_date'=> StatusLog::select('created_at')
            ->whereColumn('application_id','applications.id')
            ->where('status','=',2)
            ->latest()
            ->take(1)
        ])
        ->addSelect(['error_date' => StatusLog::select('created_at')
            ->whereColumn('application_id','applications.id')
            ->whereIn('status', [5, 6])
            ->latest()
            ->take(1)
        ]) ->when($column == 'contract_delivery_date',function ($query) use ($date_from,$date_to){
            return $query->whereBetween('submission_date', [$date_from, $date_to]);

        });

上面的查询用于在数据表上打印数据。

查询包括使用 addSelect 函数添加的列，并且这些列在表中正确显示。

但是，当我尝试查询 submission_date 字段时，遇到错误：

 1054 Unknown Column submission_date.

有没有办法查询在 Laravel 中使用 addSelect 函数创建的列？

感谢您的帮助，对于我的英语中的任何错误，我深表歉意。

【问题讨论】：

您的每个表都有“submission_date”字段？在这种情况下，设置表名。例如，$query->whereBetween('applications.submission_date', [$date_from, $date_to])
@bluestar0505 我试过了。它导致相同的错误
尝试 $query->whereBetween('submission_date.created_at', [$date_from, $date_to]);
哪一个数据库表有专栏submission_date吗？它来自customers、departments 或applications 表吗？请澄清。

标签： php mysql laravel

【解决方案1】：

我认为你不能这样做。自定义选择字段 (submission_date) 在主查询结果之后计算。这是数据库的限制。

但您可以改用 HAVING 运算符。

Use custom column in the where clause from multiple joined tables

【讨论】：