Laravel在引号内放入NULL

Question

我想与Laravel Eloquent进行联合查询。 当我们进行UNION查询时，两个查询中应有相同数量的选定列。 要跳过该规则，我想选择NULL作为Column_name， 但Laravel API会自动将NULL替换为'Null'，这会导致错误“ Null列不存在”。

如何从Null中删除这些自动添加的引号？

这就是我所拥有的： 第一个查询：

...->select("Calendars.*","Services.Id as IdService","Services.Name as ServiceName","NULL as Price")

第二个查询：

...->select("Calendars.*","Services.Id as IdService","Services.Name as ServiceName","PaidService.Price")

结果是：

...union (select `Calendars`.*, `Services`.`Id` as `IdService`, `Services`.`Name` as `ServiceName`, `NULL` as `Price` from `Calendars`

非常感谢！

Answer 1

为此考虑使用DB::raw。它将阻止laravel修改语句并按原样对其进行解析。

DB::raw("NULL as Price")

将进行第一个查询

...->select("Calendars.*",
            "Services.Id as IdService",
            "Services.Name as ServiceName",
            DB::raw("NULL as Price"))