如何在查询中为 eloquent 模型起别名

Posted 2023-03-14

【中文标题】如何在查询中为 eloquent 模型起别名

【英文标题】：How to alias eloquent models in a query

【发布时间】：2016-05-24 18:16:11

【问题描述】：

你如何给一个雄辩的模型起别名？例如，如果我有如下 SQL 查询：

SELECT one.name
     , one.id
     , one.name AS sortkey1
     , CAST(NULL AS UNSIGNED) AS sortkey2
     , CAST(NULL AS UNSIGNED) AS sortkey3
 FROM locations AS one
WHERE one.parent_id = 0
UNION ALL
....

在我的存储库中，我会有以下内容：

$first = $this->model->where('one.parent_id', '=', 0)
                     ->select('one.name'
                           , 'one.id'
                           , 'one.name AS sortkey1'
                           , DB::raw('CAST(NULL AS UNISIGNED) AS sortkey2')
                           , DB::raw('CAST(NULL AS UNISIGNED) AS sortkey3'));

那么，如何给模型起别名。在上面的示例中，模型映射了位置表，并且在我雄辩的查询中，我想将其别名为 one 而不是 locations

【参考方案1】：

你可以这样使用from：

$first = $this->model->from('locations as one')
                     ->where('one.parent_id', '=', 0)
                     ->select('one.name'
                           , 'one.id'
                           , 'one.name AS sortkey1'
                           , DB::raw('CAST(NULL AS UNISIGNED) AS sortkey2')
                           , DB::raw('CAST(NULL AS UNISIGNED) AS sortkey3'));