如何从日期中提取日、月和年？

Question

我只是不知道如何从日期中获取日期、月份和年份。

这里是雄辩的

 public function query(Detail $model)
    {
    return $model->newQuery()->leftjoin('fishers','fishers.id', '=','details.fisher_id')
    ->leftjoin('species','species.id', '=', 'details.species_id')
    ->leftjoin('purposes','purposes.id', '=', 'details.purpose_id')
    ->leftjoin('islands','islands.id', '=', 'fishers.island_id')
    ->leftjoin('preservations','preservations.id', '=', 'details.preservation_id')   
    ->select('fishers.*','details.*','details.indate','islands.island_name','fishers.fisher_first_name','fishers.fisher_last_name','details.weight','species.species_name','purposes.purpose_name','preservations.preservation_name');
   }

我曾尝试使用Month(details.indate) as Month, Year(details.indate) as Year但似乎不起作用。 我使用 date 作为indate的数据类型，当我将Month(details.indate) as Month我收到此错误：

SQLSTATE[42S22]: COLUMN NOT FOUND: 1054 UNKNOWN COLUMN 'Month(details.indate)' IN 'field list' (SQL: SELECT fishers.* , details.* , MONTH(details.indate) AS MONTH

这是我的数据表列

   protected function getColumns()
    {
        return [
            [ 'data' => 'purpose_name', 'name' => 'purposes.purpose_name', 'title' => 'Purpose' ],
            [ 'data' => 'fisher_first_name', 'name' => 'fishers.fisher_first_name', 'title' => 'Fisher Name' ],
            [ 'data' => 'preservation_name', 'name' => 'preservations.preservation_name', 'title' => 'Preservation Methods' ],
            [ 'data' => 'species_name', 'name' => 'species.species_name', 'title' => 'Species Name' ],
            [ 'data' => 'island_name', 'name' => 'islands.island_name', 'title' => 'Island Name' ],
            [ 'data' => 'weight', 'name' => 'details.weight', 'title' => 'Weight' ],
            [ 'data' => 'indate', 'name' => 'details.indate', 'title' => 'Month' ],
            [ 'data' => 'indate', 'name' => 'details.indate', 'title' => 'Year' ],

        ];
    }

有人可以帮我怎么做吗？

Answer 1

您需要使用DB::raw函数来选择使用 Laravel Eloquent 的表达式。

例如：

return $model->newQuery()->...
->select(DB::raw('Month(details.indate) as Month'), DB::raw('Year(details.indate) as Year'), 'fishers.*','details.*', ...)

一定要添加use DB; 在文件的顶部。